People tend to think that "stainless steel" is not rusted steel rust, so it must be regarded as a fake and shoddy product. This understanding is of course too simplistic. The first stainless steel plate "stainless steel" will never rust, but relatively rust under certain conditions. If used improperly, it will naturally rust when used in situations or conditions beyond its corrosion. When the product is corroded by stainless steel, it may be because the manufacturer chooses unreasonably, that is, the manufacturer chooses an inappropriate grade of stainless steel for its product, or it may be the factory's production and processing technology, but it is related. In addition, it is the market authority of the manufacturer's real choice that does not meet the relevant national or industry standards and inferior stainless steel raw materials. At present, there are still market frauds in the market that produce and sell low-grade stainless steel, as well as fake and shoddy and fake quality certificates. These could be equally bright stainless steel, the pros and cons of visually distinguishing the real from the fake, even if it's unlikely as an expert they would do, so what's easy?

Someone said: It's very simple, use magnets to verify! This claim, this method seems to be popular, even scientific journals, TV shows are implemented by this method. For this statement, practice, industry experts have given a negative unscientific, extremely wrong. Five major classes of stainless steel 300 series grades are developed and applied in the world, 200 series grades are usually non-magnetic (machined or weakly magnetic) and ferritic stainless steels (many 400 series grades), duplex stainless steels, horse body stainless steels, and precipitation hardened stainless steels with magnetic properties. Whether magnetic or not, each stainless steel has its own characteristics and scope of application. 300 series austenitic stainless steel is the most widely used, while the use of modern ferritic magnetic stainless steel tableware and kitchenware products, household appliances, home appliances, decoration, automotive An increasing proportion of exhaust systems, petrochemicals and other civil industrial sectors can partially replace 300 series austenitic stainless steels. Magnets such as 200 "attract austenitic stainless steel, manganese, and nitrogen to form nickel, cost less than the 300 series, increase strength, but have narrower applications due to their reduced corrosion resistance, often requiring high strength, non-magnetic and resistant Areas with low corrosion requirements, such as springs, electronic equipment. For the so-called "200 series stainless steel, which is currently ubiquitous in the Chinese market, corrosion resistance and use value are low. These products are not produced in accordance with current national standards, but in accordance with very strict corporate standards to reduce nickel, chromium content in steel, manganese content, some of which are even below 1% nickel, chromium drops below 10%, manganese increases to 14% % or more, very low pitting equivalent, much lower than the corresponding national standards. From the point of view of corrosion resistance, these products cannot even be called stainless steel, nor can they be called 200 series stainless steel. In the Chinese stainless steel market, it can be said that there is almost no real 200 series stainless steel on the market, the so-called "200 series stainless steel is the biggest problem of steel, inferior steel and 300 austenitic stainless steel, but it is not there yet, it is precisely a non-magnetic austenitic steel! It can be said that magnets are good for identifying stainless steel, tend to condone inferior stainless steel, while extruding high-quality magnetic ferritic steel, extruding non-magnetic, also because of the current cost factor in the Chinese market 300 austenitic stainless steel may even be This fake non-magnetic 300 series austenitic stainless steel for industrial use is made.

The advantages and disadvantages of magnets to identify the authenticity of stainless steel are obviously not enough. Is there no simple method for other practical purposes? The answer is yes. This describes a simple method of using stainless steel to determine fluid identification, by observing the measurement liquid as it dissolves the measurement liquid to produce a color change signature to identify or distinguish certain conditions of the measurement steel. "Color change" is usually related to specific elements measured in steels such as Nickel (Ni), Molybdenum (Mo), Manganese (Mn).