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Title:
CASE HARDENED STEEL
Document Type and Number:
Japanese Patent JP2015224350
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a case hardened steel having a component composition scarcely containing Ni and Mo which are expensive elements and having enhanced Cr content, small in anisotropy of cold forgeability, small in depth of a carburization abnormal layer by carburization hardening and excellent in cold forgeability and hardenability.SOLUTION: There is provided a case hardened steel containing, by mass%, Si:0.02 to 1.00%, Mn:0.30 to 1.00%, S:0.002 to 0.015%, Cr:1.50 to 3.00%, Te:0.0003 to 0.0050% and having the content of Si, Mn, Cr and Te with following values fn1, fn2 and fn3 satisfying 30≤fn1≤150, fn2≤0.010 and 0.70≤fn3≤1.10. fn1:Mn/S (1), fn2:Cr×Te (2), fn3:Cr/(Si+2Mn) (3), where symbols of element explain contents of the elements by mass%.

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Inventors:
YAMASHITA TOMOHIRO
NEISHI YUTAKA
HORIMOTO MASAYUKI
IMATAKA HIDEKI
Application Number:
JP2014108077A
Publication Date:
December 14, 2015
Filing Date:
May 26, 2014
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
C22C38/00; C22C38/60
Domestic Patent References:
JP2011157597A2011-08-18
JP2007321211A2007-12-13
JPH0873991A1996-03-19
JP2012117098A2012-06-21
JP2009249685A2009-10-29
Foreign References:
US6090225A2000-07-18
Attorney, Agent or Firm:
Masatake Shiga
Mitsuo Teramoto
Sumio Tanai
Tomoo Katsumata
Hiroshi Yamaguchi



 
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