The production process of 20# seamless steel pipe can be divided into cold drawing and hot rolling. The production process of cold rolling 20# seamless steel pipe is generally more complicated than that of hot rolling. The tube billet must first be subjected to three-roll continuous rolling, and then the sizing test shall be carried out after extrusion.
Then enter the annealing process. Annealing should be pickled with acidic liquid. When pickling, pay attention to whether there is a large amount of foaming on the surface. If there is a large amount of foaming, it means that the quality of the steel pipe cannot meet the corresponding standards. In appearance, the cold-rolled 20# seamless steel pipe is shorter than the hot-rolled 20# seamless steel pipe. The thickness of the cold-rolled 20# seamless steel pipe is generally smaller than the hot-rolled 20# seamless steel pipe, but the surface looks brighter than the thick police 20# seamless steel pipe. D hot car 20# seamless steel pipe main production process (4 main inspection process):
Tube billet preparation and inspection 4-tube billet heating and piercing-rolling tube heating must be reduced)-heat treatment 4-+finished tube straightening-finishing inspection 4 (non-destructive, physical and chemical, Taiwan inspection)-
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@Cold rolling (pulling) 20# seamless steel pipe main production process:
Billet preparation, pickling and lubrication, cold rolling (drawing) heat treatment straight-finishing inspection, steel pipes made of a whole piece of metal, without seams on the surface, are called 20# seamless steel pipes.
