History of metallurgy in China
Encyclopedia
Metallurgy
in China
has a long history. China was the earliest civilization that produced cast iron as well as chrome plated steel.
Although bronze artifacts were exhumed in the archeological sites of Majiayao culture
(2300 BC to 2700 BC), it is still commonly accepted that China
's Bronze Age began from around 2100 BC during the Xia dynasty
. The Erlitou culture
, Shang Dynasty
and Sanxingdui culture
of early China
used bronze vessels for rituals as well as farming implements and weapons. By 1200 BC, excellent bronzes were being made in China.
At the tomb of the first Qin Emperor and multiple Warring States period tombs, extremely sharp swords and other weapons were found which were coated with chromium
oxide, which made the weapons rust resistant. Chromium only came to the attention of westerners in the 18th century. The alloys of tin and copper enabled weapons such as bronze knives and swords to avoid rust and remain sharp in spite of 2000 years of degrading conditions. The layer of chromium oxide used on steel swords was 10 millimeters and left them in pristine condition to this day.
that date as early as the Zhou dynasty
of the 6th century BC. An Iron Age culture of the Tibetan Plateau
has tentatively been associated with the Zhang Zhung culture
described in early Tibetan writings. In 1972, near the city of Gaocheng
(藁城) in Shijiazhuang
(now Hebei
province), an iron-bladed bronze
hatchet (铁刃青铜钺) dating back to the 14th century BC was excavated. After a scientific examination, the iron was shown to be made from meteoric iron.
Around 500 BC, metalworkers in the southern state of Wu developed an iron smelting technology that would not be practiced in Europe until late medieval times. In Wu, iron smelters achieved a temperature of 1130°C, hot enough to be considered a blast furnace
. At this temperature, iron combines with 4.3% carbon and melts. As a liquid, iron can be cast
into mold
s, a method far less laborious than individually forging each piece of iron from a bloom.
If iron ores are heated with carbon to 1420–1470 K, a molten liquid is formed, an alloy
of about 96.5% iron and 3.5% carbon. This product is strong, can be cast into intricate shapes, but is too brittle to be worked, unless the product is decarburized to remove most of the carbon. The vast majority of Chinese iron manufacture, from the Zhou dynasty onward, was of cast iron. Iron, however, remained a pedestrian product, used by farmers for hundreds of years, and did not really affect the nobility of China until the Qin dynasty
(ca 22 ad).
Cast iron is rather brittle and unsuitable for striking implements. It can, however, be decarburized to steel or wrought iron by heating it in air for several days. In China, these ironworking methods spread northward, and by 300 BC
, iron was the material of choice throughout China for most tools and weapons. A mass grave in Hebei
province, dated to the early third century BC, contains several soldiers buried with their weapons and other equipment. The artifacts recovered from this grave are variously made of wrought iron, cast iron, malleabilized cast iron, and quench-hardened steel, with only a few, probably ornamental, bronze weapons.
During the Han Dynasty
(202 BC
–AD 220
), Chinese ironworking achieved a scale and sophistication not reached in the West until the eighteenth century. In the first century, the Han government established ironworking as a state monopoly and built a series of large blast furnaces in Henan
province, each capable of producing several tons of iron per day. By this time, Chinese metallurgists had discovered how to puddle molten pig iron, stirring it in the open air until it lost its carbon and became wrought iron. (In Chinese
, the process was called chao, literally, stir frying
.) Metal casting was spread westwards to the Dayuan
by Han deserters (Shiji, 123).
Also during this time, Chinese metallurgists had found that wrought iron and cast iron could be melted together to yield an alloy of intermediate carbon content, that is, steel. According to legend, the sword of Liu Bang, the first Han emperor, was made in this fashion. Some texts of the era mention "harmonizing the hard and the soft" in the context of ironworking; the phrase may refer to this process.
In the Korean Peninsula, iron objects were introduced through trade just before the Western Han Dynasty began (c. 300 BC). Iron ingots became an important mortuary item in Proto-historic Korea. Iron production quickly followed in the 2nd century BC, and iron implements came to be used by many farmers by the 1st century AD in Southern Korea.
under a cold blast
similar to the modern Bessemer process
Chinese metallurgy was widely practiced during the Middle Ages; during the 11th century, the growth of the iron industry caused vast deforestation
due to the use of charcoal
in the smelting process. To remedy the problem of deforestation, the Song Chinese discovered how to produce coke
from bituminous coal
as a substitute for charcoal. Although hydraulic-powered bellows
for heating the blast furnace
had been written about since Du Shi
's (d. 38) invention of them in the 1st century CE, the first known illustration of a bellows in operation is found in a book written in 1313 by Wang Zhen
(fl.
1290–1333).
the gold and silver smiths of Ningbo
were noted for the delicacy and tastefulness of their work.
