Edgar Thomson Works (U.S. Steel, Braddock)
U.S. Steel, Braddock, Pennsylvania
U.S. Steel's Edgar Thomson Plant in Braddock, Pennsylvania, part of Mon Valley Works, was founded by Andrew Carnegie's firm and made its first Bessemer blow on August 26, 1875. It is still operating, turning iron from two blast furnaces into steel in a basic oxygen shop and casting it into slabs.
- Company
- U.S. Steel
- Status
- Operating
- Opened
- 1875
- Employees
- Not stated
- Industry
- Steel and metals
- Revised
- November 12, 2026
What is made here
Steel slabs, made from blast furnace iron converted in a basic oxygen shop.
Facts
| First blow | The first Bessemer blow was made on August 26, 1875 (company: ussteel.com) |
|---|---|
| Name | Named by Andrew Carnegie's firm, Carnegie-McCandless & Co., for J. Edgar Thomson, president of the Pennsylvania Railroad (company: ussteel.com) |
| Land | Carnegie secured an option on 107 acres along the Monongahela River in 1872 (company: ussteel.com) |
| Blast furnaces | Two blast furnaces, BF#1 and BF#3 (company: ussteel.com) |
| Steelmaking | Two basic oxygen vessels of 250 tons each; 250 tons of steel are produced in under an hour (company: ussteel.com) |
Figures are as stated by the source named next to each one. Company figures are the company's own claims.
Can you visit?
We haven't found a public tour of this factory. See factory tours in Pennsylvania.
Sources
- U.S. Steel: Edgar Thomson Plant operations and environmental report (company, checked November 12, 2026)
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