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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