Creep-resistant steel
AssigneeALSTOM Technology Ltd
InventorsMohamed NAZMY, Andreas Kuenzler, Markus Staubli
Life of this patent
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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.
Claims26
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.
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.
Dependencies are inferred from the claim text.