Medium chromium cast ball section has high cost performance in the field of ball mill wear-resistant steel balls. Many professional users and buyers like to buy medium chromium wear-resistant materials. Compared with low chromium cast balls, the wear resistance of medium chromium balls is obviously improved. Compared with high chromium balls, medium chromium balls have great advantages in price. It belongs to a kind of wear-resistant material with excellent wear resistance and price balance. Quality index of medium chromium cast ball: chromium content 5.0%-8.0%, carbon content 1.80%-3.60%, impact value AK (> 2.0J/2), national standard requires chromium ball hardness (HRC) must be more than 47. In order to ensure the quality of chromium ball, high temperature tempering treatment should be used to eliminate stress. Dark black or dark red surface of steel ball is the top grade.
二、Capacity Table of Chromium Alloy Steel Section in Rainbow
| Medium Chromium Production Line No | Medium Chromium Production Line Model | Line | Annual productivity of wear-resistant materials(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
| Model | 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 balls and section
| 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 |
| High 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 |
| Item | Specification | ||||||||||||||
| φ10 | φ15 | φ20 | φ25 | φ30 | φ40 | φ50 | φ60 | φ70 | φ80 | φ90 | φ100 | φ110 | φ120 | φ130 | |
| Diameter deviation | +1.0-0.5 | +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 Packaging
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 medium chromium 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.
