Weirton Steel is a steel manufacturing company located in Weirton, West Virginia. Founded in 1909, it became one of the largest integrated steel mills in the United States. The company primarily produced flat-rolled steel products, which are used in various industries, including automotive and construction. In the late 20th century, Weirton Steel faced challenges due to economic changes and competition. In 2003, the company filed for bankruptcy and was subsequently acquired by International Steel Group. Today, the facility continues to operate, contributing to the local economy and the steel industry.