HARDOX 500 wear resistant plate has good plasticity, toughness and the most important wear resistance in performance, so it is often used in construction machinery, mining machinery, coal mining machinery, environmental machinery, metallurgical machinery and other manufacturing enterprises. But in the production process of HARDOX 500 wearable plate, tempering must be carried out.
Usually, the higher the tempering temperature of HARDOX 500 wear resistant plate is, the higher the plasticity and toughness, the lower the strength and hardness. However, it is found that when tempering at 250 350 and 470-650 C, there will be a significant decrease in toughness of HARDOX 500 steel, which is called the first kind of tempering brittleness and second types of tempering brittleness.
The first kind of temper brittleness refers to the irreversible tempering brittleness that occurs at low temperature during the tempering between 200 and 350 degrees Celsius, and the temper brittleness is unavoidable, no matter the speed of the tempering and the speed of the tempering. At this time, the impact toughness HARDOX 500 wear resistant plate decreases significantly, and the first type of temper brittleness is mostly intergranular fracture. The main factors affecting the temper brittleness of the first type are chemical composition.
The second types of tempering brittleness of the HARDOX 500 wear resistant plate exists in the tempering between Mn, Si, Ni and so on at 450 to 650 degrees Celsius or slowly through the temperature range after high temperature tempering. It occurs only in slow cooling tempering, but fast cooling can be avoided. It is reversible. It can be eliminated by reheating to more than 600 degrees Celsius and then fast cooling.
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