Founded in 1927, Mapes & Sprowl Steel is one of the leading service centers in the United States. The company specializes in enameling steel for porcelain-coating applications and silicon steel for electrical applications. Mapes & Sprowl Steel is a member of the Steel Service Center Institute (SSCI). It maintains one of the largest enameling steel inventories of any service center in the industry. Mapes & Sprowl Steels is a full-service supplier of electrical steel sheet and coils, including fully processed, semi processed, cold rolled and CRML electrical steel.