Petroleum steel pipe is a kind of long steel with hollow section and no joints around it, and petroleum cracking pipe is an economical section steel. Function: Widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames and steel scaffolding used in construction. The use of petroleum cracking pipes to manufacture annular parts can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipe manufacturing. The oil cracking tube is also an indispensable material for various conventional weapons, and the barrel, barrel, etc. must be manufactured by the oil cracking tube. Petroleum cracking pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Since the area of the oil cracking pipe is the largest under the condition of equal perimeter, more fluids can be transported by the circular pipe.


Why should the pipe end be thickened during production of petroleum steel pipes and geological steel pipes? Pipe end thickening is mainly used for petroleum steel pipes and geological steel pipes. Due to the thinning of the pipe wall after the pipe end is threaded, the threaded connection part becomes the weak link in the strength of the entire pipe body. In order to improve the strength of the threaded connection part, the method of thickening the pipe end is used to increase the wall thickness of the pipe end.


In addition, the drill pipe is mostly connected by butt welding between the pipe end and the tool, and the weld and its heat affected zone are the weak links of strength. In order to improve the strength of the weld area, pipe end thickening is also generally used. There are three types of pipe end thickening: inner thickening, outer thickening and inner and outer thickening. In addition, according to production needs, one end of the drill pipe is a male tool joint, and the other end is a female tool joint. It is required to connect the drill pipe body and the male and female tool joints into a joint by welding. In order to increase the strength of the weld, both ends of the drill pipe body should be thickened before welding. Drill pipe (pipe) mostly uses pipe end and tool to weld the welding area, welding and its heat-affected zone are weak links in strength. In order to improve the strength of the weld area, pipe end thickening is also generally used.