| Forged Steel Grinding Media Balls as Per is 12658 : 1989 |
(A) CHEMICAL COMPOSITION : The Chemical Composition of the Forged Steel Grinding Media Will Be As Per
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| EN -44 | EN -31 |
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| Carbon | 0.90 -1.20% | 0.95 -1010% |
| Manganese | 0.45 -0.70% | 0.25 -0.45% |
| Silicon | 0.30 % Max | 0.10 -0.35% |
| Sulphur | 0.06 % Max | 0.035 %Max |
| Phosphorous | 0.60 Max. | 0.35 % Max. |
| Chromium | | 1.40 -1.60 % |
(Iv) STANDARD SIZE OF GRINDING MEDIA : Balls Diameter (mm)- 100,90,80,75,70,65,60,50,40,30,25,&20
Cylpebs (mm)- 25x25, 22x22, 19x19
(V) TOLERANCE ON SIZE : VARIATION On Size : Shall Not Exceed the Following Limits :-
| SHAPE AND SIZE | TOLERANCE (MM) |
| (1) Balls For Size 50 mm & Above | +/- 3.00 |
| (2) Balls For Size 50 mm & Below | +/- 2.50 |
| (3) Cylpebs for all sizes | +/- 1.50 |
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