ball mill balls for sale
Material: forged steel, cast steel, etc. (as per request)
Specification: Φ20-125mm
Application: mining industry, cement plant, power plant, etc.
Certificates: ISO9001:2015
Product Introduction
Ball mill balls are one type of grinding media for grinding mills such as cement ball mills, SAG mills, etc. ball mills. Other grinding media mainly include grinding cylpebs. The grinding balls are loaded into the hollow chamber of ball mills with the raw materials. When the ball mill runs at high speed, centrifugal force will be generated, which will cause friction between the internal grinding balls and the cylinder. The grinding balls ( usually steel balls ) will rotate with the cylinder and fall due to gravity when reaching a certain height, thereby smashing the raw materials. At the same time, the flow of the steel ball also produces a grinding effect. Under the impact force and grinding action of the steel ball, the material is effectively ground.
SINOMA Zibo offers durable steel grinding balls with a full range of types and specifications.
Advantages of grinding ball by SINOMA
High hardness
The surface hardness reaches 55HRC~65HRC, the volume hardness reaches 50-63HRC and the core hardness gradient distribution is uniform.
High toughness
The impact toughness of forged steel balls reached 12J/ c㎡, more than 3 times that of the cast ball.
Low broken rate
The crushing resistance is more than 10 times of the general casting and forging grinding ball.
Less consumption
More wear-resistant. The amount of ball that wears down a ton of ore is reduced by 20%-30%.
Types of steel grinding balls
Steel grinding balls can be divided into cast steel balls, forged steel balls, and rolled steel balls according to their production process. Generally speaking, cast steel balls are suitable for dry grinding operations, and forged steel balls are suitable for wet grinding operations.
Forged steel grinding balls
The materials used for forging steel balls are low-carbon alloy, high-manganese steel, high-chromium cast iron, and high-carbon and high-manganese alloy steel.
Advantages
The production equipment is simple, the production technology is easy to control. It is suitable for receiving orders with small batches and many specifications, and the specifications need to be adjusted frequently, and it is easy to arrange the production.
Cast steel grinding balls
Cast steel balls can be divided into low chromium cast balls, medium chromium cast balls, and high chromium cast balls according to their materials.
Advantages
The investment is low and it can be put into production quickly.
Disadvantages
The casting process has many defects, and the finished product has a high possibility of pores, blisters, and cracks, low density, small specific gravity, and poor impact toughness.
Material of grinding balls
1. Low carbon alloy steel ball
Steel balls made of low-carbon alloys have good toughness and low price, and their service life is more than double that of low-chromium cast balls under the same conditions of use.
2. High manganese steel ball
The high manganese steel has good toughness, and its main feature is that the surface can be hardened rapidly when it encounters a large impact force, and the wear resistance can be improved.
3. High chromium cast iron ball
High chromium cast iron has good wear resistance, but its toughness is relatively low, brittle, easy to break, and expensive.
4. High carbon and high manganese alloy steel balls
High carbon and high manganese alloy steel is an alloy added with elements such as chromium and molybdenum, which has the dual advantages of high hardness and good toughness.
The manufacturing process of Steel grinding balls
Casting, forging, and rolling are three methods for the production of steel grinding balls. Under the same conditions, forged and rolled steel balls perform better than cast. No matter what kind of technology is used, the production of steel balls must go through a certain amount of heating， quenching, and tempering.
Casting process
The casting process mainly includes melting-molding-separating-heat treatment.
Forging process
SINOMA adopts the latest forging method. The forging machine is used to exert pressure on the metal blank to produce plastic deformation to obtain the forging method with certain mechanical properties, shapes, and sizes. The forging ball has a dense structure and high mass density.
Automatic rotary cutting and rolling ball forging process
Steel round bars → automatic conveying → medium frequency induction furnace heating → spinning roller forging into ball → isothermal → quenching → isothermal tempering → natural cooling → index inspection → packing and storage
Hammer forging process
Steel round bars blanking → natural gas furnace heating → forging into balls → isothermal → quenching → isothermal tempering → natural cooling → index inspection → packing and storage
Why choose SINOMA
Highly Automated manufacturing process
Instead of the traditional way which is highly reliant on manual work, SINOMA introduced rotary cutting and rolling forging automatic production line.
Energy-saving and environmentally friendly
The use of advanced induction furnace heating instead of coal and natural gas saves energy and reduces pollution.
Strong comprehensive strength
We are a Chinese leading cement equipment and spares supplier with more than 20 years of experience. The comprehensive production and R&D capability provide customers with a wide range of options.
