| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steel material for high frequency induction contour hardening having excellent low cycle fatigue properties. <P>SOLUTION: The steel material is characterized in that A=(Mo+0.227Ni+190B-7.18C-0.087Si-17.2P-2.74V-0.00955Hs+0.0344Nγ), and B=(t×(Hcore)<SP>2</SP>) satisfy the relation of A-0.00000293×B≥14; wherein Hcore is a core hardness; (t) is an effective hardened layer depth; (r) is the radius of the failure zone or the half of the wall thickness of the failure zone; Hs is a surface hardness (HV); and Nγ is the old austenite grain size of an induction hardened layer. <P>COPYRIGHT: (C)2011,JPO&INPIT |
