Microhardness and macrohardness are basically

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The wear-resistant layer of the wear-resistant composite steel plate is composed of high alloy components, and a large number of high-hardness alloy carbides (about HV1600) are embedded in the matrix metallographic structure, which are the main carbides playing a role in wear resistance. The actual microhardness of the wear-resistant layer is much higher than the measured macrohardness. Its hardening method is similar to that of carbide. NM wear-resistant steel plate is quenched and hardened as a whole, and the presence of martensite in the metallographic structure increases the overall hardness. the same. We are familiar with two materials used for cutting tools: carbide and T10. Even if the macroscopic hardness of T12 hardened steel and carbide are basically the same, the wear resistance of carbide is much higher than that of T12 steel. The reason is that the hard alloy contains a large amount of carbides, so the wear resistance of the wear-resistant composite steel plate is better than that of the NM wear-resistant steel plate.

(3) Temperature resistance

NM wear-resistant steel plate gradually loses its hardness after annealing at a temperature above 250, resulting in a significant decrease in wear resistance. The welding process can also australia number data cause a decrease in hardness near the weld; The wear-resistant layer of the wear-resistant composite steel plate is made of high alloy steel and has a secondary hardening effect at a certain temperature. Generally, it can work at a temperature below 650.

(4) Drilling method

NM wear-resistant steel plates can be drilled by mechanical methods, and it is recommended to use high-speed steel (HSS-E) or high-speed steel containing cobalt (HSS-Co) drill bits to drill wear-resistant steel plates; wear-resistant composite steel plates cannot be drilled by mechanical methods, only plasma cutting and gas gun step drilling can be used.