ISU-152
Encyclopedia
ISU-152 was a Soviet multirole fully enclosed and armored self-propelled gun
Self-propelled gun
A self-propelled gun is form of self-propelled artillery, and in modern use is usually used to refer to artillery pieces such as howitzers....

 developed and used during World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, with a subsequent use, mainly in the Soviet military, till the 1970s.

History

The ISU-152 marks its beginning on January 24, 1943. This was the moment of appearance of the first fighting vehicle of this family. It was designated Object 236 (Объект 236), using the same concept as the SU-152
SU-152
The SU-152 was a Soviet heavy self-propelled heavy howitzer used during World War II.It mounted a 152 mm gun-howitzer on the chassis of a KV-1S heavy tank. Later production used IS tank chassis and was re-designated as ISU-152...

. The Object 236 was completed in Factory No. 100 in Chelyabinsk
Chelyabinsk
Chelyabinsk is a city and the administrative center of Chelyabinsk Oblast, Russia, located in the northwestern side of the oblast, south of Yekaterinburg, just to the east of the Ural Mountains, on the Miass River. Population: -History:...

, and on the same day, January 24, underwent trials on the Chebarkulski artillery range, 107 km from Chelyabinsk. By February 7, 1943 the trials were over, passed with success. On February 14 the vehicle was adopted and put on production under the KV-14 (КВ-14) designation. In April 1943 was ordered KV-14 to be henceforth designated SU-152 (СУ-152). In time, the combat performance of SU-152, based on the KV-1S tank, made necessary the modernisation of the vehicle, using the new IS tank as a base. On May 25, 1943, shortly after deployment, the administration of Factory No. 100 ordered the beginning of the SU-152 modernization, which included an increase of the armor protection and other improvements. The development began in July 1943, under the supervision of Joseph Yakovlevich Kotin (the chief designer of Soviet heavy tanks) and G. N. Moskvin as the main designer, and in about a month the first modernized variant was ready. It was designated IS-152 (ИС-152). It underwent factory trials in September 1943, revealing a large number of different deficiencies, which sent it back for further improvement. In October 1943 a second (different) modernized variant was ready, designated Object 241 (Объект 241). It was an improvement over the IS-152. The factory trials began the same month, followed by state trials on the Gorohovetskom test range. On November 6, 1943, an order was issued for adoption of this variant, under the ISU-152 (ИСУ-152) designation, and in December its production began at the Chelyabinsk Kirovsk Plant, replacing the SU-152
SU-152
The SU-152 was a Soviet heavy self-propelled heavy howitzer used during World War II.It mounted a 152 mm gun-howitzer on the chassis of a KV-1S heavy tank. Later production used IS tank chassis and was re-designated as ISU-152...

.

Design

On April 15, 1942 at the plenum of the artillery committee, where it was suggested the development of assault gun
Assault gun
An assault gun is a gun or howitzer mounted on a motor vehicle or armored chassis, designed for use in the direct fire role in support of infantry when attacking other infantry or fortified positions....

s for support of the infantry, was acknowledged the necessity of also developing assault guns capable of destroying fortified positions. It was intended these assault guns to be armed with a 152.4 mm gun-howitzer and used for penetration of the enemy defense in the offensive operations planned for 1942-1943. This resulted in the development of the Object 236, and eventually the SU-152, which concept was later continued and further developed with the ISU-152.

The ISU-152 followed the same design as other Soviet self-propelled guns, except the SU-76
SU-76
The SU-76 was a Soviet self-propelled gun used during and after World War II.- History :The SU-76 was based on a lengthened and widened version of the T-70 tank chassis...

. The fully armoured hull was divided into two compartments: fighting compartment for the crew, gun and ammunition in the front of the hull, and engine and transmission in the rear. The gun was mounted slightly to the right of centre with a limited traverse of 12 degrees left and right. The crew consisted of 4 or 5 men placed in the superstructure. Three of the crew were to the left of the gun: driver to the front, then gunner and last the loader. The vehicle commander and lockman were to the right: commander to the front and the lockman behind. When the crew consisted of 4 men, the loading was carried out by the lockman.

The suspension consisted of twelve torsion bars for the six road wheels on either side. The drive sprockets were at the back, and the front idlers were identical to the road wheels. Each track was made up of 90 links. There were three internal fuel tanks, two in the crew area and one in the engine compartment. These were usually supplemented with four unconnected external fuel tanks. Twelve and 24-volt electrical power supplies came from a 1 kW generator feeding four accumulator
Accumulator (energy)
An accumulator is an apparatus by means of which energy can be stored, such as a rechargeable battery or a hydraulic accumulator. Such devices may be electrical, fluidic or mechanical and are sometimes used to convert a small continuous power source into a short surge of energy or vice versa...

 batteries.

For observation from the interior, all roof hatches had periscopes and there were two gun sights : telescopic ST-10 (СТ-10) and panoramic. For crew communication a TPU-4-BisF intercom was fitted, and for inter-vehicle communication there was a single 10R or 10RK radio. These were better than Soviet equipment at the start of the war but still inferior to German equipment.

The crew were given two PPSh
PPSh-41
The PPSh-41 was a Soviet submachine gun designed by Georgi Shpagin as an inexpensive, simplified alternative to the PPD-40. Intended for use by minimally-trained conscript soldiers, the PPSh was a magazine-fed selective-fire submachine gun using an open-bolt, blowback action...

 submachine guns with 1491 rounds and 20 F-1 grenades for short range self-defence.

