|
SPECIFICATION |
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|
Nominal diameter |
Diameter Tolerance |
Weight of single ball in average |
Surface hardness |
Impact toughness |
|
(mm) |
(mm) |
(g) |
(HRC) |
(J/cm2) |
|
Φ60 |
+3 -2 |
888 |
60-64 |
8-10 （ball mill） ≥14 （semi-autogenous mill） |
|
Φ70 |
1410 |
|||
|
Φ80 |
2104 |
|||
|
Φ90 |
2996 |
|||
|
Φ100 |
4110 |
|||
|
Φ110 |
+4 -2 |
5457 |
60-64 |
|
|
Φ120 |
7102 |
|||
|
Φ130 |
9030 |
|||
|
Φ140 |
+4 -3 |
11278 |
||
Chengde Rongmao Cast Steel Co.,Ltd. founded in 1980s, and located in historic and cultural city - Chengde China, is a large-scale casting & forging enterprise. For thirty years Rong Mao has produced Austempered Ductile Iron (ADI) grinding ball, Forged grinding balls, ball mill liner, various models of jaw crusher tooth plate, hammer crusher liner, castor-oil plant section, high-chromium alloy combined hammer and all kinds of high manganese steel castings. The company has 400 staff, including technical management personnel of 80 and 30 with senior and medium professional titles, and its plant covers an area of 36,000 square meters, with workshop area of 26,000 square meters and fixed assets of 200 million yuan. The annual output is 100,000 tons.
Rong Mao Cast Steel Co.,Ltd manufacture grinding balls, grinding media balls for mining, SAG/ball mill liner, alloy/crusher hammer, forged grinding ball in China.
According to the present situation of 9.75 4.88m SAG mill, since the grid plate hole is 60mm, so we suggest your company using 125 balls instead of original 120 ones, changing filling rate from 9-10% to 11-12%, so that it will be more effectively to increase the grinding quality and processing ore quantity. We are leading manufacturer and supplier of ADI grinding ball, austempered ductile iron grinding ball in China.
|
CHEMICAL COMPOSITION（for ball mill） |
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|
C |
Si |
Mn |
Cr |
Cu |
Mo |
S |
P |
|
|
3.5%-3.9% |
2.6-3.0% |
2.7%-2.8% |
0.7%-0.9% |
0.2%-0.5% |
0.2%-0.4% |
≤0.03% |
≤0.03% |
|
|
CHEMICAL COMPOSITION（for semi-autogenous mill） |
||||||||
|
C |
Si |
Mn |
Cr |
Ni |
Cu |
Mo |
S |
P |
|
3.5%-3.9% |
2.6-3.0% |
1.4%-1.8% |
0.3%-0.5% |
0.2%-0.4% |
0.3%-0.6% |
0.2%-0.6% |
≤0.03% |
≤0.03% |
|
MECHANICAL PROPERTIES |
||
|
Metallographic structure |
Rockwell Hardness |
Impact toughness J/cm2 |
|
B+A+C |
60-64 |
8-10（ball mill） |
Small size: Ø10mm--Ø40mm;
Medium size: Ø50mm--Ø90mm;
Big size: Ø100mm--Ø150mm.
Series of balls according to the chrome percentage:
High chrome casting ball: More than Cr:10%;
Medium chrome casting ball: Cr:3%-9%;
Low chrome Grinding ball: Cr:1%-3%.
Features of casting grinding balls
(1) High hardness: surface hardness of casting iron ball is to HRC 58-65. The tolerance of the core hardness and surface hardness is not over 2HRC;
(2) Good Impact Toughness: impact toughness of chrome balls is more than 4J/cm²;
(3) Low Broken Rate: the actual broken rate is not higher than 1%;
(4) Good Wear-resistant: the wearing rate of high cast iron ball is 30-50g/ton in cement industry, 350-430g in gold mines and even lower in some iron mines.
