1. Brief introduction
Bimetallic composite wear-resistant steel plate is a composite wear-resistant layer board composed of up to 20-30% chromium carbide alloy bonded to a suitable steel substrate by arc welding. The material of the overlay welding layer of this laminated board is uniform, with a regular appearance. The carbides in the metallographic structure of the wear-resistant layer are distributed in fibrous form and perpendicular to the surface. The surface hardness can reach HRC63 or above. The hard alloy with high chromium carbide content is suitable for environments with extremely severe wear.
2. Application scope
(1) Metallurgical industry: chutes, fans, weighing buckets, powder selection machine blades, sliding plates, slag removal pipelines, blast furnace top hoppers.
(2) Coal industry: cone wear-resistant lining plate for bucket excavators, middle groove plate for scraper coal conveyors, feeding trough, hopper, mine lifting hopper, pipeline and chute for coal washing plants.
(3) Cement industry: scraper plate, slider, air guide cone, guide fan blade, dust removal pipeline, slag discharge tank.
(4) Power industry: fan blades, burner pipelines, stacker reclaimer hoppers, bin liners, coal mill liners, coal powder conveying pipes, coal powder distributor grids, chutes, coal unloading equipment liners.
(5) Glass industry: Fan impellers, fan blades, rear plate liners, fan ports, and easily worn components.
(6) Mining tunnel industry: shield machine cutterhead, coal mining machine cutting teeth, crusher, shield machine spiral reamer, excavator bucket teeth, etc.
(7) Building materials industry: screw conveyor reamers, mud pump pipelines, belong to abrasive wear, and are in contact with workpieces that come into contact with concrete slurry.
Bimetallic composite wear-resistant steel plates have been widely used in the heavy industry field, providing important wear-resistant protection measures for the wear and failure of industrial equipment and workpieces in China, greatly improving the service life of equipment and workpieces, and making important contributions to improving production efficiency and reducing production costs for enterprises. Double metal laminated wear-resistant steel plate is a fully automatic welding process that uses open arc self-protection to weld a layer of high alloy wear-resistant layer with high hardness and wear resistance on the surface of ordinary steel plate or stainless steel plate. This wear-resistant steel plate has bimetallic properties, namely high wear resistance of the working layer and high plasticity and toughness of the substrate layer, providing convenient mechanical and welding rod connection conditions for industrial applications. It can achieve processing such as rolling, welding, plasma cutting, and mechanical connection.
3. Production process
The surfacing process adopts the most advanced open arc welding technology currently available, which has minimal impact on the various properties of the substrate, while maximizing wear resistance. Composite wear-resistant steel plate is a wear-resistant layer mainly composed of Cr7C3 carbides with a volume fraction of over 50% formed on ordinary steel plates (Q235 (A3) or heat-resistant steel plates (15CrMo, 12Cr! MoV, etc.) and stainless steel plates. It has high wear resistance, impact resistance, deformability, and weldability, and can be directly processed into engineering components like steel plates, such as curling deformation, cutting, and punching, to meet the needs of industrial and mining use due to wear and tear. Compared with many wear-resistant materials, wear-resistant composite steel plates have significant and irreplaceable characteristics.
4. Advantages of use
(1) Improve economic efficiency: reduce downtime, increase equipment operation rate, improve equipment operation rate, reduce downtime maintenance losses, increase production capacity, and increase efficiency
(2) Reduce production costs: repair costs, reduce wear and tear, reduce equipment capacity and increase power consumption losses, reduce the number of workers, long-term benefits from a single investment, high cost-effectiveness;
(3) Improve production environment: greatly reduce wear, damage, and material falling that pollute the environment, avoid dripping and dripping, promote environmental protection, and facilitate factory cleaning;
(4) Protecting workers' health: reducing working hours in harsh environments, minimizing high-altitude and confined space operations, and lowering work intensity
(5) Significant social benefits: greatly reducing the use of ordinary steel plate materials, technological progress brings comprehensive social benefits.
The thickness of the wear-resistant layer on the wear-resistant steel plate is 3-12mm, and the hardness of the wear-resistant layer can reach HRC60-67. The wear resistance is 15-20 times higher than that of ordinary steel plates, 5-10 times higher than that of low-alloy steel plates, and 2-5 times higher than that of high chromium cast iron. The wear resistance is much higher than that of spray welding and thermal spraying methods.
5. Performance Description
(1) Excellent wear resistance
The chemical composition of the alloy wear-resistant layer contains 4-5% carbon and 25-30% chromium. The volume fraction of Cr7C3 carbides in its metallographic structure is over 50%, and the macroscopic hardness is HRC56-62. The hardness of chromium carbide is HV1400-1800. Due to the perpendicular distribution of carbides in the direction of wear, even compared with casting alloys of the same composition and hardness, the wear resistance is more than doubled. The comparison of wear resistance with several typical materials is as follows:
Compared to low-carbon steel; 20~25:1
Compared to as cast high chromium cast iron; 1.5~2.5:1
(2) Good impact resistance:
The substrate of wear-resistant composite steel plate is low carbon steel or low alloy. Stainless steel and other tough materials demonstrate the superiority of bimetallic materials. The wear-resistant layer resists the wear of the wear medium, and the substrate bears the load of the medium, thus having good impact resistance. Can withstand impacts and wear from high drop hoppers in material conveying systems.
(3) Good heat resistance:
The alloy wear-resistant layer is recommended to be used under working conditions of ≤ 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 temperature for use is as follows:
It is recommended to use ordinary carbon steel substrates under working conditions not exceeding 380 ;
Low alloy heat-resistant steel plates (15CrMo, 12Cr1MOV, etc.) are recommended for use under working conditions not exceeding 540 ;
It is recommended to use heat-resistant stainless steel substrates under working conditions not exceeding 800 .
(4) Good corrosion resistance
The alloy layer of wear-resistant composite steel plate contains a high percentage of metallic chromium, so it has certain rust and corrosion resistance. Used in occasions such as coal chutes and funnels, it can prevent coal sticking.
(5) Complete variety and specifications
Wear resistant steel plates come in a wide range of specifications and varieties, and have become a commodity series. The thickness of the wear-resistant alloy layer is between 3-20mm. The thinnest thickness of composite steel plate is 6mm, with no limit on thickness. At present, standard wear-resistant steel plates are available in sizes of 1200 or 1450 × 2000mm, and can also be customized and processed according to user requirements based on drawing dimensions. Wear resistant steel plates are currently divided into three types: ordinary type, impact resistant type, and high-temperature type. When ordering high-temperature wear-resistant and impact resistant composite steel plates, please provide instructions.
(6) Convenient processing performance
Wear resistant steel plates can be cut, bent or curled, welded and punched, and can be processed into various components that ordinary steel plates can process. The cut wear-resistant steel plate can be assembled and welded into various engineering structural components or parts.
(7) Function and Features
Weldable and with good wear resistance.
