STEEL FOR high-frequency hardening

Abstract

This steel for induction hardening includes: in terms of mass%, C: 0.40% or more to 0.75% or less; Si: 0.002% or more to 3.0% or less; Mn: 0.20% or more to 2.0% or less; S: 0.002% or more to 0.1% or less; Al: more than 0.10% to 3.0% or less; P: 0.030% or less; and N: 0.035% or less, with the remainder being Fe and inevitable impurities.

Description

[0001] This application is a divisional application of a patent application with a filing date of January 5, 2010, a Chinese application number of 201080001191.3, and an invention title of "Steel for High Frequency Quenching". technical field [0002] The present invention relates to an induction hardening steel excellent in machinability, and more specifically, to an induction hardening steel used for gears and CVT (Continuously Variable Transmission) or CVJ (Constant Velocity Joint) components for automobiles. [0003] This application claims priority based on Japanese Patent Application No. 2009-007757 filed on January 16, 2009, the content of which is incorporated herein. Background technique [0004] Conventionally, most automotive gears used were subjected to surface hardening treatment, and carburizing, nitriding, and induction hardening were used as surface hardening methods. Among them, "carburizing" is the purpose of hardening by making the matrix high toughness an...

AI Technical Summary

Problems solved by technology

However, this method is not sufficient and requires further refinement by alloying elements

In addition, if restrictions are imposed on the induction hardening method, there is a disadvantage that practical utilization is limited.

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