The Grinding mill liners from casting parts are manufactured by high quality material, such as hard chromium steel, high manganese steel, alloy cast iron, rubber and magnetic liners. High manganese steel material has good impact toughness, and it can become harder and wearable when subjected to a certain impact. Therefore, high manganese material is widely used on ball mill liners. There are several different shapes of mill liners to meet the needs in different situations. Generally, it can be divided into two types of liner, smooth and unsmooth. The smooth liner is suitable for fine grinding because of the larger sliding of the steel ball and strong grinding and stripping. The unsmooth liner can bring the steel ball to the higher place, have greater impact force, and strong agitation to the steel ball and the ore, so it is suitable for the coarse grinding.