Wear Resistant Steel Plate refers to a special type of sheet material designed for applications under large-area wear conditions. Common wear-resistant steel plates are made by applying a certain thickness of high-hardness, excellent wear-resistant alloy layer through surfacing techniques on the surface of ordinary低碳 steel or low-alloy steel, which has good toughness and plasticity. Additionally, there are cast wear-resistant steel plates and alloy quenched wear-resistant steel plates.
Wear-resistant steel plate is composed of two parts: low-carbon steel plate and an alloy wear-resistant layer, typically accounting for 1/3 to 1/2 of the total thickness. During operation, the matrix provides strength, toughness, and plasticity to resist external forces, while the alloy wear-resistant layer supplies the wear resistance needed for the working conditions.
The wear-resistant steel plate alloy features a metallurgical bond between the wear-resistant layer and the substrate. Through the equipment, employing an automatic welding process, high-hardness self-protective alloy welding wire is uniformly welded onto the substrate. The composite layers range from one to two layers, up to multiple layers. During the composite process, due to the varying shrinkage rates of the alloys, uniform transverse cracks appear, which are a distinct characteristic of wear-resistant steel plates.
The wear-resistant layer of the alloy primarily consists of chrome alloy, supplemented with other alloy components such as manganese, molybdenum, niobium, and nickel. The carbides in the microstructure are fibrous and oriented perpendicular to the surface. The microhardness of the carbides can reach above HV1700-2000, and the surface hardness can reach HRC58-62. The alloy carbides maintain high stability at high temperatures, retaining a high level of hardness, and also exhibit excellent oxidation resistance, allowing for normal use up to 500°C.
Wear-resistant layer expressions include narrow strips (2.5-3.5mm), wide strips (8-12mm), and curves (S, W); primarily composed of chrome alloys, with additional elements of manganese, molybdenum, niobium, nickel, boron, and other alloy components. The carbides in the metallographic structure are fibrous and distributed perpendicular to the surface. Carbide content ranges from 40-60%, with micro-hardness exceeding HV1700 and surface hardness reaching HRC58-62.
Wear-resistant steel plates are mainly categorized into three types: general-purpose, impact-resistant, and high-temperature-resistant. The total thickness can range from as thin as 5.5mm (2.5+3mm) to as thick as 30mm (15+15mm). They can be rolled into wear-resistant pipes with a small diameter of DN200 and can be processed into wear-resistant elbows, tees, and reducers.
