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How to identify stainless steel wire rope

[author: Date:2015-7-24 15:51:31]

Now a lot of industrial manufacturing products, will use the stainless steel wire rope material production, in order to identify the quality of stainless steel material, can take certain measures and methods. But many customers do not know how to use any method can be identified, the following is a list of the following identification methods.

1, magnetic test method

Magnetic testing method is the most primitive of the most common distinction of austenitic stainless steel and iron element of the stainless steel body the simplest method, austenitic stainless steel is non-magnetic steel, but the high pressure after cold working with mild magnetic; and pure chromium steels and low alloy steels is strong magnetic steel.

2, nitrate test method

One of the notable features of the stainless steel wire rope is that it has an inherent corrosion resistance of the concentrated nitric acid and dilute nitric acid, which can be easily distinguished from most other metals or alloys.

But the high carbon type 420 and 440 steel in the nitric acid test is slightly affected by corrosion, non-ferrous metals encountered strong nitric acid is immediately corroded, and dilute nitric acid on carbon steel has a strong corrosive.

3, copper sulfate point method

Copper sulfate test is fast to distinguish between ordinary carbon steel and all type of stainless steel wire rope of the most convenient methods, the use of copper sulfate solution concentration is 5% - 10%, in the point before the test, the test area should be completely remove oily or other impurities, and sanding or polishing cloth polishing a small area, and then the solution droplets to grinding place, ordinary carbon steel or iron in a few seconds will form a layer on the surface of copper, and try a stainless steel surface does not produce copper precipitation or copper color.

4, sulfuric acid test method

Sulfuric acid immersion stainless steel can distinguish between 302 and 316 and 304 and 317. Samples of the cutting edge to after fine grinding, then in volume concentration is 20% ~ 30%, temperature is 60 DEG C sulfuric acid cleaning and passivation for half an hour, the volume concentration of sulfuric acid solution was 10%, heated to 71 degrees, 302 and 304 immersed in the solution in steel is rapid corrosion and a large number of bubbles, specimen in a few minutes black; and 316 and 317 steel specimens is not subject to corrosion or corrosion is very slow (bubble) test in 10 to 15 minutes discoloration. The test can be more accurate if the sample with a known composition is used to approximate the comparison.

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