The high-pressure air-cooling quenching technology used for square tubes has been promoted and applied. Foreign heat treatment manufacturers pay more attention to the cooling of square tubes during heat treatment. According to the technical requirements of alloy structural steel pipes, we can perform slow cooling, oil quenching and one-time gas quenching.

Rapid atmospheric circulation cooling uses high-pressure gas to spray into the cooling chamber. The computer controls the flow rate and flow rate changes to achieve a normal cooling rate within a specific time, thereby achieving the cooling curve required during the heat treatment of square tubes. The actual quality of heat treatment of alloy structural steel pipes. The quenching gas pre-cooled by the square tube gas quenching method is nitrogen and helium. When the jet is strongly realized by air, the structural alloy steel pipe is cooled at an extremely fast speed, and the surface after quenching will have an extremely thin oxide color film. The combination of vacuum low-pressure carburizing and high-pressure gas quenching is an advanced carburizing quenching process. It has the characteristics of fast carburizing speed, excellent carbide structure, small quenching cracking deformation, energy saving and carburizing agent raw material structure, good surface quality of alloy steel pipes, and environmental protection. At the heating point of the square tube, the processing equipment adopts oil cooling to achieve fan cooling.

All cooling devices are oil-sealed and self-cooled, completely replacing the water-cooling circulation related system. The entire heat treatment furnace does not use any cooling water. The water in the rectangular tube quenching oil tank plate heat exchanger is replaced by cooling oil. Due to the heat exchange of the hot oil, the cooling oil begins to heat up. The change in the specific gravity of the oil will cause the cooling oil to circulate. The radiator is combined with a fan to achieve a full oil cooling effect, which can save a lot of cooling water.
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