Steel

Steel
ArcelorMittal Kryvyi Rih · CC BY-SA 4.0 · source
Name	Steel
Type	Alloy
Composition	Iron and Carbon (variable)
Invented	Ancient times; modern processes 19th century
Creators	Hittites; Henry Bessemer; Sir Henry Bessemer; Sidney Gilchrist Thomas; Robert Forester Mushet
Applications	Infrastructure; Transportation; Manufacturing

Steel Steel is an iron-based alloy central to industrialization, infrastructure, and manufacturing across United Kingdom, United States, Germany, Japan, China. Its evolution influenced events such as the Industrial Revolution, the growth of Manchester, the expansion of Transcontinental Railroad (United States), and the armaments programs of Second World War. Major corporations including ArcelorMittal, Nippon Steel, Tata Steel, United States Steel Corporation, and POSCO dominate global production and trade measured in indices like the CRU Group and commodities tracked on exchanges such as the London Metal Exchange.

Introduction

Steel emerged from ancient ironworking traditions practiced by groups including the Hittites and later developed through technological advances during the Industrial Revolution. Pioneers such as Henry Bessemer and inventors like Sidney Gilchrist Thomas and Robert Forester Mushet introduced processes that scaled production in the 19th century, affecting industrial centers in Sheffield, Pittsburgh, Essen, and Osaka. State policies and institutions—exemplified by plans in Soviet Union, postwar rebuilding under the Marshall Plan, and modern industrial policy in People's Republic of China—shaped capacity, trade, and labor relations in steelmaking regions.

Composition and Types

Steel is primarily an alloy of iron with carbon; variations include low-carbon, medium-carbon, and high-carbon steels. Alloying elements such as chromium, nickel, molybdenum, vanadium, and manganese produce classes like stainless steels, tool steels, and high-strength low-alloy (HSLA) steels. Notable grades and standards are specified by bodies such as ASTM International, ISO, DIN, and JIS standards, while product designations appear in catalogs from firms like Thyssenkrupp, BAE Systems, and General Electric for structural, naval, and aerospace applications. Specialized categories include plain-carbon steels, alloy steels, stainless steels (chromium-bearing) used by navies such as Royal Navy and manufacturers like Boeing and Airbus for components and assemblies.

Production and Processing

Modern steel production employs integrated and electric arc furnace (EAF) routes. The integrated route uses blast furnaces fed with iron ore and coke, historically concentrated in regions around Lanzhou, Donetsk, Great Lakes, and Luleå. EAF routes, prominent with recycling and scrap supplied through supply chains involving firms like Recycling Industries Limited and brokers active on markets linked to the World Trade Organization, use electricity often procured under agreements with utilities such as EDF or grid operators in Texas and Bavaria. Key process innovations include the Bessemer process, the Siemens-Martin (open-hearth) process, basic oxygen steelmaking (BOS) developed after work by figures in Ausria and industrial pilots in Germany, and continuous casting advancements from companies like Danieli and SMS group. Downstream processing—hot rolling, cold rolling, annealing, galvanizing by firms such as ArcelorMittal and Nippon Steel & Sumitomo Metal Corporation—supplies sectors including construction projects like Burj Khalifa, transportation programs like Shinkansen, and defense systems procured by ministries including Ministry of Defence (United Kingdom).

Properties and Applications

Mechanical and physical properties—yield strength, tensile strength, toughness, ductility, corrosion resistance—determine use in buildings, bridges, ships, vehicles, tools, pipelines, and machinery. Structural steel enables skyscrapers in New York City, long-span bridges like the Golden Gate Bridge, and stadiums such as Wembley Stadium. Stainless steels are specified for chemical plants operated by corporations like BASF and DuPont, food processing facilities regulated by agencies such as the Food and Drug Administration, and medical devices used in hospitals like Mayo Clinic. High-strength steels are critical to automotive programs from Toyota, Volkswagen, and Ford Motor Company to meet safety standards set by agencies including the National Highway Traffic Safety Administration. Tool steels and specialty alloys serve aerospace projects by NASA and European Space Agency and power-generation turbines built by Siemens Energy.

Environmental and Economic Impacts

Steel production is energy- and carbon-intensive, contributing to greenhouse gas emissions monitored under agreements like the Paris Agreement and affecting national inventories reported to the United Nations Framework Convention on Climate Change. Decarbonization pathways include hydrogen-based direct reduced iron (DRI) pilots supported by firms like SSAB, electrification using renewable power from providers such as Ørsted, carbon capture projects coordinated with institutions like European Investment Bank, and circular economy strategies promoted by the International Energy Agency. Trade dynamics—tariffs, quotas, and antidumping cases adjudicated through institutions such as the World Trade Organization—shape competitiveness among producers in Brazil, India, Canada, and South Korea. Social and economic impacts include labor relations involving unions like the United Steelworkers and regional transitions witnessed in former industrial hubs such as Detroit and Rotherham, prompting policy responses from ministries including Department for Business, Energy and Industrial Strategy and development banks like the World Bank.

Category:Alloys