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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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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.