The surface processing of stainless steel sheet have NO.1, 2B, No. 4, HL, No. 6, No. 8, BA, TR hard, Rerolled bright 2H, polishing 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 the stainless steel sheet. It is to remove the black oxide scale produced during hot rolling and heat treatment by pickling or similar treatment methods. This is No. 1 surface processing. The No.1 surface is silvery white and matt. Mainly used in heat-resistant and corrosion-resistant industries that do not require surface gloss, such as alcohol industry, chemical industry and large containers.

2B: The surface of 2B is different from the 2D surface in that it is smoothed with 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 processing type. This kind of stainless steel sheet surface is the most versatile, suitable for general purposes, which is widely used in the chemical, paper, petroleum, medical and other industries, and can also be used as a building curtain wall.

TR Hard Finish: TR stainless steel is also called hard steel. Its representative steel grades are 304 and 301, they are used for products that require high strength and hardness, such as railway vehicles, conveyor belts, springs and gaskets. The principle is to use the work hardening characteristics of austenitic stainless steel to increase the strength and hardness of the steel plate by cold working methods such as rolling. The hard material uses a few percent to several tens of percent of the mild rolling to replace the mild flatness of the 2B base surface, and no annealing is carried out after rolling. Therefore, the TR hard surface of the hard material is the rolled after cold rolling surface.

Rerolled Bright 2H: After the rolling process. the stainless steel sheet will be processed bright annealing. The strip can be fast cooled by the the continuous annealing line. The traveling speed of the stainless steel sheet on the line is around 60m~80m/min. After this step, the surface finish will be 2H rerolled bright.

No.4: The surface of No. 4 is a fine 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 with 2 D or 2 B surface as the base and polishing with abrasive belt with a grain size of 150-180# Machined 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.

HL: HL surface is commonly called hairline finish. Japanese JIS standard stipulates that 150-240# abrasive belt is used to polish the continuous hairline-like abrasive surface obtained. In China’s GB3280 standard, the regulations are rather vague. HL surface finish is mostly used for building decoration such as elevators, escalators, and facades.

No.6: The surface of No. 6 is based on the surface of No. 4 and is further polished with a Tampico brush or abrasive material with a particle size of W63 specified by GB2477 standard. This surface has a good metallic luster and soft performance. 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 fringe decorations, and also widely used as kitchen utensils.

BA: BA is the surface obtained by bright heat treatment after cold rolling. Bright heat treatment is annealing under a protective atmosphere that guarantees that the surface is not oxidized to preserve the gloss of the cold-rolled surface, and then use a high-precision smoothing roll for light leveling to improve the surface brightness. This surface is close to a mirror finish, and the surface roughness Ra value measured by the instrument is 0.05-0.1μm. BA surface has a wide range of uses and can be used as kitchen utensils, household appliances, medical equipment, auto parts and decorations.

No.8: No.8 is a mirror-finished surface with the highest reflectivity without abrasive grains. The stainless steel deep processing industry also calls as 8K plates. Generally, BA materials are used as raw materials for mirror finishing only through grinding and polishing. After mirror finishing, the surface is artistic, so it is mostly used in building entrance decoration and interior decoration.

Stainless steel is a durable and versatile material with a wide range of industrial applications, from construction to kitchenware. The surface of the stainless steel plate is particularly important because it directly affects the strength, appearance and corrosion resistance of the material.

Stainless steel is made by combining iron, chromium, and some other metals. The corrosion resistance of stainless steel is due to the formation of a thin protective layer of chromium oxide on the surface. This oxide layer, called a passivation film, is formed when chromium reacts with oxygen in the air or water.

The quality of the passive film on stainless steel surfaces depends on how the metal is manufactured, processed and maintained. Any imperfection on the surface, such as scratches, dents or roughness, can disrupt the film, allowing moisture and oxygen to penetrate the metal and cause corrosion.

To ensure the best quality stainless steel surface, various processes can be used. Passivation is a technique that involves cleaning metal and then exposing it to a controlled chemical process that increases the thickness of an inactive film. Electropolishing is another process for smoothing and polishing the surface of stainless steel to remove surface defects.

Regular cleaning is also essential to maintain the quality of stainless steel surfaces. Cleaning removes dirt, grime and any other contaminants that can cause corrosion. It is recommended to use a non-abrasive cleaner and a soft cloth to protect the metal surface during cleaning.

Surface coatings can also be used to further protect the surface of the stainless steel plate. These coatings provide additional protection against corrosion from harsh environments, chemicals and weathering.

To sum up, the surface of the stainless steel plate is a key factor affecting the performance and life of the material. Regular maintenance and cleaning, as well as the use of passivation or electropolishing techniques can ensure the best quality stainless steel surface. When cared for properly, stainless steel plate can provide durability and aesthetics for a variety of industrial applications.