Chemical Components | ||||||||
Type | Chemical components | |||||||
C | Si | Mn | Cr | Mo | Cu | P | S | |
Low-Cr | 1.8-3.3 | ≤1.5 | 0.3-1.5 | 1-3 | ≤1.0 | ≤0.8 | ≤0.10 | ≤0.10 |
Medium-Cr | 1.8-3.3 | ≤1.2 | 0.3-1.5 | 4-9 | ≤1.5 | ≤0.8 | ≤0.10 | ≤0.10 |
High-Cr | 1.8-3.3 | ≤1.2 | 0.3-1.5 | 10-18 | ≤1.0 | ≤1.2 | ≤0.10 | ≤0.06 |
Superhigh-Cr | 1.8-3.3 | ≤1.2 | 0.3-1.5 | 19-30 | ≤2.0 | ≤1.2 | ≤0.10 | ≤0.06 |
Mechanical Properties and Microstructure | ||||
Type | Hardness | Falling times | Microstructure | Impact Toughness |
Low-Cr | ≥45 | ≥8000 | M+C | ≥5 |
Medium-Cr | ≥50 | ≥12000 | M+C | ≥5 |
High-Cr | ≥58 | ≥15000 | M+C | ≥5 |
Superhigh-Cr | ≥60 | ≥22000 | M+C | ≥5 |
P-Pearlite C-Carbide M-Martensite |
Nominal diameter (mm) | Weight of single ball in average (g) | Quantity/ MT | Surface hardness | Endurance impact test (Times) |
Φ15 | 13.8 | 72549 | >60 | >10000 |
Φ17 | 20.1 | 49838 | >10000 | |
Φ20 | 32.7 | 30607 | >10000 | |
Φ25 | 64 | 15671 | >10000 | |
Φ30 | 110 | 9069 | >10000 | |
Φ40 | 261 | 3826 | >10000 | |
Φ50 | 510 | 1959 | >10000 | |
Φ60 | 882 | 1134 | >10000 | |
Φ70 | 1401 | 714 | >10000 | |
Φ80 | 2091 | 478 | >58 | >10000 |
Φ90 | 2977 | 336 | >10000 | |
Φ100 | 4084 | 245 | >8000 | |
Φ120 | 7057 | 142 | >8000 | |
Φ130 | 8740 | 115 | >8000 |

Chromium content ≥10.0% are called high chromium ball, the national standard requirements of high chromium ball hardness (HRC) must be more than 58, impact value AK ≥3.0J/ 2, must use high temperature quenching + tempering treatment.
Chromium content 1-3%% are called low chromium ball.



1. Bag(1000-2000KG)
2. Drum(850-950KG)
