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


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