| 摘要 |
A steel alloy with excellent creep strength and corrosion resistance that is ferritic at usage temperatures above 620° C. has the following chemical composition (in wt. %): C≰1.0%; Si≰1.0%; Mn≰1.0%; P max. 0.05%; S max. 0.01%; 2≰Al≰12%; 3≰Cr≰16%; 2≰Ni≰10% and/or 2≰Co≰10%, where 2≰Ni+Co≰[% Cr]+2.07×[% Al]>=0.95×([% Ni]+[% Co]); N max. 0.0200%. The remainder is iron with steel production-related impurities. Optionally, one or more elements of V, Ti, Ta, Zr, Nb, Mo and W, as well as one or more elements of Hf, B, Se, Y, Te, Sb, La and Zr with a cumulative content of <0.1% can be added. The steel structure includes uniformly distributed coherent precipitates based on a chromium-stabilized (Ni, Co) Al-B2 intermetallic ordered phase.
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