Patent ID: 8535459
Filing Date: 2013-09-17
Classification: C21D,C22C

Abstract:
1. A steel material for hardening, including chemical components, by mass %, of: C: 0.15 to 0.60%; Si: 0.01 to 1.5%; Mn: 0.05 to 2.5%; P: 0.005 to 0.20%; S: 0.001 to 0.35%; Al: over 0.06 to 0.3%; and total N: 0.006 to 0.03%, with a balance including Fe and inevitable impurities including B of not more than 0.0004%, wherein R and H satisfy following Equation (1), where the R is a hardness at a position 5 mm away from a quenching end measured through a Jominy end-quenching method specified in JIS G 0561, and the H is a calculation hardness at a position 4.763 mm away from the quenching end