1. Normalizing: Heat treatment process of heating steel […]
1. Normalizing: Heat treatment process of heating steel or steel parts such as screws to an appropriate temperature above the critical point AC3 or ACM for a certain period of time and then cooling in the air to obtain a pearlite structure.
2. Annealing: heating the screw hypoeutectoid steel workpiece to 20-40 degrees above AC3, and after holding it for a period of time, it is slowly cooled with the furnace (or buried in sand or lime) to below 500 degrees and cooled in the air Heat treatment process
3. Solution heat treatment: heat the alloy to a high-temperature single-phase zone to maintain a constant temperature, so that the excess phase is fully dissolved into the solid solution, and then rapidly cooled to obtain a supersaturated solid solution.
4. Aging: The performance of the alloy changes with time when it is placed at room temperature or kept slightly higher than room temperature after solution heat treatment or cold plastic deformation.
5. Solution treatment: The screw fully dissolves various phases in the alloy, strengthens the solid solution, improves toughness and corrosion resistance, eliminates stress and softens, so as to continue processing and forming
6. Aging treatment: heat and keep warm at the temperature at which the strengthening phase precipitates, so that the strengthening phase precipitates out, hardened, and improved strength
7. Quenching: A heat treatment process in which the steel is austenitized and then cooled at an appropriate cooling rate, so that the workpiece undergoes martensite and other unstable structural transformations in the cross section or within a certain range
8. Tempering: heat the quenched screw to an appropriate temperature below the critical point AC1 for a certain period of time, and then cool it with a method that meets the requirements to obtain the required structure and performance of the screw.