Specifications

1.Chrome Grinding Ball Dia17-150MM
2.Even hardness
3.Grinding resistant
4.High impact value
5.High combined efficiency

 

Low Chrome and Middle Chrome Cast Ball

 

1.Features of Cast Grinding Balls

1) In general, casting grinding ball has high hardness: surface hardness to 55-68 HRC, volume hardness of 53-63 HRC

2) impact toughness high: impact toughness more than 12 J / cm2.

3) broken rate is low: the actual broken rate is not higher than 1%. 

4) loss of grinding forged steel ball round rate is low

 

2.Material and Chemical Composition of Casting Grinding Ball

Name	Model	Material	C	Si	Mn	Cr	S	P
TITLE-8	High Chrome	Cr-22-32%	2.0-2.8	≤1.0	0.5-2.0	22-32	≤0.06	≤0.08
TITLE-9		Cr-17-22%	2.0-2.8	≤1.0	0.5-2.0	17-22	≤0.06	≤0.08
TITLE-10		Cr-14-17%	2.2-3.0	≤1.0	0.5-2.0	15-17	≤0.06	≤0.08
TITLE-11		Cr-10-14%	2.2-3.2	≤1.0	0.5-2.5	11-14	≤0.06	≤0.08
TITLE-12	Medium Chrome	Cr-5-10%	2.1-3.2	≤1.2	0.5-1.5	5-10	≤0.06	≤0.08
TITLE-13	Low Chrome	Cr-1.0-5%	2.2-3.5	≤1.2	0.5-1.5	1.5-3	≤0.06	≤0.08

 

3.Physical Property of Casting Grinding Ball

Model	Hardness(HRC)		Impact Test(Ak.J/cm2)	Endurance Test Times(5m)	Microstructure
	Quenching	Unquenching
High Chrome	≥60	≥50	≥4	≥12000	M+C
Medium Chrome	-	≥48	≥3	≥10000	P+C
Low Chrome	-	≥46	≥2	≥8000	P+C

 

4. Specification of Cast Grinding Balls

Nominal Diameter		Diameter Tolerance	Weight of Single Ball In Average	Numbers of Per Ton Ball In Average
(mm)	(Inch)	(mm)	(g)
20	0.75’’	+2 -1	32	31250
25	1’’		64	15625
30	1.25”		110	9090
40	1.5’’		263	3802
50	2’’		513	1949
60	2.5’’	+3 -2	888	1126
70	2.75		1410	709
80	3.25’’		2104	475
90	3.5’’		2996	333
100	4’’		4110	243
110	4.5’’	+4 -2	5457	182
120	4.75’’		7102	140
130	5’’		9030	110
140	5.5’’	+4 -3	11278	88
150	6’’		13871	72

 

5.High chrome cast balls
Size: 20mm-120mm

Hardness:HRC58-65; Chrome content:11-14%

6.Low chrome cast balls
Size: 20mm-120mm
Hardness:HRC45-55; Chrome content:1-3.5%

 

7.Main Process of Casting Grinding Balls

(1)Raw material (2)Scientific Proportioning (3)Electric Furnace Smelting (4)Assay Before Furnace (5)Mould Forming (6)Polishing (7)Heat Treatment (8)Qualified Products (9)Packing

 

8.Applied Field

1)Cement Plants 2)Mines 3)Power stations 4)Chemical Industries 5)Grinding Mill, Ball mill, Coal mill

 

9. Products Name

Forged Steel Ball, Forging Steel Ball, Forged Grinding Ball, Forging Grinding Ball, Forged Ball, Forging Ball, Forged Grinding Steel Ball, Forged Steel Grinding Ball, Cast Grinding Ball, Casting Grinding Ball, Casted Grinding Ball, Cast Iron Ball, Casting Ball, Cast Ball, Casted Ball, High Chrome Cast Ball, High Chrome Casting Ball, High Chrome Cast Grinding Ball, High Chrome Cast Iron Ball, High Chrome Ball, Low Chrome Cast Ball, Low Chrome Casting Ball, Low Chrome Cast Grinding Ball, Low Chrome Cast Iron Ball, Low Chrome Ball, Medium chrome cast grinding ball, Medium Chrome Casting Ball, Medium Chrome Cast Grinding Ball, Medium Chrome Cast Iron Ball, Medium Chrome Ball,Grinding Ball, Steel Ball, Grinding Steel Ball, Steel Grinding Ball, , Grinding Media, Grinding Media Steel Ball, Cement Mill Grinding Media, Special Steel Grinding Media Mill Ball, Forged steel Ball and Casting Iron Ball For Metal Mining, High Chrome Cast Grinding Ball Manufacturer, Middle Chrome Casting Iron Ball, Casting Steel Ball,Grinding Media Ball, Low Chrome and Middle Chrome Cast Ball

 

10.Technological Characters of Cast Steel Ball

(1)Chemical Composition Matching 

The best configuration of various alloying elements can combine the ball's hardness and toughness at their best. 

(2)Melting and Pouring Process

All cast steel balls are produced by intermediate frequency electric furnace. The purity and stability of materials are     effectively ensured after uniform temperature conditioning and twice hot metal purification.

(3)Temperature Control Process

Our techinical workers duly master the proper pouring temperature, mold temperature, so that the products achieve a  good state of body tissue during the transition from liquid to solid states.

(4)Moulding Process

Pouring when the molten iron temperature reaches 1500°c. In this way, the ball can achieve internal organization of grain refinement and be more dense. Meanwhile, the carbide is radially arranged, and such carbide is embedded in the matrix again during grinding process, so forming hard layer. Thus, it greatly improves the toughness and hardness of the grinding balls.

(5)Heat Treatment Process

We have two sets of heat treatment production line. One is oil quenching, and another is air quenching. The steel grinding balls has the characters of high hardness, good toughness, low wear rate, low break rate etc.  through tempering.