History of Steel Manufacturing50 milestones · 168 developments

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An interactive timeline of the history of steel manufacturing: 50 milestones · 168 developments, from Ancient & Medieval to Global & Green, with the connections between them.

Ancient & Medieval

Anatolian & Hittite Ironworking (c. 1800–1200 BCE)

Some of the earliest deliberately smelted iron, including carburised fragments, comes from Bronze Age Anatolia. Under the Hittites iron was a prestige metal traded as diplomatic gifts before its use spread widely after the Late Bronze Age collapse.

Bloomery Smelting (c. 1200 BCE onward)

The bloomery reduced iron ore with charcoal below iron’s melting point, yielding a spongy “bloom” of iron and slag. Smiths hammered the bloom into wrought iron and could harden it by carburising and quenching.

Chinese Cast Iron (c. 5th century BCE)

By the Warring States period Chinese ironmakers ran early blast furnaces that produced liquid cast iron, centuries before Europe. Phosphorus-rich ores and efficient bellows helped lower melting points and raise furnace temperatures.

Indian Wootz Steel (c. 300 BCE onward)

Wootz was a high-carbon crucible steel made in southern India and Sri Lanka by melting iron with carbonaceous material in sealed clay crucibles. Its ingots were traded across the Indian Ocean and Middle East for centuries.

Chinese Fining & Co-fusion Steel (2nd c. BCE – 11th c. CE)

Han-dynasty smiths decarburised cast iron by stirring it in air, an early fining process known as chaogang. Later co-fusion methods blended cast and wrought iron, and Song-dynasty China reached iron output not matched in Europe until the industrial age.

Noric Steel (c. 1st century BCE)

Noricum, in present-day Austria, exported steel prized by the Roman army. Manganese-rich ores from deposits such as the Erzberg favoured steel formation in bloomeries.

Ulfberht Swords (c. 800–1000 CE)

About 170 Viking-age swords bear the inscription +VLFBERH+T. Some are made of unusually clean, high-carbon steel that may have been crucible steel imported from Central Asia along Volga trade routes.

Japanese Tamahagane (c. 10th century onward)

Japanese smiths smelted iron sand with charcoal in a clay tatara furnace, producing a bloom (kera) containing tamahagane. Sorted by carbon content, it was folded and forged into the layered structure of the katana.

Damascus Blades (c. 900–1750)

Damascus swords were forged in the Near East from imported wootz ingots and were famous for their toughness and flowing “watered” surface pattern. The craft declined as supplies of suitable wootz dried up.

European Blast Furnace (c. 1150–1400)

Water-powered blast furnaces appeared in medieval Europe, with Lapphyttan in Sweden among the earliest known sites. They produced liquid pig iron in quantity, which then had to be refined into wrought iron.

Finery Forge & Walloon Process (15th–18th century)

Finery forges reheated pig iron in an air blast to burn out carbon and produce wrought iron. The Walloon variant, brought to Sweden by Walloon smiths, made the high-purity Öregrund iron later favoured for steelmaking.

Cementation Process (early 17th century)

In the cementation process, wrought-iron bars were packed in charcoal and heated for about a week so carbon diffused into their surfaces. The resulting blister steel was the main raw material of Sheffield’s cutlery trade.

Darby’s Coke Smelting (1709)

Abraham Darby I smelted iron with coke instead of charcoal at Coalbrookdale, Shropshire, in 1709. Freed from dwindling woodlands, British ironmaking could grow far larger.

Huntsman’s Crucible Steel (1740s)

Benjamin Huntsman, a Doncaster clockmaker working near Sheffield, melted blister steel in clay crucibles over a coke fire in the 1740s. The result was uniform cast steel that made Sheffield the world centre of quality steel for a century.

Steam-Blown Blast Furnaces (1776)

Ironmaster John Wilkinson used a Boulton & Watt steam engine to blow a blast furnace at Willey, Shropshire, in 1776. Steam power freed furnaces from riverside sites and allowed stronger, steadier blasts.

Cort’s Puddling & Rolling (1783–1784)

Henry Cort patented grooved rolls in 1783 and the puddling process in 1784, converting coke pig iron into wrought iron with coal in a reverberatory furnace. Britain’s wrought-iron output multiplied in the decades that followed.

