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Filter can be said to have a very important application in our lives, so we understand how the stainless steel filter material should be detected? An Ping Warner small series below for you to introduce in detail: the first is the magnetic difference: There are some such as 400 series and 300 series of identification can be through magnetic identification, 400 series is generally magnetic, 300 series generally no magnetic. Identification with magnet: Magnet can basically distinguish between two types of stainless steel. Because chromium stainless steel in any state can be magnetic attraction; chromium-nickel stainless steel in the annealing state is generally non-magnetic, in cold processing, some will have magnetic. However, high manganese steel with high manganese content is non-magnetic; chromium-nickel-nitrogen stainless steel magnetic situation is more complex: Some non-magnetic, some magnetic, some Longitudinal non-magnetic and magnetic transverse. Therefore, although the magnet can basically distinguish between chromium stainless steel and chromium-nickel stainless steel, but can not correctly distinguish some special properties of steel, but also can not distinguish the specific steel.
The second is the use of instruments: direct-reading spectrometers, which can detect all elements, and can detect element c; and X-ray fluorescence spectrometers, which are fast and easy to carry, and can accurately detect the composition and brand. The third most convenient way: if the factory does not have this kind of equipment can also try other ways. For example: The simplest and most intuitive way is to use stainless steel material identification of water, also known as stainless steel potion. Chemical qualitative method is a method to identify whether magnetic stainless steel contains nickel or not. The method comprises dissolving small pieces of stainless steel in Aqua Regia, diluting the acid solution with purified water, adding ammonia to neutralize it, and gently injecting nickel reagent. If there is a red fluffy substance floating on the liquid surface, it indicates that the stainless steel contains nickel; if there is no red fluffy substance, that is, to prove that there is no nickel in stainless steel (but because of the low nickel content in stainless steel, generally only a few percent, nickel content is not easy to reveal or determine how much, generally need to use standard samples after many experiments to master) .
The fourth color difference: After pickling stainless steel, the surface color of silver-white smooth: chrome-nickel stainless steel silver-white jade color; chrome-stainless steel white slightly gray luster weak; chrome-manganese-nitrogen stainless steel color and chrome-nickel stainless steel similar slightly Pale. The color of unpickled stainless steel is brownish-white, brownish-black, and black (these three colors refer to the color of heavy oxidation) . Cold-rolled unannealed chromium-nickel stainless steel with a silvery reflective surface. Stainless steel is generally white after acid pickling except yuan steel. The fifth with Copper Sulfate Identification: The method is to remove the oxide layer on the steel, put a drop of water, with copper sulfate rub, rub, such as do not change color, generally stainless steel; such as purple red: non-magnetic High Manganese Steel, generally magnetic steel or low alloy steel. There are many ways of stainless steel material identification, you can use the appropriate way according to their own conditions to identify, hope through the above introduction can help you.