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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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Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.