Grinding Lining Board for Mine

Grinding lining board is used to protect the cylinder from direct impact and friction between the grinding body and the material. At the same time, different forms of lining board can also be used to adjust the movement state of the grinding body to enhance the crushing effect of the grinding body on the material. It helps to improve the grinding efficiency of the mill, increase output and reduce metal consumption.

• Product Name: Grinding lining board for Mine
• Definition: Used to protect the cylinder
• Usage: grinder
• Hardness: ≥HRC 45 – 66
• Size: According to drawings
• Attributes: industrial products
• Size Tolerance: as per CT13
• Surface Finish: Appro.Ra100
• Machining Tolerance: +/ -0.02mm
• Material: Chrome-Moly Alloy Steel, High Cr-Mo White Iron, High Cr, High Manganese Steel, Steel
• Shape: Flat Plate, Arc Plate, Waved Plates, Corrugated Plates.
• Cast Process: Sand Cast, lost foam, Special Casting
• Production Process: Sand Process With proper heat treatment(quenching and tempering) process
• Microstructure: Bainite, Martensitic, austenite, carbides, graphite or pearlite.
• Mill Type: Cement Mill, Coal Mill, Ball Mill, Mine Mill, Rod Mill, Mining Industry, Crusher, AG/ SAG Mill, etc.
• Heat treatment Process: quenching & tempering treatment to achieve higher hardness and ideal impact value.
• The following conditions for casting will be supplied: as-cast, as-cast and stress relieved, hardened, hardened and stress relieved, or softened for machining.
  These alloys are made by melting process and shall have microstructures that consist of carbides, martensite, bainite, austenite, and in exceptional cases, minor amounts of graphite or pearlite.

1. Certificate: ISO9001, ISO14001, OHSAS18001, Material Certificates, SGS Certificate.
2. Standard: ASTM, DIN, GB, JIS, BS, EN, KS, UNI, SABS, GOST.
3. Quality Control: UT, MT, RT, PT, Chemical Analysis Report, Mechanical Property Test, etc.
4. Service: Provide customized services
5. Supply Ability: 200t/ per Month
6. Price: Discuss in Email
7. Packaging Details: Packed by strong steel pallets
8. Delivery Time: Depending on the quantity, usually 6 – 25 days after the order is confirmed.
9. Port: Ship from Shanghai Port to the customer’s designated location.
10. Specification:
    According to drawings, heat resistance, surface treatment requirement, Various type of 2D or 3D drawings are acceptable, etc.

Lining Board Main Material:

Medium carbon medium chromium Ⅰ	ZG30Cr5MoRE
Medium Carbon Medium Chromium II	ZG40Cr5MoRE
Medium carbon low alloy	ZG40CrMoNiRE
Low carbon high alloy	ZG20Cr9NiMo
Chromium-molybdenum-nickel alloy steel	ZG45Cr3NiMoMn-RE
90 chromium alloy steel	ZG90Cr6MoMn
Ordinary high strength steel	ZGMn13
Modified high manganese steel	ZGMn13Cr2
Ultra-high manganese steel	ZGMn17Cr2
Heat-resistant steel	ZG20Cr26Ni5
ASTM A297 HH	ZG20Cr26Ni12
ASTM A297 HK	ZG40Cr25Ni20
High chromium cast iron	KmTBCr15Mo2
High chromium cast iron	KmTBCr20Mo2
High chromium cast iron	KmTBCr26
High chromium cast steel	ZGCr12SiMn-GT
High chromium cast steel	ZGCr15SiMn-GT

The main considerations for selecting various linings are the lifting effect of the grinding medium, the running trajectory of the medium, and the working conditions.

Grinding Lining Board for Shot Blast Machines, Chutes, Clinker Silo,Port Machinery and Ball Mills.
Shape: Flat Plate, Arc Plate, Waved Plates, Corrugated Plates.
Bolted Plates: one-hole, two-holes, three holes, four holes, oval – hole.
Quality Level: As per National Standard & International Standards.
Service Life: 1st Chamber: about 2 years;
2nd Chamber: about 4 years.