The ISU-152 was armed with the same gun as the SU-152. It used the hull of the IS-1 tank instead of the KV-1S. Later in the war the ISU-152 was further improved. It used the hull of the IS-2 or IS-2 model 1944 tank, the armor of the mantlet was increased, the gun was replaced by newer variants, a 12.7 x 108 mm DShK
DShK
The DShK 1938 is a Soviet heavy machine gun firing the 12.7x108mm cartridge. The weapon was also used as a heavy infantry machine gun, in which case it was frequently deployed with a two-wheeled mounting and a single-sheet armour-plate shield...

 anti-aircraft machine gun was installed by the right forward hatch and later its ammunition capacity increased, the 10R radio set was upgraded to a 10RK and the fuel capacity was increased.

Some ISU-152s were equipped with even larger external fuel tanks, two tanks on the rear hull deck, in addition to the four external fuel tanks (90 liters each, maximum), or with two smaller additional external fuel tanks, on the hull rear. This option was probably available for the post-war ISU-152 variants.

Between December 1943 and May 1945, 1,885 ISU-152s were built. Mass production ceased in 1947, with 3,242 vehicles produced in total.

Post-war ISU-152 modernisation included installation of night vision sights, replacing of the V-2IS engine with the V-54K, the 12.7 machine gun was replaced by a newer variant, the ammunition capacity increased to 30 rounds, additional armor, automotive improvements and significant increase of the main fuel capacity.

ISU-152

The initial variant, developed in 1943. The factory designation was Object 241 (Объект 241). It was armed with the 152.4 mm ML-20S (МЛ-20С) gun-howitzer, with a barrel length of over 4.2 meters (27.9 calibers). The self-propelled gun carried 21 rounds of two piece (shell and charge) armor-piercing and high explosive ammunition. The gun had a maximum range of 6,200 meters. The armor-piercing round, weighing 48.78 kg, had a muzzle velocity of 600 m/s and a maximum penetration of 125 mm of RHA
Rolled homogeneous armour
Rolled homogeneous armour is a type of steel which is used to armour vehicles.-Composition:Armoured steel must be hard yet impervious to shock in order to resist high velocity metal projectiles. Steel with these characteristics is produced by processing cast steel billets of appropriate size and...

 at 90° at a range of 500 meters. The ISU-152 had different modifications concerning the gun (newer modifications), the number of the hatches, or the hull, based on the one of IS-1, IS-2 or IS-2 model 1944. The latter modification had a thicker gun shield, fuel tankage with increased volume etc. Till May 1944 the main armament was the 152.4 mm ML-20 model 1937 gun-howizer. ISU-152 had a rate of fire of 2-3 rounds/min. The early modifications had three hatches at the superstructure roof and one emergency hatch at the bottom of the hull behind the driver's seat, which had an armored cover. Later was added a fourth, round hatch, at the superstructure roof on the right, next to the rectangular hatch on the left. The later ISU-152 modifications, with newer gun and slightly longer barrel, up to over 4.9 meters (32.3 calibers), had a maximum range of fire of up to 13,000 meters.

ISU-152-2

One prototype, developed in 1944. In April 1944, in attempt to increase the firepower of ISU-152, a high-power variant of the self-propelled gun was developed in Factory No. 100, designated ISU-152BM (ИСУ-152БМ), sometimes referred to as ISU-152BM-1 or ISU-152-1. The factory designation was Object 246 (Объект 246). The "BM" ("БМ") in the designation stands for "Large Power" ("Большой Мощности"). The main purpose of the ISU-152BM was the fight against heavily armored tank destroyers such as the Elefant
Elefant
The Elefant was a "schwerer Panzerjäger" of the German Wehrmacht used in small numbers in World War II. It was built in 1943 under the name Ferdinand, after its designer Ferdinand Porsche. In 1944, after modification of the existing vehicles, they were renamed Elefant...

 and the Jagdtiger
Jagdtiger
Jagdtiger is the common name of a German tank destroyer of World War II. The official German designation was Panzerjäger Tiger Ausf. B. The ordnance inventory designation was Sd. Kfz. 186. It saw service in small numbers from late 1944 to the end of the war on both the Western and Eastern Front...

. It was armed with the 152.4 mm BL-8 (БЛ-8) long barrel gun, which unlike the ISU-152's gun wasn't a gun-howitzer. The gun had a maximum range of 18,500 meters, with the 43.56 kg high-explosive shell which had a muzzle velocity of 880 m/s. The overall length of the gun was over 8 meters, with a barrel length of 7620 mm (50 calibers). The armor-piercing round, weighing 48.78 kg, had a muzzle velocity of 850 m/s. During test firing at armor plates with different thickness, the ISU-152BM have successfully penetrated a maximum of 203 mm of RHA
Rolled homogeneous armour
Rolled homogeneous armour is a type of steel which is used to armour vehicles.-Composition:Armoured steel must be hard yet impervious to shock in order to resist high velocity metal projectiles. Steel with these characteristics is produced by processing cast steel billets of appropriate size and...

 at 90° at ranges of up to 2000 meters. However, during the trials, July 1944, the gun showed some deficiencies such as being difficult to operate by the crew, unreliable work of the muzzle brake and the breech block, and unsatisfactory performance of the shells. In addition, the gun, reaching out too far, was limiting the maneuverability of the fighting vehicle. The self-propelled gun carried 21 rounds of two piece (shell and charge) ammunition, and had a rate of fire of 2 rounds/min. It used the engine, transmission, running gear and electric equipment of the ISU-122
ISU-122
The ISU-122 was a Soviet self-propelled gun used during World War II.-History:A prototype of the ISU-122 heavy self-propelled gun was built at the Chelyabinsk Kirov Plant, , in December 1943...

