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X20CrMoV12-1 Steel
Steel name: X20CrMoV12-1
Diagram No.: 5123
Type of diagram: CCT
DIN designation: X20CrMoV12-1
Mat. No. (Wr. Nr.) designation: 1.4922
Chemical composition in weight %: 0.17-0.23% C, max. 0.50% Si, max. 1.00% Mn, max. 0.030% P, max. 0.030% S, 10.00-12.50% Cr, 0.80-1.20% Mo, 0.30-0.80% Ni, 0.25-0.35% V
Steel group: Stainless steels
Note: The high-temperature strength of this material is achieved by the addition of the carbide-forming elements molybdenum and vanadium, which also determine the precipitation sequence. The materials with 12 % Cr and additions of molybdenum, vanadium and nickel fill the gap between the low-alloy ferritic steels and the high-temperature austenitic steels. As in the case of all high-chromium steels, there is no bainite transformation, and M23C6 is precipitated already, often in dendritic form, on the austenite grain boundaries, before the start of the transformation. In the vanadium-alloyed steels, traces of MX may also form in the austenite (Fig.Pre-eutectoid ferrite does not occur, since the steel is hyper-eutectoid on account of the high chromium content.
The transformation begins at low cooling rates with the formation of M2X borders. Through carbon depletion of the remaining austenite, ferrite is formed, but only after completion of the transformation and at low cooling rates. In alloys with low molybdenum content or during isothermal transformation, borders of M23C6 are formed in addition to those of M2X.
The steel is always used with a microstructure of tempered martensite. Under normal operating conditions mainly M23C6 is present. On slow heating, M3C, M2X and M23C6 are formed in that order with increasing temperature. Increased carbon and nitrogen contents generally accelerate the transformation.
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 X20CrMoV12-1. Click the image to enlarge the diagram.
Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.