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GBT K438

Chemical composition(mass fraction)(wt.%)

Chemical composition(mass fraction)(wt.%)
C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Mo(%) W(%) Co(%) B(%) Nb(%) Al(%) Ti(%) Ta(%) Other(%)
0.10-0.20 Max 0.5 Max 0.5 Max 0.015 Max 0.01 15.5-16.5 Balance 1.50-2.00 2.40-2.80 8.00-9.00 0.005-0.015 0.50-1.10 3.20-3.70 3.00-3.50 1.50-2.00 Zr:0.05-0.15