. In August 1944 the BL-8 gun was replaced with the improved 152.4 mm BL-10 (БЛ-10) long barrel gun, with a slightly shorter barrel of 7392 mm (48.5 calibers). The self-propelled gun was designated ISU-152-2 (ИСУ-152-2). The factory designation was Object 247 (Объект 247). The fighting vehicle was also equipped with external fuel tanks. The gun had a modified muzzle brake and a semi-automatic breech block. It had a rate of fire of 3 rounds/min. The BL-10 had a maximum range of 18,000 meters, with the 43.56 kg high-explosive shell. In December 1944 the ISU-152-2 underwent trials, revealing the barrel strength and the angle of horizontal guidance were unsatisfactory. The gun was sent for further improvement, but it wasn't completed before the war ended. The fighting vehicle was never adopted. After the war, the final and most improved, third modification of ISU-152-2 was completed. The gun had a maximum range of 19,500 meters, using a 48.5 kg high-explosive shell with a muzzle velocity of 880 m/s.

ISU-152 model 1945

One prototype, developed in 1945. It used elements of the IS-2 and IS-3 tanks. The overall height of the vehicle was reduced to 2240 mm, which was compensated with an increased width of the superstructure. The factory designation was Object 704 (Объект 704). It was armed with the 152.4 mm ML-20SM model 1944 (МЛ-20СМ обр. 1944 г.) gun-howitzer, with a barrel length of over 4.5 meters (29.6 calibers) and no muzzle brake, which further increased the firepower of the gun. It had a maximum range of 13,000 meters. The self-propelled gun carried 20 rounds of two piece (shell and charge) armor-piercing and high explosive ammunition. The armor-piercing round, weighing 48.78 kg, had a muzzle velocity of 655 m/s. The rate of fire was 1-2 round/min. ISU-152 model 1945 had four hatches at the superstructure roof and one emergency hatch at the bottom of the hull behind the driver's seat, which had an armored cover. The self-propelled gun carried two external fuel tanks (90 liters each), not connected to the supply system. The secondary armament of the fighting vehicle consisted of two 12.7 x 108 mm DShK
DShK
The DShK 1938 is a Soviet heavy machine gun firing the 12.7x108mm cartridge. The weapon was also used as a heavy infantry machine gun, in which case it was frequently deployed with a two-wheeled mounting and a single-sheet armour-plate shield...

 machine guns, one anti-aircraft and one co-axial. The protection was increased by placing thicker armor at more radical angles. In the area of the gun, where the mantlet combined with the hull front behind it and the housing of the recoil mechanism, the armor thickness was 320 mm. ISU-152 model 1945 (ИСУ-152 обр. 1945 г.) was the best protected of all experimental or production Soviet self-propelled gun
Self-propelled gun
A self-propelled gun is form of self-propelled artillery, and in modern use is usually used to refer to artillery pieces such as howitzers....

s of the Second World War. However, the radical incline of the superstructure walls combined with the increased recoil of the gun, due to the lack of a muzzle brake, significantly complicated the work of the crew, and for this reason mainly wasn't adopted.

ISU-152K

A modernised variant of the wartime ISU-152 was developed in 1953. It used a new engine, that of the T-54, with a cooling system and a heater. The capacity of the main internal fuel tank was increased to 920 liters, which added 500 km more to the vehicle range on a road. The ammunition capacity was increased to 30 rounds after the removal of an additional internal fuel tank placed in the crew compartment. The gun had a maximum range of 13,000 meters. It received a new commander's cupola, and also new sights. The factory designation was Object 241K (Объект 241К). The running gear used many elements of the T-10. The mantlet had additional armor ring protecting the sight. Some of the ISU-152Ks received an additional 15 mm armor plate welded on top of the 60 mm armor plate covering the mantlet above. Also, some of them received an additional armor plate welded on the upper mantlet front. The modernisation was carried out in the Leningrad Kirov Plant
Kirov Plant
The Kirov Plant Kirov Factory or Leningrad Kirov Plant is a major Russian machine-building plant in St. Petersburg, Russia....

.

ISU-152M

The final variant, a modernised former ISU-152, was developed in 1959. The work was now transferred to the Chelyabinsk Kirovsk Plant. This modernisation was parallel to the IS-2M program and the ISU-152M used many elements of the tank. The factory designation was Object 241M (Объект 241М). The innovations included the installing of night vision sights, increased ammunition stowage for the 12.7 mm machine gun, which was replaced by the improved DShKM, and internal automotive improvements. It had the same new commander's cupola and sights as the ISU-152K. It also had the same main internal fuel tank capacity, 920 liters, adding 500 km more to the vehicle range on a road compared to the ISU-152, and an increased ammunition capacity to 30 rounds due to the removal of an additional internal fuel tank. The gun had a maximum range of 13,000 meters. The ring protecting the sight was present, and the armor of the upper mantlet front was further increased with a thicker additional armor plate. The ISU-152M had the same V-54K engine with a heater, but lacked the cooling system.

