The current frequencies commonly used in 高頻淬火設備 分別是：

1、高頻加熱：100～500KHZ，常用200～300KHZ，電子管式高頻加熱，硬化層深度0.5～2.5mm，適用於中小型零件。

2. 2. Intermediate frequency heating: The current frequency is 500～10000HZ, usually 2500～8000HZ. The power supply equipment is a mechanical intermediate frequency heating device or a silicon controlled intermediate frequency generator. The depth of the hardened layer is 2-10 mm. Suitable for large diameter shafts, medium and large gears, etc. 3. Power frequency heating: The current frequency is 50HZ. Using mechanical power frequency heating power equipment, the depth of the hardened layer can reach 10-20mm, which is suitable for surface quenching of large-diameter workpieces.