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M398 Steel
Steel name: M398
Diagram No.: 9658
Type of diagram: CCT
Chemical composition in weight %: 2.72% C, 0.51% Si, 0.50% Mn, 20.07% Cr, 1.00% Mo, 7.22% V, 0.70% W
Steel group: PM tool steels
Note: Comparison of CCT diagrams of powder tool steel M398. Figure presents a comparison of two CCT diagrams. The diagram shown with
solid lines represents the actual measured CCT diagram of M398 steel made based on the
evaluation of cooling curves from dilatometric measurements. The dashed line shows
the diagram, which is made based on simulated cooling curves from the JMatProŽ API
v7.0 simulation software. Both diagrams are inserted into one figure for a simplified
comparison of measured and simulated results. Cooling rates were determined during
physical measurement and simulation in the range of rates from 100 C/s to the slowest
0.01 C/s. A total of eight dilation curves were evaluated for each pair of diagrams.
Both produced CCT diagrams clearly demonstrate the presence of martensitic, bainitic,
and pearlitic phases, while the simulated proportion of individual phases for selected
cooling rates can be seen in Figure. Temperatures Ac1 and Ac3 were determined as
an average value from all dilatometric measurements. The temperatures Ac1 and Ac3,
marked with dashed lines, were provided automatically by the calculation software when
the cooling simulation was performed. These values of the austenitization temperature were unchanged from the cooling rate. In the case of actual experiments, the temperatures
of Ac1 and Ac3 vary slightly depending on the heating rate. This issue is dealt with in more
detail [70]. From the diagram, we can determine the measured temperatures of Ac1 = 960 C
and Ac3 = 1070 C. The simulated values of austenitization temperatures are Ac1 = 962 C
and Ac3 = 1016 C.
Reference: Not shown in this demo version.
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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.