Multirole use

The ISU-152 self-propelled gun
Self-propelled gun
A self-propelled gun is form of self-propelled artillery, and in modern use is usually used to refer to artillery pieces such as howitzers....

 combined three battle roles : heavy assault gun
Assault gun
An assault gun is a gun or howitzer mounted on a motor vehicle or armored chassis, designed for use in the direct fire role in support of infantry when attacking other infantry or fortified positions....

, heavy tank destroyer
Tank destroyer
A tank destroyer is a type of armored fighting vehicle armed with a gun or missile launcher, and is designed specifically to engage enemy armored vehicles...

 and heavy self-propelled artillery
Self-propelled artillery
Self-propelled artillery vehicles are combat vehicles armed with artillery. Within the term are covered self-propelled guns and rocket artillery...

. The 152.4 mm gun used a number of powerful (shell and charge) ammunition. Some of these ammunition had a 43.56 kg high-explosive shell, or a 48.78 kg armor-piercing shell, or the heaviest of all, the 53-G-545 (53-Г-545) long range concrete-piercing ammunition with a 56 kg shell. The ISU-152 was used for infantry and tank support, and attack on fortified positions in a direct fire role, for support on the battlefield in an indirect fire role, and for fight against tanks with a direct fire.

Heavy assault gun

As a heavy assault gun, the ISU-152 was an extremely valuable weapon in urban combat operations such as the assaults on Berlin
Berlin
Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

, Budapest
Budapest
Budapest is the capital of Hungary. As the largest city of Hungary, it is the country's principal political, cultural, commercial, industrial, and transportation centre. In 2011, Budapest had 1,733,685 inhabitants, down from its 1989 peak of 2,113,645 due to suburbanization. The Budapest Commuter...

 and Königsberg
Königsberg
Königsberg was the capital of East Prussia from the Late Middle Ages until 1945 as well as the northernmost and easternmost German city with 286,666 inhabitants . Due to the multicultural society in and around the city, there are several local names for it...

. The vehicle's excellent armour protection finally provided the 152.4 mm platform with good protection from most German anti-tank guns, allowing it to advance into the face of direct anti-tank fire, while the huge low velocity high-explosive rounds were excellent at blasting open even the most heavily fortified and reinforced enemy strongpoints. Such actions would be much more dangerous and much less effective for a conventional towed artillery piece, with their high crew exposure and low mobility, or even a tank, with their smaller main guns. When supporting tanks, the usual tactics of the ISU-152 were to be used in the second line of the attack order, 100 to 200 meters behind the attacking tanks, which were usually IS
Iosif Stalin tank
The Iosif Stalin tank , was a heavy tank developed by the Soviet Union during World War II and first used in the Kursk area in September 1943...

 tanks with equal mobility.

The ISU-152, like the earlier SU-152
SU-152
The SU-152 was a Soviet heavy self-propelled heavy howitzer used during World War II.It mounted a 152 mm gun-howitzer on the chassis of a KV-1S heavy tank. Later production used IS tank chassis and was re-designated as ISU-152...

 and contemporary ISU-122
ISU-122
The ISU-122 was a Soviet self-propelled gun used during World War II.-History:A prototype of the ISU-122 heavy self-propelled gun was built at the Chelyabinsk Kirov Plant, , in December 1943...

, was employed by Independent Heavy Self-propelled Artillery Regiments. Between May 1943 and 1945, 53 of these regiments were formed. Many of them were re-formed tank regiments, and employed similar direct fire tactics as used by tanks when supporting infantry. Each of the heavy regiment had 21 guns, divided into 4 artillery batteries of 5 vehicles and the commander's vehicle. For support the heavy regiments had some supplementary unarmoured vehicles such as trucks, jeeps, or motorcycles. In December 1944, Guards Heavy Self-propelled Artillery Brigades were formed, to provide heavy fire support to the tank armies. They were organized along the model of tank brigades, each with 65 ISU-152 or ISU-122 self-propelled guns.

To minimize the risks of being knocked out by Panzerfaust
Panzerfaust
The Panzerfaust was an inexpensive, recoilless German anti-tank weapon of World War II. It consisted of a small, disposable preloaded launch tube firing a high explosive anti-tank warhead, operated by a single soldier...

-equipped units during urban operations, the ISU-152 usually acted in one or two vehicle detachments alongside infantry squads for protection. The infantry squad would include a specialist sniper
Sniper
A sniper is a marksman who shoots targets from concealed positions or distances exceeding the capabilities of regular personnel. Snipers typically have specialized training and distinct high-precision rifles....

 (or at least a sharpshooter), some submachine gunners and sometimes a flamethrower
Flamethrower
A flamethrower is a mechanical device designed to project a long controllable stream of fire.Some flamethrowers project a stream of ignited flammable liquid; some project a long gas flame. Most military flamethrowers use liquids, but commercial flamethrowers tend to use high-pressure propane and...

. The ISU-152's heavy calibre DShK
DShK
The DShK 1938 is a Soviet heavy machine gun firing the 12.7x108mm cartridge. The weapon was also used as a heavy infantry machine gun, in which case it was frequently deployed with a two-wheeled mounting and a single-sheet armour-plate shield...

 machinegun was also useful for targeting Panzerfaust gunners hiding on upper floors of city buildings or behind protective cover, barricades, etc. Effective teamwork between the ISU-152 crew and supporting infantry allowed them to achieve their goals with minimal losses, but if such tactics were not adhered to, the attacking vehicles were easily attacked and destroyed, usually through the weaker armor on the roof or rear compartment.

