Steel name: AISI 321 Stainless Steel
  Diagram No.: 2955
  Type of diagram: TTS
  Chemical composition in weight %: 0.09% C, 1.17% Mn, 0.37% Si, 13.40% Ni, 18.10% Cr,
  0.51% Ti, 0.017% N.
  Note: Precipitation diagram. Time-temperature sensitization and intergranular corrosion.
  Specimens were solution annealed at 1200^oC (2192^oF) for 30 min, water quenched
  and then aged at 600, 700, 800 and 900^oC (1112, 1292, 1472 and 1652^oF) for 1, 4, 16
  and 100 h followed by water quenching Corrosion testing was performed with the boiling
  copper sulphate-sulphuric acid solution (Strauss test) for 72 h. Strip specimens were
  bent 90^o and evaluated for cracks. Legend: 0=no cracks (at 20X), 1=few fine cracks
  (at 20X), 2=many fine cracks (at 20X), 3=few coarse, many fine cracks (at 20X), 4=many
  coarse cracks (at 20X), 5=many coarse cracks (at 10X), 6=cracks visible at 1X. Plot of
  sensitizing data for a type 321 steel (0.09% C-0.50% Ti) orginally water quenched
  from 1200^oC (2192^oF), shown in relationship to the standard Cr₂₃C₆ nucleation and
  stabilization curves for a 0.07%C-18% Cr-8% alloy.
  Source: S.M. Box, F.G. Wilson, "Effect of Carbide Morphology and Composition on the
  Intergranular Corrosion of Titanium-Stabilized Austenitic Stainless Steels", Journal of the
  Iron and Steel Institute, Vol.210, September 1972, p.718.

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