The wear-resistant steel plate is composed of a low-carbon steel plate and an alloy wear-resistant layer. The alloy wear-resistant layer is generally 1/3 to 1/2 of the total thickness. When working, the matrix provides comprehensive properties such as strength, toughness and plasticity against external forces, and the alloy wear layer provides wear resistance that meets the requirements of specified working conditions.
There is a metallurgical bond between the wear-resistant steel plate alloy wear-resistant layer and the substrate. Through special equipment and automatic welding process, the high hardness self-shielding alloy welding wire is uniformly welded on the substrate. The composite layer has one to two layers or even multiple layers. During the composite process, due to the different shrinkage ratio of the alloy, uniform transverse cracks appear. It is a remarkable feature of 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. 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.
Wear-resistant layer manifestations include narrow channels (2.5-3.5mm), wide channels (8-12mm), curves (S, W), etc.; mainly chromium alloys are used, and manganese, molybdenum, niobium, nickel, and boron are also added And other alloy components, the carbides in the metallographic structure are distributed in the form of fibers, and the fiber direction is perpendicular to the surface. The carbide content is 40-60%, the microhardness can reach above HV1700, and the surface hardness can reach HRC58-62.
Wear-resistant steel plates are mainly divided into three categories: general-purpose, impact-resistant and high-temperature resistant types; the total thickness of wear-resistant steel plates can reach 5.5 (2.5+3) mm as small as possible, and the thickness can reach 30 (15+15) mm; Rolling small-diameter DN200 wear-resistant pipes can be processed into wear-resistant elbows, wear-resistant tee, and wear-resistant reducer.

 

Mechanical property
Grade	Tensile strength (Mpa)	Elongation (%)(min)	Hardness (HBW)	-20℃ Impact AKv/J (min)
NM360	≥1100	12	330-390	24
NM400	≥1200	10	370-430	24
NM450	≥1250	7	420-480	24
NM500			470(min)
NM550			530(min)
NM600			570(min)