Austenitic stainless steels are distinguished from other highly alloyed steels and ferritic steels by their crystal structure:the austenitic alloys have an FCC crystal structure compared with Ferrite Content in Austenitic Stainless Steels - NeoNickelFerrite Content in Austenitic Stainless Steels The basic 300 series stainless materials like 304L and 316L have an austenitic microstructure and are non-magnetic. In the annealed condition they are essentially free of ferrite, which is magnetic. Cast products of these alloys typically have some ferrite present.
Generally, ferritic stainless steels are characterized by their high chromium and low carbon content. Many austenitic stainless steel grades can be substituted by ferritic counterparts if they show similar properties. They are less expensive due to their lower levels of chromium and low levels of nickel. Ferritic/Martensitic Steel - an overview ScienceDirect F/M steels exhibit much lower swelling than austenites. Resistance to swelling is due to the bcc crystalline structure. The bcc structure, additionally, displays higher strength; however, it is less ductile than its fcc counterpart (the austenite). Magnetic Behavior of Stainless Steels, Austenitic (Non Examples of austenitic stainless steels are Type 302, 303, 304, 316 and 316L. Ferritic Stainless Steels. Ferritic stainless steels are ferromagnetic and have been used as soft magnetic components such as solenoid cores, pole pieces and return paths. Although their magnetic properties are not generally as good as conventional soft magnetic
The ferritic stainless steels are somewhat stronger than austenitic stainless steels, the yield stresses being in the range 300-400 MPa, but they work harden less so the tensile strengths are similar, being between 500 and 600 MPa.