Highly corrosion resistant ferritic stainless steel
AssigneeNippon Steel Corporation
InventorsSusumu Takemura, Masao Onoyama, Masanobu Tsuji
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Abstract
A highly corrosion resistant ferritic stainless steel comprising; C .ltoreq. 0.015% Si .ltoreq. 0.30% Mn .ltoreq. 0.30% P .ltoreq. 0.040% S .ltoreq. 0.030% Cr : 18.00 to 25.00% Ni .ltoreq. 0.20% Cu .ltoreq. 0.20% Mo : 1.50 - 3.50% N .ltoreq. 0.015% Ti : 4 .times. (C + N)% to 0.50%, and Nb : 8 .times. (C + N)% to 1.00%, wherein Ti/Nb : 0.5 to 1.2 (Ti + Nb)/(C + N) .gtoreq. 8.0 in case of (C + N) < 0.017%, and (Ti + Nb)/(C + N) .ltoreq. 16.0 in case of (C + N) .gtoreq. 0.017% with the balance being iron and unavoidable impurities.
Claims1
A stable, highly corrosion resistant single phase ferritic stainless steel consisting essentially of the following components:
- C .ltoreq. 0.015%
- si .ltoreq. 0.30%
- Mn .ltoreq. 0.30%
- P .ltoreq. 0.040%
- s .ltoreq. 0.030%
- cr :
- 18.00 to 25.00%
- Ni .ltoreq. 0.20%
- Cu .ltoreq. 0.20%
- Mo :
- 1.50 - 3.50%
- N .ltoreq. 0.015%
- ti :
- 4 .times. (C + N)% to 0.50%, and
- Nb :
- 8 .times. (C + N)% to 1.00%, wherein
- Ti/Nb :
- 0.5 to 1.2
- (Ti + Nb)/(C + N) .gtoreq. 8.0 in case of (C + N) <
- 0.017%, and
- (Ti + Nb)/(C + N) .gtoreq. 16.0 in case of (C + N) .gtoreq. 0.017%
- with the balance being iron and unavoidable impurities.
Dependencies are inferred from the claim text.