AISI 4140 Steel

Steel name: AISI 4140
Diagram No.: 4969
Type of diagram: CHT (Continuous Heating Transformation)
Mat. No (Wr.Nr) designation: 1.7225
DIN designation: 42CrMo4
EN designation: 42CrMo4
AISI/SAE designation: AISI 4140
JIS designation: SCM 4 H
Chemical composition in weight %: 0.38-0.43% C, 0.14-0.35% Si, 0.75-1.00% Mn, max. 0.040% P, max. 0.040% S, 0.80-1.10% Cr, 0.15-0.25% Mo
Steel group: Structural steels
Note: Continuous heating transformation diagram for AISI 4140 steel. The phase being formed is austenite. Figure shows an example for continuous heating of the same steel as in No. 4968. Indicated again are Ac1 and Ac3 and the same remarks as before are valid. The diagram was derived with constant heating rates and curves for 130 °C/s (265 °F/s), 10 °C/s (50 °F/s), and 0.2 °C/s (32 °F/s) are shown. Notice that the start and finish of the transformations are delayed relative to the isothermal diagram. This is generally true when one compares an isothermal and a continuous diagram, regardless of whether they are for heating or cooling.
Reference: Not shown in this demo version.

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