The difference between the steel ball and the steel ball ?
We talk about the meaning of the ball, divided into three categories: casting steel ball, forging steel ball, ball graphite cast ball. But now the use of ductile iron grinding ball is very little, and the use of casting ball and forging is more common. But in China, the choice of casting grinding ball as a grinding medium of the manufacturers accounted for 90%, while the use of more than a foreign country. What's the characteristics of the casting and forging balls:
By means of the method of casting, the steel ball is made of steel balls. The two although only one word, but great difference.
Forged steel ball by direct high temperature heating then through the air hammer equipment forging forming, again after a simple heat treatment, the chromium content is 0.1% to 0.5% containing carbon content of less than 1.0%, after high temperature forging manufacturing, surface hardness (HRC) can is more than or equal to 56 above, but because of the material quenching through poor, quenching layer is only 15 mm or so, so the core hardness generally only about 30 degrees, and the larger the diameter of ball hardenability of worse. Therefore, in normal circumstances, the steel ball is used for water quenching.
From the wear resistance, after quenching and tempering treatment of Gao geqiu (HRC is more than or equal to 60) with high hardness, wear resistance than forging steel ball higher more than 2.5 times. By comparison, it can be seen that the obvious advantages of the casting ball compared to the forging ball. According to the scientific experiments show: forging ball ball ball casting tons of ore consumption is more than 2 times.