C:1.30-1.45;Si:0.20-0.50;Mn:0.20-0.50;Cr:4.00-4.60;Mo:4.80-5.30;W:9.00-10.00;V:2.80-3.40;Co:4.50-5.50;P:≤0.050;S:≤0.050
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