Metallurgy
Metallurgy is a domain of materials science that studies the physical and chemical behavior of metallic elements, their intermetallic compounds, and their mixtures, which are called alloys. It is also the technology of metals: the way in which science is applied to their practical use...
in 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...
has a long history. China was the earliest civilization that produced cast iron as well as chrome plated steel.
Bronze and its Components
The use of copper in ancient China dates to at least back to 2000 BC., though it had to have been known earlier, because Bronzes that are older have already been found, and bronze cannot be made without copper. The reason for the lack of earlier evidence of copper is that it was both highly valuable and reusable, so early copper could have been recast as early bronze.Although bronze artifacts were exhumed in the archeological sites of Majiayao culture
Majiayao culture
The Majiayao culture is a name given by archaeologists to a group of Neolithic communities who lived primarily in the upper Yellow River region in eastern Gansu, eastern Qinghai and northern Sichuan, China. The culture existed from 3100 BC to 2700 BC...
(2300 BC to 2700 BC), it is still commonly accepted that 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...
's Bronze Age began from around 2100 BC during the Xia dynasty
Xia Dynasty
The Xia Dynasty is the first dynasty in China to be described in ancient historical chronicles such as Bamboo Annals, Classic of History and Records of the Grand Historian. The Xia Dynasty was established by the legendary Yu the Great after Shun, the last of the Five Emperors gave his throne to him...
. The Erlitou culture
Erlitou culture
The Erlitou culture is a name given by archaeologists to an Early Bronze Age urban society that existed in China from 2000 BCE to 1500 BCE. The culture was named after the site discovered at Erlitou in Yanshi, Henan Province...
, Shang Dynasty
Shang Dynasty
The Shang Dynasty or Yin Dynasty was, according to traditional sources, the second Chinese dynasty, after the Xia. They ruled in the northeastern regions of the area known as "China proper" in the Yellow River valley...
and Sanxingdui culture
Sanxingdui
Sanxingdui is the name of an archaeological site and its deduced culture in China, now believed to be the site of an ancient Chinese city. The previously unknown Bronze Age culture was re-discovered in 1987 when archaeologists excavated remarkable artifacts, that radiocarbon dating dated as being...
of early 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...
used bronze vessels for rituals as well as farming implements and weapons. By 1200 BC, excellent bronzes were being made in China.
At the tomb of the first Qin Emperor and multiple Warring States period tombs, extremely sharp swords and other weapons were found which were coated with chromium
Chromium
Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odorless, tasteless, and malleable...
oxide, which made the weapons rust resistant. Chromium only came to the attention of westerners in the 18th century. The alloys of tin and copper enabled weapons such as bronze knives and swords to avoid rust and remain sharp in spite of 2000 years of degrading conditions. The layer of chromium oxide used on steel swords was 10 millimeters and left them in pristine condition to this day.
Iron
Cast-iron artifacts are found in ChinaHistory of China
Chinese civilization originated in various regional centers along both the Yellow River and the Yangtze River valleys in the Neolithic era, but the Yellow River is said to be the Cradle of Chinese Civilization. With thousands of years of continuous history, China is one of the world's oldest...
that date as early as the Zhou dynasty
Zhou Dynasty
The Zhou Dynasty was a Chinese dynasty that followed the Shang Dynasty and preceded the Qin Dynasty. Although the Zhou Dynasty lasted longer than any other dynasty in Chinese history, the actual political and military control of China by the Ji family lasted only until 771 BC, a period known as...
of the 6th century BC. An Iron Age culture of the Tibetan Plateau
Tibetan Plateau
The Tibetan Plateau , also known as the Qinghai–Tibetan Plateau is a vast, elevated plateau in Central Asia covering most of the Tibet Autonomous Region and Qinghai, in addition to smaller portions of western Sichuan, southwestern Gansu, and northern Yunnan in Western China and Ladakh in...
has tentatively been associated with the Zhang Zhung culture
Zhang Zhung culture
Zhang Zhung, Shang Shung, or Tibetan Pinyin Xang Xung, was an ancient culture and kingdom of western and northwestern Tibet, which pre-dates the culture of Tibetan Buddhism in Tibet. Zhang Zhung culture is associated with the Bon religion, which in turn, has influenced the philosophies and...
described in early Tibetan writings. In 1972, near the city of Gaocheng
Gaocheng
Gaocheng is a county-level city belonging to Shijiazhuang, Hebei, China. The city has an area of 836 km² and a population of 743,000. It is located between and .-Administrative Divisions:There are 13 towns and 1 township.Towns:...
(藁城) in Shijiazhuang
Shijiazhuang
Shijiazhuang is the capital and largest city of North China's Hebei province. Administratively a prefecture-level city, it is about south of Beijing...
