Iron-chrome-aluminum alloy

Abstract

An iron chromium aluminum alloy having a long service life and comprising (in % by mass) 4 to 8% Al and 16 to 24% Cr and additions of 0.05 to 1% Si, 0.001 to 0.5% Mn, 0.02 to 0.2% Y, 0.1 to 0.3% Zr and/or 0.02 to 0.2% Hf, 0.003 to 0.05% C, 0.0002 to 0.05% Mg, 0.0002 to 0.05% Ca, max. 0.04% N, max. 0.04% P, max. 0.01% S, max. 0.5% Cu and the usual impurities resulting from the melting process, the rest being iron.

1 .- 19 . (canceled)  
     
     
         20 . An iron chromium aluminum alloy having a long service life and comprising, in % by mass, 4 to 8% Al, 16 to 24% Cr, 0.05 to 1% Si, 0.001 to 0.5% Mn, 0.02 to 0.2% Y, 0.1 to 0.3% Zr or 0.1 to 0.3% Zr and 0.02 to 0.2% of at least one of Hf, Sc, Ti, V, Nb, Ta, La or Ce, 0.003 to 0.05% C, 0.0002 to 0.05% Mg, 0.0002 to 0.05% Ca, max. 0.04% N, max. 0.04% P, max. 0.01% S, max. 0.5% Cu and the usual impurities resulting from melting to produce the alloy, the rest being iron.  
     
     
         21 . An iron chromium aluminum alloy according to  claim 20  comprising, in % by mass, 5 to 6% Al, 18 to 22% Cr, 0.05 to 0.7% Si, 0.001 to 0.4% Mn, 0.03 to 0.1% Y, 0.15 to 0.25% Zr or 0.15 to 0.25% Zr and 0.02 to 0.15% of at least one of Hf, Sc, Ti, V, Nb, Ta, La or Ce, 0.003 to 0.03% C, 0.0002 to 0.03% Mg, 0.0002 to 0.03% Ca, max. 0.04% N, max. 0.04% P, max. 0.01% S, max. 0.5% Cu and the usual impurities resulting from melting to produce the alloy, the rest being iron.  
     
     
         22 . An iron chromium aluminum alloy according to  claim 20  comprising, in % by mass, 5 to 6% Al, 18 to 22% Cr, 0.05 to 0.7% Si, 0.001 to 0.4% Mn, 0.03 to 0.08% Y, 0.15 to 0.25% Zr or 0.15 to 0.25% Zr and 0.03 to 0.11% of at least one of Hf, Sc, Ti, V, Nb, Ta, La or Ce, 0.003 to 0.025% C, 0.0002 to 0.01% Mg, 0.0002 to 0.01% Ca, max. 0.04% N, max. 0.04% P, max. 0.01% S, max. 0.5% Cu and the usual impurities resulting from melting to produce the alloy, the rest being iron.  
     
     
         23 . An iron chromium aluminum alloy according to  claim 20 , comprising, in % by mass, 5 to 6% Al, 18 to 22% Cr, 0.05 to 0.7% Si, 0.001 to 0.4% Mn, 0.03 to 0.08% Y, 0.15 to 0.25% Zr or 0.15 to 0.25% Zr and 0.03 to 0.08% of at least one of Hf, Sc, Ti, V, Nb, Ta, La or Ce, 0.003 to 0.025% C, 0.002 to 0.01% Mg, 0.0002 to 0.01% Ca, max. 0.04% N, max. 0.04% P, max. 0.01% S, max. 0.5% Cu and the usual impurities resulting from melting to produce the alloy, the rest being iron.  
     
     
         24 . An iron chromium aluminum alloy according to  claim 20 , wherein the at least one of Hf, Sc, Ti, V, Nb, Ta, La or Ce consists of Hf and, in percent by mass, 0.01 to 0.18% of at least one of Sc, Ti, V, Nb, Ta, La, or Ce.  
     
     
         25 . An iron chromium aluminum alloy according to  claim 20 , wherein the at least one of Hf, Sc, Ti, V, Nb, Ta, La, or Ce consists of Hf and, in percent by mass, 0.02 to 0.15% of at least one of Sc, Ti, V, Nb, Ta, La, or Ce.  
     
     
         26 . An iron chromium aluminum alloy according to  claim 20 , wherein the at least one of Hf, Sc, Ti, V, Nb, Ta, La, or Ce consists of Hf and, in percent by mass, 0.02 to 0.11% of at least one of Sc, Ti, V, Nb, Ta, La or Ce.  
     
     
         27 . An iron chromium aluminum alloy according to  claim 20 , wherein the at least one of Hf, Sc, Ti, V, Nb, Ta, La, or Ce consists of, in percent by mass, 0.02 to 0.11% of at least one of Sc, Ti, V, Nb, Ta, La or Ce.  
     
     
         28 . An iron chromium aluminum alloy according to  claim 20 , wherein the at least one of Hf, Sc, Ti, V, Nb, Ta, La, or Ce consists of Hf and, in percent by mass, 0.03 to 0.07% of at least one of Sc, Ti, V, Nb, Ta, La, or Ce.  
     
     
         29 . An iron chromium aluminum alloy according to  claim 20 , wherein the at least one of Hf, Sc, Ti, V, Nb, Ta, La or Ce consists of, in percent by mass, 0.03 to 0.07% of at least one of Sc, Ti, V, Nb, Ta, La, or Ce.  
     
     
         30 . An iron chromium aluminum alloy according to  claim 20  comprising, in % by mass, max. 0.02% N, max. 0.02% P and max. 0.005% S.  
     
     
         31 . An iron chromium aluminum alloy according to  claim 20  comprising, in % by mass, max. 0.01% N, max. 0.02% P and max. 0.003% S.  
     
     
         32 . An iron chromium aluminum alloy according to  claim 20  further comprising, in % by mass, max. 0.1% Mo and/or 0.1% W.  
     
     
         33 . A method comprising, shaping an iron chromium aluminum alloy according to  claim 20 , into an electric heating element and passing an electric current through the electric heating element thereby to heat the electric heating element.  
     
     
         34 . A method comprising, shaping an iron chromium aluminum alloy according to  claim 20  into an electric heating element and by intermittently passing electric current through the heating element subjecting the heating element to a cycle comprising short heating up and cooling down periods, short holding times at a predetermined elevated temperature and short waiting times until a new heating up period starts.  
     
     
         35 . A heat conductor comprising an iron chromium aluminum alloy according to  claim 20  in a form of a film having a thickness of 20 to 100 μm.  
     
     
         36 . A heat conductor comprising an iron chromium aluminum alloy according to  claim 20  in a form of a wire having a diameter of <6 mm.  
     
     
         37 . A glass-ceramic cooktop comprising, as a heat conductor, an iron chromium aluminum alloy according to  claim 20 .  
     
     
         38 . A furnace comprising, as a heat conductor, an iron chromium aluminum alloy according to  claim 20.