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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