U.S. Steel

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American steel producer established in 1901 and acquired by Nippon Steel in 2025.

Last updated November 4, 2026

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Overview

U.S. Steel, formally United States Steel Corporation, is an American steel producer whose history is closely tied to the development of large-scale industrial manufacturing in the United States. It was created in 1901 when financier J. P. Morgan combined Carnegie Steel Company, Federal Steel Company, and National Steel Company. The resulting enterprise was the first American corporation capitalized at more than one billion dollars and, at its formation, by far the largest steel producer in the country. Its early scale reflected the consolidation of iron ore, coal, transportation, coke, steelmaking, and finishing operations under one corporate structure. For much of the twentieth century, U.S. Steel was known simply as “The Corporation.” Its mills, mines, rail connections, Great Lakes shipping operations, and extensive workforce made it a central institution in American heavy industry. Production reached more than 35 million tons in 1953, while employment peaked at more than 340,000 workers during World War II. The company supplied steel for infrastructure, vehicles, machinery, consumer goods, and wartime production. It also became associated with the industrial communities of Pennsylvania, Ohio, Indiana, Alabama, and other steelmaking regions. The company’s historical development included both technological and labor milestones. In 1907 it acquired Tennessee Coal, Iron and Railroad Company, strengthening its southern operations. In 1908 it established a formal safety committee that helped popularize the “Safety First” approach in industrial workplaces. At the same time, U.S. Steel faced antitrust scrutiny, labor conflict, racial injustice controversies connected with Southern operations and convict leasing, and criticism that its size did not always translate into operating efficiency or rapid modernization. A federal attempt to break up the company under antitrust law failed, while a 1952 presidential seizure of its mills during a labor dispute was blocked by the Supreme Court. After the Second World War, imported steel, changing industrial demand, foreign competition, and restructuring reduced the company’s employment and market share. U.S. Steel diversified into energy during the 1980s, acquiring Marathon Oil and Texas Oil and Gas. In 1986 it reorganized as USX Corporation, with steel operating as a major subsidiary. A lengthy 1986–1987 labor stoppage severely affected its steel business and was followed by permanent plant closures. In 2001 the company separated Marathon and most other non-steel assets and returned to the U.S. Steel name. It subsequently sold its Serbian operations to the Serbian government in 2012 and acquired National Steel’s assets in 2003 after that company entered bankruptcy. In the twenty-first century, U.S. Steel concentrated increasingly on flat-rolled, tubular, advanced high-strength, electrical, and other value-added products. Its strategic emphasis shifted toward newer electric-arc-furnace capacity and lower-emissions production. The company acquired the remaining interest in Big River Steel in 2021 after first taking a minority stake, and began construction of a new mill in Osceola, Arkansas, in 2022. Big River Steel became the first ResponsibleSteel-certified site in North America in 2022. U.S. Steel’s ownership changed fundamentally in 2025. Nippon Steel announced a proposed acquisition in December 2023 for approximately $14.9 billion. The transaction was opposed by the United Steelworkers, some political leaders, and the Biden administration, which cited national-security and strategic-industry concerns and formally blocked the deal in January 2025. U.S. Steel and Nippon Steel sued over the decision. The transaction was ultimately completed on June 18, 2025, making U.S. Steel a subsidiary of Nippon Steel North America while retaining the U.S. Steel name and Pittsburgh headquarters. The arrangement included a federal-government oversight mechanism through a golden share. U.S. Steel there…

