The spiral steel pipe is to roll the low -carbon carbon structure steel or low alloy structure steel band at the angle of the spiral line (called the forming angle) into a tube blank, and then welded the pipe seam. Steel production of large diameter steel pipes. Its specifications are expressed in the outer diameter*wall thickness. The welded pipe should ensure that the water pressure test, the tensile strength and cold bending performance of the weld should be complied with the regulations.
The steel pipe with a ratio of the outer diameter of the steel pipe and the ratio of wall thickness is called thick wall spiral pipe. It is mainly used for petroleum geological drilling pipes, cracking tube for petrochemicals, boiler tubes, bearing tubes, and high -precision structural tubes such as cars, tractors, and aviation.
The production control of thick wall spiral tube is to improve the plastic toughness of the steel pipe, improve the cleanliness of steel water, reduce harmful mixing, and improve the overall quality of the steel pipe. In the production process, a reasonable cooling system is adopted to avoid cracks inside, and the quality of steel pipes will be improved from various aspects.
There are many procedures for the production process of the spiral tube. The last step is to reduce the speed of the roll. The roll speed is a key parameter of the perforation process. During the process of the roll speed from low to high, there is a rocket roll speed that begins to appear. When the roll speed is low, the pipeline is prone to form a hole cavity; when the roll speed is high, the pipe and 45#structural spiral steel pipes are prone to form layered defects. In order to eliminate tubular and 45#structural spiral steel tube layered defects, the roll speed should be reduced to below the rotation speed of the stratified critical rolls.
The spiral tube rationally controls the heating temperature during the production process. By determining the thermoplastic curve, the best heating temperature is selected. Pay attention to the heating of the tube to have enough insulation time to reduce the deformation resistance and increase the 45#structure thick wall spiral tube plastic toughness.
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