40mm-150mm Low Chrome Casting Steel Ball For Ball Mill Castings And
Forgings
1. Ball mill steel balls castings and forgings usage
Ball mill is the key equipment for material crushing after being
crushed.
Ball mill is one of the high fine grinding machines widely used in
industrial production. There are many kinds, such as horizontal
ball mill, ball mill bearing bush, energy-saving ball mill,
overflow type ball mill, ceramic ball mill, lattice ball mill and
so on.
Ball mill is suitable for grinding all kinds of ore and other
materials, is widely used in mineral processing, building materials
and chemical industries, can be divided into dry and wet grinding
two ways. According to the different way of ore discharge, it can
be divided into two types: lattice type and overflow type.
2. Ball mill steel balls castings and forgings product parameters
(1) wear-resistant forged steel balls
| SIZES | SURFACE | CORE |
| DIA 40-60 MM | HRC60-64 | HRC59-63 |
| DIA 70-80 MM | HRC60-64 | HRC58-62 |
| DIA 90-100 MM | HRC60-64 | HRC57-61 |
| DIA 110-140 MM | HRC55-60 | HRC52-58 |
Chemical component
| C | Si | Mn | P | S | Cr |
| 0.72-0.82 | 0.17-0.37 | 0.7-0.8 | 0.035 MAX | 0.035MAX | 0.28-0.60 |
(2) New material wear-resistant forged steel balls
SIXZES: DIA 40 – 150MM
HARDNESS: HRC55-65
Chemical component
| C | Si | Mn | P | S | Cr | V |
| 0.7-0.9 | 0.45-0.75 | 0.7-1.25 | 0.04MAX | 0.04MAX | 0.11-0.4 | 0.05-0.12 |
(3) Castings and forgings steel balls product parameters
| Composition(%) | C | Si | Mn | Cr | P | S | Hardness(HRC) | Wear Rate in Gold Mine |
| Low Cr Cast Balls | 2.0~3.0 | 0.5~1.5 | ≤0.50 | 1.5~2.5 | ≤0.07 | ≤0.07 | 46~55 | About 1000g/MT |
| Mid Cr Cast Balls | 2.0~3.5 | ≤1.0 | 0.3~1.2 | 4.0~6.0 | ≤1.0 | ≤1.0 | ≥50 | About 870g/MT |
| Cr12 Cast Balls | 2.0~3.0 | ≤1.2 | 0.7~2.0 | 10~12 | ≤0.06 | ≤0.06 | ≥55 | ≤870g/MT |
| Cr15 Cast Balls | 2.0~3.0 | ≤1.2 | 0.7~2.0 | 14~16 | ≤0.06 | ≤0.06 | ≥58 |
| Cr20 Cast Balls | 2.0~3.5 | ≤1.0 | 0.5~1.5 | 17~23 | ≤0.06 | ≤0.06 | ≥60 | ≤760g/MT |
3. Use method of steel ball in ball mill(castings and forgings)
The newly installed ball mill has a running process, in the running
process, the steel ball amount added for the first time, accounted
for the ball mill maximum loading amount of 80%, the proportion of
steel ball added according to the size of the ball (φ 120 mm, φ 100
mm, φ 80 mm, φ 60 mm, φ 40 mm) size added. Different types of ball
mills have different amounts of ball. For example, the maximum ball
loading capacity of MQG1500×3000 ball mill is 9.5-10 tons. The
first time to add steel ball ball (120㎜ and 100㎜) accounted for
30%-40%, in the ball 80㎜ accounted for 40%-30%, ball (60 and 40㎜)
accounted for 30%.
Why ball mill ball in the process of ball mill in quantity only to
add 80%, because after installation of ball mill, ball mill need
mesh size, capacity are to be gradually increased, with ball mill
is normal running in two or three days in a row, pick up to check
the size of the gear meshing situation, everything is all right,
open the add the remaining 20% steel ball mill manhole covers the
second.
Note: the addition of small steel balls is only used for the first
time. Because, when the ball mill is in normal operation, the
reasonable friction between the steel ball and the steel ball, the
steel ball and the ore, the steel ball and the ball mill lining
plate will increase the abrasion, so that the large ball mill
small, medium ball mill for small ball. So normally, you don't need
to add more balls. Adding small balls is in the useful mineral
particle size without monomer separation, when the fineness of the
mill can not meet the flotation requirements, you can add
appropriate amount of small balls. The steel ball in the ball mill
is constantly wearing in the process of operation. In order to
maintain the reasonable ratio of ball load filling rate and ball,
and maintain the stable operation of the ball mill, it is necessary
to carry out reasonable ball filling and low compensation wear.
The weight of the steel ball is added according to the quality of
the steel ball and the quality of the steel ball, which determines
the amount of ore consumption. It is best to use the new
wear-resistant steel ball, such as the steel ball forged from the
train wheel hub by special treatment is especially wear-resistant.
