About the heat treatment scheme of the screw is mainly the following points

1. Positive fire

Heat the proportion of carbon steel or high -carbon steel parts such as screws to the appropriate temperature of the critical point AC3 or ACM or above to cool in the air after a certain period of time. It is the most common thermal treatment method to get the thermal treatment process of the pearl bodies.

Second, solid -soluble heat treatment

Keep the alloy heating to the high temperature single -phase area of the constant temperature, so that the excess phase is fully dissolved into the solid solution, and then cooled quickly to obtain a thermal treatment process of the saturated solid solution.

Third, annealing

Heat the screw Asian -analyzed steel workpiece to 20-40 degrees above AC3. After the heat preservation for a period of time, slowly cool down (or cooled in sand or lime) with the furnace to the heat treatment process of cooling in the air below 500 degrees.

Four, timeliness

After the alloy is solid -soluble thermal treatment or cold plastic deformation, when the room temperature is placed or slightly higher than the room temperature, the performance changes with time.

Five, solid solution treatment

The screws make the alloys the various phases and dissolves, strengthen solid solution and improve toughness and corrosion resistance, eliminate stress and softening, so as to continue processing and forming. The most common processing schemes of stainless steel screws are the most common processing schemes, but the hardness will soften.