0001 in, Fabrication Cold Finished, Heat Treatment Through Hardened, Heat Treatable Yes, Mechanical Finish Polished, Not Applicable Brinell Hardness, C58 to C65 Rockwell Hardness, Includes Material Certificate Yes, Standards ANSI/ABMA, Minimum Temperature -300 Degrees F, Maximum Temperature 1,200 Degrees F, Appearance Mirror-Like.