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These elements are grouped as austenite-forming, ferrite-forming, carbide-forming and nitride-forming elements. Austenite-forming elements The elements C, Ni and Mn are the most important ones in this group. Sufficiently large amounts of Ni or Mn render a steel austenitic even at room temperature.
In austenitic welding materials a determined amount of delta-ferrite is aimed to reduce the tendency of hot cracky. A material without delta-ferrite is bad for hot forming at increased temperatures. Nitrogen in the steel suppresses the formation of delta-ferrite.lpha-and delta-iron are both cubic body centered. In the microstructure of austenitic chromium-nickel and chromium-nickel-molybdenum-steels is occasionally a little amount of ferrite determineable.