Steel pipe jet vortex quenching technology

In the steel manufacturing process, like a important uses for steel products, such as oil well pipes, boiler tubes, etc., are needed most hardened in order to obtain the desired mechanical properties. Cooling as a key link hardened steel heat treated for production efficiency, product quality and economic efficiency ultimately have a significant impact.

In a variety of steel quenching techniques, water as a quenching medium can reduce environmental pollution, reduce the cost of pipe, tubing improve performance. Water quenched steel ring main quench hardening, sink and bench quench hardening three kinds of forms. Quench hardening is quench ring ring on the outer surface of the inner and outer surface of the pipe or spray quenching, while the forward side of the hardened steel rollers in. Such quenching way lower productivity, production specifications single, in recent years has been rarely used. Sink is quenched, after quenching the steel pipe is filled into the quenching medium (usually water or saline) water tank using the inner and outer surfaces of the water tank cooling tubes. In this manner hardening of the tube is bent easily, particularly small-diameter steel pipe is more easily bent.

Using water as a quenching medium low temperature cooling rate is too fast, too sensitive to changes in water temperature cooling characteristics and other characteristics, easily lead to quench cracking steel products appear in the quenching process, uneven hardness and large distortion phenomena, water quenching technology and water quenched the device itself is continually developing and perfecting the process. The latest technology in the steel swirl spray quenching. Hardened steel tube axial swirl spray cooling water (you can also use other quenching medium) after the adoption by the adjustable swirl generator was swirling state and the state of the cooling water of the cyclone to be heated in the import of steel quenching holes, to realize a steel pipe quenching. In the quenching process, to achieve uniform cooling steel pipe, steel pipe to prevent deformation hardening, quenching water flow at the inlet end of the tube head between the swirl generator and the nozzle be sealed by a gasket to prevent leakage of the cooling water discharge pipe end the outer surface of the tube after the formation of localized cooling unevenness. Steel pipe section using the tube holder to keep steel during quenching position, preventing hot pipe in the hole because of the weight and vibration distortion caused by disturbance of water near the inlet end of the tube holder to hold fast, since the clamping tube effect, set aside the remaining gap between the holder and the tube, the tube body shrinkage during cooling to proceed smoothly while maintaining the position of the tube.