The cast steel balls for ball mill are generally divided into low chromium cast steel balls, medium chromium cast steel balls, high chromium cast steel balls, ultra-high chromium cast steel balls and multi-alloy steel balls according to the content of alloying elements added. Generally, the chromium content in 1-3% is called low chromium alloy ball, the chromium content in 5-8% is called medium chromium alloy ball, the chromium content in more than 10% is called high chromium alloy ball, and the chromium content in more than 17-26% is called ultra-high chromium ball. Under the same working conditions, the higher the chromium content, the better the wear resistance of steel balls. Because of the high price of chromium, the performance-price ratio is generally pursued, and the matched steel balls with chromium content are selected according to the ore properties of each mine.
The raw materials of cast steel ball is produced by traditional technology are cheaper and the process is simpler. With the continuous progress of society and the continuous improvement of manufacturing technology, it has developed into a fully automatic assembly line constant temperature casting process:
The grinding balls manufactured by the new automatic process have the advantages of good quality stability, small batch quality difference, good appearance of steel balls, low breakage rate, uniform hardness and low abrasion breakage rate.
二、Rainbow Ball Mill Casting Steel Balls Productivity Table
| Production Line No | Model | Line | Annual capacity(ton) | Note |
| MQ-ZZ1 | φ17-40mm | 1 | 10000 | Equipment capacity is annual production capacity, actual production according to the order quantity. If is the insufficient capacity, new production lines can be installed within 60 days to expand capacity. |
| MQ-ZZ2 | φ50-100mm | 2 | 20000 | |
| MQ-ZZ3 | φ110-150mm | 2 | 20000 | |
| MQ-ZZ4 | φ14*14mm---φ50*60mm | 1 | 10000 |
三、Rainbow Low, Medium and High Chromium Balls Material No and Chemical Composition Table
| No | Chemical composition | Casting ball specification mm | Casting specification mm | ||||||||
| c | Si | Mn | Cr | Mo | Cu | Ni | P | S | |||
| LBCr26 | 2.0-3.5 | ≤1.2 | 0.3-1.5 | 23-30 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 | ￠17-￠150 | ￠14*14--￠50*60 |
| LBCr20 | 2.0-3.5 | ≤1.2 | 0.3-1.5 | 18-23 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 | ||
| LBCr15 | 2.0-3.5 | ≤1.2 | 0.3-1.5 | 14-18 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 | ||
| LBCr10 | 2.0-3.5 | ≤1.2 | 0.3-1.5 | 10-14 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 | ||
| LBCr8 | 2.0-3.5 | ≤1.2 | 0.3-1.5 | 7-9 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 | ||
| LBCr5 | 2.0-3.5 | ≤1.2 | 0.3-1.5 | 5-8 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 | ||
| LBCr2 | 2.0-3.5 | ≤1.2 | 0.3-1.5 | 1-3 | 0-3.0 | 0-1.2 | 0-1.5 | ≤0.10 | ≤0.06 | ||
| Note | Support OEM or customize special ingredient steel balls according to customer requirements. The hardness of small straight D steel ball is higher than that of large diameter steel ball. If the hardness range is required, it can be adjusted by heat treatment process. | ||||||||||
四、Technical parameters of casting grinding ball and grinding section for mill
| Name | Model | Surface hardness（HRC） | Fatigue Life of Falling Ball Impact(times) | |
| Quench state | Non quenched state | |||
| High Chromium Cast Iron Grinding Ball | ZQCr26 | ≥56 | ≥45 | ≥8000 |
| Chromium Cast Iron Grinding Ball | ZQCr20 | ≥56 | ≥45 | ≥8000 |
| Medium Chromium Cast Iron Grinding Ball | ZQCr8 | — | ≥48 | ≥8000 |
| Low Chromium Cast Iron Grinding Ball | ZQCr2 | — | ≥45 | ≥8000 |
| Grinding Ball of Bainite Ductile Iron | ZQSi3 | ≥50 | — | ≥8000 |
| Items | Specifications | ||||||||||||||
| φ10 | φ15 | φ20 | φ25 | φ30 | φ40 | φ50 | φ60 | φ70 | φ80 | φ90 | φ100 | φ110 | φ120 | φ130 | |
| Diameter deviation | +1-0.5 | +2.0-1.0 | +3.0-1.0 | +3.5-1.5 | |||||||||||
| Maximum diameter and minimum diameter deviation | ≤1.0 | ≤2.0 | ≤3.0 | ≤4.0 | |||||||||||
五、Cast steel ball packing:
Usually, four kinds of packing methods are used, ton bag, barrel, ton bag + wooden bracket, barrel + wooden bracket.
Our company has been manufacturing and exporting casting Steel balls for many years. We have rich experience in production, inspection, transportation and export. We are willing to base our long-term cooperation on high-quality products, timely shipment and delivery, competitive prices and satisfactory services. Our goal is to be a professional supplier of high-quality wear-resistant consumables for mines in China.
