Steel with about 8% Cr and 2% Mo

Steel name: Steel with about 8% Cr and 2% Mo
Diagram No.: 5127
Type of diagram: CCT
Chemical composition in weight %: 0.19% C, 0.34% Si, 0.46% Mn, 0.019% P, 0.013% S, 7.87% Cr, 2.02% Mo
Steel group: Special alloy steels
Note: This material, which is not so far included in the standards, is distinguished by a relatively high molybdenum content amongst the high-temperature steels. Its transformation and precipitation behaviour is shown in Fig. As in the case of other steels with a high chromium content, M23C6 precipitates on the austenite grain boundaries. At the same time the formation of bainite is suppressed. Two different borders of coarse M23C6 and fine M2X precipitates are formed on slow coolingafter completion of the ferrite formation, on account of the high molybdenum content. Within the ferrite, round M23C6 particles and needles of M2X appear in higher density. A self-tempering effect of the martensite, which cannot be avoided even by rapid cooling, results in the precipitation of M3C in the form of needles.
Reference: Not shown in this demo version.

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Time-temperature-transformation and phase diagram with phase volume fractions and hardness for continuous cooling of the steel with approx. 8% Cr and 2% Mo. Click the image to enlarge the diagram.

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