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DSS 2205 Steel
Steel name: DSS 2205
Diagram No.: 5014
Type of diagram: CCT and TTT
ASTM designation: A 182
SAE designation: J405
UNS designation: UNS S31803
Chemical composition in weight %: max. 0.030% C, max. 1.00% Si, max. 2.00% Mn, max. 0.030% P, max. 0.020% S, 22.0-23.0% Cr, 3.00-3.50% Mo, 4.50-6.50% Ni
Steel group: Duplex stainless steels
Note: Time-temperature transformation (TTT) and continuous-cooling transformation
(CCT) curves of duplex stainless steel (DSS) 2205 showing transformation of 1, 3, 5 and
10% sigma-phase. The cooling rates are 0.23, 0.11, 0.07 and 0.04 °C/s.
Time-temperature transformation (TTT) diagrams obtained from isothermal heat treatment followed
by quenching, can be used to investigate the susceptibility of DSSs to the sigma-phase formation. This
diagram indicates the time for a phase to decompose into other phases isothermally at different
temperatures. In contrast, continuous-cooling transformation (CCT) diagram displays the time for a
phase to decompose into other phases continuously at different rates of cooling. Figure shows typical
TTT and CCT curves for DSS 2205 with different sigma-phase contents. Isothermal heat treatment at
865 °C for 134 s precipitates 1% sigm-phase. This implies that the aging time at 865 °C should not exceed
134 s. The 1% sigma content can be obtained at room temperature after continuous cooling with 0.23 °C/s
at 940 °C and above. To avoid the formation of more than 1% sigma, the cooling rate from the solution
annealing temperature must exceed 0.23 °C/s.
Reference: Not shown in this demo version.
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Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.