Wear-resistant steel plate is a special plate product designed for use under large-area wear conditions. Commonly used wear-resistant steel plates are made of ordinary low carbon steel or low alloy steel with good toughness and plasticity, and a certain thickness of alloy wear-resistant layer with high hardness and excellent wear resistance is compounded on the surface by overlay welding method. In addition, there are also cast wear-resistant steel plates and alloy quenched wear-resistant steel plates.
Structural characteristics
The wear-resistant steel plate consists of two parts: mild steel plate and alloy wear-resistant layer, and the alloy wear-resistant layer is usually 1/3~1/2 of the total thickness; the substrate provides the comprehensive performance of strength, toughness and plasticity to resist external forces, and the alloy wear-resistant layer provides the wear-resistant performance to meet the requirements of the specified working conditions.
The metallurgical bond between the alloy wear-resistant layer and the substrate is a metallurgical bond. The high hardness self-protecting alloy wire is welded uniformly on the substrate by automatic welding process through special equipment, and the number of compound layers is from one to two to many layers, and the uniform transverse cracks appear during the compounding process due to the different alloy shrinkage ratio, which is the distinctive feature of the wear-resistant steel plate.
The alloy wear-resistant layer is mainly made of chromium alloy, and other alloy components such as manganese, molybdenum, niobium and nickel are also added, and the carbide in the metallographic organization is distributed in the form of fibers, and the direction of the fibers is perpendicular to the surface. The carbide microhardness can reach HV1700-2000 or more, and the surface hardness can reach HRC58-62. The alloy carbide has strong stability at high temperature, maintains high hardness, and also has good anti-oxidation performance, and is completely normal within 500℃.
Wear-resistant layer performance form narrow channel (2.5-3.5mm), wide channel (8-12mm), curve (S, W), etc.; mainly with chromium alloy, but also add manganese, molybdenum, niobium, nickel, boron and other alloy ingredients, metallographic organization of carbide is fibrous distribution, fiber direction and the surface perpendicular. Carbide content of 40-60%, microhardness can reach HV1700 or more, surface hardness can reach HRC58-62.
Wear-resistant steel plate is mainly divided into three types: general-purpose, impact-resistant and high-temperature-resistant; the total thickness of wear-resistant steel plate can reach 5.5 (2.5+3) mm at the minimum and 30 (15+15) mm at the thickest; wear-resistant steel plate can be rolled into wear-resistant pipes with a minimum diameter of DN200 and processed into wear-resistant elbows, wear-resistant tees and wear-resistant reducers.
Application range
Wear-resistant steel plate has high wear resistance and good impact performance, can be cut, bent, welded, etc. It can be connected with other structures by welding, plug welding, bolting, etc. It has the characteristics of time saving and convenience in the process of maintenance site, and is widely used in metallurgy, coal, cement, electric power, glass, mining, building materials, brick and tile industries, and has high cost performance compared with other materials, and has favored by more and more industries and manufacturers.