Iron-chrome aluminium-alloy

Abstract

The invention relates to an iron-chrome-aluminium-alloy with a high service life, comprising (in mass %)>2-3.6% aluminium and >10-20% chromium, and other added materials, namely, 0.1-1% Si, max. 0.5% Mn, 0.01-0.2% yttrium and/or 0.01-0.2% Hf and/or 0.01-0.3% Zr, max. 0.01% Mg, max. 0.01% Ca, max. 0.08% carbon, max. 0.04% nitrogen, max. 0.04% phosphorus, max. 0.01% sulphur, max. 0.05% copper and respectively max. 0.1% molybdenum and/or tungsten and the usual manufacture-related impurities, the remainder being iron.

1 . An iron chromium aluminium alloy with long service life comprising (in % by mass)>2 to 3.6% aluminium and >10 to 20% chromium as well as additions of 0.1 to 1% Si, max. 0.5% Mn, 0.01 to 0.2% yttrium and/or 0.01 to 0.2% Hf and/or 0.01 to 0.3% Zr, max. 0.01% Mg, max. 0.01% Ca, max. 0.08% carbon, max. 0.04% nitrogen, max. 0.04% phosphorus, max. 0.01% sulphur, max. 0.05% copper and respectively max. 0.1% molybdenum and/or tungsten, as well as manufacture related impurities, the rest being iron.  
     
     
         2 . An iron chromium aluminium alloy according to  claim 1  comprising (in % by mass) 2.5 to 3.55% aluminium, 13 to 17% by mass chromium and additions of 0.1 to 0.5% Si, max. 0.5% Mn, 0.01 to 0.1% yttrium and/or 0.01 to 0.1% Hf and/or 0.01 to 0.2% Zr, max. 0.01% Mg, max. 0.01% Ca, max. 0.08% carbon, max. 0.04% nitrogen, max. 0.04% phosphorus, max. 0.01% sulphur, max. 0.05% copper and respectively max. 0.1% molybdenum and/or tungsten, as well as manufacture related impurities, the rest being iron.  
     
     
         3 . An iron chromium aluminium alloy according to  claim 1  or  2  comprising (in % by mass) 2.5 to 3.0% aluminium and 14 to 17% chromium and additions of 0.1 to 0.5% Si, max. 0.5% Mn, 0.01 to 0.08% yttrium and/or 0.01 to 0.08% Hf and/or 0.01 to 0.08% Zr, max. 0.01% Mg, max. 0.01% Ca, max. 0.08% carbon, max. 0.04% nitrogen, max. 0.04% phosphorus, max. 0.01% sulphur, max. 0.05% copper and respectively max. 0.1% molybdenum and/or tungsten, as well as manufacture related impurities, the rest being iron.  
     
     
         4 . An iron chromium aluminium alloy according to one of the claims  1  through  3 , in which one or more of the elements yttrium, hafnium or zirconium can be replaced completely or partly by (in % by mass) 0.01 to 0.1% of one or more of the elements scandium and/or titanium and/or vanadium and/or niobium and/or tantalum and/or rare earths, such as in particular lanthanum and/or cerium.  
     
     
         5 . An iron chromium aluminium alloy according to one of the claims  1  through  4 , characterized in that the carbon content is limited to 0.02%, the nitrogen content is limited to 0.01%, the phosphorus content is limited to 0.01% and the sulphur content is limited to 0.005%.  
     
     
         6 . An iron chromium aluminium alloy according to one of the claims  1  through  5 , wherein the following conditions with respect to the diameter, length and weight modification are given, if the alloy is used as wire and if the surface performance, the performance as well as the resistance are kept constant and if a material A is replaced with a material B:  
       diameter  D   B   /D   A ={cube root}{square root over (ρ B /ρ A )}length  L   A   /L   B ={cube root}{square root over (ρ B /ρ A )}weight  M   B   /M   A ={cube root}{square root over (ρ B /ρ A )}·γ B   /γ   A    
       wherein 
 D is the diameter  
 p is the specific electric resistance  
 L is the length  
 M is the weight  
 γ is the density  
 of the respective wire.  
 
     
     
         7 . Use of an iron chromium aluminium alloy according to one of the claims  1  through  6  as heat conductor in a heating element.  
     
     
         8 . Use of an iron chromium aluminium alloy according to one of the claims  1  through  6  as alloy, especially in form of a heating element, for the use in a household appliance.  
     
     
         9 . Use of an iron chromium aluminium alloy according to one of the claims  1  through  6  as alloy, especially in form of a heating element or as material for the use in the construction of furnaces.  
     
     
         10 . Use of an iron chromium aluminium alloy according to one of the claims  1  through  6  as alloy, especially in form of a foil, for the use as carrier foil of catalysts.  
     
     
         11 . Use of an iron chromium aluminium alloy according to one of the claims  1  through  6  as alloy, especially in form of wire or band, for the use as braking and starting resistance.