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Avesta 654 SMO Steel
Steel name: Avesta 654 SMO
Diagram No.: 7364
Type of diagram: TTT
Chemical composition in weight %: 0.016% C, 0.26% Si, 3.65% Mn, 0.017% P, <0.001% S, 24.40% Cr, 7.26% Mo, 21.90% Ni, 0.503% N
Steel group: Austenitic stainless steels
Note: Calculated diagram. The calculated composition of equilibrium phases for all
steels agree reasonably well with experimentally found
ones. However, in the AVESTA 254 SMO and 654 SMO
steels no Sigma phase was found after annealing at 700 °C for
500 h; a Laves phase was found instead and the Sigma phase
subsequently appears only very slowly. The experimentally
determined content of Cr, Mo, and Ni in the Sigma phase is also
systematically lower than that calculated for both AVESTA
steels. Minor amounts of other phases, mainly the Pi phase,
is present in all steels after 6170 h of annealing. The presence of residual Laves phase in the AVESTA alloys after 6170 h at 700 C also indicates that
equilibrium has still not been achieved after this period. Thermodynamic calculations show that
once a metastable Laves phase has precipitated, there is only a very small driving force to
convert it to the equilibrium Signa phase.
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.