Middle chrome grinding ball

RTZQCr7

RTZQCr7 – Middle chrome grinding ball

Chemical Composition

Chemical Composition
C Si Mn Cr Mo Cu Ni Nb Ti Zr V B P S
Multi-ball I 1.8-3.2 0.5-1.5 0.3-1.5 3.2-7.0 ≤0. 5 ≤0. 8 ≤0. 5 ≤0. 2 ≤0. 5 ≤0. 5 ≤0. 5 ≤0.1 ≤0.15 ≤0. 1
Multi-ball II 1.8-3.2 0.5-1.5 0.3-1.5 7.0-10 ≤0. 5 ≤0. 5 ≤0. 5 ≤0. 2 ≤0. 5 ≤0. 5 ≤0. 5 ≤0.1 ≤0.15 ≤0. 1

 

Properties and Microstructure

Designation (HRC)Hardness Ak(J/cm2) Microstructure Time of Falling Balls
 Multi-ball I 48-56 ≥2.0 P+C ≥18000
 Multi-ball II 50-62 ≥2.5 M+C ≥18000