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8MnCrB3 Steel
Steel name: 8MnCrB3
Diagram No.: 7273
Type of diagram: CCT
Chemical composition in weight %: 0.07% C, 0.21% Si, 0.75% Mn, 0.37% Cr, 0.01% Ni, 0.05% Al, 0.048% Ti, 0.002% B, 0.006% N
Steel group: Boron steels
Note: The samples were austenitized at 970°C for eight
minutes. The circled numbers indicate the values of hardness in HV10 scale.
For a heating speed of 200 K/min, the eutectoid reaction temperature Ac1 is
735°C and the start temperature of primary ferrite to austenite transformation
point Ac3 reaches 910°C. The martensite start temperature Ms is 530°C. It is
seen that cooling rates higher than 17 °C/s results in bainite + martensite
microstructure. It can be concluded that even at very high cooling rates; fully
martensitic microstructure can not be achieved.
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.