Nippon Steel Stainless Steel Corporation

Taichiro Mizoguchi

Hiroyasu Matsubayashi

Katsuyuki Shiotsuki

A martensitic stainless steel sheet has a composition containing, (mass %), from 0.10 to 0.15% of C, from 0.05 to 0.80% of Si, from 0.05 to 2.00% of Mn, 0.040% or less of P, 0.003% or less of S, from 0.05 to 0.50% of Ni, from 11.0 to 15.0% of Cr, from 0.02 to 0.50% of Cu, from 0.005 to 0.06% of N, from 0.001 to 0.20% of Al, from 0 to 1.00% of Mo, from 0 to 0.50% of V, from 0 to 0.01% of B, balance Fe and unavoidable impurities. An M value=420C&#x2212;11.5Si+7Mn+23Ni&#x2212;11.5Cr&#x2212;12Mo&#x2212;10V+9Cu&#x2212;52Al+470N+189 is 100 or more. A carbonitride number density having a circle equivalent diameter of 1.0 &#x3bc;m or more is 15.0 or less per 0.01 mm. 0.2% yield strength is 1,100 N/mmor more.

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Tokyo, Japan

Taichiro Mizoguchi