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18 8 stainless steel definition12/9/2023 ![]() This grade has almost the same formability, corrosion resistance and weldability as grade 4301, but with higher strength. The chemical composition of grade Core 201/4372 is around 17 % Cr, 4 % Niand 7 % Mn. Following the AISI/ASTM nomenclature, their nickel content is decreased and the austenitic microstructure is maintained by replacing some of the nickel with manganese and nitrogen. In the Cr-Mn grades are also referred to as “200-series” grades. Contrary to earlier practice where titanium and niobium stabilisation was also used to avoid detrimental carbide precipitates on welding, for modern low-carbon Cr-Ni steels this is not necessary. There are also stabilized grades where titanium or niobium is added to increase the mechanical properties at high temperatures by the formation of hardening carbides. In order to improve the strength and machinability, some of the grades are alloyed with either nitrogen or sulphur. These grades are sometimes referred to as 18-8 type of stainless steels, indicating the approximate chromium and nickel content respectively. The Cr-Ni grades are general purpose grades, which are mainly alloyed with chromium and nickel, with the exclusion of molybdenum. Read more about the five subclasses: Cr-Ni grades Cold working increases their strength and certain grades are therefore supplied in the temper rolled condition, which may lead to them becoming magnetic due to the presence of some martensite. ![]() Due to their austenitic microstructure, the grades are non-magnetic in the solution annealed condition. Their impact strength at low temperatures is often exploited in cryogenic applications. The austenitic grades have good to excellent corrosion resistance, good formability and weldability. They have good fabricability, resistance to atmospheric corrosion and resistance to many organic and inorganic compounds.Ĭr-Mn grades, Cr-Ni grades, Cr-Ni-Mo grades, high performance austenitic grades and high temperature austenitic grades. As with all of our stainless steels, we produce our austenitic steel grades to the strictest quality standards and performance requirements.
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