History

U.S. Steel was formed in 1901 through the consolidation of Carnegie Steel, Federal Steel, and National Steel under J. P. Morgan’s financial direction. Its creation marked a major stage in the concentration of American heavy industry. The company combined steel plants with mines, coke works, transport assets, and Great Lakes shipping. In its first full year it produced roughly two-thirds of American steel, giving it enormous influence over industrial supply and labor relations. The corporation expanded in the early twentieth century, notably through its 1907 acquisition of Tennessee Coal, Iron and Railroad Company. In 1908 it created a safety committee that helped institutionalize formal workplace-safety management in American industry. U.S. Steel remained the dominant domestic producer, but competitors such as Bethlehem Steel often developed products and processes more aggressively. Federal antitrust authorities challenged the company in 1911; the effort to dissolve it ultimately failed. The company’s Southern expansion also forms a contested part of its history. Historical scholarship has linked some of its Alabama growth to convict leasing and discriminatory labor systems that supplied workers under coercive and dangerous conditions. These practices, as well as the company’s conduct during the era of segregation, remain important subjects in accounts of U.S. Steel’s social and labor history. U.S. Steel was a major wartime supplier. Employment reached its highest level during World War II, and production later peaked at more than 35 million tons in 1953. Labor relations became nationally significant. In 1952 President Harry Truman attempted to seize the company’s mills during a steel dispute, but the Supreme Court ruled that the president lacked authority to do so. In 1962 President John F. Kennedy pressured steel companies to withdraw a price increase that his administration regarded as inflationary. Postwar restructuring weakened the company’s relative position. Foreign competition, technological change, shifting demand, and the migration of manufacturing reduced employment and market share. During the 1980s U.S. Steel diversified into energy, acquiring Marathon Oil in 1982 and later Texas Oil and Gas. The company reorganized as USX Corporation in 1986. That year, a dispute with the United Steelworkers led to a work stoppage lasting from August 1986 into early 1987. Most facilities were idle, and several plants were subsequently closed permanently. In 2001 USX separated Marathon and other non-steel assets and restored the U.S. Steel identity. The company acquired National Steel’s assets in 2003 following National Steel’s bankruptcy and expanded internationally through acquisitions in Slovakia and Serbia. It sold the Serbian mills to the Serbian government in 2012 amid financial pressure. U.S. Steel also invested in information systems and manufacturing modernization during the early 2010s. The company’s later strategy emphasized advanced products and electric-arc-furnace capacity. In 2019 it purchased a 49.9 percent stake in Big River Steel, a newer and technologically advanced flat-rolled producer. It agreed to acquire the remaining interest in 2020, completing the purchase in 2021. Construction began on a new Arkansas mill in 2022, and Big River Steel achieved ResponsibleSteel certification that year. In 2023 U.S. Steel became the subject of competing acquisition interest, including a proposal from Cleveland-Cliffs and a substantially larger offer from Nippon Steel. U.S. Steel shareholders approved the Nippon proposal in 2024, but the United Steelworkers and political opponents objected. The Biden administration blocked the transaction in January 2025, and both companies filed suit. After further negotiations and government involvement, Nippon Steel completed the acquisition on June 18, 2025. U.S. Steel continued operating under its established name, with its Pittsburgh headquarters retained and federal oversight established through a golden share.

2025
Acquisition by Nippon Steel closes
[1]U.S. Steelen.wikipedia.org
U.S. Steel became a subsidiary of Nippon Steel North America on June 18, 2025.
2023
Nippon Steel announces acquisition proposal
[1]U.S. Steelen.wikipedia.org
Nippon Steel proposed acquiring U.S. Steel for approximately $14.9 billion.
2022
Arkansas mill construction begins
[1]U.S. Steelen.wikipedia.org
U.S. Steel began construction of a new mill in Osceola, Arkansas, while Big River Steel received ResponsibleSteel certification.
2021
Big River Steel becomes a wholly owned operation
[1]U.S. Steelen.wikipedia.org
U.S. Steel completed its purchase of the remaining interest in Big River Steel.
2019
Investment in Big River Steel
[1]U.S. Steelen.wikipedia.org
U.S. Steel acquired a 49.9 percent stake in the newer electric-arc-furnace producer.
2003
National Steel assets are acquired
[1]U.S. Steelen.wikipedia.org
U.S. Steel purchased National Steel assets after National Steel entered bankruptcy.
2001
U.S. Steel name returns
[1]U.S. Steelen.wikipedia.org
The company spun off Marathon and most non-steel assets and restored the U.S. Steel identity.
1986
Company reorganizes as USX
[1]U.S. Steelen.wikipedia.org
The steel business became USS, Inc. within USX Corporation as the company diversified into energy.
1986
Major labor stoppage begins
[1]U.S. Steelen.wikipedia.org
Approximately 22,000 employees stopped work during a contract dispute with the United Steelworkers.
1982
Marathon Oil is acquired
[1]U.S. Steelen.wikipedia.org
U.S. Steel expanded its energy portfolio through the purchase of Marathon Oil.
1953
Production reaches a postwar peak
[1]U.S. Steelen.wikipedia.org
Annual production exceeded 35 million tons.
1908
Formal industrial safety program begins
[1]U.S. Steelen.wikipedia.org
The company formed a safety committee that helped advance the Safety First movement.
1907
Tennessee Coal, Iron and Railroad is acquired
[1]U.S. Steelen.wikipedia.org
The acquisition expanded U.S. Steel’s Southern production and raw-material base.
1901
U.S. Steel is established
[1]U.S. Steelen.wikipedia.org
J. P. Morgan organized the merger of Carnegie Steel, Federal Steel, and National Steel, creating one of the world’s largest industrial corporations.

