Household stainless steel tableware can be divided into 430,18-8,18-10 three grades. 430 stainless steel, the composition of iron + 12% or more of chromium, can prevent the oxidation caused by natural factors, known as stainless steel, but after prolonged use will rust. 18-8, which consists of iron + 18% chromium + 8% nickel, and 18-10 having the composition Fe + 18% Cr + 10% Ni. Chromium is the product does not rust the material, and nickel is corrosion-resistant materials, the higher the amount of nickel, the better the quality of products, the more expensive prices. Strictly speaking, only chromium and nickel-free products are stainless iron, both iron and nickel-containing products is stainless steel. Select stainless steel products to see the code is very important, if the product does not print the code, is generally non-nickel products. Since nickel is a diamagnetic substance, so when you buy, you can usually try with a magnet, can be attracted to the magnet is a stainless steel products, not attracted by the magnet is stainless steel products. There have been two kinds of labels on the market "201" stainless steel products, its composition does not meet the relevant standards of stainless steel, but openly under the name of stainless steel brand in the market. On the surface, the product is difficult to distinguish between ordinary stainless steel, and non-magnetic, easily lead to confusion of consumers, it is stainless steel in the "Li Gui", the simplest way to judge is its cheap. The real high-quality stainless steel must be a sub-price goods, and expensive reasons. Chemical method can identify the authenticity of stainless steel, in 100mL distilled water, add 8g anhydrous copper sulfate, then add 3 drops of concentrated sulfuric acid, the solution drops on the surface of stainless steel products stay 6 minutes, the real stainless steel surface will not change, Unqualified product surface will produce a layer of red material.
Also buy stainless steel products should also pay attention to the following two aspects: a look at the color, the color black hair Ukraine, is likely to be stainless iron; color hair deep red, manganese is likely to replace the nickel. Second hand touch, the edge can not be burr, smooth surface, no scratches, no trachoma.