Ultra High Chrome Casting Alloy Grinding Ball

Ultra high chrome casting alloy grinding ball Chromium composition: 15-28% Diameter(mm) Φ8 Φ10 Φ12 Φ15 Φ17 Φ20 Φ25 Φ30 Φ40 Φ50 Φ60 Φ70 Φ80 Φ90 Φ100 Φ110 Φ120 Φ130 Chemical Composition Name Designation C Si Mn Cr P S Rare earth Ultra High chrome casting grinding ball ZQCr15 2.0-3.3 ≤1.0 0.3-1.5 14-16 ≤0.08 ≤0.08 Trace ZQCr20 2.0-3.3 ≤1.0 0.3-1.5 18-22 ≤0.08 ≤0.08 Trace ZQCr26 2.0-3.3 ≤1.0 0.3-1.5 23-30 ≤0.08 ≤0.08 Trace Properties and Microstructure Name Designation Surface Hardness（HRC Core Hardness (HRC) Impact Value(J/CM2) Microstructure Time of falling balls Ultra High chrome casting grinding ball ZQCr15 ≥58 ≥56 4 M+C ≥15000 ZQCr20 ≥58 ≥56 4 M+C ≥15000 ZQCr26 ≥58 ≥56 4 M+C ≥15000 Tolerance of Diameter Diameter Φ10-Φ25 25<Φ<60 60<Φ≤100 100<Φ Tolerance of Diameter +1.0 +1.5 +2.0 +3.0 -1.0 -1.0 -1.0 -1.0