What is a cast steel ball? How many types can cast steel balls be classified based on their chromium content?

In cast steel balls, chromium alloy is the main component, with poor oxidation resistance and resistance to high sulfur, diesel fuel, and seawater corrosion. Its strength and density are lower than forged steel balls, and its crushing rate is much higher than other process steel balls. According to the chromium content, cast steel balls can be divided into the following types:
1. Chromium content 1% -3%, hardness HRC ≥ 45. This standard wear-resistant steel ball is called a low chromium alloy cast ball, which is developed using medium frequency electric furnace melting, metal mold or sand mold casting. Its performance is suitable for some metallurgical mines, slag and other industries with low grinding accuracy requirements and low wear consumption.
2. The chromium content is 4% -6%, and the hardness HRC is ≥ 47. This standard is called a multi alloy ball, which has slightly higher strength and wear resistance than low chromium steel balls.
3. Medium chromium alloy cast balls with a chromium content of 7% -10% and a hardness of HRC ≥ 50 have higher performance than multi element alloy steel balls.
4. Chromium content ≥ 10% -14%, hardness HRC ≥ 58, high chromium alloy cast ball, is a wear-resistant ball with high usage rate and good wear resistance in the cement industry. It has a wide range of applications, but due to its high price and good performance, it has been replaced by forged products, resulting in a gradual decline in the market.
5. The chromium content exceeds 14%, and the hardness HRC is ≥ 58. This is a special high chromium steel ball, suitable for industries with fine grinding and high wear. Of course, its price is also quite high, and its cost-effectiveness is slightly lower than that of high chromium balls.