ASTM P21
Chemical composition(mass fraction)(wt.%)
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.18 | 0.22 | ||
| Si | 0.20 | 0.40 | ||
| Mn | 0.20 | 0.40 | ||
| P | 0.030 | |||
| S | 0.030 | |||
| Cr | 0.15 | 0.30 | ||
| Mo | ||||
| V | 0.15 | 0.25 | ||
| W | ||||
| Ni＋Cu | 0.75 | |||
| Ni | 3.90 | 4.25 | ||
| Al | 1.05 | 1.25 |
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