Purpose and Advantages of Bright Annealed Tubes
Apr 27, 2022| 1. Eliminate work hardening and obtain satisfactory metallographic structure. When the performance requirements are different, the requirements for the metallographic structure of the bright annealed tube are different, and the process of bright heat treatment is also different.
2. Obtain an oxidation-free bright surface with good corrosion resistance. Since the bright annealing tube heats the strip under the protective atmosphere of a mixed gas of hydrogen and nitrogen, a bright surface without oxidation is obtained by strictly controlling the protective atmosphere in the furnace, especially the purity, residual oxygen and dew point. Compared with the surface obtained by ordinary annealing and pickling, since there is no oxidation process, the phenomenon of poor chromium on the surface of the strip is reduced, and its corrosion resistance is better than that of the 2B plate after polishing.
3. Bright treatment maintains the smoothness of the rolling surface, and a bright surface can be obtained without post-processing. Since the surface of the steel strip retains the original metallic luster after bright annealing, a bright surface close to the mirror surface has been obtained. Under general requirements, the surface can be directly used without processing.
4. Strip steel with special rolling pattern surface can be developed. Since the surface of the steel strip is not changed during the annealing process, the rolling surface pattern can be completely retained, and the cold-rolled special pattern strip can be easily developed.
5. There is no pollution problem caused by ordinary pickling methods. The annealed strip does not need pickling or similar treatment, and various media such as acid are not used, and there is no pollution problem caused by pickling.
6. Realize the control of the shape of the plate. Since the bright annealing tube furnace design allows segmental adjustment along the width direction of the strip, the cooling rate in the width direction of the strip can be adjusted by air flow diversion to achieve online control of the shape of the strip.