AISI 321 Stainless Steel

Steel name: AISI 321 Stainless Steel
Diagram No.: 2955
Type of diagram: TTS
Chemical composition in weight %: 0.09% C, 0.37% Si, 1.17% Mn, 18.10% Cr, 13.40% Ni, 0.51% Ti, 0.017% N
Steel group: Stainless steels
Note: Time-temperature sensitization and intergranular corrosion. Specimens were solution annealed at 1200oC (2192oF) for 30 min, water quenched and then aged at 600, 700, 800 and 900oC (1112, 1292, 1472 and 1652oF) 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 90o 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 1200oC (2192oF), shown in relationship to the standard Cr23C6 nucleation and stabilization curves for a 0.07%C-18% Cr-8% alloy.
Reference: Not shown in this demo version.

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