Blank tube cleaning
Sometimes, due to accidents during continuous casting, pouring, or forging, there are small scars or pits or grooves in the surface of the billet, and there are still cracks in individual billets. In order to improve the quality of finished steel pipes, reduce waste, and subsequent processing procedures, it is necessary to clean the surface of the tube blank. Production plants with blank pickling conditions can clean the defective parts after the billet is pickled to remove the surface oxide scale; production plants without pickling conditions can use surface shot blasting (sand) to remove the surface oxidation of the blanks The iron sheet then cleans its defective parts; some manufacturers clean the defective parts of the blank directly after visual inspection. The main cleaning methods are flame and sanding. Steel grades that are more sensitive to cracks, such as high alloy steel, are generally cleaned by sanding; for carbon steel and other steel that is not sensitive to cracks, flame cleaning can be used.
Some special steel grades, such as stainless steel, need to be cleaned by surface peeling.