Krupp of Essen (1811 onward)

Friedrich Krupp founded a works in Essen in 1811 to make English-style cast steel. Under his son Alfred, Krupp became a giant of railway materials and armaments.

Neilson’s Hot Blast (1828)

James Beaumont Neilson patented preheating the air blown into blast furnaces in 1828. Hot blast sharply reduced fuel consumption and let Scottish ironworks use raw coal and local blackband ironstone.

Bessemer Process (1856)

Henry Bessemer announced in 1856 that blowing air through molten pig iron burns out carbon and silicon, making steel in minutes without fuel. It was the first cheap process for mass-producing steel.

Mushet’s Spiegeleisen & Tool Steel (1856–1868)

Robert Forester Mushet showed that adding spiegeleisen, a manganese-rich pig iron, fixed the brittleness of Bessemer steel. In 1868 he introduced R. Mushet’s Special Steel, the first commercial tungsten alloy tool steel.

Cowper Regenerative Stove (1857–1860)

Edward Alfred Cowper patented a hot-blast stove in 1857 that stored heat from burning furnace gas in brick checkerwork. Cowper stoves gave much hotter blast than iron-pipe heaters and remain standard at blast furnaces today.

Siemens–Martin Open Hearth (1857–1865)

Carl Wilhelm Siemens developed the regenerative gas furnace, and in 1865 Pierre-Émile Martin used it to make steel from pig iron and scrap. Slower but more controllable than Bessemer, the open hearth dominated world steelmaking for much of the 20th century.

Carnegie Steel (1875–1901)

Andrew Carnegie opened the Edgar Thomson Works at Braddock, Pennsylvania, in 1875 to make Bessemer rails. Relentless cost-cutting and vertical integration from ore to rails made Carnegie Steel the world’s largest steel company.

Thomas–Gilchrist Basic Process (1876–1879)

Sidney Gilchrist Thomas and his cousin Percy Gilchrist lined the Bessemer converter with basic dolomite and added lime, removing phosphorus into the slag. The process unlocked the vast phosphoric ores of Lorraine and fuelled German steel growth.

Hadfield Manganese Steel (1882)

Robert Hadfield of Sheffield patented a steel with about 12–13% manganese in 1882. Extremely tough and work-hardening, it was one of the first true alloy steels.

Homestead Strike (1892)

A lockout at Carnegie’s Homestead Works near Pittsburgh in 1892 escalated into a gun battle between strikers and Pinkerton agents. The defeat of the Amalgamated Association crippled steel unionism in the US for four decades.

Mesabi Range Iron Ore (1890s onward)

The Merritt brothers opened Minnesota’s Mesabi Range in the early 1890s, where soft high-grade ore could be dug by steam shovel. Shipped across the Great Lakes, it fed the mills of Pittsburgh, Cleveland and Gary.

High-Speed Steel (1898–1900)

Frederick Winslow Taylor and Maunsel White at Bethlehem Steel found that heating tungsten-chromium tool steel close to its melting point made it keep its hardness at red heat. Their high-speed steel caused a sensation at the 1900 Paris Exposition.

Héroult Electric Arc Furnace (1900–1907)

Paul Héroult built the first commercial direct electric arc furnace for steel at La Praz, France, in 1900. First used for high-grade alloy steels, the EAF later became the basis of scrap-recycling mini-mills.

U.S. Steel (1901)

J. P. Morgan merged Carnegie Steel with Federal Steel and other firms to form the United States Steel Corporation in 1901. Capitalised at about $1.4 billion, it was the first billion-dollar corporation.

Tata Iron and Steel (1907–1912)

Following Jamsetji Tata’s plans, the Tata Iron and Steel Company was founded in 1907 and poured its first ingot at Sakchi, later Jamshedpur, in 1912. It became the cornerstone of India’s modern steel industry.

Stainless Steel (1912–1913)

In 1913 Harry Brearley in Sheffield cast a 12.8% chromium steel that resisted corrosion. Around the same time Krupp patented austenitic chromium-nickel steels, the basis of today’s 18/8 grades.

Steel Strike of 1919 (1919–1920)

Some 350,000 steelworkers struck in September 1919 for union recognition and an end to the 12-hour day. The strike collapsed in January 1920, though public pressure led U.S. Steel to drop the 12-hour day in 1923.

