high chrome cast grinding bars

Grinding bars-High chrome

High chrome cast grinding bars

Specification

specification(mm)
¢8 ¢10 ¢12 ¢14 ¢16 ¢18 ¢20 ¢20*25 ¢25*30 ¢30*35 ¢35*40 ¢40*45

Chemical Composition

   Item Designation                    Chemical Composition
C Si Mn Cr Mo P S
Popular Grade ZQCr10 1.8-3.2 0.3-1.2 0.2-1.0 10-13 trace ≤0.10 ≤0.08
Cu Ni Nb Ti B Zr V
trace trace trace trace trace trace trac
High chrome cast grinding bars ZQCr26 2.0-3.2 ≤1.0 0.2-1.0 22-28 ≤1.0 ≤0.10 ≤0.08
ZQCr20 2.0-3.2 ≤1.0 0.2-1.0 18-22 ≤1.0 ≤0.10 ≤0.08
ZQCr17 2.0-3.2 ≤1.0 0.2-1.0 13-18 ≤1.0 ≤0.10 ≤0.08

Properties and Microstructure

Item Designation (HRC) Microstructure
Quenching state Non Quenching state
   Popular Grade ZQCr10 ≥58 ≥48 M+C
High chrome cast grinding bars ZQCr26 ≥58 ≥48
ZQCr20 ≥58 ≥48
ZQCr17 ≥58 ≥48

The bar with Chromium content ≥10.0% and carbon content between 1.80% -3.20% are high chrome cast grinding bars. Its hardness (HRC) must be above 58 degrees in national standard. In order to achieve this hardness, high chrome grinding media ball must be heat-treated hardened. At present, there are a variety of high chrome grinding media ball quenching methods such as oil quenching, wind quenching, aqueous solution, etc. If the hardness (HRC) is below 54 degrees then the ball is lack of hardness or it has not been quenched.