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AISI 4140 Steel
Steel name: AISI 4140
Diagram No.: 8335
Type of diagram: CCT
Mat. No. (Wr. Nr.) designation: 1.7225
DIN designation: 42CrMo4
AISI/SAE designation: AISI 4140
Chemical composition in weight %: 0.38% C, 0.23% Si, 0.64% Mn, 0.16% Mo, 0.08% Ni, <0.01% V, 0.17% Cu
Steel group: Structural steels
Note: Austenitizing temperature: 850 C. CCT diagram of AISI 4140 steel with
superimposed calculated cooling curves for surface
(S), three-quarter radius (3/4R) and center (C) of a
round bar of 50-mm diameter.
Reference: Not shown in this demo version.
Rafael Colás, George E. Totten, Encyclopedia of Iron, Steel, and Their Alloys, CRC Press, 2016, p. 1597.
Transformation Diagram
Click the image to enlarge the diagram.
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.