Operation method: heat the quenched steel piece from the beginning to a certain temperature below AC1, and cool it in air, oil, hot water and water after heat preservation.
Intention:
Reduce or eliminate the internal stress after quenching, reduce the deformation and cracking of workpiece;
Adjust the hardness, improve the plasticity and durability, and achieve the mechanical function required by the operation;
Stable workpiece scale.
Application key:
The steel should be tempered at low temperature when it has high hardness and wear resistance after quenching;
Medium temperature tempering is used to improve the elasticity and yield strength of steel under the condition of certain toughness;
High temperature tempering is used when the impact toughness and plasticity are high and the strength is satisfied;
Generally, steel should be prevented from tempering between 230-280 ° C and stainless steel between 400-450 ° C, because one tempering brittleness will occur at this time.
On 2018-08-08 11:45:46
