Heat Treatment Process for SCM440 Steel under JIS G4053 Standard

The heat treatment process for SCM440 steel under JIS G4053 standard typically involves the following steps:

1. Annealing: Heat the SCM440 steel to a temperature of 800-850°C and hold it at that temperature for a suitable period of time. Slowly cool the steel in the furnace or by burying it in sand or ashes to allow for gradual cooling. This process helps to refine the grain structure, relieve internal stresses, and improve machinability.

2. Normalizing: Heat the SCM440 steel to a temperature of 870-920°C and hold it at that temperature for a sufficient time. Then, air-cool the steel to room temperature. Normalizing enhances the mechanical properties of the steel by refining the grain structure and improving uniformity.

3. Hardening: Preheat the SCM440 steel to a temperature range of 850-900°C. Then, heat it further to a temperature of 880-920°C and keep it at that temperature for a specific time depending on the section thickness. Quench the steel rapidly in oil or water to obtain high hardness.

4. Tempering: Reheat the hardened SCM440 steel to a temperature of 550-650°C and hold it at that temperature for an appropriate duration. The specific temperature and time will depend on the desired mechanical properties. Tempering reduces the brittleness caused by the hardening process and provides the steel with the desired balance of hardness and toughness.

It's important to note that the exact heat treatment parameters may vary based on factors such as steel composition, section thickness, and desired properties. Therefore, it is recommended to refer to the JIS G4053 standard or consult with heat treatment experts for specific guidelines and recommendations for the SCM440 steel.

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