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For general steel mills, it is often difficult to control the hardenability and grain size of the material. It is required to pay attention to the company in addition to certain testing methods. The two indexes of hardenability and grain size can be used as special order items, and many users do not make special requirements when ordering, but these two indexes have a great effect on controlling the heat treatment quality of gears. Therefore, qualified users can make orders at the time of ordering, or guarantee the technical conditions of hardenable structural steel according to GB5216-85, and control the grain size index.
Hardenability and hardenability refer to the ability of steel to be hardened. According to the modulus and process of the gear, the hardenability index of the material can be reasonably selected, which can effectively control the core structure, core hardness and gear of the gear. Distortion variable. The hardenability of the material has the greatest impact on gear distortion. The hardenability of steel is affected by many factors such as chemical composition, deoxidation operation, grain size, element segregation and heat treatment parameters. Improper selection of hardenability index will cause abnormal core structure after heat treatment of the gear; the hardness of the core is too high or low; the accuracy of gear shape accuracy is reduced, which affects the use effect and service life of the gear. Since hardenability is closely related to gear distortion, many domestic enterprises use the guaranteed hardenability steel (code H) to varying degrees. Although there are still many technical problems in the production of high-quality H steel in China, many steel mills and users have recognized the importance of this problem. This progress has been made in the introduction of the localization of motorcycle engine shifting gears and dual-drive shifting technology. Got it. Controlling the range of hardenability fluctuations is the first factor to solve gear distortion. At present, some users cannot fully use H steel that controls hardenability. The steel can be selected according to the modulus of the gear and the material hardenability data sheet, and the steel grade is determined on the basis of the process test. Grain size grain size reflects the ability of steel to resist grain growth at high temperatures. Since the process of the carburizing effective hardening layer requires a higher temperature and a longer time, when the material has a weaker ability to resist grain growth, a coarser structure is obtained after the heat treatment, and the mechanical properties and service life of the gear are reduced.