|
CHEMICAL COMPOSITION(%) |
|||||||||
|
Type |
C |
Si |
Mn |
Cr |
P |
S |
Mo |
Cu |
Ni |
|
ZQCr 13 |
2.0-3.2 |
0.3-1.2 |
0.3-1.5 |
11-13 |
≤0.10 |
≤0.06 |
0-1.0 |
0-0.08 |
-- |
|
ZQCr 17 |
2.0-3.0 |
0.3-1.3 |
0.3-1.5 |
15-18 |
≤0.10 |
≤0.06 |
0-1.0 |
0-0.08 |
-- |
|
ZQCr 20 |
2.0-2.8 |
0.3-1.0 |
0.3-1.5 |
18-22 |
≤0.10 |
≤0.06 |
0-1.0 |
0-0.08 |
-- |
|
ZQCr 26 |
2.0-2.8 |
0.3-1.0 |
0.3-1.5 |
22-28 |
≤0.10 |
≤0.06 |
0-1.0 |
0-0.08 |
-- |
|
HRC |
Impact toughness ak(J/cm2) |
Time of falling balls |
Microstructure |
||||||
|
58-66 |
≥4.0 |
≥15000 |
M+C |
||||||
|
M - Martensite C - Carbide |
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According to the present situation of 9.75 4.88m SAG mill, grid plate hole 60mm, and we recommended your company changed ball diameter from the original 120 to 125, filling rate from 9-10% to 11-12%, so that it is more effectively to increase the grinding quality and processing ore.
Base on the high quality raw material, the advanced automated equipment, the heat processing and the strict quality control system, we can improve the surface hardness of grinding ball up to 58-65HRC and impact toughness of grinding balls is over 12J/cm².
Features of forged grinding ball
1) High hardness: surface hardness of forged grinding balls is to HRC 58-65. The tolerance of the core hardness and surface hardness is not over 2HRC;
2) Good Impact Toughness: impact toughness of forged grinding balls is over 12J/cm²;
3) Low Broken Rate: the actual broken rate is not higher than 1%.
Three characteristics:
1.High wear and impact resistance
With scientific and reasonable formulation of alloy elements, the high manganese steel liner is multivariate micro-alloying on the basis of the original high-manganese steel, then it has good physical and chemical properties, such as the hardness HRC52-56, the impact toughness value larger than 150J, using life is more than twice as high manganese steel. So it can tolerate a huge impact strength. In a long-term work it can keep lining surface state so ensure a stable increase of more than 5% of production.
By using the special quenching medium agent with thermal stability in the quenching process, high manganese steel liners combine high strength, high hardness and high toughness perfectly, which can satisfy high wear resistance and high impact loads process requirements.
3.High cost-effective, strong adaptability
Through the reasonable alloying elements and advanced process of our company, high manganese steel liner has a high quenching hardness, high toughness characteristics. So that it not only has good wear resistance, but also shows excellent price compared with the ordinary liner. It can adapt to mine wet grinding, dry grinding, mixing mill and etc. High manganese steel liners use advanced heat treatment process and change the height of ball mill’s peak, trough. These all help improve grinding rate of ball mill and increase the 20% of machine-hour capacity.
Rong Mao is Ball mill liner, high manganese steel ball mill liner, magnetic liner, mill lining manufacturer in China.
High manganese steel ball mill liner is used to protect the direct impact and wear of grinding ball and materials. At the same time, the different shapes of high manganese steel liners are used to adjust the movement state of the mineral, thereby enhancing the efficiency of grinding and crushing, which is helpful to improve the grinding efficiency, increase the output and reduce the mental consumption.
Main applications:
High manganese steel liner can be used for ball mill, crushers, loaders, excavators, Cutting tools, bulldozers, digging bucket and knife plate, screw conveyor and other wear-resistant structural parts production equipment, by gas cutting processing and various welding, despite the steel sheet with high strength , but cold bending performance well, it can be cold forming.
Metallurgical industry: mainly used in sintering and ironmaking etc., bin liner, skip, pipes, cloth feeder and base, hopper, pipes, pump case, crusher parts, slag troughs, fans, vibrating screen;
Cement industry: the impact plate, pipe, pump case, mill liners, crusher parts, slag troughs, a variety of chassis, vibrating screen and so on.
Power industry: the ash pipe, hopper, fan blades, combustion pipelines, tanks and transport material bucket liners, crusher parts, mill parts, air handling systems and transport aircraft.
Coal industry: mainly used for coal washing and mining and mineral transport, truck cargo tank liner, bin liners, transporting tank lining, crusher unit, cover plate, wear bars and wear plates.
