| Item | National standard steel shot | High quality steel shot | |
| Chemical composition% | C | 0.85-1.20 | 0.10-0.20 |
| Si | 0.40-1.20 | 0.10-0.35 | |
| Mn | 0.60-1.20 | 0.35-1.50 | |
| S | <0.05 | <0.05 | |
| P | <0.05 | <0.05 | |
| hardness | steel shot |
HRC40-50 HRC55-62 |
HRC42-48 HRC48-54 |
| density | steel shot | ≥7.20 g/cm3 | 7.4g/cm3 |
| metallographic structure | Tempered martensite or troostite |
tempered martensite + bainite |
|
| appearance |
round hollow grain﹤10% crack<15% |
round hollow grain﹤5％ crack <10% |
|
