Wear-resistant steel has a variety of kind that can be divided into high manganese steel, medium and low alloy wear-resistant steel, chromium molybdenum silicon steel, corrosion-resistant steel, wear-resistant steel and special wear-resistant steel. Some common alloy steels such as stainless steel, bearing steel, alloy tool steel, and alloy structural steel are also used as wear-resistant steel under specific conditions. Because of their convenient source and excellent performance, they are also used in the use of wear-resistant steels and take a certain proportion.
Medium, low alloy wear-resistant steel usually contains chemical elements are silicon, manganese, chromium, molybdenum, vanadium, tungsten, nickel, titanium, boron, copper, rare earth and so on. Many large and medium-sized US ball mill liner are made of chrome molybdenum silicon or chrome molybdenum steel. While in the United States most of the grinding ball are manufactured with high-carbon chrome molybdenum steels. If the works are subjected to abrasive wear at a higher temperature (for example, 200 to 500 ° C) or a work subjected to a higher temperature due to frictional heat, it can be used with grinding wear resistant steel like chrome molybdenum vanadium, chrome molybdenum vanadium nickel or chrome molybdenum vanadium. This type of steel after quenching and the medium temperature or high-temperature tempering, there has the secondary hardening effect. Chromium molybdenum vanadium manganese steels and high carbon chrome molybdenum vanadium steels show a high wear resistance in the manufacture of cement mill rough grinding liner lining.
Wear-resistant steel is widely used in mining machinery, coal mining, engineering machinery, agricultural machinery, building materials, electrical machinery, railway transport industry fields. For example, the ball mill, liner, excavator bucket teeth, bucket, all kinds of crusher rolling shell wall, tooth plate, hammer, tractor and tank track plate, fan mill hit plate, railway rut fork, coal scraper conveyor with the middle of the slot in the plate, slot to help, ring chain, bulldozer with a blade, shovel teeth, large electric wheel with a liner, oil and open iron perforation with a cone bit. The above list is mainly limited to wear-resistant steel subjected to abrasive wear applications, and a variety of machinery where there is a relative movement between workpieces, will produce all kinds of wear and tear, there will be requested to improve workpiece wear requirements. The grinding media (balls, rods, and linings) used in ores and cement grinders are big consumables steel grinding parts. In the United States, most of the grinding balls are forged or cast with carbon and alloy steels, which accounts for 97% of the total consumption of the ball. In Canada, 81% of steel balls are consumed in the ball.
Wear-resistant steels are melted in EAF or IF furnace. Mainly products are casting, and, recently years, more to see forgings and hot rollings. In the general machinery application, the wear-resistant steel and other steels of the production process is not much difference, but in the heat treatment process or surface treatment process should be required to achieve the need to ensure wear resistance properties. For those materials, metallurgical purity significantly affects the wear resistance of steel should be taken to refine measures and limit the harmful impurities and gas content. The number, shape, and distribution of the second phase of the matrix often significantly affect the property of wear resistant steel. At this time, it needs to design the chemical composition of the steel, smelting, hot working, heat treatment (including thermo-mechanical treatment), etc., into consideration, in order to try to improve the wear resistance property from the required metallurgical factors.
Wear happens on the surface of the workpiece, therefore, to strengthen the surface of the workpiece is very important. In recent decades, a variety of surface strengthening technology and equipment developed rapidly, to take the necessary surface strengthening and surface modification measures, not only can save a lot of raw materials, and can give the workpiece surface layer with a variety of special, as a whole materials are difficult to get the organizational structure and performance, so as to achieve the most excellent wear resistance and huge economic benefits. Today, surface strengthening technology has become an important development direction for wear-resistant steel (including wear-resistant materials) research and application.
In recent years, steel surface strengthening (lubrication) technology develops rapidly. New technology, new process appears one after another, for different needs can choose a different surface strengthening technology to improve the wear of steel in various types of wear conditions. Carburizing, carbonitriding, nitriding and other processes are still the main measures to strengthen the mechanical parts. The use of infiltration, composite infiltration, boronizing, infiltration metal, spray welding, surfacing, vapor deposition, brush plating, ion implantation and other processes in different parts of the working conditions have achieved improved wear resistance significantly effect. In addition, casting, composite casting and another casting process in the manufacture of wear-resistant steel also have applied.
1. The steel plate cutting method is suitable for cold cutting and thermal cutting. Cold cutting includes water jet cutting, shearing, sawing or abrasive cutting. Thermal cutting includes oxyfuel flame cutting (hereinafter referred to as “flame cutting”), such as particle cutting and laser cutting.
2. Cutting method: through the relevant process test, master the various characteristics of the cutting method of the general characteristics and cutting thickness range.
3. High-grade wear-resistant steel flame cutting method and ordinary low-carbon and low alloy steel cutting as simple as cutting steel plate, you need to pay attention to, with the steel plate thickness and hardness increases, cutting-edge cracks tend to increase.
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