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316 Nb Steel
Steel name: 316 Nb
Diagram No.: 8180
Type of diagram: TTP
AISI/SAE designation: ~316
Chemical composition in weight %: <0.10% C, <0.50% Si, <2.00% Mn, 16.50-19.50% Cr, 2.25-2.75% Mo, 11.00-14.50% Ni, 8xC-1.00% Nb, <0.05% N
Steel group: Austenitic stainless steels
Note: TTT curves of initial and final precipitation stages of sigma phase in delta-ferrite of 316 Nb steel. The TTT diagram of s phase precipitation in
316 Nb steel is presented in figure. It is found that the precipitation occurs between 700 and
1000°C when the treatment time does not exceed 120 minutes. For each annealing temperature, the
transformation begins in the d-ferrite islands. At 1000°C, the transformation begins after 120
minutes of annealing and it stops before all the d-ferrite is transformed. Between 750 and 950°C,
d-ferrite islands are totally transformed in less than 120 minutes. The precipitation rate is
particularly high between 800 and 900°C where the transformation begins after about 1 minute of
annealing and ends after 10 to 12 minutes. A longer isothermal hold of 93 hours at 875°C shows
that the sigma phase appears also in austenitic matrix after the d-ferrite islands are totally transformed.
Reference: Not shown in this demo version.
Xavier Ledoux, et al., KINETICS OF SIGMA PHASE PRECIPITATION IN NIOBIUM-STABILIZED
AUSTENITIC STAINLESS STEEL AND EFFECT ON THE MECHANICAL
PROPERTIES, Materials Science Forum Vols. 783-786 (2014) pp 848-853, doi:10.4028/www.scientific.net/MSF.783-786.848
Transformation Diagram
Click the image to enlarge the diagram.
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.