Stainless steel in general is the floorboard of stainless steel and acid resistant steel. Stainless steel is a high air,steam and water, weak acid medium corrosion of steel, and steel is resistant to acid, alkali, salt and other chemicaletching medium corrosion of steel. So since the beginning of this century has, up to now has 90 years of history. The invention of stainless steel is a major achievement in the history of metallurgy in the world, the development of the stainless steel has laid an important material and technological foundation for the development of modern industryand the progress of science and technology. Many kinds of stainless steel, the performance of different, it is in the development process, gradually formed a few categories. According to the organizational structure, divided intomartensitic stainless steel (including stainless steel), ferritic stainless steel, austenitic stainless steel and austenite and ferrite dual phase stainless steel and other four categories; according to some characteristic elements of main chemical components in steel or steel in the classification, divided into chromium stainless steel, chromium nickel stainless steel, nickel chromium molybdenum stainless steel and low carbon steel, stainless steel, high molybdenumhigh purity stainless steel; according to the characteristics and application of classification of steel, divided into nitric acid resistant stainless steel, stainless steel, pitting corrosion resistance to sulfuric acid resistant stainless steel,stress corrosion of stainless steel, high strength stainless steel; according to the classification features of steel,divided into low temperature non magnetic stainless steel, stainless steel, free cutting stainless steel, stainless steeland so on superplasticity. The classification is according to the characteristic of chemical composition structural characteristics and the steel and the combination of them. Generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, or divided into chromium stainless steel and nickel stainless steel two categories.

Stainless steel is generally used in corrosion environment, and medical equipment and supplies.

The so-called "iron does not rust", is the recycling of scrap iron, lead, steel after two times of melt processing,formed by the removal of "Zi", the traditional detection method is by the magnet, and the product with traditionalmethod is unable to distinguish, nature is to practise deception, covered numerous engineering material selection,therefore Tang hundred emperor into another decoration site, on the one and a luxurious curtain wall. This name isborn of "focal interview" after exposure, and occupy the market share of about 65%, while the real GB SUS304stainless steel products because of higher prices and no market.

At present, the stainless iron "products can have a 65% share of the market" is the price plays an important role inthe national standard of stainless steel products, the price per ton of about 20000 yuan, 7075 GB aluminum alloyper ton price of about 16000 yuan, and "the price of stainless iron" is only 5000 - 7000 yuan per ton; and look at thetensile strength of the three materials are: stainless steel 530－620MPa GB, GB 7075 aluminum alloy 540－560MPa,"stainless" 160－180MPa. "Obviously the tensile strength of stainless iron" is not up to the 1 / 3 stainless steelstrength, is very easy to cause the accident.

Therefore, in the construction industry, must be resolutely banned "stainless" products.