SAE 4142 Steel

Steel name: SAE 4142 Steel
Diagram No.: 2759
Type of diagram: TTT & CCT
SAE designation: 4142
Chemical composition in weight %: 0.40% C, 0.31% Si, 0.70% Mn, 0.010% P, 0.026% S, 1.11% Cr, 0.16% Mo, 0.16% Ni, 0.15% Cu
Steel group: Alloy steels
Note: Influence of heating rate during austenization. A.) TTT heating diagram, heating rate = 1020oC (1870oF)/s. B.) TTT cooling diagram, experimental data (solid lines): Heating rate = 130oC (265oF)/s, austenitized at 950oC (1740oF) for 6 s, cooling rate = 130oC (265oF)/s, conventional data (dashed lines), austenitized at 860oC (1580oF) for 10 min.
Note: Hardness numbersa are (left column) for the rapid heating diagram, and (right column) for the conventional diagram. C.) CCT heating diagram.
Reference: Not shown in this demo version.

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