Patent ID: 8673094
Filing Date: 2014-03-18
Classification: C21D,C22C,C23C

Abstract:
1. A case hardening steel comprising: by mass %, as a chemical composition, C: 0.1% to 0.5%, Si: 0.01% to 1.5% Mn: 0.3% to 1.8%, S: 0.001% to 0.15%, Cr: 0.4% to 2.0%, Ti: 0.05% to 0.2%, Al: limited to 0.2% or less, N: limited to 0.0050% or less, P: limited to 0.025% or less, O: limited to 0.0025% or less, and a balance of Fe and inevitable impurities, wherein a number d of a sulfide having an equivalent circle diameter more than 5 μm per 1 mm