7C, 7NbMo, 7V Rail Steels

Steel name: 7C, 7NbMo, 7V rail steels
Diagram No.: 8181
Type of diagram: TTT
Chemical composition in weight %:
7C steel: 0.74% C, 0.30% Si, 0.79% Mn, 0.018% P, 0.009% S
7NbMo steel: 0.71% C, 0.43% Si, 0.84% Mn, 0.017% P, 0.008% S, 0.203% Mo, 0.02% Nb
7V steel: 0.69% C, 0.55% Si, 0.88% Mn, 0.007% P, 0.011% S, 0.13% V
Steel group: Rail steels
Note: Isothermal transformation (ITT) diagrams for 7C, 7NbMo and 7V steels.
Reference: Not shown in this demo version.
Rezende, A. B., et al. “Effect of Alloy Elements in Time Temperature Transformation Diagrams of Railway Wheels.” Defect and Diffusion Forum, vol. 400, Trans Tech Publications, Ltd., Mar. 2020, pp. 11–20. Crossref, doi:10.4028/www.scientific.net/ddf.400.11

Transformation Diagram


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Dilatometric Curves for 7C, 7V and 7NbMo Steels with Isothermal Treatment at 700, 650, 300 and 200°C


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Austenite and martensite transformation temperatures for 7C, 7NbMo, and 7V steels


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