Developed color stainless steel plate manufacturing technology

Among the commonly used primary color stainless steels, stainless steel is the most suitable material for coloring, and a satisfactory color appearance can be obtained. Ferritic stainless steel is not as bright as austenitic stainless steel due to the increased possibility of corrosion in the coloring solution. The low-chromium high-carbon martensitic stainless steel, due to its poor corrosion resistance, can only get a dark color. or black surface. According to reports, after austenitic stainless steel is colored by low-temperature surface oxidation treatment, it is exposed to industrial atmosphere for 6 years, exposed to marine atmosphere for 1.5 years, bubbled in boiling water for 28 days, or heated to about 300℃. There is no obvious change in its color and luster. In addition, the colored stainless steel plate colored by this method can also withstand the processing procedures such as general molding, drawing and bending. Using pulsed laser and computer-aided design, the manufacturing technology of color stainless steel plate was successfully developed. The method developed by Nippon Steel is to immerse the stainless steel plate in a nitric acid solution, and then irradiate it with a pulsed laser. The length of the irradiation time is controlled, and the surface of the steel plate will show seven colors such as blue, green, and golden yellow. About 1/7 of other coloring processes.

The qualified 17% stainless steel plate and the stainless steel plate containing 18% chromium and 8% nickel were immersed in a 5% nitric acid solution, and then irradiated with a pulsed laser with an energy density of 0.8 joules per square meter. It was found that the stainless steel plate was not affected by the laser. The chromium content of the irradiated part is reduced to 10%; the chromium content of the part irradiated by the laser will increase with the increase of the irradiation time, up to 30%. Under the irradiation of the pulsed laser, the oxide film formed on the surface of the stainless steel plate The color will change with the increase of chromium content. Therefore, different colors of stainless steel can be obtained by controlling the laser irradiation time.

Among the commonly used primary color stainless steels, stainless steel is the most suitable material for coloring, and a satisfactory color appearance can be obtained. Ferritic stainless steel is not as bright as austenitic stainless steel due to the increased possibility of corrosion in the coloring solution. The low-chromium high-carbon martensitic stainless steel, due to its poor corrosion resistance, can only get a dark color. or black surface. It is reported that after the stainless steel is colored by low-temperature surface oxidation treatment and coloring, it is exposed to industrial atmosphere for 6 years, exposed to marine atmosphere for 1.5 years, soaked in boiling water for 28 days, or heated to about 300 ℃, and its color luster There were no significant changes. In addition, the colored stainless steel plate colored by this method can also withstand the processing procedures such as general molding, drawing and bending.

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