Features of cast steel balls:

(1) Rough surface: The pouring port is prone to flattening and deformation and loss of roundness during use, which affects the grinding effect;

(2) Internal looseness: Due to the casting molding method, the internal structure of the ball is coarse, with a high breakage rate and low impact toughness during use. The larger the ball and the larger the mill, the greater the chance of breakage;

(3) Not suitable for wet grinding: The wear resistance of cast balls depends on the chromium content. The higher the chromium content, the more wear-resistant it is. However, the characteristic of chromium is that it is easy to corrode. The higher the chromium, the easier it is to be corroded, especially the chromium in the ore. Sulfur, due to the use of chromium balls under the above wet grinding conditions, the cost will increase and the output will decrease.

Features of forged steel balls:

(1)Smooth surface: Produced by forging process, the surface has no defects, no deformation, no loss of roundness, and maintains the excellent grinding effect.

(2)Internal tightness: Because it is forged from round steel, defects caused by the process in the cast state are avoided. The internal density is high and the fineness is high, which enhances the ball’s drop resistance and impact toughness, thereby reducing the ball’s Breakage rate.

(4) Both dry and wet grinding are possible: Due to the use of high-quality alloy steel and new high-efficiency anti-wear materials independently developed by our company, the alloy elements are reasonably proportioned and rare elements are added to control the chromium content, thereby greatly improving its corrosion resistance. Improved, this steel ball is more suitable for the working conditions where mines are mostly wet grinding.

What's the difference between them？

1. Raw material comparison:

Forged steel balls: use alloy round steel produced by steel mills as raw materials, and the carbon content is below 2.0, which belongs to steel.

Casting steel balls: use scrap iron or iron pins, steel slag, etc. as raw materials, and the carbon content is above 2.0, which belongs to pig iron or cast iron.

2. Production process of steel balls

Forged steel balls: round steel-heating-forging/hot rolling-quenching-tempering, high compression ratio, tighter internal metallographic structure

Casting steel balls: molten iron-injection molding-tempering-quenching, no compression ratio

3.Applicable mill diameter

Forged steel balls: suitable for 1.5-11 meters

Casting steel balls: suitable for 1.5-3.8 meters

4. Applicable to dry and wet grinding

Forged steel balls:Both dry and wet grinding are possible, corrosion resistant.

Casting steel balls: Applicable to dry grinding, because cast iron is very susceptible to corrosion in a humid environment, which affects wear resistance

5. Hardness uniformity

Forged steel balls: Through mature heat treatment technology, the hardness of the core and the surface is almost the same, and the hardness is uniform, without a large hardness difference, and the roundness loss rate during use is extremely low.

Casting steel balls: The hardness near the pouring port is low, and the steel ball is prone to become oval during use, and uneven hardness can also cause the product to break.

6.Wear resistance

Forged steel balls: depends on hardness, metallographic structure, and rare metals such as C, Mn, Si, and Cr in the raw materials

Casting steel balls: generally use Cr content to improve hardness and wear resistance