MARTENSITIC STAINLESS STEEL MATERIAL

Abstract: a martensitic stainless steel material that has high strength and excellent ssc resistance, and also has excellent low-temperature toughness is provided. a martensitic stainless steel material of the present disclosure consists of, by mass %, c: 0.030% or less, si: 1.00% or less, mn: 1.00% or less, p: 0.030% or less, s: 0.0050% or less, cr: 10.00 to 14.00%, ni: 5.00 to 7.50%, mo: 1.10 to 3.50%, al: 0.005 to 0.050%, v: 0.01 to 0.30%, n: 0.0030 to 0.0500%, ti: 0.020 to 0.150%, cu: 1.00 to 3.50%, and co: 0.010 to 0.500%, with the balance being fe and impurities, and has a yield strength of 758 mpa or more. an area fraction of �-ferrite is 5.00% or less, and a length l (�m) of the �-ferrite in the rolling direction and a distance d (�m) between particles of the �-ferrite in the rolling direction satisfy formula (1):

Inventor(s): Toshiya NISHIMURA, Kyohei KANKI

CPC Classification: C22C38/54 (ALLOYS (flints ; treatment of alloys , ))

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