Inspection Standards Of Stainless Steel Plate

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Inspection Standards Of Stainless Steel Plate

Post  landoo on Tue Jan 29, 2013 6:27 pm

The rolling surface machining and polishing surface machining classification is described able to achieve the degree of another effective method is to measure the surface roughness. Standard measurement method is referred to as CLA (center line average), the lateral movement of the measuring instrument at the surface of the stainless steel plate, and recording the amplitude of the next peak and valley changes. CLA number is smaller, the smoother the surface. Surface machining and CLA number from the following table can be seen the final result of the different grades. Surface machining CLA, microns 2B 0.1-0.5 2A 0.05-0.1 2D 0.4-1.0 3 0.4-1.5 4 0.2-1.5 8 0.2 EP basic value of 1/2 EP = electrolytic polishing, can be broadly will decrease in amplitude of the peak and valley changes to the original surface of 1/2.
We should remember that the abrasive grinding operation with sandpaper or sanding belt is essentially a polished cutting operation, leaving a very thin lines in the steel surface. We alumina as abrasive had encountered trouble, in part because of the problem of pressure. Any abrasive member of the device, such as: the belt and the grinding wheel, etc., before use, must not be used for other non-stainless material. Because it will contaminate the stainless steel sheet. In order to ensure the consistency of surface finish, the new grinding wheel or abrasive belt should first trial on the same component of the waste, so that the same products were compared.
The electrolytic polishing is a metal removal process, stainless steel as the anode in the electrolyte in this process, metal is removed from the surface energized. This process generally used for the components of the processing, because of their shape is difficult to be polished by conventional methods. The process is commonly used on the surface of the cold-rolled steel sheet, because its surface smoothness than the surface of the hot rolled steel sheet. However, the electrolytic polishing makes the surface of the impurities is more obvious, especially titanium and niobium-stable material differences between the weld zone due to the granular impurities. Small burr and sharp edges can be removed through the process.This process focuses on the treating surface projecting portion, first dissolving them. Electrolytic polishing process is the stainless steel is immersed in the heated liquid, the ratio of the liquid relates to the many proprietary and patented technologies. Electrolytic polishing of austenitic stainless steel with good results.
The pattern of the patent include wove the Ed House) (for London, mosaics, pearl-like, and leather grain. You can also use the corrugated and linear pattern. Tread surfaces are particularly suitable for interior decoration, such as: elevator paneling, counters, siding and at the entrance. Should take into account the external application through the rain and the artificial scouring cleaning surface, avoiding easy to gather dirt and dead air impurities stainless steel to prevent corrosion caused by the impact of aesthetics.
For internal applications, such as: inside the elevator, the mixed surface processing is very popular. This mixing process is a matt surface formed by spray glass ball, then processed through the disguise, covered with plastic film, a polished surface processing, and finally to the formation of mixed surface polishing and no Ze.Stainless steel grit pills can also be used in a process similar. Glass balls or pellets prior to use must not be used on other materials, especially not in the stainless steel sheet. Carbon steel powder will be embedded into the surface of stainless steel, it is easy to cause corrosion. Ceramic balls can also be used as a spray material.
Stainless steel reason why not rust affective chromium oxide film because of its surface. The color process is the use of this layer is formed of the specified color. Stainless steel to take advantage of this layer, there is always the film, so neither fade nor need regular maintenance like paint. Colored stainless steel molding processing, even in the sharp bend nor will color any adverse effects. Corrosion resistance, tests showed that the process has been enhanced corrosion resistance. This process is closely related to the operating time, the time of different colors will change. The order in which the change in color is brown, gold, red, purple and green. A major feature of the process is its final appearance reflects the original surface of the material, namely: mirror polished surface will produce a strong metallic luster, the rough surface of the color of the surface finish is dull.
The process is preferably stainless steel immersed in the solution tank, the solution containing 250 grams per liter of Cr2O3, containing 490 grams per liter sulfuric acid can also, the temperature range of 80 to 85 ° C, soaking time depends on the desired color, and up tothan 25 minutes. The steel sheet is rinsed with a clean cold, then at ambient conditions into a concentration of 250 g / 1 liter perchlorate and 2.5 g / 1 liter of phosphoric acid liquid cathodic treatment time was about 10 minutes, and the current density is 0 .2 ~ 0.4 A/dm2. In order to prevent damage, color processing performed immediately after the hardening process, and then be rinsed in hot water and dried.

landoo

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