Martensitic stainless steel

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(57) Abstract : A martensitic stainless steel which has a essential chemical composition, in mass %, wherein C : 0.001 to 0.1%, Si : 0.05 to 1.0 %, Mn : 0.05 to 2.0 %, P : 0.025 % or less, S : 0.010 % or less, Cr : 11 to 18 %, Ni : 1.5 to 10 %, sol.Ah 0.001 to 0.1%, N : 0.1% or less, O : 0.01% or less, Cu : 0 to 5 %, and Mo forming a solid solution : 3.5 to 7 %, wherein the following .4 formula (1) is satisfied mid optionally one or more elen 1 euts selected from 0 0 0 0 at least one group of the following A to C groups are further contained, and wherein the balance is composed of Fe, Mo forming no solid solution, if any, and impurities, formula (1) : Ni-bal.= 30(C+N)+0.5(Mn+Cu)+Ni+8.2 0-1.1(Cr+Mo+l.5Si) > -4.5; A group - W : 0.2 to 5 %, B group - V : 0.001 to 0.50 %, Nb : 0.001 to 0.50 %, Ti : 0.001 to 0.50 % and Zr : 0.001 to 0.50 %, ) i I I I C group - Ca : 0.0005 to 0.05 %, Mg : 0.0005 to 0.05 %, REM : 0.0005 to 1 2 3 4 0.05 % and B : 0.0001 to 0.01%. The martensitic stainless steel has the re- i M o C %) sistance to sulfide stress corrosion cracking being superior to that of super 13 Cr steel and exhibits the strength and corrosion resistance comparable to those of duplex stainless steel. 0-#- )b -> ( F X >L, X %7 C : 0.001 0.1%, Si : 0.05 1.0%, Mn : 0.05 2.0%, P : 0.025%PJ, -F, S : 0.010 % l -F, Cr : ll 18 %, Ni : l.5 10 %, sol.Al : 0.001 0.1%, N : 0.1%Bt-F, O : 0.01%P.I-F, Cu : 0 5%, l Mo I I I 1 I , , 1 2 3 4 : Ni-bal.-30(C+N)+0.5 (Mn+Cu)+Ni+8.2-1.1 (Cr+Mo+ 1.5Si) -4.5 A I -W : 0.2 5 % ; B "$-V : 0.001 0.50 %, Nb : 0.001 0.50%, Ti : 0.001 0.50%, o O Zr : 0.001 0.50%; C 1..AMOUNT OF Mo ADDED (MASS %) AMOUNT OF Mo FORMING SOLID SOLUTION (MASS %) -Ca : 0.0005 0.05 %, Mg : 0.0005 0.05 %, REM : 0.0005 0.05 %, o D : B : O.O001 0.01% o