发明名称 |
Method of carburizing spheroidizing and quenching |
摘要 |
A method of carburizing and quenching involves the following three steps of: pre-carburizing a steel member containing Cr with precipitating carbide by heating to achieve a surface carbon concentration of not less than 1%; spheroidizing the carbide obtained by alternately holding the steel member at a temperature slightly above and slightly below the A1 transformation temperature under a carbon potential of from 0.5 to 1.0%; and carburizing and quenching or carbo-nitriding and quenching the steel member followed by reheating at not more than the heating temperature of pre-carburizing.
|
申请公布号 |
US4971634(A) |
申请公布日期 |
1990.11.20 |
申请号 |
US19890384765 |
申请日期 |
1989.07.25 |
申请人 |
MAZDA MOTOR CORPORATION |
发明人 |
SHIBATA, SHINYA;MIWA, YOSHIHISA;KOJIMA, YOSHIHIKO;ARIMI, YUKIO |
分类号 |
C21D1/06;C21D1/32;C21D6/00;C21D9/32;C23C8/22;C23C8/32 |
主分类号 |
C21D1/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|