Delivery Time:7-45days according to your quantity.
Certification:ISO 9001:2008,ISO14001
High Impact Toughness DIA 80mm Forged Steel Grinding Balls for mining 

Feature:
1) High Hardness: The surface hardness of forged and rolling balls is to 60-65 HRC and volume hardness is to 60-63 HRC
2) High Impact Toughness: The impact toughness is more than 12 J/cm2;
3) Low Broken Rate: The actual broken rate is not higher than 1%;
4) Even Wear-resistance: The loss of ball round rate is 50-300 g/ton.

The production process of the forged grinding balls
1). Raw material:
All the material is qualified with certificate and made in the Chinese largest steel production enterprise.
2). Different steel specifications ccording to the clients's requirements.
Main Steel Material :C45 Steel;60Mn Steel;B2 Steel
3). Steel Cutting:
the steel bars should be cut into small pieces according to the size of steel balls required by the order.
4). Heating:
we use the electric furnace instead of the traditional coal stove, the biggest advantage is that all the steel bars can accept the most approriate temperature during the heating progress. It affect the hardness and toughness directly.
5). Hammer forging:
The raw material is forged to a certain deformation by the air hammer, when the compression ratio increased, the micro-structure become more compact so that the hardness and the toughness can be improved.
6). Heat treatment:
Both the water quenching heat treatment production line and our own temperature control technics are important.
We have mature production technicians responsible for the heat treatment process as we know this process affect the grinding balls performance directly.
7). Quality Control.
Raw material test before production
Hardness test Drop Test Impact Test Core pulling Test after production
SGS test before delivery
Certificate: ISO 9001:2008

Chemical Compositionof forged steel grinding ball
Materials	C	Mn	Si	Cr	S	P
45#	0.42-0.50	0.5-0.8	0.17-0.37	0.25	≤0.030	≤0.030
50Mn	0.48-0.56	0.70-1.0	0.17-0.37	≤0.25	≤0.035	≤0.035
60Mn	0.57-0.65	0.70-1.0	0.17-0.37	≤0.25	≤0.035	≤0.035
65Mn	0.60-0.70	0.90-1.2	0.17-0.37	≤0.25	≤0.035	≤0.035
75MnCr	0.70-0.85	0.7-0.8	0.17-0.37	0.20-0.60	≤0.030	≤0.030

Ball diameter	Diameter tolerance	Weight of single ball in average	Number of piece of one ton ball in average	Surface hardness	Core hardness	Impact toughness
(mm)	(mm)	(g)	(pcs)	(HRC)	(HRC)	(J/cm2)
Φ20	+2,-1	32	31250	60-67	57-62	≥12
Φ25	+2,-1	64	15625	60-67	57-62	≥12
Φ30	+2,-1	110	9090	60-67	57-62	≥12
Φ40	+2,-1	263	3802	60-67	57-62	≥12
Φ50	+2,-1	513	1949	60-67	57-62	≥12
Φ60	+3,-2	888	1126	58-65	50-56	≥12
Φ70	+3,-2	1410	709	58-65	50-56	≥12
Φ80	+3,-2	2104	475	58-65	50-56	≥12
Φ90	+3,-2	2996	333	58-65	50-56	≥12
Φ100	+3,-2	4110	243	58-65	50-56	≥12
Φ110	+4,-2	5457	182	55-63	48-55	≥12
Φ120	+4,-2	7102	140	55-63	48-55	≥12
Φ130	+4,-2	9030	110	55-63	48-55	≥12
Φ140	+4,-2	11278	88