|Austenitic stainless steel Material Properties
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Austenitic stainless steels have a austenitic, face centered cubic (fcc) crystal structure.
Steels containing high percentages of certain alloying elements such as manganese and nickel which
are austenitic at room temperature and cannot be hardened by normal heat-treatment but do work harden.
They are also non-magnetic. Typical examples of austenitic steels include the 18/8 stainless steels and 14% manganese steel.
Nohara Formula is used to calculate the temperature Md30 at which an amount of 50 % austenite will be
transformed to martensite through cold-deformation of 0.30 true strain. Nohara Formula can be given as:
Md30=551 - 462 * %C - 9.2 * %Si - 8.1 * %Mn
- 13.7 * %Cr - 29 * %Ni - 18.5 * %Mo - 29 * %Cu - 68 * %Nb - 462 * %N - 1.42 * (GS[ASTM] -8.0)
The standard value assigned to austenitic stainless steel to denote a specific
ferrite content; used instead of percent ferrite. The formula for Avesta Ferrite Number FNA assumes parallel lines of constant ferrite numbers.
FNA Cr-equivalence includes Ti as an additional element. FNA Ni-equivalence contains Cu and Co as additional elements. formulas for FNA can be given as:
Creq = Cr + 1.5 Si + Mo + 2 Ti + 0.5 Nb
Nieq = Ni + 30 (C + N) + 0.5 Mn + 0.5 Cu + 0.5 Co
FNA = 3.34 Creq - 2.46 Nieq - 28.6