Heat treatment refers to the process of heating, keeping warm and cooling S355JR steel within a certain temperature range, the purpose of which is to change the structure and properties of the steel. For S355JR steel, common heat treatment methods include normalizing, annealing, quenching and tempering, etc.
Normalizing: heat S355JR steel to 800-900°C, keep it warm for a certain period of time, and then cool it to air temperature. At this time, the particle structure of the steel is relatively uniform, and the strength and hardness are also improved.
Annealing: Heat S355JR steel to 650-700°C, keep it warm for a certain period of time and then cool slowly to room temperature. At this time, the hardness and strength of the steel decrease, but the toughness and plasticity increase.
Quenching: S355JR steel is heated to above 850°C and then cooled rapidly (usually in water or oil). This treatment can greatly increase the hardness and strength of steel, but it will reduce its toughness.
Tempering: reheat the quenched S355JR steel to 400-700°C, keep it warm for a certain period of time and then cool it to room temperature. At this time, the hardness and strength of S355JR steel are appropriately reduced, while the toughness and plasticity are improved.
In general, heat treatment can improve the microstructure and properties of S355JR steel, making it more suitable for specific application scenarios. However, it should be noted that different heat treatment methods will have different effects on the properties of steel, and the appropriate treatment method should be selected according to the actual situation.
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