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

1.Feature:

 

1) In general, forged steel ball has high hardness: surface hardness to 55-68 HRC, volume hardness of 50-63 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.Chemical composition

 

Based on material,the forged steel balls are defined into 7 brands. And The chemical composition is shown in the following:

 

Brand	Material	C	Mn	Si	Cr	S	P	V
YB-1	50MN	0.48-0.56	0.70-1.0	0.17-0.37	≤0.25	≤0.035	≤0.035
YB-2	60MN	0.57-0.65	0.70-1.0	0.17-0.37	≤0.25	≤0.035	≤0.035
YB-3	65MN	0.60-0.70	0.90-1.20	0.17-0.37	≤0.25	≤0.035	≤0.035
YB-4	75Mn	0.72-0.92	0.17-0.37	0.17-0.37	0.4-0.6	≤0.035	≤0.035
YB-5	75MnCr	0.70-0.85	0.7-0.8	0.17-0.37	0.2-0.7	≤0.03	≤0.03
YB-6	75SiMn	0.70-0.90	0.7-1.2	0.4-0.8	≤0.25	≤0.03	≤0.03
YB-7	Wear-resistant Alloy	0.5-0.65	0.4-1.0	1.4-1.8	0.9-1.2	≤0.03	≤0.03	0.1-0.2

 

 

 

3.Hardness ofForged Steel Ball (HRC)

 

According to the theory and tests, the hardness of forged 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
YB-1	50MN	≥12	≥10000	≥56	≥48	≥56	≥40
YB-2	60MN	≥13	≥10000	≥58	≥50	≥58	≥42
YB-3	65MN	≥15	≥12000	≥60	≥50	≥60	≥42
YB-5	75MnCr	≥17	≥12000	≥60	≥52	≥60	≥50
YB-6	75SiMn	≥16	≥12000	≥60	≥50	≥60	≥48
YB-7	Wear-resistant Alloy	≥17	≥12000	≥60	≥54	≥60	≥52

 

 

 

4.Main Process of Forged Steel Ball

 

(1).Raw material

 

(2).Cutting

 

(3).Heating

 

(4).Forging

 

(5).Quenching

 

(6).Tempering

 

(7).Testing

 

(8).Qualified Products