Heavy tank destroyer

The ISU-152 could also operate as an effective heavy tank destroyer. Though it was not designed for the role, the vehicle inherited the nickname Zveroboy ("beast killer") from its predecessor, the SU-152, for its rare ability to reliably kill the best protected German fighting vehicles, the Panther
Panther tank
Panther is the common name of a medium tank fielded by Nazi Germany in World War II that served from mid-1943 to the end of the European war in 1945. It was intended as a counter to the T-34, and to replace the Panzer III and Panzer IV; while never replacing the latter, it served alongside it as...

 tank, the Tiger
Tiger I
Tiger I is the common name of a German heavy tank developed in 1942 and used in World War II. The final official German designation was Panzerkampfwagen Tiger Ausf. E, often shortened to Tiger. It was an answer to the unexpectedly formidable Soviet armour encountered in the initial months of...

 and Tiger B
Tiger II
Tiger II is the common name of a German heavy tank of the Second World War. The final official German designation was Panzerkampfwagen Tiger Ausf. B,Panzerkampfwagen – abbr: Pz. or Pz.Kfw. Ausführung – abbr: Ausf. .The full titles Panzerkampfwagen Tiger Ausf...

 tanks, and even the Elefant
Elefant
The Elefant was a "schwerer Panzerjäger" of the German Wehrmacht used in small numbers in World War II. It was built in 1943 under the name Ferdinand, after its designer Ferdinand Porsche. In 1944, after modification of the existing vehicles, they were renamed Elefant...

 and Jagdtiger
Jagdtiger
Jagdtiger is the common name of a German tank destroyer of World War II. The official German designation was Panzerjäger Tiger Ausf. B. The ordnance inventory designation was Sd. Kfz. 186. It saw service in small numbers from late 1944 to the end of the war on both the Western and Eastern Front...

 tank destroyers. The sheer weight of the 152.4 mm shells resulted in an extremely low rate of fire, only one to three rounds per minute, and were not as accurate at long range as high-velocity antitank guns. However, the massive blast effect from the heavy high-explosive warhead was capable of blowing the turret completely off a Tiger tank. A direct hit usually destroyed or damaged the target's tracks and suspension, immobilizing it. While the low-velocity 152mm shell did not generally penetrate heavy armor, it frequently killed or severely wounded the crew through spalling (splintering) inside the hull as well as injuries caused by blast concussion. Surviving crew were often left with an immobilized vehicle which had to be hurriedly abandoned before being destroyed. For anti-tank operations following the Battle of Kursk
Battle of Kursk
The Battle of Kursk took place when German and Soviet forces confronted each other on the Eastern Front during World War II in the vicinity of the city of Kursk, in the Soviet Union in July and August 1943. It remains both the largest series of armored clashes, including the Battle of Prokhorovka,...

, armour-piercing ammunition was developed, with an eye towards giving the howitzer a more traditional anti-tank capability. However, these rounds were expensive, in short supply, and only moderately more effective than the standard non-penetrating high-explosive round. As a howitzer the ML-20S exchanged velocity and accuracy for throw weight and distance, and was not intended to compete with true anti-tank guns. Sometimes the concrete-piercing ammunition was used for the anti-tank role. A primitive shaped charge
Shaped charge
A shaped charge is an explosive charge shaped to focus the effect of the explosive's energy. Various types are used to cut and form metal, to initiate nuclear weapons, to penetrate armor, and in the oil and gas industry...

 ammunition, with a 27.44 kg shell, was also developed. It had a maximum penetration of 250 mm of RHA
Rolled homogeneous armour
Rolled homogeneous armour is a type of steel which is used to armour vehicles.-Composition:Armoured steel must be hard yet impervious to shock in order to resist high velocity metal projectiles. Steel with these characteristics is produced by processing cast steel billets of appropriate size and...

 at 90°, but it was not used during the war.

The ISU-152's 90 mm of sloped frontal armor, in contrast to the SU-152's 65 mm, provided excellent frontal protection from the 75mm KwK 40 gun of the ubiquitous Panzer IV
Panzer IV
The Panzerkampfwagen IV , commonly known as the Panzer IV, was a medium tank developed in Nazi Germany in the late 1930s and used extensively during the Second World War. Its ordnance inventory designation was Sd.Kfz...

 and StuG family at all but the closest ranges, while also forcing the original Tiger I, with its vaunted 88mm KwK 36 gun, to close to medium ranges in order to successfully penetrate the vehicle, negating its traditional long range superiority and exposing more of its vulnerable flanks to the 85mm ZiS-S gun of the Soviet T-34-85.

The ISU-152 was not a true purpose-built tank destroyer. It had a very low rate of fire compared with specialised tank destroyers such as the German Jagdpanther
Jagdpanther
The Jagdpanther was a tank destroyer built by Nazi Germany during World War II based on the chassis of the Panther tank. It entered service late in the war and saw service on the Eastern and Western fronts...

 or the Soviet SU-100
SU-100
The SU-100 was a Soviet tank destroyer. It was used extensively during the last year of World War II and saw service for many years afterwards with the armies of Soviet allies around the world.- Development :...

, which could manage a brief burst of 5-8 rounds per minute. However, prior to the introduction of the SU-100 it was the only Soviet armored vehicle capable of tackling the German heavy tanks with any kind of reliability, and its ability to satisfy multiple roles meant it was produced in far greater numbers than the SU-100. Attention to camouflage, quick relocation between firing positions, and massed ambushes of 4-5 vehicles firing in salvo at a single target's flanks reduced the disadvantage of the low rate of fire. Using these tactics, the ISU-152 became greatly feared by German heavy tank commanders, robbing them of their prior sense of invulnerability to Soviet guns and forcing them to commit their forces more cautiously and sparingly.

