In general, the heat treatment of stainless steel screws is determined based on the hardness of the screws themselves. Common heat treatments include tempering heat treatment, chemical heat treatment, and partial heat treatment. The first two types of heat treatment are planned for the whole, while the final type is a heat treatment method for partial treatment. Regardless of which heat treatment method is used, it is very important for the screw itself.
The heat treatment methods used for different hardness are also different. Even for the same heat treatment method, the selected scale and hardness specifications may vary depending on the hardness. Three major heat treatment methods for stainless steel screws: tempering heat treatment: tempering heat treatment is mainly carried out using induction heating or flame heating methods. You can use two hardness testers to test the hardness of screws, and then decide which standard heat treatment to choose. The two hardness testers are Vickers hardness tester and Rockwell hardness tester.
In addition to determining the hardness, the Vickers hardness tester can also be selected based on the thickness of the surface heat treatment used for processing or many units that use surface heat treatment of workpieces; When the surface heat treatment hardening layer is thick, a Rockwell hardness tester can also be used. Different tempering heat treatment specifications can be interchangeable because their conversion values are internationally recognized. After selecting a hardness tester, different scales should be selected, namely HRA scale and HRC scale.
Chemical heat treatment: Another heat treatment method for screws. Chemical heat treatment mainly involves infiltrating atoms of one or several chemical elements into the surface of the workpiece, thereby altering the chemical composition, arrangement, and properties of the workpiece surface. What can be achieved after chemical treatment? After quenching and low-temperature tempering, chemical heat treatment can make the surface of the workpiece have high hardness, wear resistance, and touch fatigue strength, while the core of the workpiece has high strength resistance.