Austenitic stainless steel sheet
AssigneeNippon Steel Stainless Steel Corporation
InventorsChikako YOSHII, Junichi HAMADA
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Abstract
Austenitic stainless steel sheet excellent in high-temperature fatigue characteristics able to be applied to exhaust manifolds and turbo exhaust pipes of automobiles and other parts subjected to vibration at 400° C. to 600° C. temperatures is provided, specifically, austenitic stainless steel sheet excellent in high-temperature fatigue characteristics comprising, by mass %, C: 0.002 to 0.3%, Si: 1.0 to 4.0%, Mn: 0.05 to 3.0%, P: 0.01 to 0.05%, S: 0.0001 to 0.01%, Ni: 5 to 15%, Cr: 15 to 30%, Mo: 0.5 to 4.0%, and N: 0.01 to 0.3%, having a balance of Fe and unavoidable impurities, satisfying Si+Mo≥1.8%, and satisfying A+B>2.5 mm/mm2 prescribing the grain boundary lengths.
Claims12
An austenitic stainless steel sheet comprising, by mass %,
- C:
- 0.0020 to 0.3000%,
- Si:
- 1.00 to 4.00%,
- Mn:
- 0.05 to 3.00%,
- Ni:
- 5.00 to 15.00%,
- Cr:
- 15.00 to 30.00%,
- Mo:
- 0.50 to 4.00%,
- N:
- 0.010 to 0.300%,
- V:
- 0.05 to 1.00%,
- Cu:
- 0.10 to 2.50%,
- Al:
- 0.002 to 0.100% or less,
- P:
- 0.05% or less,
- S:
- 0.0100% or less, and
- a balance of Fe and impurities,
- satisfying Si+Mo≥1.80%, having grain boundary lengths satisfying (formula 1):
- A+B>2.5 mm/mm2 (formula 1)
- wherein, A is the sum of general grain boundary lengths per 1 mm2 and B is the sum of Σ3 coincidence site lattice grain boundary lengths per 1 mm2.
Dependencies are inferred from the claim text.