I provide NM360 NM400 NM450 NM500 wear resistant steel, imports Sweden, Belgium, Germany, Japan JFE, wear-resistant steel and other imports. I provide laser cutting, MOQ limited, since one kilogram sold, according to customer requirements size processing! NM400 NM400 is the definition of high-strength wear-resistant steel. NM400 has a very high mechanical strength; its mechanical properties is 3 times that of ordinary low-alloy steel plate to 5 times; can significantly increase the wear resistance of mechanical related components; therefore improve the mechanical life, reduce production cost of the product surface hardness is usually reach 360 ~ 450HB. Used for mining and construction machinery processing and manufacturing, and other wear-resistant wearing parts applicable structural steel. NM400 is a wear-resistant steel. NM--wear use "resistance" and "grinding" the first letter of Chinese Pinyin Brinell hardness HB 400 value. (400 hardness is a broad, domestic NM400 hardness range 360-420.) NM400 wear-resistant steel is widely used in construction machinery, mining machinery, mining machinery, environmental protection machinery, metallurgical machinery and other product components. Excavators, loaders, bulldozers, bucket board, edge board, side blade plate, blade. Crusher liner, wear-resistant steel blade into the delivery status: quenching - quenching and tempering Origin: Wugang, Wuhan, Nanjing, the new steel, Xingcheng. Wugang WISCO prospective Japanese companies JFE SSAB Swedish standard German standard DILLDUR Sumitomo enterprises quasi SUMIHARD WNM400 Series JFE-EH400A HARDOX400 400V K400 NM400 chemical composition composition C Si Mn PS Cr Mo Ni B CEV grades NM400 ≤0.25 ≤0.70 ≤1.60 ≤0.025 ≤0.010 ≤1.4 ≤0.50 ≤1.00 ≤0.004 wear steel processing method, steel cutting method is suitable for cold cutting and heat cutting. Cold cutting including water jet cutting, shearing, sawing or abrasive cutting; thermal cutting including oxy-fuel flame cutting (hereinafter referred to as "flame cutting"), and other particles and laser cutting. 2, cutting method: through the relevant process test, grasp steel various cutting methods and cutting the general characteristics thickness range. 3, high-level wear-resistant steel flame cutting method is as simple and ordinary low-carbon and low-alloy steel cutting, wear-resistant steel slab in the cutting, pay attention! ! ! With the increase of the plate thickness and hardness, cutting edge cracking tendency to increase. In order to prevent the generation of crack steel cutting, cutting should follow these recommendations: Cutting crack: produce hydrogen induced cracking when welding steel cutting cracks similar, if steel trimming cracks will only appear within 48 hours to several weeks Qiehou . Thus, cutting the crack crack belonging delayed, the greater the plate thickness and hardness, cracks appeared greater cutting. Preheat cutting: Prevention steel cutting crack the most effective way, is to be preheated before cutting. Before flame cutting, plate usually have warm-up, the preheating temperature depends mainly on the quality grade and thickness of steel as shown in Table 2. The method can be preheated flame burning gun, an electric heating pad, but also can be used heating furnace. To determine the plate preheating should be required for testing the temperature of the heat spots quilt. Note: Preheat special attention, being a steel plate interface to make uniform heating, heat the area in order to avoid contact with a partial overheating. Low-cut: Another way to avoid cutting cracks is to reduce the cutting speed. If you can not carry out a full-page pre-heating, you can use instead of the local preheating method. Use low-cut methods to prevent the cutting of cracks, its reliability is better to warm up. We recommend that you bring before cutting to cut several times with a flame gun cavity preheating, preheat temperature reaches about 100 ° C is appropriate. The maximum cutting speed depends on the steel grade and thickness of the cut after slow cooling requirements: both the cutting see whether preheated slow cooling after steel cutting will reduce the risk of cutting cracks. If after cutting it with warm but not be stacked, use insulated blanket to cover, you can achieve slow cooling, slow cooling requires cooling to room temperature. After cutting heating requirements: wear-resistant steel for cutting, to take the heating (tempering) immediately after cutting is effective prevention methods and measures cutting cracks. Cut into thick steel plate by tempering treatment can effectively eliminate the stress involved in cutting (low temperature tempering process; moisturizing timelines 5min / mm) after heating method for cutting, but also using combustion gun, electric heating blankets and heating furnace of grief heating after cutting 4, lower steel softened measures against softening properties of steel depends on its chemical composition, microstructure and processing methods. For thermal cutting of parts, components smaller the risk of the whole component to soften the greater. If the plate temperature exceeds 200-250 ° C, steel hardness is reduced. Cutting method: steel in cutting small parts, torch and heat supplied by preheating will gather in the workpiece. But not the size of the smaller cut, cut the workpiece size not less than 200mm, otherwise there is a risk of the workpiece will be softened. The best way to eliminate risk is to soften the cold cutting, such as water jet cutting. If you must use thermal cutting, the limited selection of plasma or laser cutting. This is because the flame cutting of the workpiece to provide more heat, thus increasing the temperature of the workpiece. Underwater cutting methods: limits and effective method to reduce the scope of softening zone used in the cutting process and cutting water and Intention steel surface. Thus, steel can be cut on the water, it can also cut water to the cutting surface. Using underwater plasma cutting methods to select or flame cutting. Underwater cutting has the following characteristics: small cutting heat affected zone; preventing reduce the hardness of the entire workpiece; reduce cutting workpiece deformation; workpiece can be cooled directly after cutting.