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How To Identify The Quality Of Alloy Stainless Steel Wire Mesh?

Oct. 30, 2018

How to identify the quality of Alloy Stainless Steel Wire Mesh? Some people would say that it is unscientific to distinguish Stainless Steel Wire Mesh with a magnet. So what is the way to identify the quality of Stainless Steel Wire Mesh? Below, I will introduce to you:

Nitric acid point experiment. A notable feature of stainless steel tubing is its inherent corrosion resistance to concentrated nitric acid and dilute nitric acid. This property makes it easy to distinguish from most other metals or alloys. However, the high carbon type 420 and 440 steels are slightly corroded when subjected to the nitric acid point test, and the non-ferrous metals are immediately corroded when they encounter concentrated nitric acid. Dilute nitric acid is highly corrosive to carbon steel. Sulfuric acid immersion stainless steel wire mesh experiment. This experiment was used to distinguish between 302 and 304 with 316 and 317. The cut edge of the sample is finely ground and then immersed in nitric acid having a volume concentration of 20-30% and a temperature of 60-66 degrees for half an hour. The volume concentration of the sulfuric acid test solvent is 10% and heated to 71 degrees. When 302 and 304 have just entered this solution, they are rapidly corroded and produce samples with known compositions for approximate comparisons, which makes the experiment more accurate.

Copper sulfate point test. The copper sulfate point test is the easiest way to quickly distinguish between normal carbon steel and all types of stainless steel. The concentration of the copper sulfate solution used is 5 to 10%. Before the point test, the test area should be thoroughly cleaned of grease or various impurities, and a small area is polished with a soft cloth, and then the copper sulfate solution is dripped into the cleaned area with a drop bottle. Ordinary carbon steel or iron forms a layer of surface metallic copper in a few seconds, while stainless steel surfaces do not produce copper deposits or show copper color.

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