The basic characteristic of the production of A106B honed tube is that before the cold deformation and the accumulated cold deformation of the pipe material reach a certain level, the in-process product must carry out a series of preparatory work in order to eliminate the work hardening and other needs before continuing the cold deformation. Tube production from production to processing into finished products usually undergo multiple cold deformation, and the entire production process often contains a number of production cycles consisting of preparation and deformation processes, cycle reciprocating, long production cycle, large metal consumption; For monomer arrangement, it is generally intermittent production.
The pipe material must be carefully inspected, and its surface must not have harmful defects such as wrinkles, cracks, crusting, slashing, etc.; the size should meet certain requirements, such as hot rolling. For quality control, the outer diameter tolerance is about 1-1.5%, the thickness tolerance is about one (10-15)%, + (10-12.5)%; the bending is generally not more than 1.5-2 mm/m; It should be straight and free of burrs; if burrs are to be removed, this is especially important for cold rolled tubes. In addition, the chemical composition and mechanical properties of the pipe should meet the requirements in the technical conditions.
Generally, the surface of the pipe should be pickled before inspection. Minor defects can be repaired. A peeling lathe, a centerless grinder, a hand-held or a hanging grinder can be used to repair the outer surface defects. The grinding of the inner surface defects can be carried out on a dressing machine such as an inner boring machine. Since the surface defects are continuously enlarged during the cold deformation process, and the grinding of the inner surface defects is more difficult as the pipe diameter is reduced during production, the surface defects of the pipe material should be eliminated as much as possible before the cold working.