There are two series of austenitic stainless steels
300 series stainless steel mainly realizes its austenitic structure by adding nickel. Common 304 stainless steel and 316L stainless steel belong to this series. The 200 series stainless steel replaces manganese and nitrogen instead of nickel, and the nickel content is very small. The common 201 stainless steel and 202 stainless steel belong to this series.
300 series stainless steel is the larger series. The most common and most common type of austenitic stainless steel is Type 304, also known as 18/8 or A2. Items such as 304 stainless steel products, cookware and kitchen equipment. 316 series stainless steel is the next most common austenitic stainless steel. About 300 series, such as type 316, also contain some molybdenum to promote resistance to acids and increase resistance to localized attack (such as pitting and crevice corrosion).
The higher nitrogen addition in the 200 series gives it the higher mechanical strength of the 300 series. Austenitic stainless steels are types 309 and 310 for high temperature applications above 800°C. Characteristics of 200 series stainless steel: While crevice corrosion, the 200 series is less capable than the 300 series to prevent pitting corrosion, which occurs in environments with high moisture and chlorine content, and crevice corrosion, which causes fluid stagnation and High acid environment. This is because, in order to reduce the nickel content, the chromium content must also be reduced, thereby reducing the corrosion resistance.
200 series stainless steels are impact resistant and tough even at low temperatures. They are generally harder and stronger than 300 series steels, mainly because of their higher nitrogen content, which acts as a reinforcing agent. Because they are austenitic, 200 and 300 series steels are inexpensive. However, the formability (ductility) of 200 series steel is lower than that of 300 series steel, although this can be improved by adding copper.
Alloy 20 (Carpenter 20) is an austenitic stainless steel that has excellent resistance to heat sulphuric acid and many other aggressive environments and is prone to attack Type 316 stainless steel. The alloy exhibits excellent resistance to stress corrosion cracking in boiling 20-40% sulfuric acid. Alloy 20 has excellent mechanical properties and the presence of niobium in the alloy minimizes carbide precipitation during welding. According to the different characteristics of different materials, the arrangement and distribution of the arches should also be different, so that a smaller tolerance and a good molding rate can be obtained. Therefore, Hangao Tech (SEKO Machinery) will always communicate with them about various parameters as soon as possible, after receiving inquiries from customers, so as to provide customers with more accurate solutions about stainless steel industrial pipe production line tube mill machinery that meet the actual production needs.
Austenitic stainless steels can be tested by non-destructive testing using dye penetrant inspection methods, or using eddy current testing, but not by magnetic particle inspection methods.
