1. Composition and hardness
Wear-resistant composite steel plates refer to high-alloy wear-resistant layers that are composited on the substrate of ordinary steel plates by surfacing, combining the wear resistance of the wear-resistant layer with the load-bearing, deformation capacity, and weldability of the substrate. The hardness of the wear-resistant layer is generally HRC52-64.
Heat-treated wear-resistant steel plates refer to low-alloy steel plates that are quenched and hardened during rolling, or low-alloy steel plates that are heat-treated and quenched, sometimes also called tempered steel plates. The general hardness is HB360-600.

2. Wear-resistant mechanism and wear-resistant performance
The wear-resistant layer of the wear-resistant composite steel plate is a high-alloy component, and there are a large number of high-hardness alloy carbides (about HV1600) embedded in the substrate in the metallographic structure. The main anti-wear effect is carbides. Although the hardness of the wear-resistant layer is very high, the load-bearing strength is very low. In addition, the substrate is an ordinary steel plate and does not have wear resistance.
Heat-treated wear-resistant steel plates are hardened by quenching as a whole and are wear-resistant throughout. The metallographic structure is mainly martensite, which greatly improves the overall hardness and strength. The microhardness and macrohardness are basically the same.

3. Temperature adaptability
The wear-resistant layer of the wear-resistant composite steel plate is a high-alloy component, and it has a secondary hardening effect at a certain temperature. It can generally work below 650°C.
When the heat-treated wear-resistant steel plate is used at a temperature higher than 250°C, it gradually anneals and loses its hardness, which greatly reduces its wear resistance. Thermal cutting and welding processes will also cause a decrease in hardness in the heat-affected zone.

4. Reprocessing performance
When thermally cutting wear-resistant composite steel plates, plasma cutting is generally the only option. The forming is more restricted, and the bending performance is far inferior to that of heat-treated wear-resistant steel plates. The high-alloy cladding layer can basically not be machined, and welding can only be performed on the substrate.
Heat-treated wear-resistant steel plates are suitable for all cutting and blanking methods, and have good bending and forming performance. Under certain conditions, machining and welding can also be reliably achieved.

Under the same working conditions, generally speaking, the service life of wear-resistant steel plates is longer than that of wear-resistant composite steel plates.

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