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Application of nitrogen in the field of metal thermal treatment: Nitrogen is the main component of air. It is a colorless, odorless, non-toxic and non-flammable gas at room temperature and atmospheric pressure. The boiling point is -195.8 °C, and its chemical properties are inactive. In addition to synthetic ammonia, nitrogen is usually used as a protective gas for metallurgy, chemicals, coal, food, medicine, electronics, magnetic materials, transportation, heat treatment, tires, thermoelectricity, aviation and other industries. Metal smelting, aluminum powder welding of aluminum radiators, brazing furnace, stainless steel tube, aluminum water slag removal, cross-linked cable, net bag furnace, wire wire, sheet metal cutting, metal cooling oxygen protection.