Steel balls according to the production process is divided into grinding steel balls, forged steel balls, casting steel balls. According to the processing materials are divided into bearing steel balls, stainless steel balls, carbon steel balls, copper bearing steel balls, alloy balls, etc. Among them, bearing steel ball is an important basic component of the industry, alloy steel ball is carbon, chromium, manganese, molybdenum and other major metal elements, and through forging, spinning, rolling and casting and other ways to generate a spherical iron alloy wear-resistant body, it is today's crushing industry mine ball, cement ball and other important components.