12CrMo19-5 Steel

Steel name: 12CrMo19-5
Diagram No.: 5113
Type of diagram: CCT
DIN designation: 12CrMo19-5
Mat. No. (Wr. Nr.) designation: 1.7362
Chemical composition in weight %: max. 0.015% C, 0.30-0.50% Si, 0.30-0.60% Mn, max. 0.035% P, max. 0.035% S, 4.50-5.50% Cr, 0.45-0.65% Mo
Steel group: High-temperature boiler steels
Note: The chromium/molybdenum ratio is considerably higher than that of the latter. The start of the ferrite formation is shifted to lower cooling rates. The pearlite reaction is suppressed in favour of an M2X-(Mo2C) eutectoid. Because of the high chromium/molybdenum ratio, this carbide has a high chromium content and hence a small lattice constant. After the end of the transformation in the ferrite-carbide stage, M23C6 is formed in the slow cooling range. Cementite (M3C) occurs only in the bainite stage or in tempered martensite.
The microstructures are very similar to those arising during transformation of the steel 10CrMo9-10. Reference is therefore made to this section for characteristic micrographs of the precipitated phases.
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 12CrMo19-5. Click the image to enlarge the diagram.

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