Fake stainless steel easy identification methods

People tend to think that "stainless steel" is "stainless steel", if it is rusty, it must be fake and shoddy products. Of course, this understanding is too simple. First of all stainless steel "stainless" is not absolutely not rusty, but relatively not rust under certain conditions. If the user improper use of its corrosion resistance beyond its use in the environment or conditions, will naturally rust. Second, rust corrosion of stainless steel used in the product may also be due to unreasonable selection of manufacturers, manufacturers use their products for the inappropriate use of stainless steel grades as raw materials, it may be the manufacturer's production and processing technology, however, but off. In addition, that is the manufacturer did use the market does not meet the relevant authority of the state or industry standard stainless steel raw materials. In any case, these are the manufacturers should face and solve procurement and processing. In view of the current situation in the market that still exists in the production and sale of inferior stainless steel, as well as shoddy and counterfeit certificates of quality such as market deception, how can we grasp the purchase of stainless steel material to take the initiative to quickly identify these frauds, to avoid Shock stainless steel by the harm it? For these may equally bright stainless steel, from the appearance of distinction between true and false, even if as an expert is also difficult to do, then there is no easy way? Someone said: This is very simple, suck it with a magnet! Unable to absorb is good, is "stainless steel", sucked that is poor, is "stainless steel"! At present, this approach seems to be very popular. There are even scientific publications and television programs that have implemented this method. It is unscientific and extremely wrong for such statements and practices to be denied by industry experts. Among the five major types of stainless steel that have been developed and applied in the world, only austenitic stainless steel (many 300 series grades and 200 series grades) are often non-magnetic (after processing or weakly magnetic) and ferritic stainless steel (many 400 series grades) , Duplex stainless steel, martensitic stainless steel, precipitation hardened stainless steel with magnetic. Whether stainless steel or not, each stainless steel has its own characteristics and application range. 300 series austenitic stainless steel is the most widely used, and with modern magnetic ferrite and other types of stainless steel is also increasing the use of proportion, in the kitchenware products, household appliances, decoration, automotive exhaust systems, petrochemical and other civil, The industrial sector can partially replace 300 series austenitic stainless steel. For 200 series of such magnets "can not hold" the austenitic stainless steel, manganese, nickel-nitrogen, the corresponding 300 series of steel to reduce the cost and improve the strength, but because of its corrosion resistance, making it the field of application Narrow, often those areas that require high strength, non-magnetic and corrosion resistance is not high, such as springs, electronic equipment. For the so-called "200 series stainless steel" currently prevailing in the Chinese market, its corrosion resistance and use value is even lower. Instead of producing according to the existing national standards, these products reduce their nickel and chromium content in steel according to their less stringent corporate standards and increase their manganese content, some of which even drop to less than 1% nickel and reduce chromium to Below 10%, manganese increased to more than 14%, its pitting equivalent is very low, far below the corresponding national standards. In terms of corrosion resistance, these products can not even be called stainless steel, it can not be called 200-series stainless steel. In the current stainless steel market in China, it can be said that there is almost no real 200 series stainless steel. The so-called "200 series stainless steel" on the market is now the biggest problem steel and inferior steel, but it is just like the 300 series austenitic stainless steel Is a non-magnetic austenitic steel! It can be said that in the current Chinese market to identify the advantages and disadvantages of using stainless steel suction, often condone the inferior stainless steel, while the exclusion of high-quality magnetic ferrite and other steel species, but also because of cost factors excluded non-magnetic 300 Department of austenitic stainless steel, and even may make such counterfeit steel is faked into non-magnetic 300 series austenitic stainless steel and used in industry.

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