Overview of Color Processing for Stainless Steel
The manufacturing process of a stainless steel color sheet is not simply coated with a layer of color agents on the stainless steel surface, which can produce rich and vibrant colors, but it is achieved through very complex processes. At present, the method used is the acid bath oxidation coloring, generating the transparent layer of chromium oxide thin films on the stainless steel surface, which will produce different colors due to different film thickness when the light shines above.
The color processing for stainless steel includes shading and the mater treatment in two steps. The shading is carried out in the hot chrome sulfuric acid solution groove when stainless steel is immersed in; it will generate a layer of the oxide film on the surface whose diameter is only one percent thick of the hair.
As time goes by and the thickness increases, the color of the stainless steel surface will constantly change. When the oxide film thickness ranges from 0.2 microns to 0.45 m, the color of the stainless steel surface will show blue, gold, red and green. By controlling the soaking time, you can get the desired color stainless steel coil.
Specification of Colored Stainless Steel Sheet
| Product Name: | Colored Stainless Steel Sheet |
| Grades: | 201, 202, 304, 304L, 316, 316L, 321, 347H, 409, 409L etc. |
| Standard: | ASTM, AISI, SUS, JIS, EN, DIN, BS, GB,etc |
| Certifications: | ISO, SGS, BV, CE or as required |
| Thickness: | 0.1mm-200.0mm |
| Width: | 1000 - 2000mm or Customizable |
| Length: | 2000 - 6000mm or Customizable |
| Surface: | Gold mirror, Sapphire mirror, Rose mirror, black mirror,bronze mirror;Gold brushed, Sapphire brushed, Rose brushed,black brushed etc. |
| Delivery time: | Normally 10-15 days or negotiable |
| Package: | Standard Seaworthy Wooden Pallets/Boxes or as per clients' requirements |
| Payment terms: | T/T, 30% deposit should be paid in advance, the balance is payable at sight of the copy of B/L. |
| Applications: | Architectural decoration, luxury doors, elevators decorating, metal tank shell, ship building, decorated inside the train, as well as outdoor works, advertising nameplate, the ceiling and cabinets, aisle panels, screen, the tunnel project, hotels, guest houses, entertainment place,kitchen equipment, light industrial and others. |
Classification of Colored Stainless Steel
1) Color stainless steel mirror panel
The mirror panel, also known as 8K panel, is polished by polishing equipment on the surface of stainless steel with abrasive liquid to make the surface as bright as a mirror, and then electroplated and colored
2) Colored stainless steel hairline sheet metal
The surface of the drawing board has a matte silk texture. A closer look reveals that there is a trace on it, but I can't feel it. It is more wear-resistant than ordinary bright stainless steel and looks more advanced. There are many kinds of patterns on the drawing board, including hairy silk (HL), snow sand (NO4), lines (random), crosshairs, etc. Upon request, all lines are processed by an oil polishing machine, then electroplated and colored.
3) Color stainless steel sandblasting board
The zirconium beads used in the sandblasting board are processed on the surface of the stainless steel plate by mechanical equipment, so that the surface of the sandblasting board presents a fine bead sand surface, forming a unique decorative effect. Then electroplating and coloring.
4) Color stainless steel combined craft sheet
According to process requirements, multiple processes such as polishing hairline, pvd coating, etching, sandblasting, etc. are combined on the same board, and then electroplated and colored
5) Color stainless steel random pattern panel
From a distance, the pattern of the chaotic pattern disc is composed of a circle of sand grains, and the irregular chaotic pattern nearby is irregularly oscillated and polished by the grinding head, and then electroplated and colored.
6) Color stainless steel etching plate
Etching board is a kind of deep processing after mirror panel, drawing board and sandblasting board are the bottom plate, and various patterns are etched on the surface by chemical method. The etching plate is processed by multiple complicated processes such as mixed pattern, wire drawing, gold inlay, titanium gold, etc., to achieve the effect of alternating light and dark patterns and gorgeous colors.
Chemical Composition of Stainless Steel
| Grade | STS304 | STS 316 | STS430 | STS201 |
| Elong(10%) | Above 40 | 30MIN | Above 22 | 50-60 |
| Hardness | ≤200HV | ≤200HV | Below 200 | HRB100,HV 230 |
| Cr(%) | 18-20 | 16-18 | 16-18 | 16-18 |
| Ni(%) | 8-10 | 10-14 | ≤0.60% | 0.5-1.5 |
| C(%) | ≤0.08 | ≤0.07 | ≤0.12% | ≤0.15 |
