Title:
HIGH TOUGHNESS CARBURIZING STEEL
Document Type and Number:
Japanese Patent JPS621843
Kind Code:
A
Abstract:
PURPOSE: To improve the toughness without reducing the productivity by restricting the amounts of C, Mo, Si, Mn and Ti and regulating the grain size number of a core part and a carburized layer and the Charpy impact value of the core part to a prescribed value or above each after carburization.
CONSTITUTION: This high toughness carburizing steel consists of, by weight, 0.05W0.2% C, 0.5W1% Mo, 1W2% Mo+Si, 0.3W1.5% Mn, 0.05W0.2% Ti and the balance Fe. When the steel is carburized, a fine-grained core part having grain size No.≥9 and ≥12kgf.n/cm2 Charpy impact value and a fine-grained carburized layer having grain size No.≥9 are formed.
Inventors:
SHIBATA KIMIHIRO
MATSUMOTO TAKASHI
TAKADA KATSUNORI
MATSUMOTO TAKASHI
TAKADA KATSUNORI
Application Number:
JP13879785A
Publication Date:
January 07, 1987
Filing Date:
June 25, 1985
Export Citation:
Assignee:
NISSAN MOTOR
DAIDO STEEL CO LTD
DAIDO STEEL CO LTD
International Classes:
C23C8/22; C22C38/00; C22C38/14; C22C38/50; (IPC1-7): C22C38/14; C22C38/50; C23C8/22
Domestic Patent References:
| JPS59232252A | 1984-12-27 | |||
| JPS57192248A | 1982-11-26 |
Attorney, Agent or Firm:
Katsumi Arasaki (1 person outside)