In the popular sense, the steel balls are divided into three categories: cast steel balls, forged steel balls, and ball-sanded balls. However, very few ductile iron balls are used today, and casting balls and forged balls are more commonly used. However, in China, 90% of the manufacturers use casting grinding balls as grinding media, while forging balls are used more often in foreign countries. Let's take a look at the characteristics of each of the cast and forged balls:
Forged steel balls are heated by direct high temperature and then forged by air hammers. After a simple heat treatment, the chromium content is 0.1% to 0.5%, carbon content is less than 1.0%, and the surface hardness after high temperature forging (HRC) can reach ≥56 or more, but due to poor material hardenability, harden layer is only about 15, so the hardness of the core is generally only 30 degrees, and the greater the diameter of the steel ball, the harder the hardenability. Therefore, forged steel balls are quenched under normal conditions.
In terms of wear resistance, the quenched and tempered high-chromium balls (HRC ≥ 60) have higher hardness and 2.5 times more wear resistance than forged steel balls. By comparison, the obvious advantages of a cast ball compared to a forged ball can be seen. According to scientific tests, the tonnage of a ton ball is more than twice that of a cast ball.
The open source wear-resisting adopts fully automated heat treatment
Mr. Steven