As for how to distinguish the advantages and disadvantages of stainless steel raw materials, if you personally distinguish the stainless steel in detail which material is indistinguishable, it must be chemically analyzed. Some of the differences between the 400 series and the 300 series can be distinguished by magnetics. The 400 series is generally magnetic, and the 300 is generally not magnetic.

1. The difference in color:
Through the acid-washed stainless steel, the appearance of the color is white and bright: the chrome-nickel stainless steel is white and jade-colored; the chrome-stainless steel is slightly grayish and the gloss is weak; the color of the chrome-manganese-nitrogen stainless steel is slightly lighter than the chrome-nickel stainless steel. The appearance of stainless steel without pickling: chrome-nickel steel is brownish white; chrome steel is brownish black; chrome-manganese nitrogen is black, (these three colors refer to the heavier oxidized color). Cold-rolled, unannealed chrome-nickel stainless steel with a reflective white appearance. In addition to Yuan Steel, stainless steel is generally pickled and white.

2. Identify with copper sulfate:
The method is to remove the oxide layer on the steel, put a drop of water, rub it with copper sulfate, if it does not change color after rubbing, it is generally stainless steel; if it turns purple red: non-magnetic is high manganese steel, magnetic is generally Steel or low alloy steel.

3. Identify with a magnet:
Magnets can fundamentally differ between two types of stainless steel. Since chrome stainless steel can be attracted by magnets under any condition; chrome-nickel stainless steel is generally non-magnetic in the annealed state, and some may be magnetic after cold working. However, the high-manganese steel with higher manganese content is non-magnetic; the magnetic condition of chrome-nickel-nitrogen stainless steel is more disordered: some are non-magnetic, some are magnetic, some are non-magnetic in the longitudinal plane and magnetic in the transverse plane. Therefore, although the magnet can fundamentally differ between chromium stainless steel and chrome-nickel stainless steel, it cannot correctly distinguish some special-purpose steel grades, and it is not possible to distinguish the detailed steel grade.
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