C100S high hardness and wear-resistant spring steel blue spring steel imported spring steel imported spring ..

--- Spring characteristics of spring steel under dynamic loading is mainly working, that is, under shock and vibration conditions, or under alternating stress of work, the use of elastic deformation to absorb impact energy, acting as a buffer. Since the spring often withstand vibration and long-term change in the share under stress, mainly fatigue damage, so spring steel must have a high elastic limit and a high fatigue limit. In addition, there should be enough toughness and ductility, to prevent any impact force suddenly brittle fracture. In terms of technology, the spring steel should have good hardenability and low overheating, decarbonization sensitivity. Reduce spring surface roughness can be improved fatigue life. In order to obtain the desired properties, spring steel must have a high carbon content. Carbon spring steel carbon content between 0.6-0.9%, due to carbon spring steel hardenability is poor, it is only used to make cross-sectional dimension of no more than 10-15mm spring. For larger cross-sectional dimensions of the spring, it must be made of alloy spring steel. Jia Wang alloy spring steel between 0.45-0.75% carbon content, alloying elements are Mn, Si, W, V, Mo and the like. Their main role is to enhance hardenability and tempering stability, strengthening of ferrite and grain refinement, effectively improve the mechanical properties of spring steel, in which Cr, W, Mo can improve the high temperature strength of steel. Forming in the hot state spring (diameter or thickness of 10mm or more) formed in the cold state spring (diameter or thickness of 10mm or less) Thermoforming spring heat treatment process - this way most of the hot springs forming forming and heat treatment carried out together, but most of the coil spring is subjected to heat treatment after hot forming. This spring steel heat treatment is quenching and tempering after heat treatment is tempered prop's body. Elastic limit and ultimate high yield of such organizations, and a certain toughness. Cold formed spring heat treatment process - for cold-rolled steel sheet, strip or cold-drawn steel wire spring, due to the cold plastic deformation of the material strengthening, spring has reached the required performance. Therefore, just after spring molding in the range of about 250C, about 30min heat stress to deal with in order to eliminate the internal stress generated by cold forming the spring, and spring stereotypes can be. Heat treatment of heat-resistant spring steel - the valve spring is the engine work at higher temperatures, and some corrosive atmosphere, and therefore must use special spring steel and a suitable heat treatment specifications. When spring quenching common defects and preventive measures (1) decarbonization (reduced service life) - 1, Zhu made using salt bath furnace or heating furnace atmosphere. 2, the use of rapid heating process. (2) insufficient hardness after quenching, many non-martensite, the center appears ferrite (produced and residual deformation, reducing the service life) - 1, choose good hardenability material. 2, to improve the cooling capacity of quenching agent. 3, spring into the coolant temperature should be controlled in the above Ar3. 4, an appropriate increase in quenching temperature. (3) overheat (fragility) - 1, strictly control the molding and quenching temperature. 2, to enhance quenching metallographic examination. (4) cracking (fragility, severely reduce the service life) - 1, controls the quenching temperature. 2, when cooled to 250-300C, remove the air-cooled quenching. 3, timely spring tempered improve the quality measures (1) thermomechanical treatment - deformation of steel-reinforced and heat strengthened combine the two, in order to further improve the strength and toughness of steel. Thermomechanical treatment of high, medium and low points. Immediately after high temperature thermomechanical treatment is deformed in the austenitic state quenching can also be combined with forging or hot rolling, quenching immediately after that is thermoforming. Thermomechanical treatment has been used in the automotive leaf spring production. (2) spring Austempering - or let in the smaller diameter of the springs may be enough Austempering, it can not only reduce the deformation, but also improve the strength and toughness, preferably after isothermal quenching and tempering once again, can improve the elastic limit, the same as the tempering temperature and isothermal quenching temperature. (3) Spring relaxation treatment - spring time under external work, the results of the stress relaxation will produce a small amount of permanent (plastic) deformation, especially in the spring high-temperature operation, high temperature stress relaxation phenomenon is even more serious, so that the accuracy of the spring is reduced, which for general precision spring is not allowed. Therefore, these spring after quenching and tempering should be a relaxation treatment - for spring pre-load, making the amount of deformation possible distortion exceeds the amount of spring work. Then under conditions above the operating temperature of 20C, heating, insulation 8-24h. (4) low-temperature carbonitriding - tempering and low temperature nitrocarburizing (soft nitriding) combination of technology, can significantly improve spring fatigue life and corrosion resistance, this process is used for the coil spring. (5) shot peening - scratches the surface defects, folding, oxidation and decarbonization and so tend to be the places where spring work stress and fatigue fracture sources. If the high speed jet printing Shot with a small spring surface, not only to improve the spring surface quality, increase surface strength, and the surface is in compressive stress, thereby increasing the spring fatigue strength and service life. The above information is provided by the Dongguan City, Chiayi contact Wang Metal Materials Co.; Lin Tel 13712969796; 0769-81629576 or 81629676