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US 11,597,982 B2Granted
Production process of fine-grained austenitic stainless steel
AssigneeJapan Atomic Energy Agency
InventorsNoriaki Hirota, Tomoaki Takeuchi, Hiroko Nakano, Atsushi Kikuchi
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Abstract
A process of producing a fine-grained austenitic stainless steel, the process comprising a step of subjecting a fine-grained austenitic stainless steel comprising: C: 0.15 wt % or less, Si: 1.00 wt % or less, Mn: 2.0 wt % or less, Ni: 6.0 to 14.0 wt %, Cr: 16.0 to 22.0 wt %, and Mo: 3.0 wt % or less, with the balance being Fe and inevitable impurities, and having an average grain size of 10 μm or lower, to an annealing treatment at a temperature from 600° C. to 700° C. for 48 hours or longer.
Claims5
A fine-grained austenitic stainless steel comprising:
- C:
- 0.15 wt % or less, Si:
- 1.00 wt % or less, Mn:
- 2.0 wt % or less, Ni:
- 6.0 to 14.0 wt %, Cr:
- 16.0 to 22.0 wt %, and Mo:
- 3.0 wt % or less, with the balance being Fe and inevitable impurities, and having an average grain size of 3 μm or lower,
- wherein said fine-grained austenitic stainless steel exhibits a tensile strength×elongation balance of 17000 MPa % or higher in slow strain rate test at a temperature of 325° C. and a pressure of 15 MPa in the presence of a dissolved oxygen content of lower than 1 ppb, and wherein a chromium carbide content of said fine-grained austenitic stainless steel is not more than 1% with respect to a chromium carbide content of a raw material thereof, coarse-grained stainless steel.
5 more elements
Dependencies are inferred from the claim text.