17CrMoV10 Steel

Steel name: 17CrMoV10
Diagram No.: 5116
Type of diagram: CCT
DIN designation: 17CrMoV10
Mat. No. (Wr. Nr.) designation: 1.7766
Chemical composition in weight %: 0.15-0.20% C, 0.15-0.35% Si, 0.30-0.50% Mn, max. 0.035% P, max. 0.035% Si, 2.70-3.00% Cr, 0.20-0.30% Mo, 0.10-0.20% V
Steel group: Stainless steels
Note: The steel 17CrMoV10, which is resistant to high-pressure hydrogen, is used mainly for high-pressure synthesis plants in the chemical industry. For this reason, the steel should be heat-treated in such a way that it is free of cementite. At the relatively high carbon content of this steel, the additions of chromium, molybdenum and vanadium are not sufficient to suppress the formation of pearlite during the cooling from the austenitizing temperature. In addition to cementite, the carbonitride MX and the chromium carbides M23C6 and M7C3, may be present, depending upon the heat treatment.
Starting from austenite with non-dissolved MX (VN), first MX and for slower cooling and at lower temperatures M23C6 are precipitated in the pre-eutectoid ferrite during continuous cooling. The latter precipitates first in globular form on the grain boundaries and later as rods within the grains. The transformation in the ferrite-carbide range is concluded with the formation of pearlite. An MX special carbide eutectoid, often observed in other vanadium-alloyed steels, does not occur in this steel on account of the fact that the vanadium content is too low. In the transformation-free region between the ferrite-carbide and the bainite reactions no further carbide reactions occur.
Reference: Not shown in this demo version.

Transformation Diagram

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Time-temperature-transformation and phase diagram with phase volume fractions and hardness for continuous cooling of the steel 17CrMoV10. Click the image to enlarge the diagram.

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