Difference between hot stretch reducing pipe and the Longitudinal seam welded pipe

Because by its manufacturing process constraints, the cost of production of seamless steel tube has been high, resulting in the gradual decline of its economic benefits. With the Chinese metallurgical industry advances in technology, new product instead of seamless steel pipe hot stretch reducing began to emerge. Here is the difference between the new product and Longitudinal:

1, seam welded directly determines the quality of the quality, but also where the biggest difference between ERW and seamless. Longitudinal high-frequency welding, seam straight sets carbon can not be eliminated, the weld interface together with the parent only, and not completely fused into one, unable to withstand the test of time and pressure. Hot stretch reducing high-frequency welded steel pipes go through the whole heating temperature of 800 degrees, the overall annealing, and then open the change process, through this series of processes, the weld performance has the same parent organization, completely fused into one , well done from a seam to the seamless transition.

2, the process resulting in a product of different quality differences, hot stretch reducing high frequency welded steel pipes in a Longitudinal also carried out after the process is not carried out, both inside and outside burr removal online. The existence glitch affects the flow of fluid inside the tube, blocking the flow of burr Neptune Casino normal flow of the body, resulting in whirlpool. According to principles of fluid mechanics, the weld must increase local compression, discontinuity of the pipe safety factor is also greatly reduced, hot stretch reducing steel production process to take full account of the risks that exist burr, burr removal to limit, thus make uniform thickness, seamless appearance with no difference. So from this point of view, hot stretch reducing pipe joints from having also completed a seamless transition to.

Hot stretch reducing pipe in Longitudinal carried out on the basis of clear internal and external burrs online, the overall heating type variable and a series of new processing technology, so that it has been a qualitative leap in the field of the widespread use of high-pressure, the Longitudinal only limited water under low pressure gas transmission.