Creep-resistant steel

Abstract

The disclosure relates to a creep-resistant steel which having a chemical composition (values in % by weight) of: about 0.10 to 0.15 C, 8 to 13 Cr, 0.1 to 0.5 Mn, 2 to 3 Ni; at least one or both elements from the group Mo, W in a range in each case of about 0.5 to 2.0 or, if both elements are present, a maximum total of about 3.0; about 0.02 to 0.2 Nb, 0.05 to 2 Ta, 0.1 to 0.4 V, 0.005 to 2 Pd, 0.02 to 0.08 N, 0.03 to 0.15 Si; and about 80 to 120 ppm B, maximum about 100 ppm Al, maximum about 150 ppm P, maximum about 250 ppm As, maximum about 120 ppm Sn, maximum about 30 ppm Sb, maximum 50 ppm S, a remainder of the composition being iron and impurities.

1 . A creep-resistant steel, comprising:
 a chemical composition (values in % by weight) of: about 0.10 to 0.15 C, 8 to 13 Cr, 0.1 to 0.5 Mn, 2 to 3 Ni; at least one or both of the elements from the group Mo, W in each case in a range of about 0.5 to 2.0 or, if both elements are present, a maximum total of about 3.0; about 0.02 to 0.2 Nb, 0.05 to 2 Ta, 0.1 to 0.4 V, 0.005 to 2 Pd, 0.02 to 0.08 N, 0.03 to 0.15 Si; about 80 to 120 ppm B, maximum about 100 ppm Al, maximum about 150 ppm P, maximum about 250 ppm As, maximum about 120 ppm Sn, maximum about 30 ppm Sb, maximum about 50 ppm S, a remainder of the composition being iron and unavoidable impurities.   
   
   
       2 . The creep-resistant steel as claimed in  claim 1 , comprising 2.3 to 2.7% Ni. 
   
   
       3 . The creep-resistant steel as claimed in  claim 2 , comprising 2.5% Ni. 
   
   
       4 . The creep-resistant steel as claimed in  claim 1 , comprising 11 to 12% Cr. 
   
   
       5 . The creep-resistant steel as claimed in  claim 3 , comprising 11.5% Cr. 
   
   
       6 . The creep-resistant steel as claimed in  claim 1 , comprising 0.10 to 0.14% C. 
   
   
       7 . The creep-resistant steel as claimed in  claim 6 , comprising 0.12% C. 
   
   
       8 . The creep-resistant steel as claimed in  claim 1 , comprising 0.10 to 0.25% Mn. 
   
   
       9 . The creep-resistant steel as claimed in  claim 8 , comprising 0.20% Mn. 
   
   
       10 . The creep-resistant steel as claimed in  claim 1 , comprising 1.6 to 1.8% Mo or 1.6 to 1.8% W. 
   
   
       11 . The creep-resistant steel as claimed in  claim 10 , comprising 1.7% Mo or 1.7% W. 
   
   
       12 . The creep-resistant steel as claimed in  claim 1 , comprising 0.2 to 0.3% V. 
   
   
       13 . The creep-resistant steel as claimed in  claim 12 , comprising 0.25% V. 
   
   
       14 . The creep-resistant steel as claimed in  claim 1 , comprising 0.02 to 0.04% Nb. 
   
   
       15 . The creep-resistant steel as claimed in  claim 14 , comprising 0.03% Nb. 
   
   
       16 . The creep-resistant steel as claimed in  claim 1 , comprising 0.025 to 0.055% N. 
   
   
       17 . The creep-resistant steel as claimed in  claim 16 , comprising 0.04% N. 
   
   
       18 . The creep-resistant steel as claimed in  claim 1 , comprising 0.01% B. 
   
   
       19 . The creep-resistant steel as claimed in  claim 1 , comprising 0.05 to 0.1% Ta. 
   
   
       20 . The creep-resistant steel as claimed in  claim 19 , comprising 0.06% Ta. 
   
   
       21 . The creep-resistant steel as claimed in  claim 1 , comprising 0.005 to 0.1% Pd. 
   
   
       22 . The creep-resistant steel as claimed in  claim 21 , comprising 0.005 to 0.01% Pd. 
   
   
       23 . The creep-resistant steel as claimed in  claim 22 , comprising 0.005% Pd. 
   
   
       24 . The creep-resistant steel as claimed in  claim 1 , comprising <0.05% Si. 
   
   
       25 . The creep-resistant steel as claimed in  claim 1 , formed, at least in part, as a rotor of a thermal turbomachine. 
   
   
       26 . A creep-resistant steel, comprising:
 a chemical composition (values in % by weight) of:   iron; 8 to 13 Cr;   designated percentages by weight of Mn, Ni, Nb, Ta, V, N and Si;   about 0.005 to 2 Pd;   about 80 to 120 ppm B; and   at least one of Mo and W.