1. Pollution during rinsing
The screws need to be cleaned reasonably with silicate cleaning agent after quenching, and there is a rinsing step after that, and residues must be prevented when rinsing.
2. To stack reasonably
After tempering, the screws may change color. If they are soaked in ether, there may be oily residues. At the same time, pay attention to the unreasonable stacking of the screws when heating, and the screws will appear slightly oxidized in the quenching oil.
