5.1 The deviate diameter of the casting grinding balls equipment should be accord to the requirements of the Table 1. 5.2 The shape deviation of the cast grinding ball shall be less than or equal to the diameter deviation of the cast grinding ball of the same size 5.3 The chemical composition of the cast grinding ball shall be in accordance with Table 2 (Table 2 ) Item C P Hi-Cr casting balls ≤0. 08 5.4 Mechanical Properties of CastingBalls 5.4.1 The surface hardness should be accordance with the table 3 (Table 3) ITEM Quenched (A) Un-quenched(B) Hi-Cr casting balls ≥50 Hi-Cr casting balls ≥48 ≥46 5.4.2 The hardness difference of a casting ball along the diameter of the center of the gate on the Cross section from the center of the gate to the center of the ball has specific requirements. For high chrome balls, the difference should be within 2 degrees; for medium and low chrome balls, the difference should be within 3 degrees. 5.4.3 The impact fatigue life of the casting grinding balls: for high chrome balls, the impact value should be equal or over 10 000 times; for medium chrome balls should be equal or over 9 000times; for low chrome balls should be equal or over than 8 000 times. 5.5 The low-power structure of the casting ball is not allowed to have cracks, shrinkage holes, shrinkage porosity, slag inclusion, porosity, segregation and other casting defects that affect the performance. 5.6 The ball breaking rate and ball consumption of the castingball shall be implemented in accordance with appendix A 5.7 The surface quality of the casting balls 5.7.1 Shrinkage holes, casting or heat treatment cracks, severe cold insulation, and wrinkled skin are not allowed 5.7.2 Surface defects allowed for casting balls shall comply with table 4 ( Table 4) SIZE Width of sand near gate( mm) (mm) Total area (mm2) 10 ≤SФ≤25 30 ≤SФ≤50 30 60 NOTE：SФ means the diameter of the ballsBrand Chemical Composition Si Mn Cr Mo Cu V Ti S ZQCr17 2. 0-3.2 0.3〜1.0 0- 4~1. 5 (1.6〜2.5) 16 〜19 0~1.0 0〜L2 0-0.3 0 〜0.15 ≤0.10 ≤0. 06 Hi-Cr casting balls ZQCr15 1.8〜3.2 0.3〜1.2 14 〜16 0-1.0 0〜1.2 0〜0.3 0-0.15 ≤0.10 ≤0. 06 Hi-Cr casting balls ZQCr12 1.8-3.2 0, 3〜1.5 11 〜14 0-1.0 0〜1.2 0-0.3 0 〜0.15 ≤0.10 ≤0. 06 Hi-Cr casting balls ZQCr8 2. 1〜3.2 0.5〜2.2 0.5〜1.5 7.0—10 0〜1.0 0-1.2 0〜0.3 0-0.15 ≤0.10 ≤0. 06 Low-Cr casting balls ZQCr2 2. 0-3- 6 0.3〜1.2 0.5 〜1.5 1.0-3.0 0-1.0 0 〜0.8 0-0.3 0〜0.15 ≤0.10 Brand Surface Hardness (HRC) ZQCrl7 ≥56 ≥48 Hi-Cr casting balls ZQCrl5 ≥56 ZQCrl2 ≥566 ≥50 Medium-Cr casting balls ZQCr8 ≥52 Low-Cr casting balls ZQCr2 — The allowable surface defect is not greater than More meat, less meat at the gate (mm) Localized Flash(mm) Holes (not the shrinkage cavity) Depth Unit area (mm2) 1.0 2.0 0.8 0.5 4 16 1.5 3,0 1.0 1, 0 6 60 ≤SФ≤90 2.0 4.0 1.0 1. 5 10 45 100≤SФ≤120 2.5 5.0 1.5 2. 0 12
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