Oregon Steel Mills is proudly based in the United States and wholly owned by Orion Steel Companies (https://www.atlasholdingsllc.com/our-companies/orion-steel-companies/).

Orion Steel Companies are a group of steel manufacturing entities owned by Atlas Holdings, including Rocky Mountain Steel Mills, Oregon Steel Mills, and Interpro Pipe and Steel. They operate in North America, producing engineered steel products for rail, energy, and industrial markets. The companies collectively employ around 3,400 skilled associates and have a steelmaking capacity of 2.3 million tons, with finished steel capacity of 3.5 million tons, including tubular products. Notably, Rocky Mountain Steel Mills is the world's largest solar-powered steel mill and the largest rail supplier in North America.

As a leading North American producer with a more than 150 year legacy, the Orion companies manufacture engineered steel products for rail, energy and industrial end markets, delivering a broad selection of specialty steel solutions to meet customers’ demands in the United States and Canada.

Our Portland facility has the only plate mill in the Western U.S. and adjacent Canadian provinces. We also operate quench and tempering lines. Our proximity to deep water ports and rail allows us to be cost effective.

• Portland Rolling Mill has the unique ability to produce quality discrete plate and coil in custom and standard sizes and specifications. Finished products include hot-rolled carbon and alloy steel plate, hot-rolled coil, heat- treated plate, shot-blasted and primed plate, temper-passed cut-to-length plate and plate coil.
• Our Product Technology Center in Portland enhances our ability to develop high strength steel products for the most demanding applications.