Wrought Iron Steel Grinding Ball Castings

1.High hardness and resistance 2.good wear resistance 3.unbreakble 4.high impact value 5.100 Original

 Our company is a professional manufacturer and exporter of Grinding Ball, the main products are Casting  Steel Grinding Ball as follows:

1.Feature:

 

1) In general, casting steel ball has high hardness: surface hardness to 56 HRC, volume hardness of 45-56 HRC

2) impact toughness high: impact toughness more than 4 J / cm2.

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

4) loss of grinding casting steel ball round rate is low.

 

2.Chemical composition

 

Based on material,the casting steel balls are defined into 6 brands. And The chemical composition is shown in the following:

 

Brand	Material	C	Mn	Si	Cr	S	P	Cu
high chrome ball	ZQCr26	20-2.8	0.5-2.0	≤ 1.0	22-28	≤0.06	≤0.10	0-2.0
high chrome ball	ZQCr20	2.0-2.8	0.5-2.0	≤ 1.0	18-22	≤0.06	≤0.10	0-1.2
high chrome ball	ZQCr15	2.5-3.2	0.5-2.0	≤ 1.0	10-17	≤0.06	≤0.10	0-1.0
medium chrome ball	ZQCr8	2.1-3.2	0.5-2.0	0.5-2.2	6-10	≤0.06	≤0.10	0-0.8
low chrome ball	ZQCr2	2.2-3.6	0.5-2.0	≤ 1.0	1.5-3.0	≤0.10	≤0.10	0-0.8
bainite ductiles ball	ZQSi3	3.2-3.8	2.0-3.0	2.0-3.5	-	≤0.03	≤0.10	-

3.Hardness of casting Steel Ball (HRC)

 

According to the theory and tests, the hardness casting steel ball is shown in the following:

 

Brand	Material	Impact Test AK.J/cm2	Endurance Test Times(5m)	Dia 25mm-60mm		Dia 70mm-100mm
				Surface	Core	Surface	Core
high chrome ball	ZQCr26	5	≥8000	≥56	≥45	≥56	≥45
high chrome ball	ZQCr26	5	≥8000	≥56	≥45	≥56	≥45
high chrome ball	ZQCr15	5	≥8000	≥56	≥49	≥56	≥45
midlle chrome ball	ZQCr 8	4	≥8000	≥56	≥48	≥56	≥45
low chrome ball	ZQCr2	3	≥8000	≥56	≥45	≥56	≥45
bainite ductile ball	ZQSi3	4	≥8000	≥50	-	≥50	-

4.Main Process of Forged Steel Ball

 

(1).Raw material

(2).scientic proportioning

(3).electric furnance smelting

(4).assay before furnace

(5).mould forming

(6).polishing

(7).heat treatment

(8).packing

(9).transportation