Spring Steel Wire The requirements of the spring steel wire performance. Spring in the impact, vibration or long-term use of stress, so the requirements of spring steel wire with high tensile strength, elastic limit, high fatigue strength. In the process requires a certain spring steel wire hardenability, easy decarburization, surface quality and so on. Carbon spring steel wire that is carbon content of WC in the range of 0.6% -0.9% high-quality carbon structural steel. Alloy spring steel wire is mainly silicon and manganese steel, their carbon content is slightly lower, mainly by increasing the silicon content Wsi to improve performance; in addition to Ge, tungsten, vanadium alloy spring wire. In recent years, combined with China's resources, and in accordance with the requirements of new technology for automobile and tractor design, new steel grades such as boron, niobium and molybdenum have been developed on the basis of silicon-manganese steel to extend the service life of spring and improve spring quality The
Performance requirements:
Spring Steel Wire Spring in the impact, vibration or long-term use of stress, so the requirements of spring steel wire with high tensile strength, elastic limit, high fatigue strength. In the process requirements of the spring wire wire has a certain hardenability, easy decarburization, good surface quality and other carbon spring steel wire that is carbon content of WC in the range of 0.6% -0.9% quality carbon structural steel. Alloy spring steel wire is mainly silicon and manganese steel, their carbon content is slightly lower, mainly by increasing the silicon content Wsi to improve performance; in addition to Ge, tungsten, vanadium alloy spring steel wire. In recent years, combined with China's resources, and in accordance with the requirements of new technology for automobile and tractor design, new steel grades such as boron, niobium and molybdenum have been developed on the basis of silicon-manganese steel to extend the service life of spring and improve spring quality The
General spring wire can be used electric furnace, flat furnace or oxygen converter production; good quality or have special properties of high quality spring steel wire, with electric slag furnace or vacuum furnace refining. Spring steel wire in the carbon, manganese, silicon and other major elements of the provisions of a narrow range, smelting must be strictly controlled chemical composition. Silicon content is high when the formation of bubbles and other defects, steel bar forging after rolling is not easy to produce white spots. Therefore, the smelting of raw materials must be dry, try to remove the gas and inclusions, but also to avoid overheating of molten steel.
Spring Steel Wire Spring steel wire in the rolling processing to pay special attention to decarburization and surface quality. Steel surface serious decarburization, will significantly reduce the fatigue limit of steel. For high silicon spring wire such as 70Si3MnA, care should be taken to avoid graphitization. Therefore, the temperature during the hot work should not be too low (≥ 850 ℃), to avoid the graphitization easier to form the temperature range (650 ~ 800 ℃) stay too long.
After the spring is made by shot peening, the spring surface can produce residual compressive stress to offset the part of the working stress on the surface layer, inhibit the formation of surface cracks, which can significantly improve the fatigue limit of the spring.
