42CrMo4 Steel

Steel name: 42CrMo4
Diagram No.: 8246
Type of diagram: CCT
Mat. No. (Wr. Nr.) designation: 1.7225
DIN designation: 42CrMo4
AISI/SAE designation: 4135/4140
Chemical composition in weight %: 0.38% C, 0.23% Si, 0.64% Mn, 0.019% P, 0.013% S, 0.99% Cr, 0.17% Cu, 0.16% Mo, 0.08% Ni, <0.01% V
Steel group: Alloy special structural steels
Note: Steel 42CrMo4, austenitised 850C / 10 min (from F. Wever et al.): As the cooling time decreases, the near-equilibrium ferritic / pearlitic microstructure transforms into a non-equilibrium bainitic and martensitic microstructure. The enormous increase in the concentration of lattice defects hardens the material. Ms and Mf refer to the start and finish temperatures, respectively, for martensite formation. A stands for austenite, and F, P, B, M for the regions of ferrite, pearlite, bainite, and martensite formation. The percentages of microstructural constituents are marked along the cooling curves. The diagram is also known as a continuous cooling transformation (CCT) diagram.
Reference: Not shown in this demo version.

Transformation Diagram

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