The spring used in a shock, vibration or long term deposit stress, so the requirements of the spring steel with high tensile strength, elastic limit, a high fatigue strength. The spring steel hardenability is not easy to decarburization, good surface quality carbon spring steel carbon content of WC in the range of 0.6% -0.9% quality carbon structural steel is required in the process. Alloy spring steel is silico-manganese-based steels, the carbon content thereof is slightly lower, primarily to improve performance by increasing the silicon content Wsi; Ge addition, tungsten, vanadium alloy spring steel. In recent years, combined with China's resources, and in accordance with the design of new technologies in automobiles, tractors, new steel grades developed on the basis of silico-manganese steel, boron, niobium, molybdenum and other elements, extend the service life of the spring, to improve the quality of the spring . The performance requirements for the spring for use in shock, vibration or long term deposit stress, so the requirements of the spring steel with high tensile strength, elastic limit, a high fatigue strength. The spring steel hardenability is not easy to decarburization, good surface quality carbon spring steel carbon content of WC in the range of 0.6% -0.9% quality carbon structural steel is required in the process. Alloy spring steel is silico-manganese-based steels, the carbon content thereof is slightly lower, primarily to improve performance by increasing the silicon content Wsi; Ge addition, tungsten, vanadium alloy spring steel. In recent years, combined with China's resources, and in accordance with the design of new technologies in automobiles, tractors, new steel grades developed on the basis of silico-manganese steel, boron, niobium, molybdenum and other elements, extend the service life of the spring, to improve the quality of the spring . Production generally spring steel furnace, open-hearth, or oxygen converter available production; better quality or a special performance quality spring steel, electric slag furnace or vacuum furnace refining. The narrower range of a predetermined content of the main elements of carbon, manganese, silicon and other spring steel smelting, the chemical composition must be strictly controlled. Easy to form bubbles and other defects in the silicon content is high, cooling after forging steel ingot rolling is not easy to produce white spots. Therefore, the smelting of raw materials used must be dry, try to remove the gas and inclusions, but also to avoid overheating of the molten steel. Spring steel rolling processing pay special attention to the decarburization and surface quality. When the a serious steel surface decarburization, can significantly reduce the fatigue limit of the steel. Should be taken to avoid the high silicon spring steel, such as 70Si3MnA graphitization. Therefore, the to stop rolling temperature in the thermal processing should not be too low (≥ 850 ° C), avoid long duration easier to form the graphitization temperature range (650 to 800 ° C). Made of spring after shot peening of springs surface residual compressive stress on the surface to offset part of the work stress, inhibition of the formation of surface cracks, which can significantly improve the fatigue limit of the spring. 1.65, 70, 85: high strength, hardness, yield ratio can be obtained, but hardenability small, poor heat resistance, to withstand low dynamic loading and fatigue load is widely used, but more for the working temperature is not high the small spring or less important for larger springs. Such as automobiles, tractors, railway vehicles and general machinery spring. The 65Mn simple composition, hardenability and mechanical properties, process performance decarbonization than carbon steel, but is more sensitive to overheating, temper brittleness, quenching is easy to crack a lower price, the amount of. Manufacture all kinds of small cross-section flat spring, round spring, spring, etc., can also be made valve spring, spring ring, shock absorber and clutch spring, brake spring. 2.55Si2Mn, 60Si2Mn, 60Si2MnA silicon content (WSI) (maximum 2.00%). High strength, good elasticity. Good temper resistance. Easy to decarburization and graphite. Hardenability is not high. Major spring steel type, very versatile. Manufacture all kinds of springs, such as automobiles, motorcycles, tractors, leaf springs, coil springs, cylinder valve spring and work under high stress spring, badly worn spring. 55Si2MnB boron-containing hardenability significantly improved light to medium-sized car's front and rear suspension springs, Deputy spring. 55Si2MnB developed by China itself steel, hardenability, mechanical properties, fatigue properties compared the good steel 60Si2Mn major manufacturing, good small car leaf spring, using the results, can also be made of other middle-sectional dimensions leaf spring, coil spring . 3.60Si2CrA 60Si2CrVA high strength spring steel. High hardenability, heat treatment process performance. High strength, coiled spring should be timely treatment to relieve internal stress manufacturing load large spring. 60Si2CrA system steam turbine steam seal spring, adjustable spring the condenser support spring, disc spring, high pressure water pump. 60Si2CrVA Steel also produced a very important spring, such as conventional weapons, bombs hook spring, spring breakers. 4.55CrMnA 60CrMnA outstanding advantages hardenability, the another hot workability, mechanical properties, anti-decarburization performance of large cross-section of various important spring, such as cars, locomotives large leaf springs, coil springs and so on. 5.60CrMnMoA the hardenability highest in existing spring steel,. Mechanical properties, resistance to tempering stability of large civil construction, heavy vehicles, machinery and other very large spring. Plate thickness up to 35mm round bar diameter more than 60mm. A small amount of 6.50CrVA vanadium improve flexibility, strength, yield ratio and bomb less resistance, grain refinement, to reduce the tendency to decarburization. Smaller carbon content, ductility, toughness compared to other spring steel. High hardenability, fatigue performance, or a variety of important coil springs, especially suitable for high work stress amplitude fatigue performance demanding springs, valve springs, nozzle springs, cylinder piston rings, valve spring. The 7. 60CrMnBA hardenability than 60CrMnA various other properties similar to the larger size of the leaf springs, coil springs, torsion springs, etc.. 8 30W4Cr2VA high-strength heat-resistant spring steel. The hardenability good. High-temperature resistance relaxation and thermal processing performance is also very good operating temperature below 500 C heat-resistant spring, such as turbine main steam valve spring, the steam seal spring piece, boiler safety valve spring, 400T boiler disc valve spring.