STANDARD OF THE CHROME ALLOY CAST GRINDING BALLS IN BUILDING MATERIALS INDUSTRY (3)
3.Terms and definitions
The terms and definitions established in GB / T5611, GB / T 17445 and the following shall apply to this standard
Medium Chromium abrasion-resistant cast grinding balls
The eutectic carbides are mainly (CR, Fe)7C3 and (CR, FE)3C cast grinding balls with chromium content more than 5% and less than 10%
4.1 According to the chrome content
Based on chrome contenting, casting grinding balls can be divided into low chrome balls, medium chrome balls and high chrome balls. And there are 5 types of the grades of the balls. Same grades grinding balls can be divided into un-quenched and quenched balls.
4.2 According to the diameter
Based on the grinding balls diameter, recommending 16 types of the balls. The diameter deviation for Dia10-dia25mmm and dia30mm to dia120mm grinding balls should be accord with the requirements of CT9 and CT10 grades precious rules in GB/T6414-1999
(Table 1, unit: mm)
4.3 Representation of the brandfor the casting grinding balls
4.3.1 Using ‘ZQ’as the casting grinding balls
4.3.1 The code only shows the chrome contents and the condition of the heat treatment. A means quenched, B means un-quenched.
4.4 The code of the casting grinding balls
4.4.1The code-name of the cast grinding ball is indicated by the cast grinding ball grades plus the diameter.
4.4.2 The meanings of the symbols and numbers:
4.4.3 The example
Brand ZQCr15A, diameter 100mm casting grinding balls, marked as: ZQCr15A-100