U.S. Steel says its preliminary investigation found that the blast happened after pressure built up while a gas valve was ...

“Pressure built inside the valve, leading to valve failure and coke oven gas filling the area and ultimately exploding when ...

The explosion this week at U.S. Steel's Pittsburgh-area plant has reignited debate about its future. The Clairton plant is part of a long-standing steelmaking tradition in the Mon Valley and ...