ASTM H21
Chemical composition(mass fraction)(wt.%)
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.26 | 0.36 | ||
| Si | 0.15 | 0.50 | ||
| Mn | 0.15 | 0.40 | ||
| P | 0.030 | |||
| S | 0.030 | |||
| Cr | 3.00 | 3.75 | ||
| Mo | ||||
| V | 0.30 | 0.60 | ||
| W | 8.50 | 10.00 | ||
| Ni＋Cu | 0.75 |
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