(now Hebei
Hebei
' is a province of the People's Republic of China in the North China region. Its one-character abbreviation is "" , named after Ji Province, a Han Dynasty province that included what is now southern Hebei...
province), an iron-bladed bronze
Bronze
Bronze is a metal alloy consisting primarily of copper, usually with tin as the main additive. It is hard and brittle, and it was particularly significant in antiquity, so much so that the Bronze Age was named after the metal...
hatchet (铁刃青铜钺) dating back to the 14th century BC was excavated. After a scientific examination, the iron was shown to be made from meteoric iron.
Around 500 BC, metalworkers in the southern state of Wu developed an iron smelting technology that would not be practiced in Europe until late medieval times. In Wu, iron smelters achieved a temperature of 1130°C, hot enough to be considered a blast furnace
Blast furnace
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally iron.In a blast furnace, fuel and ore and flux are continuously supplied through the top of the furnace, while air is blown into the bottom of the chamber, so that the chemical reactions...
. At this temperature, iron combines with 4.3% carbon and melts. As a liquid, iron can be cast
Casting
In metalworking, casting involves pouring liquid metal into a mold, which contains a hollow cavity of the desired shape, and then allowing it to cool and solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process...
into mold
Mold
Molds are fungi that grow in the form of multicellular filaments called hyphae. Molds are not considered to be microbes but microscopic fungi that grow as single cells called yeasts...
s, a method far less laborious than individually forging each piece of iron from a bloom.
If iron ores are heated with carbon to 1420–1470 K, a molten liquid is formed, an alloy
Alloy
An alloy is a mixture or metallic solid solution composed of two or more elements. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal history...
of about 96.5% iron and 3.5% carbon. This product is strong, can be cast into intricate shapes, but is too brittle to be worked, unless the product is decarburized to remove most of the carbon. The vast majority of Chinese iron manufacture, from the Zhou dynasty onward, was of cast iron. Iron, however, remained a pedestrian product, used by farmers for hundreds of years, and did not really affect the nobility of China until the Qin dynasty
Qin Dynasty
The Qin Dynasty was the first imperial dynasty of China, lasting from 221 to 207 BC. The Qin state derived its name from its heartland of Qin, in modern-day Shaanxi. The strength of the Qin state was greatly increased by the legalist reforms of Shang Yang in the 4th century BC, during the Warring...
(ca 22 ad).
Cast iron is rather brittle and unsuitable for striking implements. It can, however, be decarburized to steel or wrought iron by heating it in air for several days. In China, these ironworking methods spread northward, and by 300 BC
300 BC
Year 300 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Corvus and Pansa...
, iron was the material of choice throughout China for most tools and weapons. A mass grave in Hebei
Hebei
' is a province of the People's Republic of China in the North China region. Its one-character abbreviation is "" , named after Ji Province, a Han Dynasty province that included what is now southern Hebei...
province, dated to the early third century BC, contains several soldiers buried with their weapons and other equipment. The artifacts recovered from this grave are variously made of wrought iron, cast iron, malleabilized cast iron, and quench-hardened steel, with only a few, probably ornamental, bronze weapons.
During the Han Dynasty
Han Dynasty
The Han Dynasty was the second imperial dynasty of China, preceded by the Qin Dynasty and succeeded by the Three Kingdoms . It was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han. It was briefly interrupted by the Xin Dynasty of the former regent Wang Mang...
(202 BC
202 BC
Year 202 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Geminus and Nero...
–AD 220
220
Year 220 was a leap year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Antonius and Eutychianus...
), Chinese ironworking achieved a scale and sophistication not reached in the West until the eighteenth century. In the first century, the Han government established ironworking as a state monopoly and built a series of large blast furnaces in Henan
Henan
Henan , is a province of the People's Republic of China, located in the central part of the country. Its one-character abbreviation is "豫" , named after Yuzhou , a Han Dynasty state that included parts of Henan...
province, each capable of producing several tons of iron per day. By this time, Chinese metallurgists had discovered how to puddle molten pig iron, stirring it in the open air until it lost its carbon and became wrought iron. (In Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, the process was called chao, literally, stir frying
Stir frying
Stir frying is an umbrella term used to describe two Chinese cooking techniques for preparing food in a wok: chǎo and bào . The term stir-fry was introduced into the English language by Buwei Yang Chao, in her book How to Cook and Eat in Chinese, to describe the chǎo technique...
.) Metal casting was spread westwards to the Dayuan
Dayuan
The Dayuan or Ta-Yuan were a people of Ferghana in Central Asia, described in the Chinese historical works of Records of the Grand Historian and the Book of Han. It is mentioned in the accounts of the famous Chinese explorer Zhang Qian in 130 BCE and the numerous embassies that followed him into...
by Han deserters (Shiji, 123).
