Steel ball, divided into three categories: casting steel ball, forging steel ball, ductile iron ball. But now the use of ductile iron grinding ball is very little, casting ball and forging forging use is more common. But in the country, the use of casting grinding ball as a manufacturer of grinding media accounted for 90%, while the use of foreign forging ball more. Here is a look at the characteristics of the cast and forged balls:
The steel ball produced by casting smelting is called casting steel ball, which does not need smelting and casting, but it is called forging steel ball after forging. The two although only one word, but great difference.
Forged steel ball by direct heating at high temperature and then through the air hammer and other equipment for forging forming, after simple heat treatment, the chromium content of 0.1% ~ 0.5%, the carbon content is less than 1%, after the high temperature forging manufacturing, surface hardness (HRC) can reach more than 56, but due to the low hardenability of materials, quenching only through layer 15 mm or so, so the hardness of the core is generally only more than and 30 degrees, and the diameter of the steel ball is hardenability worse. Therefore, under normal circumstances, the forging steel ball is treated by water quenching.
From the wear resistance, after quenching and tempering process for Gao Geqiu (HRC = 60) with high hardness and wear resistance than forged steel ball 2.5 times higher than the. By comparison, we can see the obvious advantage of the casting ball compared to the ball. According to the scientific experiments show: forging ball ball ball casting tons of ore consumption is more than 2 times.