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Henan Friend Metal Products Co.,Ltd

The Evolution Of Spring Wire

Spring wire refers to steel that is dedicated to the manufacture of springs and elastic elements due to elasticity in quenching and tempering conditions. The elasticity of the steel depends on the ability of its elastic deformation, that is within the specified range, the ability of elastic deformation to withstand a certain load, after the removal of the load does not appear permanent deformation. In the case of

Spring steel wire should have excellent overall performance, such as mechanical properties (especially the elastic limit, strength limit, yield ratio), anti-elastic performance (that is, anti-elastic performance, also known as anti-relaxation performance), fatigue properties, , Physical and chemical properties (heat, low temperature, anti-oxidation, corrosion resistance, etc.). In order to meet these performance requirements, the spring wire has excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), precise shape and size. Performance requirements 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 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 Chinese 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 and manganese steel to extend the service life of spring and improve spring quality The Heat treatment of spring steel wire requires a higher strength and fatigue limit, generally in the quenching + tempering state of use, in order to obtain a higher elastic limit. The heat treatment process technology has a crucial impact on the inherent quality of the spring. Therefore, how to further improve the fatigue life of the spring, need further study, especially the chemical surface modification heat treatment, shot peening and so on have a significant impact on spring fatigue life.

In order to further strengthen the surface strength of the valve spring, increase the compressive stress, improve the fatigue life, valve spring forming, to further through the nitriding, low temperature liquid carbonitriding or sulfur nitrogen nitriding treatment, and then by shot peening. For example, Japan will f4mm si-cr oil quenching steel wire by 450 ℃ × 4.5h low temperature carbon nitriding and 400 ℃ × 15min by temperature tempering contrast, the fatigue limit can be increased by 240mpa. Nitrogen infiltration not only eliminates the adverse effects of decarburization, but also increases the residual compressive stress, while the high temperature strength of the valve spring by nitriding and cryogenic liquid carbonitriding increases, and the deformation at 150 ° C is 0.2% Value of 0.5%), 250 ℃ deformation of 0.56%, to improve the thermal stability of the valve spring and anti-relaxation stability, but nitriding and liquid carbonitriding time should be strictly controlled, otherwise it will form a network of sulfide And reticulated nitrides, but will reduce its fatigue strength.

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