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When Buying Stainless Steel How To Distinguish Between True And False
May 17, 2017

In view of the current market is the production and sale of poor quality stainless steel, and shoddy, fake quality certificate market fraud, we in the procurement of stainless steel material how to seize the initiative and quickly spot the fraud, shoddy stainless steel from harm? For these may be the same beautiful stainless steel, to distinguish the true merits from the appearance, even as experts are also difficult to do that, what if there is any easy way?

Five kinds of stainless steel in the world has developed applications, only the color of stainless steel plate (300 series, 200 series of numerous brands often have no magnetic (grades) after processing or weak magnetic), and ferritic stainless steel (many 400 series brand), duplex stainless steel, martensitic stainless steel and precipitation hardening stainless steel with magnetic. Whether or not magnetic, each stainless steel has its characteristics and scope of application.

300 series austenitic stainless steel is widely used in modern iron and magnetic element using the ratio of other types of stainless steel are increasingly high, can partially replace 300 series austenitic stainless steel in the kitchen products, household electric appliances, decoration, automobile exhaust system, petrochemical and other civil and industrial fields.

The 200 magnets suck live in the generation of austenitic stainless steel, nickel with manganese and nitrogen, lower cost than the 300 series steel corresponding, to increase the strength, but because of its corrosion resistance decreased, so the application field is relatively narrow, are those that require high strength, corrosion resistance and non magnetism requirements high field, such as springs, electronic equipment etc..

In the Chinese market, the so-called "200 series stainless steel", its corrosion resistance and use value is even lower. These products are not produced in accordance with the existing national standards, but it is not strictly in accordance with the enterprise standard reduced nickel and chromium content in steel, increase the content of manganese, nickel and some of them even dropped below 1%, chromium is less than 10%, manganese increased to more than 14%, the amount is very low when pitting that is far less than the corresponding national standards.

From corrosion resistance, these products can not even be called stainless steel, nor can it be called "200 series stainless steel". In the present Chinese color stainless steel plate market, it can be said that almost no real 200 series stainless steel market, the so-called "200 series stainless steel is the largest steel and shoddy steel, but it and the 300 series austenitic stainless steel, it is non magnetic austenitic steel!

It can be said that in the current market Chinese using magnet to identify the advantages and disadvantages of stainless steel often indulge, shoddy stainless steel, and crowding out high quality magnetic ferrite steel, also because of cost factors out of the magnetic 300 series austenitic stainless steel, may even make this kind of fake fake steel into 300 Austenitic stainless steel no magnetic and used in industry.

It is obviously not possible to identify stainless steel by using magnets. Is there any other practical and convenient method? The answer is yes. This is a simple method, namely the use of stainless steel was measured by liquid identification, some is measured by observing the color change characteristics of liquid steel in the process of measuring the dissolved in the determination or distinguish measured by steel. "Color change" is often associated with specific elements such as nickel (Ni), molybdenum (Mo) and manganese (Mn) in the tested steel.

Anyway, we in the procurement of stainless steel products, in addition to pay attention to product delivery inspection certificate or certificate of quality, should pay attention to the credibility of the business, but not freeloaders, we see through the market in fraud and shoddy stainless steel products really, still can take the initiative to take some action.