Now many industrial manufacturing products will use stainless steel wire rope material for production, in order to identify fake stainless steel, certain measures and methods can be taken.However, many customers do not know what method can be used to identify. The following types of identification methods are listed by Gepair tensile mesh.
1, Magnetic test method
Magnetic test method is the most original and most common distinction between austenitic stainless steel and ferritic stainless steel is the simplest method, austenitic stainless steel is not magnetic steel, but after large pressure cold processing will have mild magnetic;And pure chromium steel and low alloy steel are strong magnetic steel.
2. Nitric acid point test
A distinguishing feature of stainless steel wire rope is its inherent corrosion resistance to concentrated and dilute nitric acid, which makes it easily distinguishable from most other metals or alloys.However, high carbon 420 and 440 steels are slightly corroded in nitric acid point test, and non-ferrous metals are corroded immediately in concentrated nitric acid, while dilute nitric acid has a strong corrosive effect on carbon steel.
3, Copper sulfate point test
Copper sulfate point try to be quick to distinguish between ordinary carbon steel and the easiest way of all types of stainless steel wire rope, the use of the concentration of a solution of copper sulfate is 5% – 10%, before point tests, test area should be thoroughly remove oil and other impurities, cloth or soft grinding polishing and grinding machine small area, and then try the droplets to burnish, ordinary carbon steel or iron will form within a few secondsA layer of surface metal copper, and the surface of the point test stainless steel does not produce copper precipitation or show copper color.
4, Sulfuric acid test method
Sulfuric acid immersion of stainless steel can distinguish 302 and 304 from 316 and 317.The cutting edge of the sample should be finely ground, and then cleaned and passivated in sulfuric acid with a volume concentration of 20%~30% and a temperature of 60~66℃ for half an hour. When the volume concentration of sulfuric acid solution is 10% and heated to 71℃,302 and 304 are immersed in the solution, the steel is rapidly corroded and produces a large number of bubbles, and the sample becomes black in a few minutes.While 316 and 317 steel samples are not corroded or corroded very slowly (no bubbles), the test within 10~15 minutes do not change color.The test can be more accurate if the sample with known composition is used for approximate comparison.
Post time: Mar-08-2022
