Austenitic stainless steel sheet and a method for its manufacture
AssigneeSumitomo Metal Industries, Ltd.
InventorMasayoshi SAWADA
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Abstract
An austenitic stainless steel sheet for springs having both a high strength and excellent formability has a chemical composition comprising C: 0.01-0.15%, Si: at most 3.0%, Mn: at most 3.0%, Cr: 10.0-30.0%, Ni: 4.0-20.0%, N: at most 0.40%, and a remainder of Fe and impurities, and it has a metallurgical structure such that the austenite content γs (%) in the surface region of the steel sheet and the austenite content γc (%) in the center region of the sheet thickness satisfy (γs+γc)/2≦55 and γs/γc≧0.10, with the remaining structure being primarily strain-induced martensite.
Claims9
An austenitic stainless steel sheet characterized by having a chemical composition comprising, in mass %, C:
- 0.01-0.15%, Si:
- at most 3.0%, Mn:
- at most 3.0%, Cr:
- 10.0-30.0%, Ni:
- 4.0-20.0%, N:
- at most 0.40%, and a remainder of Fe and impurities, and by having a metallurgical structure in which the austenite content γs (%) in a surface region of the steel sheet and the austenite content γc (%) in a center region of the sheet thickness satisfy (γs+γc)/2≦55 and γs/γc≧0.10, with the remaining structure being primarily strain-induced martensite.
Dependencies are inferred from the claim text.