Standard Steel Casting Company

The Standard Steel Casting Company, commonly referred to as Thurlow Works, was a steel production and steel casting facility founded in Chester, Pennsylvania, in 1883 by shipbuilder John Roach. The company was established primarily to supply steel ingots for Roach's steel mills, which included the Chester Rolling Mill and the Combination Steel and Iron Company, although it also manufactured steel castings. Standard Steel was the first company in the United States to manufacture commercial quantities of steel utilizing the acid open hearth process.

Roach relinquished majority ownership of the company in 1884 to Robert Wetherill. In subsequent years, Thurlow Works made a name for itself as a manufacturer of large steel castings, especially for the railroad industry. America's first cast steel locomotive frames were poured at Thurlow in 1893.

The Standard Steel Casting Company was merged with several other steel casting companies in 1892 to become the American Steel Casting Company. The American Steel Casting Company was itself merged some years later to form one of America's largest steel companies, American Steel Foundries.