27MnCrB5 Steel

Steel name: 27MnCrB5
Diagram No.: 7275
Type of diagram: CCT
Mat. No. (Wr. Nr.) designation: 1.7182
DIN designation: 27MnCrB5
Chemical composition in weight %: 0.25% C, 0.21% Si, 1.24% Mn, 0.34% Cr, 0.01% Ni, 0.03% Al, 0.042% Ti, 0.002% B, 0.004% N
Steel group: Boron steels
Note: For this steel grade the austenization temperature was fixed at 880°C and the samples were heated for eight minutes. For a heating speed of 200 K/min, the eutectoid reaction temperature Ac1 is 730°C and the start temperature of primary ferrite to austenite transformation point Ac3 reaches 820°C. The martensite start temperature Ms is 400°C. It is seen that with cooling rates higher than 20°C/s, the fully martensitic microstructure is achieved. The lowest cooling rates result in ferritic – pearlitic microstructure which is in good agreement with as-received results. Figure illustrates the CCT diagram of investigate steel.
Reference: Not shown in this demo version.

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