What are the categories of stainless steel pipes with acid and alkali resistance?
Austenitic stainless steel is the stainless steel with austenite structure at normal temperature. When the steel containing Cr is about 18%, Ni, 8%~25% and C is about 0.1%, it has a stable austenite structure. Austenitic chromium nickel stainless steel includes the famous 18Cr-8Ni steel, and on this basis, increasing the content of Cr, Ni, and adding Mo, Cu, Si, Nb, Ti and other elements developed by the high Cr-Ni series steel. Non magnetic austenitic stainless steel with high toughness and plasticity, but the intensity is low, not through the phase change to strengthen, can only be strengthened by cold working, such as adding S, Ca, Se, Te and other elements, it has good machinability. Good comprehensive performance, corrosion resistant variety of media.To prevent intergranular corrosion, this kind of stainless steel is usually low carbon or ultra low carbon.
Stainless steel is usually classified according to the organization of the matrix, as follows:The ferritic stainless steel (200 and 400) the chromium content in 15%~30%, with a body centered cubic crystal structure. This kind of steel does not contain nickel, sometimes also contain a small amount of Mo, Ti, Nb and other elements, this kind of steel has high heat conductivity, low expansion coefficient, good oxidation resistance and anti stress excellent characteristics of stress corrosion, used formanufacturingthecorrosionresistanceofthe atmosphere, water vapor, waterandoxidizing parts. Ferritic stainless steel prices are relatively low and stable, and has many unique characteristics and advantages, it has been proved that in many of the original that can only use austenitic stainless steel (300) application of ferritic stainless steel is a very excellent substitute materials, ferritic stainless steel containing nickel, the main elements of Cr (>10%) and iron, chromium stainless steel special corrosion resistant elements, its price is relatively stable.. Chromium 12% ~ 30%. Its corrosion resistance and toughness increase with the increase of chromium content, and the weldability is excellent.
According to corrosion resistance, stainless steel has different alloy composition, commonly used there are ten kinds. According to the composition, roughly classified as chromium and chromium nickel, low carbon and ultra low carbon series.
Stainless steel is mainly used for acid resistance, alkali resistance is not necessarily very prominent.
