Surface processing of stainless steel

3. Standard surface processing

Many kinds of surface finishes have always been indicated by numbers or other classification methods, and they have been incorporated into relevant standards, such as: “British Standard BS1449” and “American Iron and Steel Association Stainless Steel Producer Committee Standard”.

4. Rolling surface processing

There are three basic rolling surface finishes for plates and strips, which are represented by the production process of plates and strips.

No.1: After hot rolling, annealing, pickling and descaling. The surface of the treated steel plate is a dull surface, a bit rough.

No.2D: It has a better surface finish than N0.1, and it is also a dull surface. After cold rolling, annealing, descaling, and finally light rolling with a matt roller.

No.2B: This is the most commonly used in construction applications. Except for the last light cold rolling with a polishing roll after annealing and descaling, the other processes are the same as 2D, the surface is slightly shiny, and it can be polished.

No.2B Bright Annealing: This is a reflective surface, which is rolled by polishing rolls and final annealed in a controlled atmosphere. Bright annealing still maintains its reflective surface and does not produce oxide scale.

Because no oxidation reaction occurs during the bright annealing process, no pickling and passivation treatments are needed.

5. Polished surface processing

No. 3: Represented by 3A and 3B. ”

3A: The surface is evenly ground, and the abrasive grain size is 80″100.

3B: The rough surface is polished, and the surface has uniform straight lines. It is usually made by polishing with an abrasive belt with a grain size of 180″200 on a 2A or 2B plate at one time.

No.4: Unidirectional surface processing, low reflectivity, this surface processing may be the most widely used in architectural applications. The process step is to first polish with coarse abrasives, and finally grind with abrasives with a particle size of 180.

No.6: It is a further improvement to No.4, which is to polish the surface of No.4 with Tampico polishing brush in abrasive and oil medium. This surface finish is not included in “British Standard 1449”, but it can be found in American Standards.

No.7: It is called bright polishing, which polishes the surface that has been ground very fine but still has abrasion marks.

Usually used is 2A or 2B board, with fiber or cloth polishing wheel and corresponding polishing paste.

No.8: Mirror polished surface, high reflectivity, usually called mirror surface processing, because it reflects very clear images.

Polish the stainless steel continuously with a fine abrasive, and then polish it with a very fine polishing paste.

In architectural applications, it should be noted that this surface will leave fingerprints if it is used in places where there is a large flow of people or people often touch.

Handprints can of course be wiped off, but they sometimes affect the appearance.

The surface finishes described in the “official” standards and literature are only general introductions, and samples can most intuitively indicate the types of surface finishes. Polishing or metal finishing manufacturers will provide samples of various surface finishes, and users should discuss with them.