Also during this time, Chinese metallurgists had found that wrought iron and cast iron could be melted together to yield an alloy of intermediate carbon content, that is, steel. According to legend, the sword of Liu Bang, the first Han emperor, was made in this fashion. Some texts of the era mention "harmonizing the hard and the soft" in the context of ironworking; the phrase may refer to this process.
In the Korean Peninsula, iron objects were introduced through trade just before the Western Han Dynasty began (c. 300 BC). Iron ingots became an important mortuary item in Proto-historic Korea. Iron production quickly followed in the 2nd century BC, and iron implements came to be used by many farmers by the 1st century AD in Southern Korea.
Middle Ages
Shen Kuo's written work of 1088 contains, among other early descriptions of inventions, a method of repeated forging of cast ironCast iron
Cast iron is derived from pig iron, and while it usually refers to gray iron, it also identifies a large group of ferrous alloys which solidify with a eutectic. The color of a fractured surface can be used to identify an alloy. White cast iron is named after its white surface when fractured, due...
under a cold blast
Cold blast
Cold blast, in ironmaking, refers to a furnace where air is not preheated before being blown into the furnace. This represents the earliest stage in the development of ironmaking...
similar to the modern Bessemer process
Bessemer process
The Bessemer process was the first inexpensive industrial process for the mass-production of steel from molten pig iron. The process is named after its inventor, Henry Bessemer, who took out a patent on the process in 1855. The process was independently discovered in 1851 by William Kelly...
Chinese metallurgy was widely practiced during the Middle Ages; during the 11th century, the growth of the iron industry caused vast deforestation
Deforestation
Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a nonforest use. Examples of deforestation include conversion of forestland to farms, ranches, or urban use....
due to the use of charcoal
Charcoal
Charcoal is the dark grey residue consisting of carbon, and any remaining ash, obtained by removing water and other volatile constituents from animal and vegetation substances. Charcoal is usually produced by slow pyrolysis, the heating of wood or other substances in the absence of oxygen...
in the smelting process. To remedy the problem of deforestation, the Song Chinese discovered how to produce coke
Coke (fuel)
Coke is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. Cokes from coal are grey, hard, and porous. While coke can be formed naturally, the commonly used form is man-made.- History :...
from bituminous coal
Bituminous coal
Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal but of poorer quality than Anthracite...
as a substitute for charcoal. Although hydraulic-powered bellows
Bellows
A bellows is a device for delivering pressurized air in a controlled quantity to a controlled location.Basically, a bellows is a deformable container which has an outlet nozzle. When the volume of the bellows is decreased, the air escapes through the outlet...
for heating the blast furnace
Blast furnace
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally iron.In a blast furnace, fuel and ore and flux are continuously supplied through the top of the furnace, while air is blown into the bottom of the chamber, so that the chemical reactions...
had been written about since Du Shi
Du Shi
Du Shi was a Chinese governmental Prefect of Nanyang in 31 AD and a mechanical engineer of the Eastern Han Dynasty in ancient China. Du Shi is credited with being the first to apply hydraulic power to operate bellows in metallurgy...
's (d. 38) invention of them in the 1st century CE, the first known illustration of a bellows in operation is found in a book written in 1313 by Wang Zhen
Wang Zhen (official)
Wang Zhen was an official of the Yuan Dynasty of China. He is credited with the invention of the first wooden movable type printing in the world, while his predecessor of the Song Dynasty , Bi Sheng , invented the world's first earthenware movable type printing...
(fl.
Floruit
Floruit , abbreviated fl. , is a Latin verb meaning "flourished", denoting the period of time during which something was active...
1290–1333).
Gold and Silver
During the Qing dynastyQing Dynasty
The Qing Dynasty was the last dynasty of China, ruling from 1644 to 1912 with a brief, abortive restoration in 1917. It was preceded by the Ming Dynasty and followed by the Republic of China....
the gold and silver smiths of Ningbo
Ningbo
Ningbo is a seaport city of northeastern Zhejiang province, Eastern China. Holding sub-provincial administrative status, the municipality has a population of 7,605,700 inhabitants at the 2010 census whom 3,089,180 in the built up area made of 6 urban districts. It lies south of the Hangzhou Bay,...
were noted for the delicacy and tastefulness of their work.
See also
- Economy of the People's Republic of ChinaEconomy of the People's Republic of ChinaThe People's Republic of China ranks since 2010 as the world's second largest economy after the United States. It has been the world's fastest-growing major economy, with consistent growth rates of around 10% over the past 30 years. China is also the largest exporter and second largest importer of...
- Economic history of China (Pre-1911)
- Economic history of Modern ChinaEconomic history of modern ChinaThe economic history of modern China began with the fall of the Qing Dynasty in 1911. Following the Qing, China underwent a period of instability and disrupted economic activity. Under the Nanjing decade , China advanced several industries, in particular those related to the military, in an effort...