Sieve number | inch | Screen aperture | SAEJ444steel ball | |||||||||||
S930 | S780 | S660 | S550 | S460 | S390 | S330 | S280 | S230 | S170 | S110 | S70 | |||
6 | 0.132 | 3.35 | AllPass | |||||||||||
7 | 0.111 | 2.80 | AllPass | |||||||||||
8 | 0.0937 | 2.36 | ≥90% | AllPass | ||||||||||
10 | 0.0787 | 2.00 | ≥97% | ≥85% | AllPass | AllPass | ||||||||
12 | 0.0661 | 1.70 | ≥97% | ≥85% | ≤5% | AllPass | ||||||||
14 | 0.0555 | 1.40 | ≥97% | ≥85% | ≤5% | AllPass | ||||||||
16 | 0.0469 | 1.18 | ≥97% | ≥85% | ≤5% | AllPass | ||||||||
18 | 0.0394 | 1.00 | ≥96% | ≤5% | AllPass | |||||||||
20 | 0.0331 | 0.850 | ≥85% | ≤10% | AllPass | |||||||||
25 | 0.0280 | 0.710 | ≥96% | ≥85% | ≤10% | |||||||||
30 | 0.0232 | 0.600 | ≥96% | ≥85% | ||||||||||
35 | 0.0197 | 0.500 | ≥97% | |||||||||||
40 | 0.0165 | 0.425 | ≥85% | AllPass | ||||||||||
45 | 0.0138 | 0.355 | ≥97% | ≤10% | ||||||||||
50 | 0.0117 | 0.300 | ≥80% | |||||||||||
80 | 0.007 | 0.180 | ≥90% | ≥80% | ||||||||||
120 | 0.0049 | 0.125 | ≥90% | |||||||||||
200 | 0.0029 | 0.075 | ||||||||||||
GB(unit:mm) | 2.8 | 2.5 | 2.0 | 1.7 | 1.4 | 1.2 | 1.0 | 0.8 | 0.6 | 0.4 | 0.3 | 0.2 |
Project | National standard steel shot | High quality steel shot | |
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 ball | HRC40-5HRC55-62 | HRC44-48 HRC58-62 |
Density | steel ball | ≥7.20g/cm3 | 7.4g/cm3 |
Metallographic Organization | Tempered martensite or troostite | Tempered martensite + bainite complex structure | |
Exterior | round ball hollow particles<10% Crack particles<15% | round ball hollow particles<5% Crack particles<10% |
Name | Cast steel grit | |
Chemical composition | C | 0.70— 1.2% |
Mn | 0.60— 1.2% | |
SI | 040— 1.2% | |
S | ≤0.05% | |
P | ≤0.05% | |
Average hardness(500gnuclear load assay) | ||
Hardness deviation | The maximum deviation range is 3.0HRC or 40HV | |
Metallographic Organization | Uniform tempered martensite or tempered troostite + dispersed carbide | |
The lowest density (determined by alcohol replacement method) | 7.4g/cm³ |