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AISI 316 Steel
Steel name: AISI 316
Diagram No.: 7288
Type of diagram: TTT
Mat. No. (Wr. Nr.) designation: ~1.4401
DIN designation: X5CrNiMo17-12-2
AISI/SAE designation: AISI 316
Chemical composition in weight %: max. 0.08% C, max. 1.00% Si, max. 2.00% Mn, max. 0.045% P, max. 0.030% S, 16.00-18.00% Cr, 2.00-3.00% Mo, 10.00-14.00% Ni
Steel group: Austenitic stainless steels
Note: TTT diagram for Type 316 stainless steel. Secondary phases chi, sigma and Laves
take a long time to develop in this standard grade stainless steel.
With HPASS, precipitation of sigma and chi phases is
of greater concern than chromium carbide, because
the high chromium and molybdenum content in the
alloys promotes rapid formation of these phases. All
HPASS have low carbon content, which minimizes the
rate of chromium carbide formation and reduces
concern for chromium carbide sensitization. A TTT
diagram for Type 316 stainless containing 2% Mo and
a fairly high carbon content (Figure), shows that
chromium carbide can form in as little as five
minutes, but chi and sigma phases only form after
80 hours or so. In contrast, an alloy having similar
chromium and nickel content, but containing 5% Mo,
suffers chi formation in very short times.
The time for chi formation in the 5% Mo alloy is even
shorter than that for chromium carbide formation.
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.