| 项目item | 国家标准钢丸national standard steel shot | 高质量钢丸high quality steel shot | |
| 化 学 成 份 % Chemical composition | carbon碳C | 0.85-1.20 | 0.10-0.20 |
| silicon硅Si | 0.40-1.20 | 0.10-0.35 | |
| manganese锰Mn | 0.60-1.20 | 0.35-1.50 | |
| sulfur硫S | <0.05 | <0.05 | |
| phosphorus磷P | <0.05 | <0.05 | |
| 硬度hardness | 钢丸steel shot | HRC40-50 HRC55-62 | HRC42-48 HRC48-54 |
| 密度density | 钢丸steel shot | ≥7.20 g/cm3 | 7.4g/cm3 |
| 金相组织metallographic structure | 回火马氏体或屈氏体 tempered martensite or troostite | 回火马氏体＋贝氏体 复相组织tempered martensite + bainite complex phase structure | |
| 外观appearance | 圆球形 rounded hollow grain空心颗粒﹤10% crack 裂纹颗粒<15% | 圆球形 rounded hollow grain空心颗粒﹤5％ crack裂纹颗粒<10% | |
| 筛网号sieve designation | 英寸 inch | 筛网 孔径 sieve opening | SAE J444 钢丸 steel shot | |||||||||||
| S930 | S780 | S660 | S550 | S460 | S390 | S330 | S280 | S230 | S170 | S110 | S70 | |||
| 6 | 0.132 | 3.35 | All Pass | | | | | | | | | | | |
| 7 | 0.111 | 2.80 | | All Pass | | | | | | | | | | |
| 8 | 0.0937 | 2.36 | ≥90% | | All Pass | | | | | | | | | |
| 10 | 0.0787 | 2.00 | ≥97% | ≥85% | | All Pass | All Pass | | | | | | | |
| 12 | 0.0661 | 1.70 | | ≥97% | ≥85% | | ≤5% | All Pass | | | | | | |
| 14 | 0.0555 | 1.40 | | | ≥97% | ≥85% | | ≤5% | All Pass | | | | | |
| 16 | 0.0469 | 1.18 | | | | ≥97% | ≥85% | | ≤5% | All Pass | | | | |
| 18 | 0.0394 | 1.00 | | | | | ≥96% | ≥85% | | ≤5% | All Pass | | | |
| 20 | 0.0331 | 0.850 | | | | | | ≥96% | ≥85% | | ≤10% | All Pass | | |
| 25 | 0.0280 | 0.710 | | | | | | | ≥96% | ≥85% | | ≤10% | | |
| 30 | 0.0232 | 0.600 | | | | | | | | ≥96% | ≥85% | | All Pass | |
| 35 | 0.0197 | 0.500 | | | | | | | | | ≥97% | | ≤10% | |
| 40 | 0.0165 | 0.425 | | | | | | | | | | ≥85% | | All Pass |
| 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 | 2.8 | 2.5 | 2.0 | 1.7 | 1.4 | 1.2 | 1.0 | 0.8 | 0.6 | 0.4 | 0.3 | 0.2 | ||
