How to identify the stainless steel wire rope (b) but high carbon steel type 420 and 440 points during nitric acid test is slightly affected by corrosion, non-ferrous metals encountered immediately concentrated nitric acid corrosion, and dilute nitric acid having a strong corrosive to carbon steel. The easiest way to spot copper sulfate copper sulfate test point test method is quick to distinguish between ordinary carbon steel and all types of stainless steel wire rope, the concentration of copper sulfate solution used is 5% to 10%, before making spot test, test District should completely remove oily or other impurities, and with sanding or polishing cloth Polishing a small area, and then drops again to polish at 304 all soft lines, plain carbon steel or iron will in a few seconds forming a layer of the surface of copper, and stainless steel point test surface copper precipitation or not the display color of copper production. Sulfuric acid immersion test method 302 and 304 stainless steel can 316 and 317 separate. Trimming the sample to be finely ground, then the volume concentration of 20% to 30%, temperature 60 ~ 66 ℃ sulfuric acid cleaning and passivation of half an hour, the volume concentration of 10% sulfuric acid solution was heated to 71 ℃ when immersed in the solution 302 and 304, 304 stainless steel cord lowest price, steel is rapidly corrode and produce a lot of bubbles, 304 stainless steel cord, black sample within a few minutes; and 316 and 317 steel samples is not subject to corrosion or corrosion is very slow (no bubbles), test in 10 to 15 minutes does not change color. If the sample tested simultaneously with a known composition to approximate comparison, 304 stainless steel cord market, can test more accurate. Stainless steel wire in production processes in magnetism it! People often think of stainless steel wire rod magnets verify its quality and authenticity, do not smoke no magnetic, considered a good, worthy of the name; suction is magnetic, it is considered counterfeit, fake. In fact, this is an extremely one-sided, fault distinguishing way. Reality stainless steel wire will "rust", will also take magnetic stainless steel wire is more than 60% of the iron matrix, participate networks, nickel, molybdenum and other alloying elements of high-alloy steel, its greatest feature is resistant to strong, but not definitely not rust stainless steel wire. In coastal areas or some serious local air pollution, while large chlorine ion content in the air, exposure to the atmosphere of stainless steel wire appearance can have some rust, but rust confined to the outer, not erode stainless steel wire inside the matrix . Many varieties of stainless steel wire, most with a magnetic, therefore, is not to identify with the magnet adsorption scientific way stainless steel lines. Variety of complex stainless steel wire, according to lay out at room temperature can be divided into the following categories: 1 austenitic: If 304,321,316,310, etc; 2 martensite or ferrite: If 430, 420, 410, etc; 304 stainless steel cord specifications _304 stainless steel cord _ Shengyuan Stainless provided by the Dongguan City Shengyuan stainless steel. Dongguan Shengyuan Stainless Steel Co. (dg-shengyuan.cn) strong, credible, in Dongguan, Guangdong metal packaging machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shengyuan into the brilliant stainless steel and you work for a better future!