General chemical composition :
| Carbon | 0.080 – 0.20 % |
| Silicon | 0.10 – 0.25 % |
| Mangan | 0.35 – 1.20% |
Physical properties:
| Microstructure | Martensite dan bainite. |
| Hardness | 40 – 56 HRC. |
| Density | Bigger than 7 gm/cc. |
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