Stainless steel plate surface process
1. Stainless steel plate process flow
Stainless steel plate process flow: If it is an annealed stainless steel plate, you should first use NG-9-1 to chemically remove the black scale. If there is oil stain, first use NZ-B oil remover to remove the oil → wash with water → electrolyte polishing (this liquid is directly used as a working fluid) Use, the temperature is 60~80℃, the workpiece is hung with anode, current Da: 20~15A/dm2, the cathode is lead-antimony alloy (containing 8% antimony) time: 1~10 minutes, until polished) → water washing → 5~8 % hydrochloric acid to remove the film (room temperature: 1 to 3 seconds) → wash with water → blow dry.
Note: The clamp is made of aluminum or titanium metal, which requires good electrical conductivity; the new solution must be electrified and aged before use.
Stainless steel plate surface process:
The various surface treatments of stainless steel plates have broadened its application fields. Different surface treatments make the surfaces of stainless steel plates different, making them unique in their applications.
Corrosive environments require smooth surfaces because smooth surfaces are not prone to fouling. The deposition of dirt can cause stainless steel plates to rust or even cause corrosion.
In spacious halls, stainless steel plates are the most commonly used material for elevator decorative panels. Although fingerprints on the surface can be wiped off, they affect the appearance, so it is best to choose a suitable surface to prevent fingerprints from leaving.
Hygienic conditions are important in many industries, such as food processing, catering, brewing and chemical industries. In these applications, surfaces must be easy to clean every day, and chemical cleaning agents are often used.
Stainless steel plates are the best material in this regard. In public places, the surface of stainless steel plates is often scrawled with graffiti. However, one of its important features is that they can be washed away. This is a significant advantage of stainless steel plates over aluminum. Features. The surface of aluminum tends to leave marks, which are often difficult to remove. When cleaning the surface of the stainless steel plate, you should clean it along the lines of the stainless steel, because some surface processing lines are one-way.
Stainless steel plates are most suitable for use in hospitals or other areas where hygiene is critical, such as food processing, catering, brewing and chemical industries. This is not only because it is easy to clean every day, sometimes using chemical cleaning agents, but also because it is not easy to breed. bacteria. Tests have shown that stainless steel plates perform the same as glass and ceramics in this regard.
Stainless steel panels give people a natural, solid and bright feel, and their natural colors softly reflect the colors of the surrounding environment.
2. Basic types of surface processing
There are roughly five surface treatments that can be used for stainless steel plates, and they can be combined to transform more final products.
The five categories are: rolling surface processing, mechanical surface processing, chemical surface processing, textured surface processing and colored surface processing.
There are also specialized finishes, but no matter which finish you specify, the following steps should be followed:
① Agree with the manufacturer on the required surface processing. It is best to prepare a sample as a standard for future mass production.
② When used in large areas (such as composite panels), it must be ensured that the base coils or coils used are from the same batch.
③In many construction applications, such as inside elevators, although fingerprints can be wiped off, they are very unsightly. If you choose a cloth surface, it will not be so obvious.
Mirror stainless steel must not be used in these sensitive areas.
④ The manufacturing process should be taken into consideration when selecting surface processing. For example, in order to remove weld beads, the weld may need to be ground and the original surface processing must be restored.
Patterned boards are difficult or even impossible to meet this requirement.
⑤ For some surface processing, grinding or polishing, the texture is directional and is called unidirectional. If the lines are made vertical rather than horizontal when used, dirt will be less likely to adhere to it and it will be easier to clean.
⑥No matter what kind of finishing is used, additional process steps are required, thus increasing costs. Therefore, be careful when choosing surface processing. Therefore, relevant personnel such as architects, designers, and manufacturers need to understand the surface processing of stainless steel. Through friendly cooperation and mutual exchanges, the desired results will be achieved.
⑦Based on our experience, we do not recommend using aluminum oxide as abrasives unless great care is taken during use. It is best to use silicon carbide abrasives.
3. Standard surface processing Many types of surface processing have been represented by numbers or other classification methods, and they have been incorporated into relevant standards, such as British Standard BS1449 and American Iron and Steel Institute Stainless Steel Producers Committee standards.
4. Rolled Surface Processing of Sheet and Strip There are three basic types of rolled surface processing which are represented by the production process of sheet and strip.
No.1: Hot rolled, annealed, pickled and descaled. The surface of the treated stainless steel plate is a dull surface and a bit rough.
No.2D: The surface processing is better than that of N0.1 stainless steel plate, and it also has a dull surface. After cold rolling, annealing, descaling, and finally light rolling with matte rollers.
No.2B: This is the most commonly used in construction applications. Except for the final light cold rolling with a polishing roller after annealing and descaling, the other stainless steel plate processes are the same as 2D. The surface is slightly shiny and can be polished.
No.2B Bright Annealed: This is a reflective surface that is rolled with polishing rollers and final annealed in a controlled atmosphere. Bright annealing still maintains its reflective surface and does not produce scale.
Since no oxidation reaction occurs during bright annealing, pickling and passivation treatments are not required.
5. polished surface processing
No.3: Represented by 3A and 3B.
3A: The surface is evenly ground, and the abrasive grain size is 80 to 100.
3B: Matt surface polishing, with uniform straight lines on the surface. It is usually polished once on a 2A or 2B stainless steel plate with an abrasive belt with a grit size of 180 to 200.
No. 4: One-way surface finish, not very reflective, this finish is probably the most versatile in architectural applications. The process steps are to first polish with coarse abrasives, and finally grind with 180 grit abrasives.
No.6: It is a further improvement on the No.4 stainless steel plate. It is polished with a Tampico polishing brush in abrasive and oil media. No.6. 4 surfaces. This surface treatment is not included in British Standard 1449, but can be found in American standards.
No.7: It is called bright polishing, which is polishing the surface that has been ground very finely but still has grinding marks.
Usually 2A or 2B stainless steel plates are used, with fiber or cloth polishing wheels and corresponding polishing pastes.
No.8: Mirror polished surface, high reflectivity, often called mirror stainless steel plate surface processing, because the reflected image is very clear.
The stainless steel plate is continuously polished with fine abrasives and then polished with very fine polishing paste.
In architectural applications, it should be noted that such surfaces may leave fingerprints if used in areas with high traffic or where people touch them frequently.
Fingerprints can of course be erased, but sometimes they affect the appearance.
The surface processing described in official standards and literature is only a general introduction, and samples can most intuitively represent the types of surface processing. Polishing or metal finishing manufacturers will provide samples of various surface finishes and users should discuss them with them.
6. Surface roughness
The classification of rolled surface processing and polished surface processing indicates the degree to which it can be achieved. Another effective expression method is the measurement of surface roughness. The standard measurement method is called CLA (Centre Line Average), in which the measuring instrument moves laterally across the surface of the steel plate and records the amplitude of the peak and valley changes. The smaller the CLA number, the smoother the surface.
