Heat treatment plan for screw plugs
The heat treatment plan for screw plugs mainly consists of the following aspects
1. Normalizing
It is also a common heat treatment method to heat low carbon steel or medium carbon steel parts such as screw plugs to a moderate ambient temperature above the zero boundary point AC3 or ACM and maintain it for a certain period of time and then cool it in air to obtain a ferrite structure.
2. Solution heat treatment
The heat treatment process is to heat the metal to a continuous high temperature single-phase electric zone and maintain the temperature, so that the excess capacity phase is completely dissolved into the solid solution, and then rapidly cooled to obtain an oversaturated solid solution.
3. Annealing
Heat the work piece of the product of Rosia eutectoid to 20-40 degrees above AC3, and after a period of thermal insulation, slowly cool with the furnace (or cool in sand or lime powder) to below 500 degrees in the air Cooling heat treatment process.
4. Time limit
The phenomenon that the properties of aluminum alloys change with time when they are placed at an indoor temperature or maintained at a slightly higher indoor temperature after solution heat treatment or cold plastic deformation.
5. Solution treatment
The screw plug completely dissolves various phases in the aluminum alloy, strengthens the solid solution and improves the ductility and corrosion resistance, eliminates stress and softens, and facilitates re-production and processing. The common processing scheme for demagnetization of stainless steel bolts, but the strength will change. Loose, this point needs attention.
