How to correct the tortuosity of EN10297-1 E355 seamless pipes

The production process of EN10297-1 E355 seamless pipe is mainly accomplished by stretch reducing. The stretch reducing process is a continuous rolling process without the mandrel of the hollow base metal. In the process of rolling, E355 steel pipes are often tortuous and not straight. What is the correct way to correct the tortuosity of EN10297-1 E355 seamless pipes?

The tortuosity of EN10297-1 E355 seamless pipes is due to improper adjustment of rolling mill, residual residual stress during rolling and the cause of unequal cooling along the section and length of the pipe. Therefore, no straight pipe can be obtained directly from the mill, so long as the cold tortuosity of the pipe is straightened, the skill conditions are satisfied.

The basic principle of straightening is to make the EN10297-1 E355 seamless pipes elastic-plastic twists and twists and tortuosity, so that the steel pipe in the straight machine must be repeated and tortuous. The degree of repeated twists and turns of the E355 steel pipe is mainly determined by the adjustment of straightening machine.