The steel-plastic composite pipe is made of seamless steel pipe or hot-dip galvanized steel pipe as the base, and the inner wall (the outer wall can also be used when needed) is coated with plastic by powder melt spraying technology, and has excellent performance.

Resistance welding is a method of applying pressure through electrodes after combining the workpieces, and using electric current through the contact surface of the joint and the resistance heat generated in the adjacent area to weld.

Industrial control of cold drawn precision seamless steel pipe production includes condition control such as die design, annealing, pickling, lubrication, etc. At the same time, capillary quality inspection and maintenance work should also be carried out.

The process properties of SSAW steel pipe include bending, surface quality, size, shape, weight and allowable deviation

Boiler tube is a type of seamless tube. The manufacturing method is the same as that of seamless pipes, but there are strict requirements on the steel grades used to manufacture steel pipes. According to the temperature of use, it is divided into two types: general boiler tubes and high-pressure boiler tubes.

For hot-rolled thin-walled seamless pipes with rough product defects, inspection before rolling is to find surface abnormalities. However, after grinding and pickling, it was found that there were "dark spots" on the surface of the tube blank. Metallographic examination showed that the dark spots corresponded to coarse grains.