1、Chemical composition. The main classification of casting balls is to see the content of chromium (CR) Cr (GE in pinyin, actually read as Luo by Chinese people, and the falling homonym of leaves). Cr content of 1-3% is called low chromium ball, 5-8% is medium chromium ball, 10-13% is high chromium ball, 18-26% is super high chromium ball. At present, the latest standard of ball casting is Yb / t092-2019

 2、Hardness, impact, crushing rate and out of round rate are consistent with those of forging ball.

 3、Due to low price, low chromium ball is widely used in small mines at home and abroad, especially in private mines. Low chromium ball does not need to heat treatment, and its hardness is about hrc42; medium chromium ball has high cost performance ratio; high chromium ball has good wear-resistant effect and high unit price. High chromium ball is generally used by customers with hard ore. After oil quenching, the hardness of high chromium ball can reach over hrc58, so it is an excellent wear-resistant steel ball.