What are the surface treatments for stainless steel coils?

The surface treatment of stainless steel coils includes NO.1, 2B, NO. 4, H, NO. 6, NO. 8, BA, TR hard, re-coiled bright 2H, polished bright and other surface finishes, etc.

NO.1: No. 1 surface refers to the surface obtained by heat treatment and pickling after hot rolling of stainless steel strip. . It is to remove the black oxide scale produced during hot rolling and heat treatment by pickling or similar treatment methods. This is not. 1 surface treatment. The surface of No. 1 is silvery white matte. It is mainly used in heat-resistant and corrosion-resistant industries that do not require high surface gloss, such as the wine industry, chemical industry and large containers.
2B: The difference between the surface of 2B and the surface of 2D is that it is smoothed by a smooth roller, so it is brighter than the 2D surface. The surface roughness Ra value measured by the instrument is 0.1~0.5μm, which is the most common type of treatment. This type of stainless steel strip surface is the most widely used, suitable for general purposes, widely used in chemical, paper, petroleum, medical and other industries, and can also be used as building curtain walls.
TR hard surface treatment: TR stainless steel is also called hard steel. Its representative steel grades are 304 and 301, which are used for products that require high strength and hardness, such as railway vehicles, conveyor belts, springs and washers. The principle is to use the work hardening characteristics of austenitic stainless steel to increase the strength and hardness of the steel plate through cold working methods such as rolling. . Hard materials use mild rolling of several percent to tens of percent to replace the mild and flat surface of 2B base surface, and no annealing is performed after rolling. Therefore, the TR hard surface of hard materials is the rolled surface after cold rolling.
Rerolling Bright 2H: After rolling. The stainless steel strip will be bright annealed. The strip can be quickly cooled by a continuous annealing line. The travel speed of the stainless steel strip on the production line is about 60m~80m/min. After this step, the surface finish will be 2H rerolling bright.
No. 4: The surface of No. 4 is a finely polished surface finish that is brighter than the surface of No. 3. It is also obtained by polishing the stainless steel cold rolled stainless steel plate 2 or 2 with the B surface as the base and a particle size of 150-180# as the processing surface. The surface roughness Ra value measured by the instrument is 0.2~1.5μm. NO.4 surface is widely used in restaurant and kitchen equipment, medical equipment, architectural decoration, containers, etc.
H: HL surface is commonly known as hairline finish. Japanese JIS standard stipulates that 150-240# sanding belt is used for polishing to obtain a continuous hairline abrasive surface. In China's GB3280 standard, the regulations are relatively vague. HL surface treatment is mostly used for building decoration such as elevators, escalators, and exterior walls.
No. 6: The surface of No. 6 is based on the surface of No. 4 and is further polished with a Tampico brush or an abrasive material with a particle size of W63 as specified in the GB2477 standard. This surface has good metallic luster and soft properties. The reflection is weak and does not reflect the image. Due to this good property, it is very suitable for making building curtain walls and building edge decorations, and is also widely used as kitchen utensils.
BA: BA is a surface obtained by bright heat treatment after cold rolling. Bright heat treatment is annealing under a protective atmosphere to ensure that the surface is not oxidized and maintain the gloss of the cold-rolled surface, and then polishing with a high-precision smooth roller to improve the surface brightness. This surface is close to mirror finish, and the surface roughness Ra value measured by the instrument is 0.05-0.1μm. BA surface is widely used and can be used as kitchen utensils, household equipment, medical equipment, auto parts and decorations.
No.8: No.8 is the mirror surface with the highest reflectivity without abrasive particles. It is also called 8K plate in the stainless steel deep processing industry. Generally speaking, BA material is only used as raw material for mirror processing through grinding and polishing. After mirror processing, the surface is very artistic, so it is mainly used for building entrance decoration and interior decoration.