Q345R is a commonly used boiler steel plate whose heat treatment process is crucial for improving the mechanical properties and durability of the material. The following is the typical heat treatment process of Q345R steel plate:
1. Preheating: The Q345R steel plate is heated to the appropriate temperature, usually between 300°C and 600°C, to reduce the stress and temperature gradient during cooling.
2. Heating: the preheated steel plate is heated to the target temperature, which depends on the specific heat treatment requirements. Normally, the heating temperature is 900°C to 1000°C.
3. Soaking: Keep the steel plate in the target temperature for a certain time to ensure the uniform distribution of temperature and make the tissue reach a stable state. The holding time is generally determined according to the thickness of the material, usually between 30 minutes and 2 hours.
4. Air cooling: the insulated steel plate is removed from the furnace and then cooled to room temperature naturally. The speed of air cooling is faster, which can produce a hard organizational structure.
5. Normalizing: In some cases, Q345R steel plate can also be normalized. Normalizing is heating the steel plate to the appropriate temperature, usually between 900°C and 950°C, and cooling it in air. This results in a more uniform organizational structure and better mechanical properties.
It is important to note that specific heat treatment parameters and processes may vary from manufacturer to manufacturer, application needs and specification requirements. Therefore, in practical applications, the relevant process procedures and standards should be followed to ensure that the quality and performance of the heat treatment of Q345R steel plate meet the requirements.
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