200 series stainless steel identification method
① Spectrum
Using a high-voltage electric excitation spectrometer (the instrument is small in size and easy to carry) can qualitatively distinguish the types of elements in the tapped steel and the approximate level of the content.
②Chemical reagents
There is a special reagent called nickel qualitative liquid, which is dropped on the surface of stainless steel and oxidized instantly after electrification, resulting in light white or light yellow, indicating that the stainless steel does not contain nickel;
It produces light rose red and immediately fades into dark yellow, indicating that the stainless steel contains about 1%-2% nickel;
It produces rose red and does not fade, indicating that the stainless steel contains more than 4% nickel, and the brighter the rose red, the higher the nickel content.
③Color
The surface color of the pickled stainless steel: 300 series stainless steel is silvery white and jade color; 400 series stainless steel is white and slightly gray, and the luster is weak; The surface color of stainless steel without pickling: 300 series stainless steel is brownish white; 400 series stainless steel is brownish black; 200 series stainless steel is black.
④Spark
Spark identification is to grind stainless steel on a grinder and watch the sparks. If the spark is streamlined and has more dense knots, it is 200 series stainless steel with higher manganese content; if there is no knot, it is 300 or 400 series stainless steel.
The above methods are simple and easy identification methods, but there are also certain errors, especially the third and fourth methods are completely judged by visual experience, and the error may be larger. The most accurate method is, of course, the inspection report issued by a qualified inspection agency.
Recommended:
Advantages and disadvantages of 200 series stainless steel
Stainless steel 200 Series: Cr Mn Ni
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