Spring steel performance requirements and production technology

Spring is in shock, vibration, or long-term stress under the action of cross use, so the spring steel must have a high tensile strength, elastic limit, high fatigue strength. Requirement in the process, spring steel has a certain degree of hardenability, difficult decarburization, good surface quality carbon spring steel, the carbon content in 0. 6% - 0. Within the scope of 9% high quality carbon structural steel. Alloy spring steel is mainly silicon manganese steel, the carbon content is slightly lower, mainly by increasing the silicon content to improve its performance. And tungsten, vanadium alloy spring steel. In recent years, the resource in our country, according to the requirements of automobile and tractor design new technology developed on the basis of silicon manganese steel join molybdenum, niobium, boron and other elements of the new steel. Performance requirements spring was in shock, vibration, or long-term stress under the action of cross use, so the spring steel with high tensile strength, elastic limit, high fatigue strength. Requirement in the process, spring steel has a certain degree of hardenability, difficult decarburization, good surface quality carbon spring steel, the carbon content in 0. 6% - 0. Within the scope of 9% high quality carbon structural steel. Alloy spring steel is mainly silicon manganese steel, the carbon content is slightly lower, mainly by increasing the silicon content to improve its performance. And tungsten, vanadium alloy spring steel. In recent years, the resource in our country, according to the requirements of automobile and tractor design new technology developed on the basis of silicon manganese steel join molybdenum, niobium, boron and other elements of the new steel. General spring steel production process can be used in a furnace, open hearth or oxygen converter production, high quality spring steel can be produced by electroslag furnace and vacuum furnace, special good quality or performance. Spring steel of carbon, manganese, silicon and other major elements content is low. When the high silicon content, easy to form bubbles and other defects. Smelting raw material must be dry, therefore, as far as possible to remove gas and inclusion, avoid overheating steel. Should pay special attention to in the process of rolling spring steel in decarbonization and surface quality. When the surface of the steel decarburization, fatigue limit of steel will be significant. For 70 si3mna high silicon spring steel, should pay attention to avoid the graphitization. Stop rolling temperature, therefore, should not be too low, 850 c) In order to avoid a long temperature range ( 650800c） Easy graphitization formation. Spring after production, spring surface can produce stress, to offset the spring surface part of the working stress, spring surface crack formation, thus significantly increased fatigue limit of spring.
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