Title:
HIGH-STRENGTH STEEL MATERIAL HAVING EXCELLENT FATIGUE PROPERTIES, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2014/208082
Kind Code:
A1
Abstract:
The present invention relates to a thick steel sheet having a sheet thickness of 30 mm or more, and provides a high-strength steel material having excellent fatigue properties and a method for producing the high-strength steel material. A high-strength steel material having excellent fatigue properties, said steel material having a chemical composition comprising, in mass%, 0.10 to 0.20% of C, 0.50% or less of Si, 1.0 to 2.0% of Mn, 0.030% or less of P, 0.0005 to 0.0040% of S, 0.002 to 0.07% of Sol.Al, 0.0005 to 0.0050% of Ca and a remainder made up by Fe and unavoidable impurities, wherein the metallic structure has the main phase composed of ferrite and the second phase composed of bainite and pseudo pearlite.
Inventors:
NAKASHIMA KOICHI (JP)
HASE KAZUKUNI (JP)
ENDO SHIGERU (JP)
HASE KAZUKUNI (JP)
ENDO SHIGERU (JP)
Application Number:
PCT/JP2014/003380
Publication Date:
December 31, 2014
Filing Date:
June 24, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/06; C22C38/58
Foreign References:
| JP2010236046A | 2010-10-21 | |||
| JP2012184500A | 2012-09-27 | |||
| JP2013112840A | 2013-06-10 | |||
| JP2013108168A | 2013-06-06 | |||
| JP2013095999A | 2013-05-20 |
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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