1. Construction preparation(1) Working conditionsThe ground of the pipeline trench is completed; the bricklaying of the pipeline well is completed.(2) Material requirementsVarious specifications and models of pipes are complete.(3) Main machinery and toolsCutting machine, polishing machine, electric

1. Forging steel: a pressure processing method that uses the reciprocating impact force of the forging hammer or the pressure of the press to change the blank into the shape and size we need.2. Extrusion: It is a processing method in which the steel is placed in a closed extrusion tube, and pressure

There are two possibilities for the formation of surface defects of spiral steel pipes: one is that the material itself is not plastic during the deformation process, resulting in the formation of cracks and external folds; the other is that the surface of the material is oxidized to cause surface d

The thick-walled straight seam steel pipe is a steel pipe made by rolling the long steel strip of the specification into a round tube shape and welding the straight seam by a high-frequency welding unit. The shape of the steel pipe can be round, square, or special, it depends on the sizing rolling a