Welded pipe refers to a steel pipe or steel plate that is bent and deformed into a round, square or other shape and then welded into a seam on the surface. The blanks for welded pipes are steel sheets or strips. How to weld steel strips or steel plates together, and what are the welding skills? ‎

Bending degree means that the black steel seamless pipe is curved in the length direction, and its curve degree is expressed by numbers. The curvature specified by the standard is generally divided into the following two types: local bending degree and the total bending degree of the whole length.

Heat treatment processing of black steel seamless pipes is widely used, so it is necessary to understand the safe operation of heat treatment processing, so as to ensure their own safety and also ensure product quality.

The ssaw steel pipe adopts the advanced double-sided submerged arc welding process. When welding, it should be ensured that the weld bead has no impurities, no misalignment, and no welding defects such as incomplete penetration.

In the production process of cold drawn seamless tubing, there are work hardening and hydrogen embrittlement, which are the main reasons for the cracking of cold drawn seamless tubing.

The external factors that affect the compressive strength of seamless pipes are temperature, strain rate, and in-situ stress.