The production process of seamless steel pipe||The seamlessness of steel pipe is mainly completed by tension reducing, which is a continuous rolling process of hollow base material without mandrel. Under the premise of ensuring the welding quality of the main pipe, the welded pipe tension reducing process is to heat the welded pipe as a whole to above 950 degrees Celsius, and then roll it to various outer diameters and walls by a tension reducer (the tension reducer has 24 passes) For thick finished pipes, the hot-rolled steel pipes produced by this process are essentially different from ordinary high-frequency welded pipes.
After being heated by the heating furnace, the metallographic structure and mechanical properties of the weld and the parent body can be completely consistent. In addition, through multiple passes The secondary tension reducing machine rolling and automatic control make the dimensional accuracy of the steel pipe (especially the roundness and wall thickness accuracy of the pipe body) better than similar seamless pipes. The fluid pipes produced in developed countries in the world have adopted a large number of welded pipe seamless technology in boiler pipes. With the development of society, the situation of domestic hot-rolled welded pipes gradually replacing seamless pipes has taken shape.