Highly customization
The steel grinding balls can be customized on the material, sizes, and manufacturing process.
workshop
parameters
diameter tolerance and roundness
| Diameter | Diameter roundness（mm） | Roundness(%) |
| 30 | ±2 | ≤2 |
| 40 | ±2 | ≤2 |
| 50 | ±2 | ≤2 |
| 60 | ±2 | ≤2 |
| 70 | +3，-2 | ≤3 |
| 80 | +3，-2 | ≤3 |
| 90 | +3，-2 | ≤3 |
| 110 | +4，-3 | ≤4 |
| 120 | +4，-3 | ≤4 |
| 125 | +4，-3 | ≤4 |
| 150 | +5，-4 | ≤5 |
Chemical composition
| Brand | C（%） | Si（%） | Mn（%） | Cr（%） | Cu（%） | Mo（%） | P（%） | S（%） | Ni(%) |
| 45# | 0.42-0.50 | 0.17-0.37 | 0.5-0.80 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| 40Mn | 0.37-0.44 | 0.17-0.37 | 0.7-1.0 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| 50Mn | 0.48-0.56 | 0.17-0.37 | 0.60-1.0 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| 60Mn | 0.57-0.65 | 0.17-0.37 | 0.70-1.0 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| 65Mn | 0.62-0.70 | 0.17-0.37 | 0.90-1.0 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| 70Mn | 0.67-0.75 | 0.17-0.37 | 0.90-1.20 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| 40Cr | 0.37-0.45 | 0.17-0.37 | 0.50-0.8 | 0.80-1.1 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| 42CrMo | 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.2 | 0-0.03 | 0.15-0.25 | 0-0.035 | 0-0.035 | 0-0.30 |
| 70Cr2 | 0.65-0.75 | 0.20-0.30 | 0.75-0.90 | 0.55-0.70 | 0-0.25 | 0-0.30 | 0-0.030 | 0-0.030 | 0-0.30 |
| 40Mn2 | 0.37-0.44 | 0.17-0.37 | 1.4-1.8 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.30 | 0-0.30 |
| 70Mn2 | 0.65-0.75 | 0.20-0.45 | 1.4-1.8 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.030 | 0-0.30 |
| B-1 | 0.52-0.65 | 0.17-0.37 | 0.60-1.2 | 0-0.25 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| B-2 | 0.70-0.80 | 0.17-0.37 | 0.70-0.80 | 0.50-0.60 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| B-3 | 0.58-0.66 | 1.2-1.6 | 0.65-0.80 | 0.70-0.90 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| B-4 | 0.60-0.65 | 1.6-1.7 | 0.7-0.8 | 0.7-0.8 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| B-6 | 0.75-0.85 | 0.2-0.40 | 0.9-1.0 | 0.85-0.95 | 0-0.25 | 0.06-0.13 | 0-0.035 | 02-0.035 | 0.06-0.13 |
| B-6A | 0.82-0.95 | 0.20-0.40 | 0.92-1.02 | 0.80-0.95 | 0-0.25 | 0.06-0.10 | 0-0.035 | 0-0.035 | 0.06-0.10 |
| B-7 | 0.35-0.40 | 0.17-0.37 | 0.7-0.8 | 0.9-1.0 | 0-0.25 | 0-0.30 | 0-0.035 | 0-0.035 | 0-0.30 |
| BU | 0.95-1.05 | 0.17-0.37 | 0.9-1.10 | 0.40-0.60 | 0-0.15 | 0-0.05 | 0-0.035 | 0-0.035 | 0-0.30 |
| Gr15 | 0.95-1.05 | 0.15-0.35 | 0.20-0.40 | 1.30-1.65 | 0-0.25 | 0-0.10 | 0-0.027 | 0-0.020 | 0-0.10 |
Technical specification
| Brand | Breakage rate | Hardness (HRC) | Impact value (J/cm²） | Drop times (times) | Microstructure |
| 45# | <1% | ≥45 | ≥12 | ≥8000 | M+C |
| 40Mn | <1% | ≥50 | ≥12 | ≥10000 | M+C |
| 50Mn | <1% | ≥55 | ≥12 | ≥10000 | M+C |
| 60Mn | <1% | ≥55 | ≥12 | ≥12000 | M+C |
| 65Mn | <1% | ≥58 | ≥12 | ≥12000 | M+C |
| 70Mn | <1% | ≥60 | ≥12 | ≥12000 | M+C |
| 40Cr | <1% | ≥55 | ≥12 | ≥12000 | M+C |
| 42CrMo | <1% | ≥55 | ≥12 | ≥12000 | M+C |
| 70Cr2 | <1% | ≥58 | ≥12 | ≥12000 | M+C |
| 40Mn2 | <1% | ≥55 | ≥12 | ≥12000 | M+C |
| 70Mn2 | <1% | ≥58 | ≥12 | ≥12000 | M+C |
| B-1 | <1% | ≥55 | ≥12 | ≥12000 | M+C |
| B-2 | <1% | ≥58 | ≥12 | ≥15000 | M+C |
| B-3 | <1% | ≥60 | ≥12 | ≥15000 | M+C |
| B-4 | <1% | ≥60 | ≥12 | ≥15000 | M+C |
| B-6 | <1% | ≥60 | ≥12 | ≥15000 | M+C |
| B-6A | <1% | ≥60 | ≥12 | ≥15000 | M+C |
| B-7 | <1% | ≥60 | ≥12 | ≥15000 | M+C |
| BU | <1% | ≥60 | ≥12 | ≥15000 | M+C |
| Gr15 | <1% | ≥60 | ≥12 | ≥15000 | M+C |
