密合垫用沃斯田系不锈钢板及密合垫

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本发明提供一种耐热金属密合垫，该耐热金属密合垫系调整至容易加工之强度水准(常温硬度)，且具有优异之耐气体外泄性。; 本发明为一种金属密合垫用沃斯田系不锈钢板，该不锈钢板含有以质量%计C：0.015至0.200%，Si：1.50至5.00%，Mn：0.30至2.50%，Ni：7.0至17.0%，Cr：13.0至23.0%，N：0.005至0.250%，视需要含有Mo、Cu、Nb、Ti、V、Zr、W、Co、B、Al、REM(除了Y之稀土元素)、Y、Ca、Mg之1种以上，剩余部分具有由Fe及不可避免的杂质而成之化学组成，常温硬度为430HV以下，与板厚方向垂直之截面之X线绕射图样中沃斯田结晶(311)面峰之半峰宽度为0.10至1.60°，表面粗度Ra为0.30μm以下。 This invention provides a heat-resistant metallic gasket of which the hardness is adjusted to a level of strength (at a normal temperature) to enable an easy processing, the metallic gasket having excellent anti-gas leakage characteristics. The metallic gasket is made of an Austenite series stainless steel sheet containing the following compositions, by % mass; C : 0.015-0.200 %, Si : 1.50-5.00 %, Mn : 0.30-2.50 % Ni : 7.0-17.0 % Cr : 13.0-23.0 % N : 0.005-0.250 %, and optimally one or more than one kind of Mo, Cu, Nb, Ti, Vi, Zr, W, Co, B, Al, REM(a rare earth element excluding Y), Y, Ca, Mg, and the remaining portion including Fe and unavoidable impurities, the steel sheet has a hardness of 430 Hv or less at a normal temperature, a half value width of peak of Austenite crystal (311) plane of 0.10-1.60° in X ray diffraction pattern of a cross section perpendicular to the direction of thickness of the sheet, and a surface thickness Ra of 0.30 μ m or less.