Method of forming hard steels by case hardening, shot-peening an

Details Method of forming hard steels by case hardening, shot-peening an Method of forming hard steels by case hardening, shot-peening an

1989-09-26

1991-05-28

Andrews, Melvyn J.

Metal treatment

Compositions

Heat treating

148 165, 148 166, C21D 800

Patent

active

050191829

ABSTRACT:
A method of manufacturing a steel member comprising the steps of: carburizing and quenching or carbo-nitriding and quenching a steel material; shot-peening the steel material quenched in the first step without tempering; and aging the steel material shot-peened in the second step. Preferably the steel material comprises 0.1 to 0.4 wt. % C, 0.06 to 0.15 wt. % Si, 0.3 to 1.0 wt. % Mn, 0.9 to 1.2 wt. % Cr, 0.3 to 0.5 wt. % Mo, and the remainder Fe. The steel member is preferably used in transmission gears for automobiles, which require superior strength.

REFERENCES:
patent: 4415378 (1983-11-01), McKinney

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