Balls of 15 : 40 mm diam. are cast from the following UCF alloys :
- ARB – 12 with hardness of 62– 67 HRC
- ARB – 19 with hardness of 60– 66 HRC
- ARB – 42 with hardness of 62– 67 HRC
Note:Grinding balls of 50 , 60 mm diam. are cast from the alloy ARB – 11 with hardness of 60 – 65 HRC when used for second compartment .
Balls of 50 : 125 mm diam. are cast from the following UCF alloys :
- ARB – 1 7 with hardness of 58 – 63 HRC
- ARB – 22 with hardness of 60 – 64 HRC
when used in first compartment and in single compartment mills - The alloy ARB – 22 is applied where superior wear resistance is necessary.
- The superiority of ARB – 22 , compared with ARB – 17 , is mainly due to its microstructural features
- Structure refinement
- carbides volume fraction - Balls of 125 mm diam. are cast from the alloy ARB – 03 with hardness of 51 – 54 HRC.
- For wet grinding application, UCF has its own ARB – 27 with hardness higher than 63 HRC.
- ARW – 12 with hardness of 48 – 52 HRC.
- ARW – 13 with hardness of 54 – 59 HRC
- ARW – 06 with hardness of 48 – 51 HRC.
- ARW – 52 & ARW – 54 with hardness of 190 – 230 HB that will be increased gradually after being subjected to service impacts due to work hardening phenomenon up to 55 HRC.
- ARW – 27 with hardness of 52 – 57 HRC
- ARW – 81 & ARW – 84 with hardness of 55 HRC min.
- ARA – 10 with hardness of 46 – 49 HRC
- ARA – 27 with hardness of 58 HRC min.
- ARA – 19 with hardness of 59 – 63 HRC.
They are many alloys covering all temperature ranges needed for cement industry, the most famous of them are :
- ARH – 07
- ARH – 13
- ARH – 43
- ARH – 55
- ARH – 56
- ARH – 60
- ARH – 61
- ARH – 62
- ARA – 70
- ARA – 65
- ARH – 80
- ARWH – 25
- ARWH – 26
- ARWH – 28
- ARWH – 30
Some of such alloys have other alloying additives for exhibiting outstanding heat resistance.
Optimum alloy selection depends upon service conditions at customer premises.