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Identification of the merits of stainless steel, 304 stainless steel material identification

Source: Time:2015-04-08 09:40:22 frequency:

200 series stainless steel and 300 series stainless steel surface, even if it is difficult to distinguish the experts, many users can not buy water tanks to identify the authenticity of stainless steel, it will bring you incalculable losses and risks. Here to teach you how to identify stainless steel
200 series stainless steel and 300 series stainless steel surface, even if it is difficult to distinguish the experts, many users can not buy water tanks to identify the authenticity of stainless steel, it will bring you incalculable losses and risks. Here to teach you how to identify the stainless steel
304 stainless steel tanks Physical identification:
Stainless steel plate physical identification, is to at unknown steels (number) of the case, according to the goods (including the entire material, more than expected, kind of waste, etc.) inherent physical and chemical properties, with a simple apparatus, with senses to determine if it is What kind of specific methods and attributes of stainless steel instead of stainless steel.
It should be pointed out: sensory identification, can not distinguish (species) Number concrete steel, basically only difference chrome stainless steel, chrome-nickel stainless steel and chrome-manganese nitrogen stainless steel three categories, its identification methods are as follows:
1. The color difference:
After pickling of stainless steel, surface color silver Baiguang Jie: chrome-nickel stainless steel color silver Bai Chengyu color; chrome stainless steel color white slightly gray sheen weak; CrMnN stainless steel and chrome-nickel stainless steel similar color is paler. Without pickling stainless steel surface color: chrome-nickel steel brownish white; chrome steel brownish black; CrMnN black, (these three color refers to the color of oxidized heavier). Chrome-nickel stainless steel cold rolling without annealing, silver reflective surface. Except yuan stainless steel, usually pickled white.
2. Use copper sulfate Identification:
The method is to remove the oxide layer on the steel, put a drop of water, rub with copper sulfate, after wiping such as discoloration, usually stainless steel; such as purple variant: non-magnetic high manganese steel, magnetic generally ordinary steel or low alloy steel.
3. Use the magnet to identify:
The basic difference between the two types of stainless steel magnet can. Because chromium stainless steel can be attracted in any state magnet; chrome-nickel stainless steel in the annealed condition is generally non-magnetic, in the cold, and some will be magnetic. But high manganese high manganese steel is non-magnetic; magnetic chrome-nickel stainless steel nitrogen situation is more complicated: Some non-magnetic, some magnetic and some non-magnetic and horizontal longitudinal surface magnetic surface. So, to say, although magnets can basically distinguish chromium stainless steel and chrome-nickel stainless steel, but can not correctly distinguish between some of the special properties of steel, but can not distinguish specific steel.
For the steel special properties, we need to take the following three approaches were identified.
1) Frosted identification:
Identification is to wear flowers on stainless steel grinder mill, watch his spark. A spark was streamlined, and there are many more dense flower festival, is a high-manganese steel or high manganese steel manganese nitrogen; if no flower festival is chrome steel or chrome-nickel stainless steel.
2) Identification of annealing method:
Chrome-nickel stainless steel cold hand, if magnetic, desirable piece of red-hot in the fire or into the water let the natural cooling (annealing), in general, after the magnetic annealing is significantly reduced or completely disappear. But some chrome-nickel stainless steel, such as steel and Cr21Ni5Ti Cr18Ni11Si4AlTi steel, Invar contains more ferrite elements, a considerable part of its internal organization is ferrite. Accordingly, even in a state of thermal processing are also magnetic.
3) Identification of Chemical characterization:
Chemical qualitative method is to identify whether there is a magnetic stainless steel containing nickel discriminating approach, the method is: the small stainless steel deep in aqua regia solution, dilute with water to acid, ammonia is added and after, and then gently Nickel reagent injection. As the liquid level floating red velvet-like substance, which indicates that stainless steel containing nickel; if not red velvet-like substance, namely proof stainless steel without nickel. (However, due to low nickel content stainless steel, usually only a few percent, the nickel content is not easy to reveal or to determine how much, are generally required to use a standard sample after the experiment many times to master.)
Several more discriminating approach Description: Identification of stainless steel tube with a sense, not only are several ways to use integrated test, and the test results can only determine some type of stainless steel, not sure what kinds of alloying elements contained in the steel and concrete content. So, to say, sensory identification method, it is now very imperfect, and some may be wrong, there are many physical phenomena, also only know but I do not know why, to be further explored.
The best way to correct stainless steel distinction, in-depth investigation into the relevant processing units, to their material master administrator and ask workers to understand the situation of steel materials and carefully inspect the steel on steel stamp, consult the original information, etc., which is the fundamental method of stainless steel grades and quality distinguish correctly. For the content of alloying elements and have greater access, requiring them to be piled separately, in order to facilitate the rational use and avoid unnecessary losses and waste.
Stainless steel has a lot of material, but commonly used materials are
304 / 304j / 304L / 316 / 316L / 321 / 310S
410/420 / 420J1 / 420J2 / 430 /
201/202
On how to identify the advantages and disadvantages of stainless steel, if the individual identification of stainless steel specifically what kind of material is not identified, must the job through chemical analysis. There are some, such as the 400 series and 300 series identification can be magnetic identification, 400 series are generally magnetic, 300 are generally not magnetic.
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