The steel null carbon content for carburization which is superior

摘要

PROBLEM TO BE SOLVED: To improve torsional fatigue characteristics in steel to be carburized.;SOLUTION: In the steel to be carburized, which has a carbon content of 0.1-0.3 mass% and contains Cr, this steel includes at least one element selected among Co, Ni, and Cu, in a range satisfying the expression (1): [Co]+2.1×[Ni]+2.8×[Cu]-2.4×[Cr]0, (where [Co], [Ni], [Cu], or [Cr] indicates respectively Co content in the steel (mass%), Ni content (mass%), Cu content (mass%), or Cr content (mass%)).;COPYRIGHT: (C)2003,JPO