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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