Huzhou fastener manufacturer stainless steel screw blackening solution

Is stainless steel screw black how to return a responsibility, how should solve?
Stainless steel screw blackening is usually due to cold heading or rubbing teeth when the heat generated is too high caused. Usually found in the cruciform section. During the production process, the heat can be distributed in time by the lubrication oil supply, and the speed of the machine can be adjusted down appropriately to avoid problems. Of course, stainless steel screw blackening in addition to technical reasons, there may be stainless steel screw itself material problems will also cause stainless steel screw surface blackening.
 
How to solve the problem of stainless steel screw blackening, stainless steel screw blackening solution process
 
Remove oil-water-cross bath cleaner-water-neutralization-water-drying; heat the stainless steel screw cross bath cleaner to 70 °C, then put the stainless steel screw product into the cross bath cleaner after removing oil, soak for 5-15 minutes, over water, neutralize, blow dry.