Title:
METHOD FOR QUENCHING STEEL PRODUCT
Document Type and Number:
WIPO Patent Application WO/2008/059759
Kind Code:
A1
Abstract:
This invention provides a method for quenching a steel product such as a high-strength
boron steel, which method can prevent the formation of a slack hardened structure
of a steel product surface layer after quenching to provide an even structure
and thus to improve mechanical properties of the steel product. In quenching
of a high-strength boron steel, a vapor film breaking time, which is an elapse
time from a cooling start point to a treating material temperature sharp drop
point, is regarded as a control item for determining the properties of a quenching
oil, and quenching is carried out in a quenching oil which has been regulated so
thatthe vapor film breaking time is a predetermined time or less (2.1 sec or less
as determined by a cooling property testing method specified in JIS K 2242). The
vapor film breaking time is regulated by preparing a quenching oil comprising
a mineral oil as a base oil and various polymers with a high molecular weight mixed,
into the base oil, as an additive for vapor film breaking time shortening purposes.
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Inventors:
OKUMIYA MASAHIRO (JP)
AIMONO GOUSUKE (JP)
NAGAI TAKAYUKI (JP)
ASADA SHIGERU (JP)
TOMITA YOSHIHIRO (JP)
AIMONO GOUSUKE (JP)
NAGAI TAKAYUKI (JP)
ASADA SHIGERU (JP)
TOMITA YOSHIHIRO (JP)
Application Number:
PCT/JP2007/071770
Publication Date:
May 22, 2008
Filing Date:
November 09, 2007
Export Citation:
Assignee:
TRW AUTOMOTIVE JAPAN CO LTD (JP)
NAGAI SHOKAI CO LTD (JP)
NIPPON GREASE CO LTD (JP)
OKUMIYA MASAHIRO (JP)
AIMONO GOUSUKE (JP)
NAGAI TAKAYUKI (JP)
ASADA SHIGERU (JP)
TOMITA YOSHIHIRO (JP)
NAGAI SHOKAI CO LTD (JP)
NIPPON GREASE CO LTD (JP)
OKUMIYA MASAHIRO (JP)
AIMONO GOUSUKE (JP)
NAGAI TAKAYUKI (JP)
ASADA SHIGERU (JP)
TOMITA YOSHIHIRO (JP)
International Classes:
C21D1/58; C10M101/02; C10M159/04; C10M171/00; C21D1/18; C21D9/00; C22C38/00; C22C38/32; C10N20/00; C10N40/20
Domestic Patent References:
| WO2005087955A1 | 2005-09-22 |
Foreign References:
| JP2004307932A | 2004-11-04 |
Attorney, Agent or Firm:
SHAMOTO, Ichio et al. (Section 206 New Ohtemachi Bldg.,2-1, Ohtemachi 2-chom, Chiyoda-ku Tokyo 04, JP)
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