Producer
United States Steel Corporation
Integrated steelmaker; flat-rolled hot-dip galvanized, Galvalume and pre-painted (PPGI) coated sheet. Acquired by Nippon Steel in 2025.
4
Inputs supplied
4
Goods downstream
0
Facilities
0
Stories
What they make
4 inputs United States Steel Corporation supplies
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manufactured
Pipeline Steel (Large-Diameter Line Pipe) →
manufactured
Steel Casing Sheet (HVAC cabinet) →
manufactured
Galvalume / Galvanized Steel Coil →
manufactured
Tinplate Metal Cans (Infant Formula Grade) →
Where it shows up
Goods downstream
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What else they do
Business segments
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North American Flat-Rolled
52%Mini Mill (Big River Steel — EAF)
20%Tubular Products
18%European Flat-Rolled (U.S. Steel Košice)
10%
Intelligence
What's known
Sourced claims about this company's role in supply chains, chokepoints, concentration, incidents, dual-use connections.
Did you know2024
US Steel's high-strength API 5L pipeline steel (used for gas transmission pipelines) and their Defense/military armor steel programs use metallurgically adjacent high-strength low-alloy (HSLA) steel chemistries. The microalloying techniques (niobium, vanadium, titanium additions) that give X70/X80 pipeline steel its combination of high strength and weldability are directly related to the techniques used in military vehicle armor steel (MIL-A-46100, RHA steel) and naval vessel hull steels. US Steel and other domestic integrated producers are qualified defense suppliers for military plate applications. A domestic US steel capacity contraction — or disruption from the Nippon Steel acquisition regulatory conditions — would simultaneously affect natural gas pipeline infrastructure supply and military armor steel production capacity.
United States Steel Corporation ↗Concentration2018
After the Nippon Steel acquisition of US Steel (completed 2025), the top domestic US flat-rolled steel capacity is: Cleveland-Cliffs (~25%), Nucor (~22%), Steel Dynamics (~13%), US Steel/Nippon (~12%), and ArcelorMittal USA (~10%). The acquisition transformed US Steel from a fully domestic company to a subsidiary of a Japanese corporation — raising questions about CFIUS conditions' enforceability and long-term US industrial base policy. The Biden administration's initial attempt to block the deal on national security grounds (overruled by courts) established that US flat-rolled steel capacity is classified as critical infrastructure. Section 232 tariffs (25% on imported steel) were explicitly justified on national security grounds, creating a protected market for domestic steel that may disproportionately benefit the Nippon Steel-owned US Steel — a foreign-parent company benefiting from US national security protectionism.
U.S. Department of Commerce ↗Origin2025
United States Steel Corporation was founded on March 2, 1901, when J.P. Morgan financed the acquisition and merger of multiple steel companies — including Andrew Carnegie's Carnegie Steel (purchased for $480 million, making Carnegie the world's richest man) — to create the world's first billion-dollar corporation. US Steel was capitalized at $1.4 billion in 1901 — a sum larger than the US federal government's annual budget at the time. The company controlled approximately 67% of US steel production at its founding. Over 124 years, US Steel shrank from monopolist to a ~10% US market share producer as EAF minimills (Nucor, SDI) disrupted the integrated steel business model. In 2025, US Steel completed its acquisition by Japan's Nippon Steel — a transaction that required presidential national security review under CFIUS, became a campaign issue in the 2024 election, and was approved with conditions requiring commitments to maintain US production and employment levels.
United States Steel Corporation ↗