At present, there are mainly two kinds of wear-resistant steel plates on the market, one is wear-resistant composite steel plate, and the other is heat-treated wear-resistant steel plate, such as JFE-EH C400, DILLIDUR 400, NM400, and the like. How to choose these two kinds of wear-resistant steel plates, you need to understand the difference between the two steel plates, the following compares from several aspects:
First, the definition
The wear-resistant composite steel plate refers to a composite high-alloy wear-resistant layer by a surfacing method on a substrate of a common steel plate, combined with the wear resistance of the wear-resistant layer and the bearing capacity, deformability and weldability of the substrate. The hardness of the wear layer is generally between HRC 52-64.
The heat-treated wear-resistant steel plate refers to a steel plate which is quench-hardened during rolling in a low-alloy steel plate or heat-treated and quench-hardened to a low-alloy steel plate, and is sometimes referred to as a tempered steel plate. The hardness is generally HB360-550.
Second, wear mechanism and wear resistance
The wear-resistant layer of the wear-resistant composite steel plate is a high-alloy component, and a large amount of high-hardness alloy carbide (about HV1600) is embedded in the metallurgical structure, and the anti-wear effect is mainly carbide. The actual microhardness of the wear layer is much higher than the measured macro hardness and is strengthened in the same way as cemented carbide. Although the hardness of the wear layer is high, the load bearing strength is very low. In addition, the substrate is a common steel plate and does not have wear resistance.
The heat-treated wear-resistant steel plate is quench-hardened as a whole, and the whole body has wear resistance. The metallographic structure is mainly martensite, which greatly improves the overall hardness and strength, and the micro-hardness and macro-hardness are basically the same.
Third, temperature resistance
The wear-resistant layer of the wear-resistant composite steel plate is a high-alloy component, and has a secondary hardening effect at a certain temperature, and generally can work below 650 ° C.
The heat-treated wear-resistant steel plate is gradually annealed to lose hardness when used above 250 ° C, so that the wear resistance is greatly reduced. Thermal cutting and welding processes also produce a decrease in hardness in the heat affected zone.
Fourth, the processability
When the wear-resistant composite steel plate is hot-cut, generally only plasma cutting can be used, the molding is limited, the bending performance is far less than the heat-treated wear-resistant steel plate, and the high-alloy surfacing layer can hardly be machined, and the welding can only be performed on the substrate.
Heat-treated wear-resistant steel plate can be applied to all cutting and cutting methods, and the bending forming performance is good. Machining and welding can be reliably realized under the condition of certain processes.