Heat treatment process of medium carbon steel
Heat treatment of steel is a process in which solid steel is heated, insulated and cooled in an appropriate way to obtain the desired structure and properties. Heat treatment can not only be used to strengthen steel, improve the performance of mechanical parts, but also can be used to improve the process performance of steel. The common denominator is that only the internal organizational structure is changed, and the surface shape and size are not changed.
Heat treatment process can significantly improve the mechanical properties of steel, increase the strength, toughness and service life of parts, improve hardness and wear resistance.
Therefore, important machine parts and tools should be heat treated. Heat treatment can also improve the processing performance of the workpiece, thereby increasing productivity and processing quality. Therefore, heat treatment plays a very important role in the machinery manufacturing industry.
In the production of quenching after high temperature tempering called "tempering treatment", tempering parts have good comprehensive mechanical properties, widely used in a variety of important structural parts, especially those working under alternating load connecting rod, bolt, gear and shaft. But the surface hardness is low, not wear-resistant. The surface hardness of parts can be increased by tempering and surface quenching.
The highest hardness that can be achieved after heat treatment of medium carbon steel is about HRC55(HB538), σb is 600 ~ 1100MPa. Therefore, in the various uses of medium strength level, medium carbon steel is the most widely used, in addition to as a building material, but also a large number of used in the manufacture of various mechanical parts. The medium carbon steel as long as the temperature is enough, holding time is generally possible to achieve this hardness value, if not deformation is impossible. It is recommended that there is a processing allowance, and then the grinding machine is processed, and the second is surface quenching.
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