What is the difference between wear-resistant steel plate and wear-resistant composite steel plate
There are two kinds of commonly used wear-resistant steel plate, one is wear-resistant composite steel plate, the other is heat treatment wear-resistant steel plate, such as domestic wear-resistant steel plate: NM400, NM450, NM500 and so on; Imported wear-resistant steel JFE-EH400, JFE-EH450, DILLIDUR 500, DILLIDUR 550 and so on. So, let's compare the difference between wear-resistant steel plate and wear-resistant composite steel plate!
1. Composition and hardness
Wear-resistant composite steel plate refers to the composite of high alloy wear-resistant layer on the substrate of ordinary steel plate by surfacing welding method, combining the wear-resistant performance of the wear-resistant layer and the bearing capacity, deformation capacity and weldability of the substrate. The hardness of the wear layer is generally between HRC50-60.
Heat-treated wear-resistant steel plate refers to the low-alloy steel plate hardened during rolling, or the steel plate hardened after heat-treated low-alloy steel plate, sometimes also known as tempered steel plate. The hardness is generally HB360-550.
Second, wear resistance mechanism and wear resistance
The wear-resistant layer of the wear-resistant composite steel plate is a high-alloy component, and a large number of high-hardness alloy carbides (HV1600 or so) in the metallographic structure are embedded on the matrix, and the anti-wear effect is mainly carbide. The actual micro hardness of the wear layer is much higher than the measured macro hardness, and its strengthening method is the same as that of cemented carbide. Although the hardness of the wear layer is very high, the bearing strength is very low, in addition, the substrate is an ordinary steel plate, which does not have wear resistance.
Heat treatment wear-resistant steel plate is the whole hardening, the whole body has wear resistance, the metallographic structure is mainly martensite, so that the overall hardness and strength have been greatly improved, micro hardness and macro hardness are basically the same.
Three, temperature adaptation performance
The wear-resistant layer of the wear-resistant composite steel plate is a high alloy component, and there is a secondary hardening effect at a certain temperature, which can generally work below 650 ° C.
Heat-treated wear-resistant steel plates gradually lose hardness when used above 250℃, which greatly reduces the wear resistance. Thermal cutting and welding processes also produce a decrease in hardness in the heat-affected zone.
Fourth, reprocessing performance
Wear-resistant composite steel plate hot cutting generally can only use plasma cutting, the forming is more limited, the bending performance is far less than the heat treatment wear-resistant steel plate, high alloy surfacing layer basically can not be machined, welding can only be carried out on the substrate.
The heat-treated wear-resistant steel plate can be applied to all cutting and cutting methods, and the bending and forming performance is good. Under the condition of following a certain process, machining and welding can also be reliably realized.
5. Service life
Under the same working conditions, generally speaking, the service life of wear-resistant steel plate is longer than that of wear-resistant composite steel plate.
