8MnCrB3 Steel

Steel name: 8MnCrB3
Diagram No.: 7274
Type of diagram: CCT
Mat. No. (Wr. Nr.) designation: 1.7135
DIN designation: 8MnCrB3
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: Experimental and calcualted diagrams. The samples were austenitized at 900°C for five 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 720°C and the start temperature of primary ferrite to austenite transformation point Ac3 reaches 880°C. The martensite start temperature Ms is 410°C. It is seen that cooling rates higher than 25°C/s result in fully martensitic microstructure. The lowest cooling rates result in ferritic-pearlitic microstructure. The predicted CCT and TTT diagram of this steel grade was also simulated and presented in Figure. It can be seen that the Ms temperature as well as the critical cooling rates to get fully martensitic microstructures are in good agreement with each other.
Reference: Not shown in this demo version.

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