Metal gasket and a material for its manufacture and a method...

Details Metal gasket and a material for its manufacture and a method... Metal gasket and a material for its manufacture and a method...

2005-05-17

2005-05-17

Koehler, Robert R. (Department: 1775)

Stock material or miscellaneous articles

Composite

Of metal

C420S034000, C420S056000, C420S059000, C420S119000, C420S128000, C420S129000, C148S516000, C148S537000, C148S580000, C148S605000, C148S607000, C148S608000, C148S609000, C148S611000, C148S621000, C148S325000, C148S326000, C148S336000, C148S908000, C277S592000, C277S596000

Reexamination Certificate

active

06893727

ABSTRACT:
This invention relates to a stainless steel gasket having markedly improved strength and fatigue properties due to precipitation strengthening. Its composition comprises C: at most 0.03%, Si: at most 1.0%, Mn: at most 2%, Cr: 16.0%-18.0%, Ni: 6.0%-8.0%, N: at most 0.25%, if necessary Nb: at most 0.30%, and a remainder of Fe and unavoidable impurities. After cold rolling, final annealing is carried out, and after a structure is formed of recrystallized grains with an average grain diameter of at most 5 μm having an area ratio of 50-100% and an unrecrystallized portion having an area ratio of 0-50%, a metal gasket is formed by steps including temper rolling with a reduction of at least 30% to make the area ratio of a strain induced martensite phase at least 40%, and forming and heat treatment at 200-350° C. The metal gasket has a duplex phase structure of at least 40% martensite in which chromium nitride is precipitated and a remainder of austenite, or it has a single phase structure of martensite in which chromium nitride is precipitated, and it has Hv of at least 500.

REFERENCES:
patent: 6277215 (2001-08-01), Adachi et al.
patent: 63-206428 (1988-08-01), None
patent: 63-206429 (1988-08-01), None
patent: 04-214841 (1992-08-01), None
patent: 05-117813 (1993-05-01), None
patent: 05-279802 (1993-10-01), None
patent: 08-134595 (1996-05-01), None
patent: 08-134596 (1996-05-01), None
patent: 11-140598 (1999-05-01), None

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