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  • Suizhou Gaincin Machinery Co.,Ltd 
  • add: No.1704, Jinxiu River, Wenfeng, Zengdu, Suizhou, Hubei, P.R.China
  • E-mail:
  • Tel:  86-722-358 8806
  • Fax: 86-722-358 8806 x 8002
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Home > Features and Advantages of Grinding Media

Features and Advantages of Steel Grinding Balls/Rods/High Cast Chrome Balls 



Forged grinding balls Features and Advantages:

Our products range from 20mm to 150mm, 1 inch to 6 inch, and we can also offer all size of products according to clients’ demand.



1) forged grinding ball has high hardness: surface hardness to 58-65HRC, volume hardness of 57-64HRC  2) impact toughness high: impact toughness more than 12J / cm2.  3) broken rate is low: the actual broken rate is not higher than 0.5%.  4) loss of forged grinding ball round rate is low.

5) dropping test in 8m high tester for more than 20,000 times.

2.Technical Parameters:

Nominal Diameter(mm) Dimensional Tolerance(mm) Roundness %

Φ20 Φ25 Φ30 ±2 ≤2.0

Φ35 Φ40 Φ50 Φ60 Φ70 +3,-2 ≤3.0

Φ75 Φ80 Φ90 Φ100 +4,-3 ≤4.0

Φ120 Φ125 Φ130 Φ150 +5,-4 ≤5.0  

3.Inspection Process:

1) Surface quality inspection

2) Dimensional inspection

3) Low magnification analysis

4) Dye penetrant inspection

5) Metallographic test

4.Technical Process of Forged Steel Ball

1) Raw material testing

2) Mixture

3) Heating

4) Forged hot rolled

5) Heat treatment

6) Testing

7) Storage


Grinding Rods Features and Advantages:

Materials: Grinding rods can be customized according to customer's requirements.

Application: mainly used for metallurgical and mining, cement plant, thermal power, chemical industry, etc.

Characteristics:Gaincin’s starts using the automatic production line of grinding rods, which can be quenched and tempered automatically. Meanwhile, Gaincin adopts advanced temperature control equipment and heat treatment equipment, to process self-developed raw materials. 

Characteristics of Gaincin's grinding rods as follows:

High hardness, range is 45~55HRC Low bending, less than 1.5mm/m Dense microstructure , Bainite +Pearlite+Carbide Low breakage rate, more than 15000 times/ 3.5m Low unit consumption, 40% reduction compared to unprocessed round steel.

Main Performance:

Name Technology Size Materials Hardness Straigthness

Grinding Rods Patent 50mm-115mm Alloy steel 45-55HRC <1.5mm/m

Professional manufacturer and exporter of grinding rods.


High Chrome Cast Alloyed Balls Features and Advantages:

Product Quality Standard:

1.The chemical composition of the high chromium type product should conform to the below table.We can also manufacture the product with special chemical composition in accordance with the requirements of the customers.

Code Chemical Composition (Mass Fraction)

Cr C Si Mn Mo Cu V Ti P S

ZQCrG1 10-16 2.0-3.5 ≤1.0 0.5-2.5 ≤1.0 ≤1.0 ≤0.3 ≤0.15 ≤0.1 ≤0.1 ZQCrG2 16-22 ZQCrG3 22-28           

2.The nominal diameter, allowable deviation, maximum diameter, minimum diameter of the cast grinding steel ball should be in accordance with the following table.

Nominal  Diameter 20 25 30 40 50 60 70 80 90 100 Allowable Deviation of Diameter +2.0-1.0 +2.0-1.0 +3.5-1.0 Difference between the Maximum Diameter and Minimum Diameter ≤1.8 ≤2.4 ≤3.0 ≤3.6 ≤4.2 ≤4.6 3.

The high chromium type of product can be manufactured with the mechanical properties following the requirements of customers.

Code Surface Hardness(HRC) Impact Test(Ak) Impact Fatigue life(Times)

ZQCrG1 ZQCrG2 ZQCrG3  ≥58 ≥3 ≥10000   

Surface Quality:

The surface of the cast iron grinding ball is not allowed to have the casting defects such as the crack, and the obvious gas porosity, inclusion, shrinking cavity, cold shut, elephant skin, etc. Internal Quality It is not allowed to have the shrinkage cavity, shrinking porosity, gas porosity, inclusion, and other cavity defects on the section including plane pasting through the pouring gate and the ball center.  

Testing Method and Inspection Rules

1. Impact Test

2. Rockwell Hardness Test Specimen Preparation

3. Chemical Composition Inspection

4. Surface Hardness Inspection

5. Internal Quality Inspection