1. The trademark and printing of the high-quality tube are comparable to the standard.2. The composition of high-quality steel is uniform, the tonnage of the cold shearing machine is high, and the end face of the cutting head is smooth and regular, while the inferior material often has the appearanc

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

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

1. Reasonable selection of materials. For precision and messy molds, micro-deformation mold steels with good materials should be selected, and mold steels with serious carbide segregation should be reasonably cast and quenched and tempered. Reasonable selection of heating temperature and control of