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Specifications
1.Wear-resistant2.No breaking
3.Good hardness
4.OEM service
5. ISO9001:2008 certification
Cement Steel Grinding Balls Mining
1. Feature:
1) In general, forged steel ball has high hardness: surface hardness to 55-68 HRC, volume hardness of 50-63 HRC
2) impact toughness high: impact toughness more than 12 J / cm2.
3) broken rate is low: the actual broken rate is not higher than 1%.
4) loss of grinding forged steel ball round rate is low.
2. Chemical composition
Based on material,the forged steel balls are defined into 7 brands. And The chemical composition is shown in the following:
Brand | Material | C | Mn | Si | Cr | S | P | V |
Special-1 | 50MN | 0.48-0.56 | 0.70-1.0 | 0.17-0.37 | ≤0.25 | ≤0.035 | ≤0.035 |
|
Special-2 | 60MN | 0.57-0.65 | 0.70-1.0 | 0.17-0.37 | ≤0.25 | ≤0.035 | ≤0.035 |
|
Special-3 | 65MN | 0.60-0.70 | 0.90-1.20 | 0.17-0.37 | ≤0.25 | ≤0.035 | ≤0.035 |
|
Special-4 | 75Mn | 0.72-0.92 | 0.17-0.37 | 0.17-0.37 | 0.4-0.6 | ≤0.035 | ≤0.035 |
|
Special-5 | 75MnCr | 0.70-0.85 | 0.7-0.8 | 0.17-0.37 | 0.2-0.7 | ≤0.03 | ≤0.03 |
|
Special-6 | 75SiMn | 0.70-0.90 | 0.7-1.2 | 0.4-0.8 | ≤0.25 | ≤0.03 | ≤0.03 |
|
Special-7 | Wear-resistant Alloy | 0.5-0.65 | 0.4-1.0 | 1.4-1.8 | 0.9-1.2 | ≤0.03 | ≤0.03 | 0.1-0.2 |
3.Hardness of Forged Steel Ball (HRC)
According to the theory and tests, the hardness of forged steel ball is shown in the following:
Brand | Material | Impact Test AK.J/cm2 | Endurance Test Times(5m) | Dia 25mm-60mm | Dia 70mm-100mm | ||
Surface | Core | Surface | Core | ||||
Special-1 | 50MN | ≥12 | ≥10000 | ≥56 | ≥48 | ≥56 | ≥40 |
Special-2 | 60MN | ≥13 | ≥10000 | ≥58 | ≥50 | ≥58 | ≥42 |
Special-3 | 65MN | ≥15 | ≥12000 | ≥60 | ≥50 | ≥60 | ≥42 |
Special-5 | 75MnCr | ≥17 | ≥12000 | ≥60 | ≥52 | ≥60 | ≥50 |
Special-6 | 75SiMn | ≥16 | ≥12000 | ≥60 | ≥50 | ≥60 | ≥48 |
Special-7 | Wear-resistant Alloy | ≥17 | ≥12000 | ≥60 | ≥54 | ≥60 | ≥52 |
4.Main Process of Forged Steel Ball
.(1).Raw material
(2).Cutting
(3).Heating
(4).Forging
(5).Quenching
(6).Tempering
(7).Testing
(8).Qualified Products
(9).Packing
5.Applied Field:
1).Cement Plants,
2).Mines,
3).Power stations,
4).Chemical Industries,
5).Grinding Mill, Ball mill, Coal mill.
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