METAL GASKET AND ITS LAW MATERIAL AND METHODS FOR PRODUCTION OF THEM

Title:

METAL GASKET AND ITS LAW MATERIAL AND METHODS FOR PRODUCTION OF THEM

Document Type and Number:

WIPO Patent Application WO/2002/088410

Kind Code:

A1

Abstract:

A method for producing a stainless steel gasket, which comprises subjecting a steel having a chemical composition, in mass %: C: 0.03 % or less, Si: 1.0 % or less, Mn: 2 % or less, Cr: 16.0 to 18.0 %, Ni: 6.0 to 8.0 %, N: 0.25 % or less, optinally Nb: 0.30 % or less and balance: Fe and inevitable impurities, to a cold rolling, followed by final annealing, to thereby form a structure containing 50 to 100 area % of recrystallized grains having an average grain diameter of 5 $g(m)m or less and 0 to 50 area % of unrecrystallized portions, subjecting the product to a temper rolling in a rolling reduction of 30 % or more, to form a strain induced martensite phase in an area % of 40 % or more, forming the product, and subjecting the formed article to a heat treatment at a 200 to 350°C. The gasket produced by the above method has a plural phase structure composed of 40 % or more of martensite having chromium nitride precipitates and the balanced amount of austenite, or a single phase structure composed of martensite having chromium nitride precipitates, and has a Hv of 500 or more. The gasket is markedly improved in strength and fatigue characteristics through precipitation strengthening.

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Inventors:

ADACHI KAZUHIKO (JP)
ISHIYAMA SEISHI (JP)
GOSHOKUBO KENICHI (JP)
KATSURAI TAKASHI (JP)

Application Number:

PCT/JP2002/004136

Publication Date:

November 07, 2002

Filing Date:

April 25, 2002

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
HONDA MOTOR CO LTD (JP)
ADACHI KAZUHIKO (JP)
ISHIYAMA SEISHI (JP)
GOSHOKUBO KENICHI (JP)
KATSURAI TAKASHI (JP)

International Classes:

C21D8/02; C22C38/00; C22C38/02; C22C38/04; C22C38/48; C22C38/58; (IPC1-7): C22C38/00

Foreign References:

JPH11140598A	1999-05-25
JPH08134596A	1996-05-28
JPH08134595A	1996-05-28
JPH05279802A	1993-10-26

Other References: