Grinding media dia 15 high quality and high hardness grinding steel ball fpr cement plants

Specifications a) High hardness and wear resistance

b) Good even wear

c) low breaking and wear rate

d) grinding media for ball mill

1.Chemical composition:    Casted grinding ball

Item	C	Cr	Si	Mn	S	P	Cu	Mo	Hardness
Low       Chrome	1.8-3.5	1-3.5	≤1.2	≤1.5	≤0.15	≤0.15	≤0.5	≤1.0	≥45HRC
Medium Chrome	1.8-3.3	4-9	≤1.2	≤1.8	≤0.15	≤0.15	≤1.0	≤1.5	≥50HRC
High      Chrome	1.6-3.3	10-15	≤1.0	≤2.5	≤0.10	≤0.10	≤1.5	≤1.0	≥55HRC
Higher   Chrome	1.6-3.3	15-18 18-27	≤1.0	≤2.5	≤0.10	≤0.10	≤1.5	<2.0	≥60HRC

  2.

Nominal diameter-mm	Weight of single of casting ball in average -kg	Number of piece of one ton forging ball in average	impact toughness
DIA 10	0.0135	74073	≥12
DIA 15	0.0242	41322
DIA 20	0.0322	31056
DIA 25	0.063	15873
DIA 30	0.11	9091
DIA 40	0.257	3891
DIA 50	0.5	2000
DIA 60	0.867	1153
DIA 70	1.37	729
DIA 80	2.05	487
DIA 90	2.9	345
DIA 100	4	250
DIA 110	5.3	188
DIA 120	6.8	147
DIA 125	7.75	129
DIA 130	8.74	114

  3 Production Process The production of casting steel balls is to melt the waste raw material such as waste steel, waste iron with medium frequency induction furnace. In the process of melting, add suitable amount of precious metal alloys(such as Ferrochrome, ferromanganese, ferro-vanadium ) to the furnace. When the temperature of the molten iron is more than 1550°C and can meet the requirements of the technics,pour the qualified molten iron to steel moulds or steel production line moulds. The content of chrome of high chrome alloy casting steel balls is ≥10.0%, the content of carbon is 1.80%-3.20%. Since the national standards require the HRC≥58, ak≥3.0J/cm2, to up to this hardness, the high chrome balls must be quenched and tempered. After quenched and tempered, the hardness(HRC≥60) is higher, the wear-resistance is more than 2.5 times of forging balls. 4 Production Technics Raw material(waste steel,waste iron,iron alloy)factory inspection→blending→melt→composition inspection→casting→cooling and solidification→demould→clean and polish→inspection→quenching(increase hardness)→hardness inspection→tempering(eliminate stress)→inspection→warehousing