C:0.04-0.10;Si:≤0.50;Mn:0.30-0.60;Cr:1.90-2.60;Mo:0.90-1.30;W:1.50-2.00;V:0.20-0.30;Nb:0.02-0.08;B:0.0005-0.006;P:≤0.020;S:≤0.010
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