Patent ID: 8821652
Filing Date: 2014-09-02
Classification: C21D,C22C,Y02P

Abstract:
1. Steel for induction hardening consisting of, by mass %, C: 0.35 to 0.6%, Si: 0.01 to 1%, Mn: 0.2 to 1.8%, S: 0.001 to 0.15%, Al: 0.001 to 1%, Ti: over 0.1 to 0.2%, and Nb: 0.001 to 0.04%, restricting N: 0.0060% or less, P: 0.025% or less, and O: 0.0025% or less, satisfying Nb/Ti≧0.015, and having a balance of iron and unavoidable impurities, a bainite structure fraction of 30% or less (including 0%), and a ferrite crystal grain size number defined by JIS G 0551 of no. 8 to 11.