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July 10, 2020
How does 316 stainless steel distinguish between true and false?
The simple distinction of 316 stainless steel is also the most basic and convenient. It is the difference between using magnetite, and the other is the drop test with medicine. To judge more professionally, it is necessary to make a spectrum, so it is very important to identify the manufacturer in the purchase of stainless steel materials. and each batch of goods has a factory quality certificate.
For now, the international corrosion resistance of materials is divided into three categories according to the annual corrosion rate:
The first category is complete corrosion resistance, the corrosion rate is less than 0.1mm/year, high-quality stainless steel belongs to this type of material;
The second type is corrosion resistance, and its corrosion rate is 0.1-1.0mm/year, which belongs to general stainless steel;
The third category is non-corrosion resistance, whose corrosion rate is greater than 1.0mm per year.
A recent random inspection found that some stainless steel products have been analyzed and the corrosion rate is as high as 9.67mm/year, which is severely not resistant to corrosion. Upon further analysis of the composition of the product, it was found that the chromium content, which represents an important indicator of stainless steel, is only 10.03% and 7.1%, which is lower than the requirement of 10.5% for the minimum demand of stainless steel for chromium.
The common people's lack of knowledge about stainless steel was used to falsify. It is generally believed that stainless steel is not magnetic, and counterfeiters have used a large amount of manganese instead of nickel to change the composition of the product to obtain a material that is neither magnetic nor extremely low in cost to achieve high profits.
Generally speaking, the chromium content of stainless steel is greater than 10.5%, and the chromium content of these two products is far below this lower limit, the product is not stainless steel at all. The reason why this product will appear on the market is mainly because the producers are interested. The appearance of such products is difficult to distinguish from the usual stainless steel in the market. At the same time, because of the lack of magnetism, some illegal dealers take the trick of mixing and selling. It is very difficult for consumers to distinguish between authenticity and unpredictable consequences.