Grinding bodies

Grinding balls are the main component in the technological process of grinding materials in the production of cement, electricity, glass, silicate products, in the extraction of concentrate for the production of metals.

There are several ways to produce steel balls: by forging, stamping and rolling in screw calibers. The method of rolling steel balls on ball rolling mills is one of the most modern production methods and in comparison with casting and forging has a number of significant advantages. The production of steel balls by forging or casting is inefficient (mainly manual production) and is accompanied by a significant loss of metal (during casting, on the rim during forging). The method of obtaining steel balls by cross-rolling from a round billet is economical. It is characterized by high productivity in the production of steel balls due to the possibility of implementation on continuous automated units, which allows 2-8 times to increase productivity and 10-15% to reduce metal consumption. In addition, the steel balls produced in this way are of high quality and relatively low cost of manufacture.

Our products meet the highest requirements of the consumer. Thanks to the carefully selected heat treatment mode and the steel grade, the balls have low wear rates. Obtaining an equilibrium, single-phase structure of the ball increases operational properties, such as resistance to abrasion and splitting.

BASIC INFORMATION ABOUT GRINDING BALLS

 

Nominal diameter, mm	Nominal diameter, mm	Limit deviations from the nominal diameter, mm	Estimated nominal surface area, cm2	Estimated nominal volume, cm3	Estimated nominal weight, kg	Number of balls in 1 ton, pcs
25	25,0	±1,0	19,62	8,18	0,064	15625
30	31,5	±2,0	31,15	16,4	0,128	7812
40	41,5	±2,0	54,07	37,4	0,294	3401
50	52,0	±3,0	84,90	74,0	0,58	1724
60	62,0	±3,0	120,70	125	0,98	1020
70	73,0	±3,0	167,33	204	1,60	625
80	83,0	±3,0	216,31	299	2,35	425
90	94,0	±4,0	277,45	435	3,41	293
100	104,0	±4,0	339,62	589	4,62	216
120	125,0	±5,0	490,63	1023	8,03	124

 

Note. The calculation of the surface area and volume of the balls is made according to their nominal diameters. When calculating the mass, the density of steel was assumed to be 7.85 g/cm3. 

Balls are made of 2-4 hardness groups (all diameters), 5 hardness groups (30 and 40 diameter) according to GOST 7524-89 from round rolled products of leading domestic and foreign manufacturers. Due to the same hardness over the entire surface of the ball, as well as due to the high hardness over the entire cross-section, the balls wear out evenly and slowly, maintaining their shape during operation.

TECHNICAL CHARACTERISTICS OF STEEL GRINDING BALLS

Diameter of the ball, mm	Hardness Group	Surface hardness, HRC/HB	Hardness at ½ radius, HRC/HB	Volumetric hardness, HRC/HB	C	Mn	Si	P	S	Cr
25	III   IV	55/534	- -  45/415	-	0,60-0,70	0,50-0,80	0,17 - 0,37	Up to 0,035	Up to 0,040	Up to 0,025
30,40	III IV V	55/534 55/534 65/653	- 45/415 -	- - 64/640	0,60-0,70	0,50-1,20	0,17 - 0,37	Up to 0,035	Up to 0,040	Up to 0,025
50,60, 70	III IV	55/534	- 45/415	-	0,60-0,70	0,50-0,80	0,17-0,37	Up to 0,035	Up to 0,040	Up to 0,025
80	III IV	52/495	- 40/352	-	0,60-0,70	0,50-1,20	0,17 - 0,37	Up to 0,035	Up to 0,040	Up to 0,025
90,100	III IV	52/495	- 40/352	-	0,60-0,70	0,90-1,20	0,17 - 0,37	Up to 0,035	Up to 0,035	Up to 0,025
120	III IV	50/477	- 35/321	-	0,60-0,90	0,80-1,20	0,17 - 0,37	Up to 0,035	Up to 0,035	Up to 0,025

Packing of grinding balls: products are shipped in big bags of 1-1.5 tons.; in bulk; at the request of the customer in metal barrels, wooden boxes and in bulk with shelter under shields.