1.High hardness:50-65HRC
2.Low breakage:1%max
3.Roundness: 2%max
4.Surface smoothness
1.Specification
Nominal diameter(mm) | 20 | 25 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 | 130 | 140 | 150 |
Diameter deviation(mm) | +1,-1 | +2,-2 | +3,-2 | +4,-3 | +5,-4 |
circular degree(%) | <1 | <2 | <3 | <4 | <5 |
2.Chemical composition
Class | C | Si | Mn | P | S | Cr | V | Ti |
forged grinding steel balls | 3.0max | 0.17-0.37 | 0.6-1.2 | 0.035max | 0.035max | 1.50max | microscale | microscale |
3.Steel ball mechanical performance index
Steel type | Nominal diameter(mm) | Impact test AK.J/Square meters | Balls impact fatigue life times (drop times from the drop machine) | HRC |
Surface | Cores |
| 90max | 15J min | ≥12000 | ≥50 | ≥42 |
90min | | |
metallographic structure | martensite | A few bainite | Secondary carbide |
4.Technique Data(ball consumation for grinding l ton ore,
Type | Small ball mill | Medium ball mill | Large ball mill |
Φ1.2m-Φ2.5m | Φ3.2m-Φ4.5m | Φ5.2m-Φ6.5m |
Nonferrous metal | 0.55-0.65 | 0.40-0.45 | 0.35-0.45 |
Colorless metallic ore | 0.60-0.70 | 0.45-0.50 | 0.35-0.45 |
Cement grinding cement | 0.050-0.055 | 0.035-0.040 | 0.025-0.030 |
Grinding coal power plant | 0.08-0.09 | 0.07-0.08 | 0.04-0.05 |
5.Package:a.Dia .20mm-dia.150mm 1000kg per bags 24bags max for the 20foot container
b.Dia.130mm-dia. 150mm 800kg per drum 30drums max for the 20foot container
Dia. 50mm-dia .127mm 850kg per drum 28drums max for the 20footcontainer
Dia. 20mm-dia .40mm 900kg per drum 26drums max for the 20foot container
Dimensions dia 55cm*88cm Volume 0.23cubic meter tare 15 kgs/teel drum
The production process control standards: Germany TUVIS09001
forged steel grinding ball
