Domestic stainless steel tableware can be divided into 430, 18-8, 18-10 three grades. 430 stainless steel, which is composed of more than +12% chromium, can prevent natural factors caused by oxidation, called stainless steel, but after a long period of use will still rust. 18-8, its composition is Iron +18% chromium +8% NI, 18-10 its composition is Iron +18% chromium +10% NI. Chromium is to make the product does not rust material, and nickel is corrosion-resistant materials, the higher the nickel content, the better the quality of products, the price is more expensive. Strictly speaking, only chromium and nickel-free products are stainless iron, both iron and nickel-containing products is the steel. Choose stainless Steel products to see the code is very important, if the product does not have a printing code, is generally free of nickel products. Because nickel is an anti magnetic material, so in the purchase, usually can use a magnet to try, can be attracted by magnets is not rust iron products, not to be attracted by magnets is stainless steel products. On the market there have been two kinds of label "201" of stainless steel products, its composition is completely not in line with the relevant standards of stainless steel, but openly playing stainless steel signs appear in the market. From the surface, the product and ordinary stainless steel is difficult to distinguish, and non-magnetic, very easy to cause confusion among consumers, it is stainless steel in the "Li Ghost", the simplest way to judge is that its price is cheap. The real high-quality stainless steel must be a penny of the goods, expensive reasons. The use of chemical methods to identify the authenticity of stainless steel, 100mL distilled water, add 8g anhydrous copper sulfate, add 3 drops of concentrated sulfuric acid, this solution drops on the surface of stainless steel products to stay for 6 minutes, the real stainless steel products surface will not change, unqualified products surface can produce a layer of red material.
In addition to purchase stainless steel products should also pay attention to the following two aspects: A look color, black black color, is likely to be stainless iron, color hair deep red, it is likely to use manganese instead of nickel. Two hand touch, edge can not have burrs, smooth surface, no scratches, no sand hole.