Title:
STEEL PRODUCT HAVING EXCELLENT FATIGUE PROPERTY, AND ITS PRODUCTION METHOD
Document Type and Number:
Japanese Patent JP3733967
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To stably provide a steel product having high fatigue strength.
SOLUTION: The steel product has a composition including, by mass%: C: 0.35 to 0.7%, Si: 0.30 to 1.1%, Mn: 0.2 to 2.0%, Al: 0.005 to 0.25%, Ti: 0.005 to 0.1%, Mo: 0.05 to 0.6%, B: 0.0003 to 0.006%, S: 0.06% or less, P: 0.020% or less, Cr: 0.2% or less, and the balance Fe with inevitable impurities. As a base material structure, the steel product comprises a bainite structure and/or a martensite structure in a proportion wherein the sum of the bainite and martensite structures accounts for 10 vol% or more, and the particle diameter of the old austenite structure in the hard layer after induction hardening is 12 μm or less over the whole thickness.
Inventors:
Yasuhiro Omori
Akihiro Matsuzaki
Toru Hayashi
Takaaki Toyooka
Akihiro Matsuzaki
Toru Hayashi
Takaaki Toyooka
Application Number:
JP2004008252A
Publication Date:
January 11, 2006
Filing Date:
January 15, 2004
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21D8/06; C22C38/00; C21D1/10; C21D6/00; C21D9/28; C22C38/60; (IPC1-7): C22C38/00; C21D6/00; C21D8/06; C21D9/28; C22C38/60
Domestic Patent References:
| JP11131176A | ||||
| JP10036937A | ||||
| JP2000154828A | ||||
| JP2002003943A |
Attorney, Agent or Firm:
Kosaku Sugimura