Select The Quality Index Of Grinding Media Balls

High chromium ball quality index: chromium content ≥ 10.0%, carbon content between 1.80%-3.20%, national standards require high chromium ball hardness (HRC) must be ≥ 58%, impact value ak ≥ 3.0J /㎝2,

1. High chromium ball quality index: chromium content ≥10.0%, carbon content between 1.80%-3.20%, national standards require high chromium ball hardness (HRC) ≥58%, impact value must be ≥58% ak≥3.0 J/㎝2, if this hardness is reached, the high chromium ball must be quenched at high temperature + tempering treatment (the domestic high chromium ball is quenched with oil and air quenching). For example, the test (HRC) below 54 indicates that the high chromium ball has not passed Quenching treatment.

2. Medium chromium standard ball quality index: chromium content is 3.0% to 7.0%, carbon content is between 1.80%-3.20%, all called medium chromium balls, impact value ≥2.0J/㎝2, national requirements for medium balls The hardness (HRC) must be above 47. In order to ensure the quality of the steel balls, the chromium balls need to be treated with high temperature tempering (to achieve the purpose of removing heat treatment), and the surface of the steel parts is dark red. The protective products have been subjected to high temperature tempering treatment, such as steel balls. The surface is still metallic and the protective product has no high temperature tempering treatment.

3. Low chromium ball quality index: chromium content 0.5% to 2.5%, carbon content between 1.80%-3.20%, all belong to low chromium balls, the national standard requires the quality of low chromium balls (HRC) must be more than 45, Value AK≥1.5J/㎝, in order to ensure low-quality steel balls, chrome balls also need to be treated with high temperature tempering (to achieve the purpose of high temperature heating balls). For example, the steel surface is dark red. The protective products have been treated with high temperature tempering, such as balls. The surface is still metallic. The protective product has no high temperature tempering treatment.