What is the heat treatment process tempering?

Heat treatment process —tempering introduction

Operation method of tempering: reheat the quenched steel to a temperature below Ac1, and cool it in air, oil, hot water, or water after heat preservation.

Purpose: 1 Reduce or eliminate the internal stress after quenching, and reduce the deformation and cracking of the workpiece. 2 Adjust the hardness, improve the plasticity and toughness, and obtain the mechanical properties required by the work. 3 Stable workpiece size.

Application points: 1 Use low-temperature tempering to maintain the high hardness and wear resistance of steel after abandoning fire; use medium-temperature tempering to improve the elasticity and yield strength of steel under the condition of maintaining-fixed toughness; to maintain high strength Toughness and durability are king, and high temperature tempering is used when there is sufficient strength. 2. For general steel, try to avoid tempering at 230 to 280 degrees, and for stainless steel to be tempered between 400 to 450 degrees, because this will cause a temper brittleness.