STEEL ALLOY HAVING IMPROVED CORROSION RESISTANCE UNDER HIGH-TEMPERATURE LOADING AND METHOD FOR PRODUCING STEEL STRIP FROM SAID STEEL ALLOY

摘要

The invention relates to a steel alloy having improved corrosion resistance under high-temperature loading for usage temperatures of from 300°C to 1200°C, in particular 800°C to 1200°C, having the following chemical composition in % by weight: C: > 0.01 to 1.0; AI: 3.0 to 12.0; Cr: 2.0 to 15.0; Mn: 5.0 to 30.0; Si: 0.10 to 3.0; Cu: 0.001 to 2.5; Ni: 0.001 to 5.0; S: to 0.010; P: to 0.010; N: 0.001 to 0.050; B: 0.00005 to 0.0250; Mo: 0.01 to 5.0; where: 12 < Cr + 2*AI+3*Si < 24; and at least one of the elements Ti, V and Nb with the following contents in % by weight: Ti: 0.01 to 1.0, V: 0.01 to 1.0, Nb: 0.01 to 1.0, the remainder being formed by iron with impurities caused by the melting and optional addition of at least one of the rare earth elements Y, La, Ce or the elements Hf, Sr and Zr. The invention also relates to method for producing steel strips from said steel alloy and advantageous fields of application.