Products and positioning

A large American steelmaker combining integrated steelmaking, electric-arc-furnace production, domestic raw-material operations, and engineered steel products for automotive, construction, energy, appliance, electrical, industrial, and distribution customers.

Steel products
Flat-rolled steel
Flat-rolled steel is a core U.S. Steel product family used in automotive bodies, appliances, construction, industrial equipment, electrical applications, and distribution. Products include coated and uncoated sheet and other rolled formats made through integrated and electric-arc-furnace operations.
Steel products
Tubular products
U.S. Steel manufactures tubular steel for energy, construction, industrial, and infrastructure applications. The portfolio includes products used where strength, dimensional consistency, and resistance to demanding service conditions are important.
Specialty steel
Automotive steel
Automotive offerings include conventional and advanced high-strength steels designed for vehicle structures, closures, safety components, and related applications. The products support automakers seeking combinations of formability, strength, weight efficiency, and corrosion protection.
Specialty steel
Electrical steel
Electrical steel is engineered for magnetic performance in motors, generators, transformers, and other electrical equipment. It is part of U.S. Steel’s value-added portfolio serving electrification and industrial customers.
Raw materials
Iron ore and coke
The company has historically operated iron-ore mining and coke-production assets that support integrated steelmaking. These operations connect raw-material supply with blast-furnace production and provide part of the company’s vertically integrated industrial base.

Controversies

2008
Historical convict-leasing and labor exploitation allegations
Historical research alleged that U.S. Steel’s Southern growth benefited from discriminatory laws and convict-leasing arrangements that exposed Black prisoners to coercive, dangerous mining labor. The subject concerns the company’s historical operating environment and remains contested in public accounts of its legacy.
Source

2025
Completion of Nippon Steel acquisitionM&A
Background
The transaction faced a U.S. government block, litigation, and labor and political opposition.
Action taken
Nippon Steel completed the acquisition on June 18, 2025, placing U.S. Steel under Nippon Steel North America while retaining the U.S. Steel brand and Pittsburgh headquarters.
Aftermath
U.S. Steel ceased to be an independently listed public company, and the United States government received an oversight role through a golden share.
Source
2023
Nippon Steel acquisition proposalM&A
Background
U.S. Steel became the subject of competing takeover interest after Cleveland-Cliffs made an earlier offer.
Action taken
Nippon Steel proposed acquiring U.S. Steel for approximately $14.9 billion and committed to retaining the U.S. Steel name, Pittsburgh headquarters, and union contracts.
Aftermath
The proposal triggered opposition from the United Steelworkers and political controversy before closing in 2025.
Proposed transaction value. $14.9 billion (December 2023 announcement)
- Cleveland-Cliffs — Cleveland-Cliffs had previously offered to acquire U.S. Steel for approximately $7.3 billion.
Source
2020
Agreement to acquire remaining Big River Steel interestM&A
Background
The initial investment gave U.S. Steel a strategic position in an electric-arc-furnace flat-rolled producer.
Action taken
U.S. Steel announced a $774 million purchase of the remaining Big River Steel interest.
Aftermath
The acquisition was completed in January 2021.
Acquisition price. $774 million (December 2020 announcement)
Source
2019
Initial Big River Steel investmentM&A
Background
U.S. Steel was pursuing newer production technology and a stronger position in advanced flat-rolled products.
Action taken
It invested $700 million for a 49.9 percent stake in Big River Steel.
Aftermath
U.S. Steel later acquired the remaining interest, making Big River Steel part of its wholly owned operating platform.
Investment amount. $700 million (2019)
Source
1986
Diversification into energy through USXStrategy
Background
U.S. Steel sought to reduce dependence on steel during a period of industry restructuring and weak domestic demand.
Action taken
It reorganized as USX Corporation and treated steel as a major subsidiary alongside energy assets.
Aftermath
Energy operations later generated much of the group’s revenue until the 2001 separation restored U.S. Steel as a primarily steel-focused company.
Source