Performance Parameters

1. The lining plate is required to have good wear resistance.
   The highly wear-resistant and impact-resistant double-medium quenched medium alloy steel lining plate produced in Anhui has scientific and reasonable alloy element formula, so that the lining plate has good physical and chemical properties, with a hardness of HRC45-55 or more, an impact toughness value of more than 25J, and a service life of More than 2 times that of high manganese steel. Able to withstand huge impact forces. The surface shape of the lining plate can be maintained for a long time during operation to ensure that the mill’s output can be stably increased by more than 5%.
2. High strength and high toughness.
   During the quenching process of the liner, a special dual-media quenching agent with good thermal stability is used as the medium, so that the product can achieve a combination of high strength, high hardness and high toughness to meet the wear-resistant process requirements.
3. High cost performance and strong adaptability. It is processed by advanced dual-media quenching process. It has the characteristics of high quenching hardness and high toughness value, making the lining plate have good wear resistance. Compared with high manganese steel lining plate, medium The alloy steel ball mill lining plate in alloy dual-media quenching shows a good cost performance. It can be adapted to wet grinding, dry grinding, mixed grinding, etc. in mines.

Materials Research

Mechanical wear involves many aspects, among which abrasive wear accounts for more than 50% of all industrial wear. Countries such as Germany and the United Kingdom lose billions of dollars every year due to abrasive wear. The Australian mining industry loses 2% of its mineral product sales every year due to abrasive wear. Among the abrasive wear, the wear of ball mill lining plate accounts for a considerable proportion.
There are two solutions: one is to improve the wear resistance of materials from the material aspect; the other is to improve the wear environment from the process aspect.

The structure and properties that lining materials should have

(1) Sufficient toughness

Lining boards with good toughness can reduce the possibility of breakage. Some people believe that in small ball mills with a diameter of less than 4m, the impact toughness of the lining plate can be used as long as it can reach ak=6~8J/cm2. However, in order to reduce the loss of non-wear failure caused by the liner being broken, we believe that the impact toughness of the 10mm×10mm×5mm unnotched sample of the liner material should be greater than 12J/cm2.

(2) Higher hardness

Studies have pointed out that after the hardness of the material after wear reaches 0.8 times the hardness of the abrasive, increasing the hardness of the material can improve the wear resistance of the material. Therefore, the hardness of the lining material should be greater than HRC50. However, too high hardness may cause the material to become more brittle, so it is recommended that the hardness should not exceed HRC54.

(3) Ideal organization

The ideal structure should include: high-hardness alloy carbides and carbide pellets. In metal materials, certain carbide-forming elements are often added to obtain high-hardness alloy carbides. This is a way to improve the wear resistance of the material. effective way. This is because the carbides are evenly distributed in the matrix, which reduces the stress concentration around the carbides, reduces the chance of crack initiation, and avoids the spalling of carbides. At the same time, the spherical carbides can block plowing wear and reduce the depth of the furrow. and length to protect the matrix. Therefore, it is required to spheroidize the alloy carbides in the material and distribute them evenly. Strong matrix, high-hard alloy carbide needs a strong matrix to support, otherwise, the alloy carbide will easily peel off, and the wear resistance of the material will be greatly weakened. Martensite + lower bainite is a very excellent matrix structure. The existence of a small amount of retained austenite reduces the stress of heat treatment, improves the toughness of the material, and reduces the possibility of cracks during production and use.

Analysis conclusion

(1) It is inappropriate to use ordinary high manganese steel ZGMn13 as a ball mill lining plate. Because the degree of work hardening of the lining plate in the ball mill is low, it cannot give full play to the wear-resistant properties of high manganese steel.
(2) After the lining material has gone through the stages of ordinary high manganese steel, reinforced high manganese steel, and alloy white iron, medium and low alloy steel lining plates have been well developed.
(3) The alloying elements added to the medium and low alloy steel lining materials mainly include Cr, Mo, V, Ti, etc., which are intended to refine the grains, promote the production of martensite, and generate high-hard carbides; and are often supplemented by With RE incubation and appropriate heat treatment, a strong martensite + lower bainite is formed with a highly hard alloy carbide pellet structure evenly distributed on it. Practice has proved that the material of this kind of organization is very good when used as ball mill lining.
(4) In order to reduce the loss of non-wear failure during the production and use of the liner, on the premise of ensuring that the material ak=6~8J/cm2, the hardness should be controlled between HRC50~54.

 

Eternal Bliss Alloy Casting & Forging Co, Ltd.

Caesar

E-mail: sales@ebcastworld.com

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