Heavy self-propelled artillery

The ISU-152 was also sometimes used as a self-propelled artillery for support on the battlefield and preparatory bombardments, though it had a medium range of fire and a slow speed of reloading. The Soviet army had not developed specialized vehicles for this purpose. Their tank and mechanized units were well equipped with towed artillery, but the towed guns were very vulnerable while moving and they could not support tanks and motorized infantry during rapid advances into enemy positions, especially when they lack the armored fully enclosed design of the fighting vehicles like ISU-152.

Despite the ISU-152's good features it suffered in some other areas. The greatest disadvantage was that the internal stowage was limited to only 20 or 21 rounds of ammunition, with extra rounds often stowed on the rear deck. Replenishing the vehicle's ammunition supply took over 40 minutes and required a very strong loader, due to the large size and weight of the shells. The ST-10 telescopic sight used for direct fire was graduated up to 900 metres. A second, panoramic, sight was used for direct fire up to 3,500 meter range. However, it was problematic for the gunner to switch between the two visors. To compensate it was simpler to concentrate the fire of several vehicles onto the target, sacrificing accuracy for sheer volume of firepower. The high-explosive shells were large enough to take out even a heavily armoured vehicle, or a fortification with the even heavier long range concrete-piercing shells. The usual complement of ammunition was 13 high-explosive and 7 armour-piercing or concrete-piercing.
Ammunition Ammunition type Shell type Shell weight Penetration (maximum) (1000 meters) (1500 meters) (2000 meters)
53-OF-540
(still in use)
Long-range high-explosive gun steel shell 43.56 kg
53-OF-530 Long-range high-explosive howitzer steel shell 40 kg
53-BR-540 Armor-piercing pointed nose shell
(without a ballistic cap)
48.78 kg 125 mm of RHA at 90°
(at 500 meters)
115 mm
(123 mm)
105 mm 90 mm
53-BR-540B
(adopted in late 1944)
Armor-piercing flat nose shell
(with a ballistic cap)
46.5 kg 130 mm of RHA at 90°
(at 500 meters)
120 mm 115 mm 105 mm
53-BP-540
(not used during the war)
Armor-piercing shaped charge 27.44 kg 250 mm of RHA at 90°
(220 mm at 30° from vertical)
(120 mm at 60° from vertical)
(naval, model 1915/1928) Semi-armor-piercing 51.07 kg 136 mm of RHA at 90°
(at 100 meters)
(128 mm at 500 meters)
119 mm 111 mm 105 mm
53-G-530 Long range concrete-piercing howitzer shell 40 kg about 1 meter of reinforced concrete
53-G-545 Long range concrete-piercing gun shell 56 kg

The armor penetration can vary with the different ammunition batches or the different RHA
Rolled homogeneous armour
Rolled homogeneous armour is a type of steel which is used to armour vehicles.-Composition:Armoured steel must be hard yet impervious to shock in order to resist high velocity metal projectiles. Steel with these characteristics is produced by processing cast steel billets of appropriate size and...

.

  • The use of ISU-152 in the post-World War II years was mainly as an assault gun. By the late 1950s the soviets had already developed 152.4 mm nuclear rounds, capable of being used by the ISU-152 in the role of a self-propelled artillery, but the low angle of inclination and short maximum range of the gun made it dangerous for the fighting vehicles themselves. The soviets tried to solve this problem by developing rocket assisted projectiles
    Rocket Assisted Projectile
    A Rocket Assisted Projectile is an artillery or cannon round incorporating a rocket motor for independent propulsion. This grants the projectile both greater speed and range than an ordinary shell, which is propelled only by the ballistic force of the gun's exploding charge...

    , but this solution was later abandoned in favor of the SO-152 (СО-152) self-propelled artillery of a new type, developed in 1968. After the adoption of SO-152, the last remaining role of the ISU-152, as a conventional or nuclear self-propelled artillery, was over.

Soviet combat use

  • World War II
    World War II
    World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

    • Eastern Front
      Eastern Front (World War II)
      The Eastern Front of World War II was a theatre of World War II between the European Axis powers and co-belligerent Finland against the Soviet Union, Poland, and some other Allies which encompassed Northern, Southern and Eastern Europe from 22 June 1941 to 9 May 1945...

      • Continuation War
        Continuation War
        The Continuation War was the second of two wars fought between Finland and the Soviet Union during World War II.At the time of the war, the Finnish side used the name to make clear its perceived relationship to the preceding Winter War...

    • Soviet–Japanese War
      • Manchurian Invasion
  • Hungarian Revolution

Finnish military

In June 1944, during the Continuation War
Continuation War
The Continuation War was the second of two wars fought between Finland and the Soviet Union during World War II.At the time of the war, the Finnish side used the name to make clear its perceived relationship to the preceding Winter War...

, a captured ISU-152 was used by the Finnish military
Finnish Army
The Finnish Army is the land forces branch of the Finnish Defence Forces.Today's Army is divided into six branches: the infantry , field artillery, anti-aircraft artillery, engineers, signals, and materiel troops.-History of the Finnish Army:Between 1809 and 1917 Finland was an autonomous part of...

