0.05C-17Cr-13Ni-5Mo-0.039N Steel

Steel name: 0.05C-17Cr-13Ni-5Mo-0.039N
Diagram No.: 5182
Type of diagram: TTT
Chemical composition in weight %: 0.05% C, 17% Cr, 13% Ni, 5% Mo, 0.039% N
Steel group: Austenitic stainless steels
Note: 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 (Figure). The time for chi formation in the 5% Mo alloy is even shorter than that for chromium carbide formation.
As briefly noted earlier, nitrogen delays the formation of these phases, and is employed for this purpose in many HPASS. This effect is demonstrated in Figure 2. In this figure, the 5% Mo alloy of Figure 1 is modified with 0.145% N. The nitrogen addition pushes back the onset of both chi and chromium carbide formation to ten minutes, compared to two to four minutes for the alloy containing only 0.039% N. The 0.145% N alloy allows for slower cooling after annealing or welding without the formation of secondary phases.
Reference: Not shown in this demo version.

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