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Stainless steel preheating process, surface treatment process, polishing process
Stainless steel preheating process
1. Stainless steel process: If it is annealed stainless steel should first use NG-9-1 chemistry to black, oil first use the NZ-B degreasing Wang to oil → washing → electrolytic polishing (this solution is the working fluid directly The temperature is 60 ~ 80 ℃, the workpiece is hung anode, the current is Da: 20 ~ 15A / dm2, the cathode is lead-antimony alloy with 8% antimony time: 1 ~ 10minutes, % Hydrochloric acid back to the film (room temperature: 1 ~ 3 seconds) → washing → drying. Note: The fixture with aluminum or titanium, requires good electrical conductivity; new solution power aging stainless steel surface treatment process: a variety of surface treatment of stainless steel to broaden its application areas - different surface processing so that stainless steel surface Different, so that each has its own unique in the application.
Corrosion environment requires a smooth surface because the surface is not easy to scale fouling. The deposition of dirt can rust stainless steel or even cause corrosion.
In the spacious hall, stainless steel is the most commonly used materials for elevator trim, although the surface of the handprints can be erased, but the impact on the beautiful, it is best to use the appropriate surface to prevent leaving fingerprints.
Hygienic conditions are important for many industries such as food processing, catering, brewing and chemical where the surfaces must be cleansed daily and chemical cleaners are often used.
Stainless steel is the best material in this area. Stainless steel surfaces are often sketched in public places, but one of its key features is the ability to clean them, a notable feature of stainless steel over aluminum. Aluminum surface easily leave traces, often difficult to remove. Stainless steel clean up the surface should be cleaned along the lines of stainless steel, because some of the surface processing is unidirectional texture.
Stainless steel is best suited for hospitals or other areas where hygiene is critical, such as: food processing,
Catering, brewing and chemicals, not only because it is convenient for daily cleaning, sometimes for chemical cleaning, but also because it is not easy to breed bacteria. Experiments show that the performance of stainless steel in this area and glass and ceramics the same.
Stainless steel gives a natural sense of sturdiness and beauty, its natural color gently reflects the color of the surrounding environment
2. The basic types of surface processing
There are roughly five types of surfaces that can be used for stainless steel, and they can be combined to transform more of the final product.
Five categories are: rolling surface processing, mechanical surface processing, chemical surface processing, textured surface processing and color surface processing.
There are some special surface finishes, but whatever surface finishes you specify, you should follow these steps:
① with the manufacturer agreed on the need for surface preparation, the best preparation of a sample, as the future standard mass production.
② large-scale use (such as composite panels, the substrate must be used to ensure that the base plate or coil using the same batch.
③ In many architectural applications, such as: elevator interior, although the fingerprints can be erased, but very beautiful. If you use the cloth surface, it is not so obvious.
Mirror sensitive stainless steel must not be used in these sensitive areas.
④ Select the surface processing should take into account the production process, for example: In order to remove the beads, the weld may be grinding, but also to restore the original surface processing.
⑤ For some surface processing, grinding or polishing lines are directional, is called one-way. If used to make such lines vertical rather than horizontal, dirt is not easy to attach to it and it is easy to clean.
⑥ no matter what kind of finishing are required to increase the process steps, so to increase the cost, so choose the surface processing to be careful.
Therefore, architects, designers and manufacturers and other relevant personnel need to understand the surface of stainless steel processing. Through the friendly cooperation and mutual exchange among each other, we will surely obtain the desired result.
⑦ Based on our experience, we do not recommend the use of alumina as an abrasive unless it is used with great care. It is best to use silicon carbide abrasives.
3. Standard Surface Finishing Many types of surface finishes have been expressed using numbers or other classification methods,
They are included in the relevant standards, such as the British Standard BS1449 and the American Iron and Steel Association Stainless Steel Producer Council standards.
4. Rolled surface processed sheet and strip There are three basic rolling surface treatments that are represented by sheet and belt production processes.
No.1: After hot rolling, annealing, pickling and descaling. The treated steel surface is a dull, slightly rough surface.
No.2D: better than N0.1 surface, but also dark surface. After cold-rolled, annealed, descaling, and finally with Mao Mian roll light rolling.
No.2B: This is the most commonly used in architectural applications. Except for the last mild cold rolling with a polishing roll after annealing and descaling, the other processes are the same as 2D, and the surface is slightly glowing and can be polished.
No.2B Bright Annealing: This is a reflective surface that is rolled by a polishing roll and final annealed in a controlled atmosphere. Bright annealing still retains its reflective surface, and does not produce scale. Since the bright annealing process does not occur oxidation reaction, so no further pickling and passivation treatment.
5. Polished surface processing
No. 3: Represented by 3A and 3B.
3A: The surface is evenly ground with an abrasive particle size of 80-100.
3B: matte finish, the surface has a uniform straight, usually with a particle size of 180 to 200 in the 2A or 2B plate on the disposable polishing.
No.4: Unidirectional surface finish, poor reflectivity, this surface finish may be the most versatile in architectural applications. The process step is to use coarse abrasive polishing, and finally with a particle size of 180 abrasive grinding.
No.6: A further improvement on No. 4, polishing with 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 U.S. standards.
No.7: Known as Bright Polishing, Polishing a surface that has been finely ground but still scratches. 2A or 2B plates are usually used, using a fiber or cloth polishing wheel and the corresponding polishing paste.
No.8: Mirror polished surface, high reflectivity, usually referred to as mirror surface processing, because it reflects the image is very clear. Polishing the stainless steel with a fine abrasive and then grinding with a very fine polishing paste.
It should be noted in architectural applications that such surfaces leave fingerprints for use in areas where there is a large flow of people or where people often touch. Fingerprints can certainly be erased, but sometimes affect the appearance.
The surface finishing described in official standards and literature is a general introduction to the sample to best represent the type of surface finish. Polishing or metal finishing manufacturers will provide a variety of surface processing samples, the user should discuss with them.
6. Surface roughness
The classification of rolled surfaces and polished surfaces is an indication of the degree to which they can be achieved. Another effective representation is the measurement of surface roughness. The standard method of measurement, known as CLA (center line average), is to move the gauge across the surface of the steel plate and record the magnitude of the change in peak-to-valley. The smaller the CLA number, the smoother the surface. The final results for different grades can be seen from the surface processing and CLA numbers in the table below.