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Title:
METHOD FOR MANUFACTURING STEEL COMPONENT, AND STEEL COMPONENT
Document Type and Number:
WIPO Patent Application WO/2019/026909
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a steel component in which it is possible to easily manufacture a steel component having suitable surface hardness. A quenching/tempering step is performed at least once using steel that contains, in percent by mass, 0.25-1.10% of C, 0.25-0.80% of Si, 0.80-3.00% of Mn, and 0.05-1.20% of Al, said step involving a quenching process and a tempering process being performed in the stated order at a temperature of at least the A1 transformation temperature and no more than 850°C. The quenching process includes a nitrogen-immersion quenching process to set the surface nitrogen concentration to at least 0.8%. Grain refining is performed after the quenching/tempering step.

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Inventors:
NAKAGAWARA YUJI (JP)
Application Number:
PCT/JP2018/028676
Publication Date:
February 07, 2019
Filing Date:
July 31, 2018
Export Citation:
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Assignee:
AISIN SEIKI (JP)
International Classes:
C21D9/32; C21D1/06; C21D7/06; C21D9/00; C22C38/00; C22C38/06
Domestic Patent References:
WO2009054530A12009-04-30
WO2011114836A12011-09-22
Foreign References:
JP2014012870A2014-01-23
JP2010255099A2010-11-11
JP2007224353A2007-09-06
JPH10176219A1998-06-30
JP2003226918A2003-08-15
JP2004285474A2004-10-14
US20170044636A12017-02-16
Attorney, Agent or Firm:
R&C IP LAW FIRM (JP)
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