Recent events

2021-11-03
U.S. Steel reports third-quarter earnings[3]U.S. Steel公布第三季度业绩agmetalminer.com
Reported: 2021-11-03
U.S. Steel reported third-quarter net earnings of $1.54 billion, compared with a net loss of $254 million in the third quarter of 2020.
2021-09-27
U.S. Steel temporarily idles Portage operations after a wastewater leak[4]美国钢铁公司因废水泄漏暂时停止波蒂奇工厂运营michiganpublic.org
Reported: 2021-09-27
U.S. Steel temporarily idled operations at its Portage, Indiana plant as a precaution after an orange substance leaked into a Lake Michigan tributary. The substance's contents were not described; initial indications showed higher-than-normal suspended solids in the water.
2021-06-09
FTAI and US Steel agree to an exclusive rail partnership[5]FTAI 与 US Steel 达成独家铁路合作railwaygazette.com
Reported: 2021-06-09
As part of the Transtar deal, FTAI agreed to provide rail services to US Steel for an initial 15-year term, with minimum volume commitments for the first five years.
Unconfirmed
U.S. Steel acquires steel patents and trademarks from The NanoSteel Company[6]美国钢铁公司收购The NanoSteel Company的钢铁专利和商标agmetalminer.com
Reported: 2021-03-08
U.S. Steel announced that it had acquired flat-rolled sheet steel patents and trademarks from The NanoSteel Company, Inc.
2020-12-22
U.S. Steel exercises option to acquire remaining Big River Steel stake[7]美国钢铁公司行使收购 Big River Steel 剩余股权的选择权thomasnet.com
Reported: 2020-12-22
U.S. Steel exercised its option to acquire the remaining equity of Big River Steel and said it would pay approximately $774 million in cash. The transaction was expected to close in early 2021, subject to closing conditions and antitrust approval.
Unconfirmed
U.S. Steel donates to Northwest Indiana food banks[8]美国钢铁公司向西北印第安纳州食品银行捐款nwitimes.com
Reported: 2020-11-25
U.S. Steel donated $30,000 to local food banks in Northwest Indiana to help meet increased need for food assistance during the holiday season.
2020-03-20
U.S. Steel releases first-quarter guidance[9]美国钢铁公司发布第一季度业绩指引agmetalminer.com
Reported: 2020-03-20
U.S. Steel released first-quarter guidance, reporting expected EBITDA of $31 million and a diluted loss per share of $0.80.
2020-02-29
U.S. Steel completes buyout of POSCAL’s UPI ownership interest[10]美国钢铁公司完成收购POSCAL持有的UPI股权finance.yahoo.com
Reported: 2020-03-02
United States Steel Corporation completed the buyout of POSCO-California Corporation’s 50% partnership interest in USS-POSCO Industries, effective February 29, 2020.
2020-02
U.S. Steel acquires remaining stake in USS-POSCO Industries[11]美国钢铁公司收购USS-POSCO Industries剩余股权thomasnet.com
Reported: 2020-03-13
U.S. Steel completed its purchase of POSCO-California Corp.'s 50% stake in USS-POSCO Industries at the end of February, acquiring the entirety of the joint venture.
Unconfirmed
U.S. Steel announces indefinite idling of Great Lakes Works[12]U.S. Steel宣布无限期闲置Great Lakes Worksagmetalminer.com
Reported: 2019-12-24
U.S. Steel announced the indefinite idling of its Great Lakes Works plant in Ecorse, Michigan, a decision that led to more than 1,545 layoffs.

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