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4130 Steel
Steel name: 4130
Diagram No.: 5532
Type of diagram: TTP
AISI/SAE designation: 4130
Chemical composition in weight %:
Low specification: 0.28% C, 0.15% Si, 0.40% Mn, 0.80% Cr, 0.15% Mo, 0.15% Cu
Actual composition: 0.29% C, 0.24% Si, 0.55% Mn, 1.02% Cr, 0.15% Mo, 0.15% Cu
Steel group: Low alloy steels
Note: Approximate TTP curves have been developed for the compositions of 4130 steel. These TTP curves are
illustrated in Fig. These C curves are plotted for times to 1000 s (16.7 min) rather than the usual 10 exp(6) s (20 days) used
in many published diagrams. Transformations that occur over a 20 day period are of little interest in heat-treating
operations. At 595 °C (1100 °F), the transformation begins in about 0.15 s in the low specification composition, in 1 s in
the actual composition, and after about 3 s in the high specification composition. The C curves illustrate the shift in the
start of transformation with alloy content. The mathematical expression describing the curves allows hardness predictions
to be made under a wide variety of quenching conditions.
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.