We will reply to you within 24 hours after we receive the enquiry during working days.

First of all, we have a corresponding inspection after each process, for the final product, we will do a full inspection according to customer requirements and international standards.

Yes, we can develop and produce products according to the drawings or samples provided by customers.

The core difference lies in chromium content and hardness.
Low-chrome balls feature a chromium content of 1%–3% with hardness HRC≥45, suitable for metallurgy, mining, slag treatment and other industries with low requirements on grinding precision and minor wear loss.
High-chrome balls contain chromium ≥10.0%. After heat treatment, their hardness reaches HRC≥56, ideal for working conditions with high wear resistance demands such as cement production and mineral processing.
Model selection shall be comprehensively determined based on material hardness, mill type and actual working conditions. We recommend you provide material parameters so our technical staff can work out a professional solution.

The diameter of cast grinding balls generally ranges from 12.5 mm to 130 mm.
Larger diameter balls are adopted for coarse grinding, while smaller ones for fine grinding.
The specific size selection takes feed particle size, target fineness and mill model into consideration. We offer free consultation for model matching.

The products comply with the national standard GB/T 17445 (current version GB/T 17445-2009). This standard specifies product classification, technical requirements, test methods, inspection rules, etc., for chromium alloy cast iron grinding balls and ductile iron grinding balls. It is applicable to industries including metallurgy, electric power, building materials and chemical engineering. Third-party inspection services (e.g. SGS) are available for our products.

The service life is determined by material quality, ball size and hardness, mill operating conditions, hardness of ground materials and routine maintenance. Key measures to prolong service life:
1. Adopt high-quality raw materials;
2. Maintain proper mill rotating speed and ball-to-material ratio;
3. Conduct regular inspection and maintenance;
4. Select grinding balls with hardness matching the hardness of processed materials.

Excessive wear is usually caused by improper grinding parameters, unbalanced ball-to-material ratio or insufficient chromium content. Breakage is mostly triggered by casting defects (porosity, slag inclusion, etc.) or excessive impact load.
Recommendations:
1. Adjust the rotating speed and load of the ball mill;
2. Inspect and optimize the ball feeding rate;
3. Ensure the adoption of qualified products meeting relevant standards.
4. If the problem persists, please contact our technical personnel for on-site troubleshooting.

Cast grinding balls may corrode under high-humidity or corrosive conditions. The solutions are as follows:
1. Select materials with stronger corrosion resistance;
2. Conduct regular inspection of surface conditions;
3. Improve the operating environment to avoid long-term high-humidity working conditions.

There are common deceptive practices in the current industry:
1. Passing off inferior products as premium ones: Using medium-chrome and low-chrome balls to counterfeit high-chrome balls.
2. Cutting corners on alloy composition: Controlling alloy elements only at the minimum limits specified in national standards.
3. Substandard hardness: Excessively reducing hardness to prevent ball breakage, which results in poor wear resistance.
4. Simplified production processes: Selling as-cast balls as quenched balls, or skipping tempering treatment.
5. Exaggerated performance: Wear loss indicators not verified under actual working conditions.
It is recommended to choose formal manufacturers fully equipped with testing instruments such as spectrometers and hardness testers.

Free samples are available at the early negotiation stage. We guarantee consistency between bulk order products and samples in appearance, chemical composition, hardness and other properties.
The normal production lead time for standard products is 7 to 15 working days, while customized or bulk orders take 20 to 30 days.
Small shipments are delivered by courier, large quantities via dedicated logistics lines. Third-party loading supervision can be arranged for export orders.

They are widely used in ball mills of metallurgical mining, cement & building materials, thermal power generation, flue gas desulfurization, chemical industry, coal water slurry, slag, fly ash, calcium carbonate, quartz sand and other sectors.
Cast wear-resistant steel balls serve as the core grinding medium of ball mills, known as the "grain of industry".