The alloy wear-resistant layers are generally 1/3 to 1/2 of the total thickness. During use, the pipeline can resist the comprehensive performance of external force, such as strength, toughness and plasticity, and the alloy wear-resistant layer provides wear-resistant performance that meets the requirements of specified working conditions.
The alloy wear-resistant layer is mainly made of chromium alloy, and other alloy components such as manganese, molybdenum, niobium, nickel, etc. are also added. The carbides in the metallographic structure are distributed in fibrous shape, and the fiber direction is perpendicular to the surface. The microhardness of carbide can reach above HV1700-2000, and the surface hardness can reach HRC58-62. Alloy carbide has strong stability at high temperature, maintains high hardness, and also has good oxidation resistance. It can be used normally within 500°C.
The Weld Clad Tubes are mainly divided into three types: general-purpose, impact-resistant and high-temperature resistant; the total thickness of the wear-resistant steel plate can reach 8 (5+3) mm at least, and the thickest can reach 30 (15+15) mm; wear-resistant steel plate can be rolled It can manufacture wear-resistant pipes with the smallest diameter of DN200, and can be processed into wear-resistant elbows, wear-resistant tee, and wear-resistant reducing pipes.
The weld clad tubes have high wear resistance and good impact performance. It can be cut, bent, welded, etc., and can be connected with other structures by welding, plug welding, bolt connection, etc., which is time-saving and convenient in the maintenance on-site process Features.
It is widely used in metallurgy, coal, cement, electric power, glass, mining, building materials, bricks and tiles and other industries. Compared with other materials, it has a high cost performance and has been favored by more and more industries and manufacturers.
Excellent abrasion resistance
The chemical composition of the alloy wear-resistant layer has a carbon content of 4 to 5% and a chromium content of 25 to 30%. The volume fraction of Cr7C3 carbides in the metallographic structure is more than 50%. The macroscopic hardness is HRC56 to 68. The hardness is HV1400～1800. Because the carbides are distributed perpendicularly in the direction of wear, even when compared with cast alloys of the same composition and hardness, the wear resistance is more than 2 times.
The wear resistance comparison with several typical materials is as follows:
(1) Compare with low carbon steel; 20～25:1
(2) Compare with as-cast high chromium cast iron; 1.5～2.5:1
2. Good impact resistance:
The base plate of the wear-resistant composite steel plate is low carbon steel or low alloy. Tough materials such as stainless steel reflect the superiority of bimetal. The wear-resistant layer resists the wear of the wear medium, and the substrate bears the load of the medium, so it has good impact resistance. It can withstand the impact and wear of the high drop hopper in the material conveying system.
3. Better heat resistance:
Alloy wear-resistant layer is recommended to be used under ≤600℃. If vanadium, molybdenum and other alloys are added to the alloy wear-resistant layer, it can withstand high temperature wear of ≤800℃.
The recommended operating temperature is as follows:
Common carbon steel substrate is recommended to be used under the working condition of not higher than 380℃.
Low-alloy heat-resistant steel plate (15CrMo, 12Cr1MOV, etc.) substrate is recommended to be used under working conditions not higher than 540℃; The heat-resistant stainless steel substrate is recommended to be used at no higher than 800℃.
4. Good corrosion resistance
The alloy layer of the wear-resistant composite steel plate contains a high percentage of metallic chromium, so it has a certain degree of rust and corrosion resistance. It can be used to prevent coal sticking when used in coal dropping drums and hoppers.
5. Complete varieties and specifications
6. Convenient processing performance
7.Functions and features
It can be welded and have good wear resistance.
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