The heat treatment process requirements of JIS G3115 SPV490 steel plate usually include the following aspects:

1. Quenching: Heating to an appropriate temperature (usually above the critical temperature) and holding it for a period of time, then rapidly cooling to room temperature to change the structure and properties of the JIS G3115 SPV490 steel plate. Quenching can increase the hardness and strength of steel plates.

2. Tempering: Reheat the quenched JIS G3115 SPV490 steel plate to a lower temperature, and then adjust the hardness and toughness of the steel by controlling the cooling process to reduce internal stress and improve its workability and brittleness resistance. .

3. Welding heat treatment: For JIS G3115 SPV490 steel plates that need to be welded, post-weld heat treatment may be required after the welding is completed to restore or adjust the structure and properties of the welding area and avoid hardening and embrittlement problems caused by welding.

4. Annealing: In some cases, JIS G3115 SPV490 steel plates may need to be annealed, that is, heated to a higher temperature and then cooled slowly to eliminate residual stress and improve plasticity and processing properties.

5. Carburizing: If it is necessary to increase the carbon content on the surface to improve wear resistance or hardness, carburizing may be used to expose the JIS G3115 SPV490 steel plate to a carbon-rich environment.

These heat treatment processes can be adjusted according to specific requirements and application areas to ensure that the final JIS G3115 SPV490 steel plate has the structure, performance and durability that meet the standard requirements. Before performing any heat treatment, always refer to relevant standards, specifications or manufacturer guidelines to ensure that the heat treatment process is performed correctly and to avoid adverse effects.