. It was lost in the fights. Another one was repaired in Varkaus
Varkaus
Varkaus is a Middle-Savonian industrial town and municipality of Finland.It is located in the province of Eastern Finland and is part of the Northern Savonia region. The municipality has a population of and covers an area of of which is water. The population density is .The municipality is...

, Finland
Finland
Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...

, but never saw action.

Polish military

In 1944 over 30 ISU-152s were delivered to the People's Army of Poland. Shortly after, the Poles formed the 25th Polish self-propelled artilery regiment, consisting of 10 ISU-152s and 22 ISU-122
ISU-122
The ISU-122 was a Soviet self-propelled gun used during World War II.-History:A prototype of the ISU-122 heavy self-propelled gun was built at the Chelyabinsk Kirov Plant, , in December 1943...

s. As part of the 1st Polish tank corps (T-34
T-34
The T-34 was a Soviet medium tank produced from 1940 to 1958. Although its armour and armament were surpassed by later tanks of the era, it has been often credited as the most effective, efficient and influential design of World War II...

 and T-34-85 tanks), the regiment took part in the fights on the river Nysa, southwest of Poland
Poland
Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 in March 1945. In the early 1945 the Polish command began to form another ISU-152 regiment, but with not enough of these fighting vehicles, the newly formed 13th Polish self-propelled artillery regiment received two ISU-152 and two SU-85
SU-85
The SU-85 was a Soviet self-propelled gun used during World War II, based on the chassis of the T-34 medium tank. Earlier Soviet self-propelled guns were meant to serve as either assault guns, such as the SU-122, or as mobile anti-tank weapons; the SU-85 fell into the latter category...

 artillery batteries. This regiment took part in the Battle of Berlin
Battle of Berlin
The Battle of Berlin, designated the Berlin Strategic Offensive Operation by the Soviet Union, was the final major offensive of the European Theatre of World War II....

 in April - May 1945.

During the post-war period the ISU-152s remained in the Polish military
Polish Armed Forces
Siły Zbrojne Rzeczypospolitej Polskiej are the national defense forces of Poland...

 till the early 1960s.

Chinese military

In 1955 the Soviet Armed Forces
Soviet Armed Forces
The Soviet Armed Forces, also called the Armed Forces of the Union of Soviet Socialist Republics and Armed Forces of the Soviet Union refers to the armed forces of the Russian SFSR , and Soviet Union from their beginnings in the...

 retreated from Dalian
Dalian
Dalian is a major city and seaport in the south of Liaoning province, Northeast China. It faces Shandong to the south, the Yellow Sea to the east and the Bohai Sea to the west and south. Holding sub-provincial administrative status, Dalian is the southernmost city of Northeast China and China's...

, China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

 ending 10 years residence. All armament was sold to the People's Liberation Army
People's Liberation Army
The People's Liberation Army is the unified military organization of all land, sea, strategic missile and air forces of the People's Republic of China. The PLA was established on August 1, 1927 — celebrated annually as "PLA Day" — as the military arm of the Communist Party of China...

, including 67 ISU-152s, 45 of which were given the new founding 1st Mechanical Division.

Czechoslovakian military

As part of the military help to the friendly countries, a few ISU-152s were transferred to the Czechoslovakian military after the World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, where they were used till the late 1950s.

North Korean military

During the Korean War
Korean War
The Korean War was a conventional war between South Korea, supported by the United Nations, and North Korea, supported by the People's Republic of China , with military material aid from the Soviet Union...

, ISU-152s were used by the North Korean military
Korean People's Army
The Korean People's Army , also known as the Inmin Gun, are the military forces of the Democratic People's Republic of Korea. Kim Jong-il is the Supreme Commander of the Korean People's Army and Chairman of the National Defence Commission...

.

Egyptian military

In the early 1960s the Egyptian military received at least one regiment of ISU-152s. They were used during the 1967-1973 Egyptian–Israeli Wars
Arab–Israeli conflict
The Arab–Israeli conflict refers to political tensions and open hostilities between the Arab peoples and the Jewish community of the Middle East. The modern Arab-Israeli conflict began with the rise of Zionism and Arab Nationalism towards the end of the nineteenth century, and intensified with the...

.

Remnants

Today what's left to remind of ISU-152 can be seen, exhibited or simply located, at different museums and memorials around the world, or even as a monument, a remnant of a restless past sealed in time.
  • Military Historical Museum of Artillery, Engineers and Signal Corps
    Military Historical Museum of Artillery, Engineers and Signal Corps
    The Military Historical Museum of Artillery, Engineers and Signal Corps , also known simply as the Artillery Museum, is a state-owned military museum in Saint Petersburg, Russia...

    , Saint Petersburg
    Saint Petersburg
    Saint Petersburg is a city and a federal subject of Russia located on the Neva River at the head of the Gulf of Finland on the Baltic Sea...

    , Russia
    Russia
    Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

  • Central Museum of Armed Forces
    Central Armed Forces Museum
    The Central Armed Forces Museum also known as the Museum of the Soviet Army, is located in northern Moscow near the Red Army Theater.-History:...

    , Moscow
    Moscow
    Moscow is the capital, the most populous city, and the most populous federal subject of Russia. The city is a major political, economic, cultural, scientific, religious, financial, educational, and transportation centre of Russia and the continent...

    , Russia
  • Military Historical Museum of Armored Fighting Vehicles and Equipment in Kubinka
    Kubinka Tank Museum
    The Kubinka Tank Museum is a large museum of armoured fighting vehicles in Kubinka, just outside Moscow. It has many famous tanks from World War I, World War II and the Cold War. The museum also houses many unique vehicles, such as the Panzer VIII Maus, Troyanov super-heavy tank and a Karl-Gerät...

