AUSTENITIC STAINLESS-STEEL SHEET FOR GASKET, AND GASKET

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[Problem] To provide a heat-resistant metallic gasket which has been regulated so as to have a strength level (ordinary-temperature hardness) that renders the processing easy and which has excellent gas leak resistance. [Solution] An austenitic stainless-steel sheet for metallic gaskets which has a chemical composition that contains, in terms of mass%, 0.015-0.200% C, 1.50-5.00% Si, 0.30-2.50% Mn, 7.0-17.0% Ni, 13.0-23.0% Cr, and 0.005-0.250% N and optionally further contains one or more of Mo, Cu, Nb, Ti, V, Zr, W, Co, B, Al, REM (rare-earth elements excluding Y), Y, Ca, and Mg, with the remainder comprising Fe and unavoidable impurities, and which has an ordinary-temperature hardness of 430 HV or less. A cross-section thereof perpendicular to the sheet-thickness direction gives an X-ray diffraction pattern in which the peak for the austenite-crystal (311) plane has a half-band width of 0.10-1.60°. The steel sheet has a surface roughness (Ra) of 0.30 µm or less.