SAE/AISI 4140-4142 Steels

Steel name: SAE/AISI 4140-4142
Diagram No.: 4972
Type of diagram: CCT
Chemical composition in weight %:
AISI 4140: 0.44% C, 0.29% Si, 1.04% Mn, 1.13% Cr, 0.15% Mo
AISI 4142: 0.40% C, 0.25% Si, 1.00% Mn, 1.00% Cr, 0.20% Mo
Steel group: Structural steels
Note: A CCT diagram for 1.25Cr-0.20 Mo steel (SAE/AISI 4140-4142) that was austenitized at 860 °C (1580 °F). The vertical lines in the upper diagram give the cooling rate for the center of bars with different diameters when quenching in different media. The lower part of the figure shows the hardness after hardening and tempering (T) at various temperatures.
Reference: Not shown in this demo version.

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