发明名称 |
Method for producing carbonitrided member |
摘要 |
A method for producing a carbonitrided member comprising the steps of carburizing a steel part having a composition of, by mass percent, C: 0.10 to 0.35%, Si: 0.15 to 1.0%, Mn: 0.30 to 1.0%, Cr: 0.40 to 2.0%, S: 0.05% or less with the balance being Fe and impurities in a carburizing atmosphere of 900 to 950° C. The carburized steel part is carbonitrided in a carbonitriding atmosphere with the temperature of 800 to 900° C. and the nitrogen potential of 0.2 to 0.6%. The carbonitrided steel part is qhenched and then shot peened. The shot peening treatment may be further performed while heating to a temperature not higher than 350° C. or immediately after heating to a temperature not higher than 350° C. After quenching, the shot peening treatment may be further performed after tempering in the temperature range exceeding 250° C. and not higher than 350° C. |
申请公布号 |
US9062364(B2) |
申请公布日期 |
2015.06.23 |
申请号 |
US201213415198 |
申请日期 |
2012.03.08 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION;HONDA MOTOR CO., LTD. |
发明人 |
Sano Naoyuki;Horimoto Masayuki;Okada Yoshinari;Amano Masaki;Ninomiya Akihito |
分类号 |
C23C8/32;C23C8/02;C21D1/25;C21D1/74;C21D7/06;C21D9/32;C22C38/02;C22C38/04;C22C38/18;C23C8/22;C23C8/80 |
主分类号 |
C23C8/32 |
代理机构 |
Clark & Brody |
代理人 |
Clark & Brody |
主权项 |
1. A method for producing a carbonitrided member comprising the steps of:
carburizing a steel part having a composition of, by mass percent, C: 0.10 to 0.35%, Si: 0.15 to 1.0%, Mn: 0.30 to 1.0%, Cr: 0.40 to 2.0%, S: 0.05% or less with the balance being Fe and impurities in a carburizing atmosphere at a temperature of 900 to 950° C.; then, while maintaining the carburizing atmosphere, carbonitriding the steel part immediately following the carburizing by holding the carburized steel part in a temperature of 800 -900C. in a carbonitriding atmosphere having a nitrogen potential of 0.2 to 0.6%; quenching the carbonitrided steel part; and shot peening the quenched steel part while heating to a temperature not higher than 350° C. or immediately after heating to a temperature not higher than 350° C., wherein the carburizing atmosphere is maintained with a constant carbon potential throughout carburizing and carbonitriding and up to quenching. |
地址 |
Tokyo JP |