GBT K438
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 |