Iron-nickel alloy with low thermal expansion coefficient and exceptional mechanical properties

Abstract

The invention relates to creep-resistant iron-nickel alloys with a low thermal expansion coefficient that contain (in weight %) 0.008 to 0.12 C, 0.05 to 0.30% Mn, 0.05 to 0.30% Si, 0.2 to 0.9% Mo, 0.1 to 0.3% Cr, 0.03 to 0.15% Nb, a maximum content of 0.5% Co as well as a content of 36.0 to 36.5% Ni, and a balance of iron and production-related impurities. The alloys have a thermal expansion coefficient of less than 2.0×10 −6 /K in the temperature range of 20 to 100 ° C.

1 . Creep-resistant iron-nickel alloy with low thermal expansion, containing (in % by weight) in addition to 0.008 to 0.12% C, 0.05 to 0.30% Mn and 0.05 to 0.30% Si, also 0.2 to 0.9% Mo and 0.1 to 0.3% Cr and 0.03 to 0.15% Nb and max. 0.5% Co as well as 36.0 to 36.5% Ni, the remainder being iron and impurities resulting from the production process, whereby the alloy has a thermal expansion coefficient<2.0×10 −6 /K within a temperature range from 20 to 100° C.  
     
     
         2 . Alloy according to  claim 1  containing (in % by weight) 
 0.08 to 0.11% C  
 0.15 to 0.25% Cr  
 0.10 to 0.20% Mn  
 0.10 to 0.15% Si  
 0.5 to 0.7% Mo  
 0.05 to 0.09% Nb  
 max. 0.1% Co  
 36.0 to 36.5% Ni  
 the remainder being iron and impurities resulting from the production process, whereby the alloy has a thermal expansion coefficient<2.0×10 −6 /K within the temperature range from 20 to 100° C.  
 
     
     
         3 . Alloy according to  claim 1  further containing (in % by weight) 
 max. 0.002% S  
 max. 0.01% Ti  
 max. 0.2% Cu  
 max. 0.010% P  
 max. 0.01% Al  
 max. 0.003% Mg  
 
     
     
         4 . Ally according to  claim 2  whereby the alloy has a thermal expansion coefficient<1.6×10 −6 /K within the temperature range from 20 to 100° C.  
     
     
         5 . Shadow masks of screens and monitors made of the iron-nickel alloy of  claim 1 .  
     
     
         6 . Frame parts, in particular vertical frame parts, of shadow masks made of the iron-nickel alloy of  claim 1 .  
     
     
         7 . Passive components of thermal bi-metals made of the iron-nickel alloy of  claim 1 .  
     
     
         8 . Components for the production, storage and transportation of liquefied gas made of the iron-nickel alloy of  claim 1 .  
     
     
         9 . Components in the laser technology made of the iron-nickel alloy of  claim 1 .  
     
     
         10 . Lead frames made of the iron-nickel alloy of  claim 1 .  
     
     
         11 . Components for electron guns, in particular for television tubes, made of the iron-nickel alloy of  claim 1.