Continuous Wide Strip Mill (1923–1926)

John B. Tytus developed the continuous wide hot-strip mill at Armco in Ashland, Kentucky, in the 1920s. Cheap, wide sheet steel fed the booming automobile and appliance industries.

European Coal and Steel Community (1951–2002)

Proposed in the 1950 Schuman Declaration and founded by the 1951 Treaty of Paris, the ECSC pooled the coal and steel industries of six European countries. It was the institutional seed of the European Union.

Linz–Donawitz Oxygen Process (1952–1953)

Austrian engineers at VÖEST in Linz started the first oxygen top-blown converter in 1952, building on Robert Durrer’s experiments. Basic oxygen steelmaking replaced the open hearth and now makes about 70% of the world’s steel.

Continuous Casting (1950s onward)

Continuous casting solidifies molten steel directly into slabs, blooms or billets instead of individual ingots. Pioneered for steel by Siegfried Junghans and commercialised in the 1950s, it raised yields and cut energy use dramatically.

Direct Reduction (HYL & Midrex) (1957–1969)

Direct reduction turns iron ore into solid “sponge iron” using reformed natural gas instead of coke. Hylsa’s HYL process (Monterrey, 1957) and the Midrex shaft furnace (Portland, Oregon, 1969) made DRI a feedstock for electric arc furnaces.

Backyard Furnaces (1958–1959)

During the Great Leap Forward, Mao Zedong set a target of doubling China’s steel output in 1958, and millions of people built small backyard furnaces. Much of the iron produced was unusable, and the campaign diverted labour from farming on the eve of famine.

Japan’s Steel Ascendancy (1950s–1970s)

Post-war Japan built large coastal integrated works using imported ore and coal and quickly adopted oxygen converters and continuous casting. The 1970 merger of Yawata and Fuji formed Nippon Steel, then the world’s largest steelmaker.

POSCO (1968–1973)

Pohang Iron and Steel Company was founded in 1968 under Park Tae-joon as a state-backed pillar of South Korea’s industrialisation. Its Pohang works fired its first blast furnace in 1973 and POSCO grew into one of the world’s most efficient steelmakers.

Nucor & the Mini-Mill (1969–1989)

Under Ken Iverson, Nucor opened a scrap-fed electric arc mini-mill in Darlington, South Carolina, in 1969. Its 1989 Crawfordsville plant brought thin-slab casting to flat products, and Nucor became America’s largest steelmaker.

Youngstown “Black Monday” (1977)

On 19 September 1977 Youngstown Sheet and Tube announced the closure of its Campbell Works in Ohio, eliminating about 5,000 jobs. The day came to symbolise the collapse of the American integrated steel industry.

Baosteel (1978–1985)

Construction of the Baoshan works near Shanghai began in December 1978 as a flagship of China’s reform and opening, with technology and assistance from Nippon Steel. Baosteel later merged with Wuhan Iron and Steel to form China Baowu, the world’s largest steelmaker.

China Becomes the Steel Giant (1996–2020)

China passed 100 million tonnes of crude steel in 1996 to become the largest producer, then expanded at an extraordinary pace. By 2020 it produced over a billion tonnes, more than half of the world’s steel.

ArcelorMittal (2006)

Mittal Steel’s hostile takeover of Arcelor in 2006 created ArcelorMittal, the world’s largest steel company at the time. It capped a wave of global consolidation in a long-fragmented industry.

HYBRIT Fossil-Free Steel (2016–2021)

SSAB, LKAB and Vattenfall launched HYBRIT in 2016 to replace coke with fossil-free hydrogen in iron ore reduction. In 2021 the pilot plant in Luleå delivered the first hydrogen-reduced steel to Volvo.

Section 232 Steel Tariffs (2018)

In 2018 the United States imposed a 25% tariff on most steel imports under Section 232, citing national security. Trading partners retaliated, and quota and tariff deals followed with several countries.

Stegra (H2 Green Steel) (2020 onward)

Founded in 2020 as H2 Green Steel, Stegra set out to build the first large-scale green steel plant at Boden in northern Sweden. It combines a large electrolyser, hydrogen direct reduction and electric arc furnaces in one site.

EU Carbon Border Adjustment (2023–2026)

The EU’s Carbon Border Adjustment Mechanism puts a carbon price on imports of steel and other emissions-intensive goods. Reporting began in October 2023, with financial obligations from 2026.

Compiled from public sources; summaries for illustration