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Introduction of polishing technology for seamless stainless steel pipes

The wide range of surface finishes in stainless steel broadens its field of application – different surface finishes make stainless steel surfaces different, making them unique in their applications.
In the field of architectural applications, the surface processing of seamless stainless steel pipes is important for a number of reasons.
A corrosive environment requires a smooth surface because the surface is smooth and not easily fouled. The deposition of dirt can rust or even cause corrosion of the stainless steel.
In the spacious hall, stainless steel is a commonly used material for elevator decorative panels. Although the surface fingerprint can be wiped off, it affects the appearance, so it is good to choose a suitable surface to prevent fingerprints.
Hygienic conditions are important in many industries, such as food processing, catering, brewing, and chemicals. In these applications, the surface must be easily cleaned daily, and chemical cleaners are often used.
Stainless steel is a good material for this. In public places, the surface of stainless steel is often ridiculed, but one of its important characteristics is that it can be washed away, which is a remarkable feature of stainless steel over aluminum. The surface of aluminum tends to leave traces and is often difficult to remove. When cleaning the stainless steel surface, it should be cleaned along the lines of stainless steel, because some surface processing lines are unidirectional.
Seamless stainless steel tubing is suitable for hospitals or other areas where hygienic conditions are critical, such as food processing, catering, brewing and chemicals, not only because it facilitates daily cleaning, but sometimes with chemical cleaners, and because it is not easy Breeding bacteria. Tests have shown that stainless steel has the same properties as glass and ceramics in this respect.
1. Natural appearance of stainless steel
Stainless steel gives a natural, sturdy, natural feel that gently reflects the color of the surroundings.
2. Basic types of surface processing
There are roughly five types of surface finishes that can be used for stainless steel, which can be combined to transform more end products.
There are five types: rolling surface processing, mechanical surface processing, chemical surface processing, textured surface processing, and colored surface processing.
There are also some special surface finishes, but regardless of which surface finish is specified, the following steps should be followed:
1 Work with the manufacturer to agree on the required surface finish, and prepare a sample as a standard for future mass production.
2 When using in large area (such as composite board, it must be ensured that the same type of base coil or coil is used.
3 In many architectural applications, such as the interior of the elevator, although the fingerprint can be wiped off, it is not beautiful. If you choose a textured surface, it is not so obvious.

4 When selecting the surface processing, the manufacturing process should be considered. For example, in order to remove the beads, it is necessary to repair the weld and restore the original surface processing.
The tread plate is difficult or even impossible to meet this requirement.
5 For some surface processing, grinding or polishing lines are directional, known as one-way. If the texture is made to be vertical rather than horizontal, the dirt is less likely to adhere to it and is easy to clean.
6 No matter which kind of finishing is used, it is necessary to increase the process steps, so increase the cost, so choose the surface plus
Work hours should be cautious.
Therefore, architects, designers, and manufacturers need to have an understanding of the surface finish of stainless steel. Through friendly cooperation and mutual communication with each other, we will surely achieve the desired results.
7 Based on our experience, we do not recommend the use of alumina as an abrasive unless careful during use. It is good to use silicon carbide abrasives.

3. Standard surface processing

Many types of surface processing have been represented by numbering 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 Producers Committee Standard”.

4. Rolling surface processing

There are three basic rolling surface finishes for sheet and strip, which are expressed by the production process of the sheet and the village.
No. 1: Hot rolled, annealed, pickled, and descaled. The treated steel sheet surface is a dull surface and is somewhat rough.
No.2D: It is better than the surface of N0.1 and is also a dull surface. After cold rolling, annealing, descaling, and then light rolling with a matte roll.
No.2B: This is commonly used in architectural applications. It is the same as 2D except for the subsequent cold rolling with a polishing roller after annealing and descaling. The surface is slightly illuminated and can be polished.
No. 2B Bright Annealing: This is a reflective surface that is rolled by a polishing roll and subjected to a final annealing in a controlled atmosphere. Bright annealing still maintains its reflective surface and does not produce scale.
Since the oxidation reaction does not occur during the bright annealing process, it is not necessary to perform pickling and passivation treatment.

5. Polished surface processing

No. 3: It is represented by 3A and 3B. “
3A: The surface is uniformly ground, and the abrasive grain size is 80 to 100.
3B: The matte surface is polished, and the surface has a uniform straight line. Usually, it is formed by polishing the belt with a particle size of 180-200 on the 2A or 2B board.
No.4: Unidirectional surface processing, low reflectivity, this surface processing may be versatile in architectural applications. The process steps are first polished with a coarse abrasive and then with an abrasive having a particle size of 180.
No.5: A further improvement to No. 4, which is polished with a Tampico polishing brush in abrasive and oil media. 4 surface. This surface finish is not available in “British Standard 1449”, but can be found in the US standard.
No.6: Known as bright polishing, it polishes the surface that has been ground very fine but still has scratch marks.
Typically 2A or 2B plates are used, with fiber or cloth polishing wheels and corresponding polishing pastes.
No.7: Mirror-finished surface with high reflectivity, often referred to as mirror-surface finish, because the image it reflects is sharp.
The stainless steel pipe is continuously polished with a fine abrasive and then polished with a very fine polishing paste.
It should be noted in architectural applications that such surfaces can be left handprints if used in places where people are heavily mobile or where people often touch them.
The fingerprint can of course be erased, but sometimes it affects the appearance. 
Source: China Seamless Stainless Steel Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)

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