The reasons for tempering stainless steel shrapnel are as follows:
A. In order to stabilize the workpiece size
B. There is a great internal stress and brittleness after quenching. If the steel is not tempered in time, the steel will deform and crack.
C. The mechanical properties required by stainless steel shrapnel are obtained. After quenching, the workpiece has high hardness and high brittleness. In order to meet the requirements of different properties of various workpieces, the hardness can be adjusted and the brittleness can be reduced by proper tempering to obtain the required toughness and plasticity.
D. For some alloy steels that are difficult to soften by annealing, high temperature tempering is often used after quenching (or normalizing), so that carbides in the steel can gather properly and the hardness will be reduced to facilitate cutting.
The purpose of tempering is to stabilize the dimension, reduce the brittleness, eliminate or reduce the internal stress, obtain the mechanical properties required by the workpiece, and reduce the hardness for cutting.