42CrMo4 Steel

Steel name: 42CrMo4
Diagram No.: 6297
Type of diagram: CCT
DIN designation: 42CrMo4
Chemical composition in weight %: 0.38-0.45% C, max. 0.40% Si, 0.60-0.80% Mn, max. 0.025% P, max. 0.035% S, 0.90-1.20% Cr, 0.15-0.30% Mo
Steel group: Alloy steels
Note: CCT diagram for steel DIN 42CrMo4 which corresponds to BS 708A42 (Bofors RO 952). Cooling curves for 95 mm diameter bar are superimposed and represent cooling curves on the transparent overlay sheet in 'Atlas zur Wdrmebehandlung der Stahle'. Figures attached to the lines in the diagram indicate percentage amount of structural constituent. For example: fourth thin line from the left indicates that 2% ferrite has formed when bainite starts and that 75% bainite has formed when martensite starts to develop.
Reference: Not shown in this demo version.

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