Difference between hot stretch pipe and straight seam welded pipe

Due to the constraints of the production process, the high cost of seamless steel pipe production, resulting in its gradual decline in economic efficiency. As the technology advances, China's metallurgical industry, instead of hot-drawing seamless steel pipe to reduce the beginning of new products appear.


1, the quality of a direct decision of the quality of welded steel pipe, welded steel pipe and seamless pipe is the biggest difference is that. Longitudinal high-frequency welding, the weld straight carbon can not be eliminated, but the weld interface with the parent material, not fully fused into one, can not stand the test of time and pressure. The high temperature welded steel pipe to reduce the overall thermal tension after the heating temperature up to 800 degrees, the overall annealing, and then open the conversion process, after this series of treatment, the weld with the parent organization has the same performance, completely fused into one, well done Seamless transition from one seam.


2, resulting in differences in product quality and different processes to reduce the thermal stress of high-frequency welded pipe also carried out a longitudinal process, without internal and external glitch removal. The presence of glitches can affect the flow of fluid in the pipeline and the failure of Neptune Casino, which blocks normal water flow, resulting in Whirlpool. According to the principle of fluid mechanics, the unavoidable part of the welding pressure increases, the discontinuity makes the pipe insurance factor is also greatly reduced, hot stretch reducing steel production process takes full account of the burr risk, limiting the removal of burrs, so that the thickness Uniform, appearance and seamless no difference. Seen in this light, bend pipe joints have been completed seamless transition.


Tension reduction In the vertical heat pipe on-line removal of internal and external burrs, the overall heating type change and a series of new technology processing, so it has been a qualitative leap in high pressure, can be widely used in the wild, longitudinal only limited water and low pressure gas Transmission environment.