Composition (Nominal)
0.95/1.20 C, 1.25 Mn, 0.04 P, 0.15 S or Se min., 1.00 Si, 16.00/18.00 Cr, 0.60 Mo, Bal. Fe
This high-carbon chromium steel is designed to provide stainless properties with maximum hardness; approximately Rockwell C 60 after heat treatment. Type 440F or 440F-Se should be considered for machined parts which require higher hardness values than possible with other free-machining grades.