Item | The national standard steel | High quality steel | |
Chemical Composition | C | 0.85-1.20 | 0.85-1.0 |
Si | 0.40-1.20 | 0.70-1.0 | |
Mn | 0.60-1.20 | 0.75-1.0 | |
S | <0.05 | <0.030 | |
P | <0.05 | <0.030 | |
Hardness | Steel shot | HRC40-50 | HRC44-48 |
Density | Steel shot | ≥7.20 g/cm3 | 7.4g/cm3 |
Microstructure | Tempered martensite or troostite | Tempered martensite and bainite | |
External form | Spherical Hollow particles﹤10% | Spherical Hollow particles﹤5％ | |
