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Specifications Medium chromium alloy casting balls Ф10 Ф12.5 Ф15 Ф17 Ф20 Ф25 Φ30 Φ40 Φ50 Φ60 Φ70 Φ80 Φ90 Φ100 Φ110 Φ120 Φ125 Φ130   Mechanical Properties Name (HRC)Hardness Impact Value (/cm2) AK microstructure falling ball Medium chromium alloy casting  balls ≥50 ≥2.5 Ｐ＋Ｃ 15000 C-carbide  P-pearlite  M-martensite   Chemical Composition Type C Si Mn Cr P S Cu Mo Ai Ni Nb Zr v Mediun chromium alloy casting balls 2.0-3.3 ≤1.2 ≤1.8 3.5-7.8 ≤0.15 0.15 trace