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In the practical application of color stainless steel pipe, the steel with weak corrosion resistance is often called stainless steel

Article source: Foshan Quanyu Stainless Steel Co., Ltd Editor in charge: Ample stainless steel
Release time: December 28, 2018 24 hours hotline: 134-5082-8388 Views:
All metals react with oxygen in the atmosphere to form an oxide film on the surface. Color stainless steel tube Unfortunately, the iron oxide formed on the common carbon steel continues to oxidize, causing the corrosion to expand and eventually form holes. The appearance of carbon steel can be ensured by electroplating with paint or oxidation resistant metals (e.g., zinc, nickel and chromium), but, as is known, this protection is only a thin film. If the protective layer is damaged, the steel below will begin to rust, which can resist the corrosion of weak corrosive medium such as air, steam, water and chemical etching medium such as acid, alkali and salt.

Also known as stainless acid resistant steel. In practical use, the steel with weak corrosion resistance is called stainless steel, and the steel resistant to chemical medium corrosion is called acid resistant steel. Due to the difference in chemical composition, the former is not necessarily resistant to chemical medium corrosion, while the latter is generally rust free. Color stainless steel tube The corrosion resistance depends on the alloy elements contained in the steel. Chromium is the basic element for stainless steel to obtain corrosion resistance. When the content of chromium in steel reaches 1.2%, the effect of chromium and oxygen in corrosive medium forms a thin oxide film (self passivation film) on the surface of steel, which can prevent further corrosion of steel substrate. In addition to chromium, the common alloy elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc. to meet the requirements of various applications for the structure and function of stainless steel.
Stainless steel is usually divided into: 1. Ferritic stainless steel. The chromium content is 12% - 30%. Its corrosion resistance, resistance and weldability are improved with the increase of chromium content, and its chloride stress corrosion resistance is better than other kinds of stainless steel. 2. Austenite Color stainless steel tube It contains more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive function and can resist corrosion of various media. 3. Austenitic ferrite duplex stainless steel. It has the advantages of both austenitic and ferritic stainless steel and superplasticity. 4. Martensitic stainless steel. High strength, but poor plasticity and weldability. 5. Precipitation hardening stainless steel. It has good forming function and good weldability, and can be used as ultra-high strength data in nuclear industry, aviation and aerospace industry. It can be divided into CR system (sus400), Cr Ni system (sus300), Cr Mn Ni (sus200) and precipitation hardening system (sus600).


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