Which is harder, high-frequency quenching or medium-frequency quenching?

Hello! The effects of high-frequency quenching and medium-frequency quenching on the hardness of workpieces are the same, but the difference is that high-frequency quenching is mainly aimed at those workpieces with shallow layer depth, while medium-frequency quenching is slightly deeper than layer depth. The hardness of the workpiece depends on the cooling mode after the workpiece is heated to a certain quenching temperature. The faster the cooling rate, the higher the hardness of the obtained structure. \x0d\\x0d\ The following is reproduced for your reference! \x0d\ Relationship between layer depth and frequency in heat treatment of high-frequency quenching equipment \x0d\ First of all, let's understand what high-frequency quenching equipment is: high-frequency quenching equipment, also known as high-frequency surface heat treatment equipment, uses high-frequency current magnetic field to instantly heat the metal surface to the phase transformation temperature of steel (choose the appropriate phase transformation temperature according to different materials), and then instantly cools the workpiece heated to the phase transformation temperature to 35℃ by cooling medium, so as to obtain a hardened layer on the metal surface. \x0d\ Then let's talk about the relationship between product depth and frequency processed by high-frequency quenching equipment. Because it is used for surface heat treatment, the hardened hard layer of the workpiece will need and control the depth. How to control the hardened layer is a technical process that must be understood in high frequency surface heat treatment. \x0d\ The effective heating depth of high-frequency quenching equipment in the process of processing products is also the effective quenching hard layer, and the heating penetration layer is determined according to the frequency and time of high frequency. The higher the frequency, the shallower the hardened layer, the lower the frequency and the deeper the hardened layer. Generally, we call it high-frequency quenching equipment, the frequency is above 100KHZ, and the hardened layer is generally between 0.5 and 0.8 mm; \x0d\ The frequency is 50-80KHZ, which is called high-frequency quenching equipment, and the hardened layer is 0.8-1.5 mm; \x0d\ frequency 15-35KHZ, which is called ultrasonic quenching equipment, and the hardened layer is 2-3mm; \x0d\ If the frequency is 1-8khz, we call it intermediate frequency quenching equipment, and the hardened layer is 4-6mm; The frequency below \ x0d \ 1 khz is called power frequency quenching equipment, and the quenching hard layer is between 7 and 8 mm; \x0d\ In the heat treatment process, we will encounter various surface heat treatment processes, and the requirements for hardness are the same as those for hard layer, because some products need not only hardness, but also willfulness, which is what we call mechanical properties. If the shaft with a diameter of 12mm is processed by medium frequency quenching equipment, the whole shaft will be hardened, its performance will become brittle and it will be easily broken during use. In this case, we will.