Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. is a professional supplier of stainless steel seamless pipes, including the production of ferritic stainless steel seamless pipe and tube and austenitic stainless steel seamless tube. Now let me introduce the stainless steel performance of ferritic stainless steel seamless pipe and tube. If you are interested, please continue reading:
Ferritic stainless steel (400 series) contains 15% to 30% chromium and has a body-centered cubic crystal structure. This type of steel generally does not contain nickel, and sometimes also contains a small amount of Mo, Ti, Nb and other elements. This type of steel has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. It is mostly used for making atmospheric resistance. , Water vapor, water and oxidizing acid corroded parts. The price of ferritic stainless steel is not only relatively low and stable, but also has many unique characteristics and advantages. It has been proved that in many application fields where only austenitic stainless steel (300 series) can be used, ferritic stainless steel is an extremely An excellent alternative material, ferritic stainless steel does not contain nickel. The main elements are chromium (>10%) and iron. Chromium is a particularly corrosion-resistant element for stainless steel, and its price is relatively stable. The application of out-of-furnace refining technology (AOD or VOD) can greatly reduce interstitial elements such as carbon and nitrogen, which makes this type of steel widely used.
Its corrosiveness is as follows:
(1) Uniform corrosion. Chromium is the easiest element to passivate. In the atmosphere, iron-chromium alloys with a chromium content of more than 12% can be self-passivated. In the oxidizing medium, the chromium content can be passivated when the content is more than 17%. In some highly corrosive medium, high chromium and adding molybdenum, nickel, copper and other elements can obtain good corrosion resistance.
(2) Intergranular corrosion. Ferritic stainless steel and austenitic stainless steel will have intergranular corrosion, but sensitization treatment and heat treatment to avoid this corrosion are just the opposite. Ferritic stainless steel is prone to intergranular corrosion from rapid cooling above 925°C, and the state (sensitized state) that is prone to intergranular corrosion can be eliminated after a short period of tempering at 650-815°C. The intergranular corrosion of ferritic steel is also the result of chromium depletion caused by carbide precipitation. Therefore, reducing the carbon and nitrogen content in the steel and adding elements such as titanium and niobium can reduce the susceptibility to intergranular corrosion.
(3) Resistance to stress corrosion cracking. Due to the characteristics of the structure, ferritic stainless steel is corrosion-resistant in the medium where austenitic stainless steel produces stress corrosion cracking.
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