What is the difference between air tempering and vacuum tempering?

1. Vacuum annealing furnace is mainly suitable for continuous bright annealing, solid solution, demagnetization, and stainless steel quenching treatment of stainless steel products such as heating equipment, water expansion parts, pins, medical equipment, stainless steel nails, stainless steel screws, riveting parts, stainless steel bearings, watch cases, watch straps, cutting tools, micro shafts, self drilling, tableware, and other stainless steel products under the control of a protective atmosphere. After treatment, the surface of the product is smooth, non oxidizing, and non decarbonizing, which has the advantages of high production efficiency, low energy consumption, less pollution, convenient operation and use, and low labor intensity.
2. The air return furnace is used for tempering general metal parts in air, as well as quenching, annealing, and aging heat treatment of light alloy parts such as aluminum alloy die castings, pistons, and aluminum plates. For tool steel, both residual stress and residual Wostenite have adverse effects on the steel, and to eliminate them, high-temperature or low-temperature tempering treatment is necessary.