Austenitic high Mn stainless steel and method production of same and member using that steel
AssigneeNippon Steel & Sumikin Stainless Steel Corporation
InventorsMasaharu Hatano, Shigeo Fukumoto, Hideki Fujii, Shinichi Ohmiya
Life of this patent
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Abstract
Inexpensive stainless steel and inexpensive and high strength stainless steel which has excellent hydrogen environment embrittlement resistance even if used in a hydrogen resistant environment in over 40 MPa high pressure hydrogen gas or a hydrogen resistant environment in liquid hydrogen, characterized by containing, by mass %, C: 0.1% or less, Si: 0.4 to 1.5%, Mn: 8 to 11%, Cr: 15 to 17%, Ni: 5 to 8%, Cu: 1 to 4%, and N: 0.01 to less than 0.15% and having a balance of Fe and unavoidable impurities, having a volume rate of δ-ferrite of 10% or less, and having a long axis of δ-ferrite before annealing of 0.04 to 0.1 mm.
Claims20
Austenitic high Mn stainless steel characterized by containing, by mass%, C:
- 0.1% or less, Si:
- 0.4 to 1.5%, Mn:
- 8 to 11%, Cr:
- 15 to 17%, Ni:
- 5 to 8%, Cu:
- 1 to 4%, Mo:
- 0.05 to 0.2%, and N:
- 0.01 to less than 0.15% and having a balance of Fe and unavoidable impurities, having a volume rate of δ-ferrite of 5% or less, and having a long axis of δ-ferrite of less than 0.05 mm.
Austenitic high Mn stainless steel characterized by containing, by mass%, C:
- 0.1% or less, Si:
- 0.4 to 1.5%, Mn:
- 8 to 11%, Cr:
- 15 to 17%, Ni:
- 6 to 8%, Cu:
- 1 to 4%, Mo:
- 0.05 to 0.2%, and N:
- 0.15 to 0.3% and having a balance of Fe and unavoidable impurities, having a volume rate of δ-ferrite of 5% or less, and having a long axis of δ-ferrite of less than 0.05 mm.
Dependencies are inferred from the claim text.