For the conventional ball mill liner, ore pulp and grinding media wear and impact the liner directly while in operation, along with the electrochemical corrosion at the same time.
or the conventional ball mill liner, ore pulp and grinding media wear and impact the liner directly while in operation, along with the electrochemical corrosion at the same time. But for the magnetic liner, the working principle is quite different: these magnetic liners are arranged alternately in the ball mill to form a strong magnetic field, the magnetic liner attracts a layer of broken or small steel balls and ferromagnetic minerals to the liner surface when in operation, thus forming a natural dynamic protective layer. In initial period, the workers can add broken balls or iron powder to help form the protective layer, which often can be 20~30mm. So the service life of the magnetic liner is extended greatly, is generally 10 times even dozens of times of high manganese steel liner.
Material:
Material and production process of the protective metal casing:
Our company’s researchers developed a special non-magnetic material, which consists of military special alloy metal and some necessary elements. This type material has many great properties:such as wear-resistant, acid-proof, Alkali-resistant,corrosion resistance and excellent non-magnetic permeability. All these properties enable the formation of sufficient strength and thickness of protective layer . By using EPC casting process, we produce metal casing with neat appearance and precise size, so the contact surface of the cylinder and magnetic liner can up to more than 95%.
Material of the magnetic
Based on years of experience, our company always use the the magnetic material with stable performance and reliable quality,this ensures high quality of our products, and in some vulnerable parts we add some NdFeB magnetic materials.
Material of the waterproof glue
Our company use imported waterproof glue, the strong adhesive makes the magnets and the protective layer firmly bonded together. And the good water resistance propertity makes the waterproof layer on the magnet surface have sufficient strength, not destroyed in the transportation, installation and use.
Features:
1.Long service life:
General can be used 4-6 years in the second and third stage for iron ore mining.
General can be used 2-4 years in the second and third of stage for Non-ferrous metal ore mining.
2.Light weight
The weight is 40-50% of manganese steel liner,so can reduce power consumption of the ball mill , which 7-10% lower than that of manganese steel liner.
3.Low consumption
Can reduce the grinding ball consumption for ball mill, 10% lower than that of manganese steel liner.
4.Damage prevention
Can make the ball mill does not leak ore, without wearing on bearing bush, non magnetic agglomeration.
5.Easy Installation
Installed in one day with less labor.
6.Optimal working environment
(1)Medium temperature 0-100℃ (2) Using Grinding ball ≤Ф60mm
7.Improve operation efficiency and increase throughput
Can make the ball mill grinding particle size finer than that of high manganese steel , and also can increase the capacity of the ball mill and mill operating rate increased by more than 1% .
8.Bring the enormous benefits
In the second and the third stage of ball mill using metal magnetic liner instead of high manganese steel liner, bring the enormous economic and social benefits to the enterprise.
On Oct. 26, 2016, “China National Gold Group Corporation” held a centralized procurement tender of mill liners in Beijing, which to purchase mill liners for “China Gold Inner Mongolia Mining Co.,Ltd.”.
Property and advantages
1.High wear and impact resistance
2.High strength, high toughness
3.High cost-effective, strong adaptability
Our company cooperated with some famous universities orm a scientific research team with experts and scholars, use advantage production equipment. With our many years' research on many mines' mill liners and rich experience in design , we invent multielement alloy liners, which combined hardness and impact toughness perfectly, so it is not easy broken, with long using life. This type liner is suitable for SAG mills with size not less 5m,our liners can satisfy with the high requirements by using our special heat processing, the impact toughness can be 120-150J/cm, hardness can be HRC52-58, the properties reached the international advanced level.
At present, the common hammers used in the crusher are high manganese steel hammer and forging hammer, both of these two hammerheads are with the shortage of short using cycle, not wear-resisting, high cost and low efficiency. Our company developed a new type alloy hammer: Combined the high chrome multielement alloy and medium carbon low alloy wear-resistant steel together, so the hammers are with high wear resistance and good toughness. Now our products have sold to hundreds of ore-dressing and sand plant all over the world. After long-team tracking service, Our company concluded: Our alloy Crusher hammers’ using life is almost 2-3 times longer than that of high manganese steel hammers, 3-5 times longer than that of the forged hammers. Therefore create considerable economic benefits and social benefits for the users.
Ⅰ. Product characteristics
The hammer has many advantages: the handle has good toughness, not easily broken; Rockwell hardness can be HRC 65-67, good abrasion resistance, long life and other advantages.
Ⅱ. The use of range
The product is mainly applied to the mining enterprises and gravel plant hammer crusher use.
Ⅲ. Specifications
Crusher Hammer
Matters Needing Attention
Rong Mao is a leading manufacturer of Wear Resistant Metal Alloy Steel Hammer, crusher hammer in China.