    , Kubinka
    Kubinka
    Kubinka is a town in Odintsovsky District of Moscow Oblast, Russia, located on the Setun River, west of Moscow. Population: Kubinka was the location of the Soviet Union's tank proving grounds, and today is the home of the Kubinka Tank Museum...

    , Russia
  • Sapun Mountain Memorial, Sevastopol
    Sevastopol
    Sevastopol is a city on rights of administrative division of Ukraine, located on the Black Sea coast of the Crimea peninsula. It has a population of 342,451 . Sevastopol is the second largest port in Ukraine, after the Port of Odessa....

    , Ukraine
    Ukraine
    Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...

  • National Museum of the History of the Great Patriotic War 1941-1945
    Museum of the Great Patriotic War, Kiev
    The National Museum of the History of the Great Patriotic War is a memorial complex commemorating the German-Soviet War located in the southern outskirts of the Pechersk district of Kiev, the capital of Ukraine, on the picturesque hills on the right-bank of the Dnieper River.The museum has moved...

    , Kiev
    Kiev
    Kiev or Kyiv is the capital and the largest city of Ukraine, located in the north central part of the country on the Dnieper River. The population as of the 2001 census was 2,611,300. However, higher numbers have been cited in the press....

    , Ukraine
  • Museum of the Polish Army
    Polish Army Museum
    -Newest Exhibition:The Polish Army Museum was not too long ago given the equipment of the lost soldiers from the Presidential Smolensk aircraft crash. The equipment includes the ID Passes, Portable radios, torches, holsters and much more and all in their original state.Museum of the Polish Army is...

    , Warsaw
    Warsaw
    Warsaw is the capital and largest city of Poland. It is located on the Vistula River, roughly from the Baltic Sea and from the Carpathian Mountains. Its population in 2010 was estimated at 1,716,855 residents with a greater metropolitan area of 2,631,902 residents, making Warsaw the 10th most...

    , Poland
    Poland
    Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

  • The Armored Corps Memorial Site and Museum at Latrun
    Yad La-Shiryon
    Yad La-Shiryon is Israel's official memorial site for fallen soldiers from the armored corps, as well as one of the most diverse tank museums in the world. The cornerstone for Yad La-Shiryon was laid on...

    , Latrun
    Latrun
    Latrun is a strategic hilltop in the Ayalon Valley in Israel overlooking the road to Jerusalem. It is located 25 kilometers west of Jerusalem and 14 kilometers southeast of Ramla.-Etymology:...

    , Israel
    Israel
    The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...

  • Stalin Line Museum, Minsk
    Minsk
    - Ecological situation :The ecological situation is monitored by Republican Center of Radioactive and Environmental Control .During 2003–2008 the overall weight of contaminants increased from 186,000 to 247,400 tons. The change of gas as industrial fuel to mazut for financial reasons has worsened...

    , Belarus
    Belarus
    Belarus , officially the Republic of Belarus, is a landlocked country in Eastern Europe, bordered clockwise by Russia to the northeast, Ukraine to the south, Poland to the west, and Lithuania and Latvia to the northwest. Its capital is Minsk; other major cities include Brest, Grodno , Gomel ,...

  • Belarusian State Museum of Great Patriotic War History, Minsk, Belarus
  • Parola Armor Museum
    Parola Tank Museum
    Parola Tank Museum, officially Armoured Vehicle Museum is a military museum located in Parola, near Hämeenlinna, in Finland. It displays various tanks, armoured vehicles and anti-tank guns used by the Finnish Defence Forces throughout its history. A rare exhibit is an armoured train used in...

    , Parola
    Parola
    Parola is a town in the municipality of Hattula in Finland. It is located 110 kilometres north of Helsinki. Cities nearby include Hämeenlinna, Tampere, Lahti and Forssa....

    , Finland
    Finland
    Finland , officially the Republic of Finland, is a Nordic country situated in the Fennoscandian region of Northern Europe. It is bordered by Sweden in the west, Norway in the north and Russia in the east, while Estonia lies to its south across the Gulf of Finland.Around 5.4 million people reside...

  • German-Russian Museum Berlin-Karlshorst
    German-Russian Museum Berlin-Karlshorst
    The German-Russian Museum Berlin-Karlshorst is dedicated to German-Soviet and German-Russian relations with a focus on the German-Soviet war 1941-1945.- The museum building :...

    , Karlshorst
    Karlshorst
    Karlshorst is a locality in the borough of Lichtenberg in Berlin. It houses a harness racing track and the Hochschule für Technik und Wirtschaft Berlin , the largest University of Applied Sciences in Berlin, and the German-Russian Museum Berlin-Karlshorst.-History:Established in 1895 as the...

    , Berlin
    Berlin
    Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

    , Germany
    Germany
    Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

  • Victory Park Memorial, Saratov
    Saratov
    -Modern Saratov:The Saratov region is highly industrialized, due in part to the rich in natural and industrial resources of the area. The region is also one of the more important and largest cultural and scientific centres in Russia...

    , Russia
  • Victory Park Memorial
    Poklonnaya Hill
    Poklonnaya Gora is, at 171.5 metres, one of the highest spots in Moscow. Its two summits used to be separated by the Setun River, until one of the summits was razed in 1987...

    , Moscow, Russia
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