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What is the difference between bimetal wear-resistant steel plate and hardened wear-resistant steel plate?

Release time:

2023-10-27

1. Definition: 　 ⑴Bimetal wear-resistant steel plate refers to the composite high-alloy wear-resistant layer on the substrate of ordinary steel plate by hardfacing method, combining the wear-resistant performance of the wear-resistant layer and the load-bearing, deformability and weldability of the substrate. The hardness of the wear-resistant layer is generally between HRC52-64.

1. Definition:
　
⑴Bimetal wear-resistant steel plate refers to the composite high-alloy wear-resistant layer on the substrate of ordinary steel plate by hardfacing method, combining the wear-resistant performance of the wear-resistant layer and the load-bearing, deformability and weldability of the substrate. The hardness of the wear-resistant layer is generally between HRC52-64.
　
⑵ Hardened wear-resistant steel plate refers to a low-alloy steel plate that is hardened by quenching during the rolling process or the low-alloy steel plate is heat-treated and quenched and hardened. The hardness is generally HB350-500.
　
2. wear resistance and mechanism
　
The wear-resistant layer of the bimetal wear-resistant steel plate is a high-alloy component. There are a large number of high-hardness alloy carbides (about HV1600) embedded in the matrix in the metallographic structure, which are the main carbides that play a role in anti-wear. The actual micro hardness of the wear layer is much higher than the measured macro hardness. The strengthening method is the same as that of cemented carbide.
　
Hardened wear-resistant steel plate is quenched and hardened as a whole, and there is martensite in the metallographic structure to increase the overall hardness, and the micro-hardness and macro-hardness are basically the same.
　
Everyone is familiar with the two materials used for tools: cemented carbide and T10. Even if the macroscopic hardness of the quenched T12 steel and cemented carbide is basically the same, the wear resistance of cemented carbide is much higher than that of T12 steel. The reason is that there are a lot of carbides in the cemented carbide.
　
3. Temperature resistance
　
The hardened wear-resistant steel plate will gradually lose its hardness when used at a temperature higher than 250℃, which greatly reduces the wear resistance. The welding process will also reduce the hardness near the weld;
　
The wear-resistant layer of the bimetal wear-resistant steel plate is of high alloy composition, and it has the effect of secondary hardening at a certain temperature, and it can generally work below 650℃.
　
4.Process performance
　
Hardened wear-resistant steel plates can be punched mechanically, but bimetal wear-resistant steel plates cannot be punched mechanically.
　
5. comprehensive comparison

\	Hardened wear-resistant steel plate	Bimetal wear-resistant steel plate
Hardening method	Quench hardening	Hardfacing wear-resistant alloy
Alloying elements	Si and Mn	Cr, Mo, V and B etc.
Hardness	HB350-500	HRC52-64
Wear resistance	generally	very good
Temperature resistance	poor	excellent
Corrosion resistance	same as ordinary steel plat	Good
Machining by mechanical method	yes	no
Cutting method	Flame cutting	Plasma cutting
Processing performance	excellent	normal

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