C1018 Cold Finished Flat, aka CRS Flat or Cold Roll Flat Bar is a steel product with closer dimensional accuracy, tolerances, and smoother surface finish than hot rolled bar. C1018 Cold Finish Flat is a general purpose low carbon steel with good case hardening qualities and is especially suited for cold forming and bending. Overall, cold finished steel flats tend to have higher tensile and yield strength, tighter size tolerances, and improved smoothness when compared to hot finished steel. Metals Depot stocks hundreds of sizes of 1018 cold finished steel flat that you can buy online in ready to ship precut or mill lengths or you can order just what you need custom Cut to Size in small or large quantity at wholesale prices.