18CrNiMo7-6 Steel - Hardenability Diagram

18CrNiMo7-6 Steel

Steel name: 18CrNiMo7-6
Diagram No.: 1454
DIN designation: 18CrNiMo7-6
Mat.No. (Wr.Nr.) designation: 1.6587
Chemical composition in weight %: 0.15-0.21% C, 1.50-1.80% Cr, 0.25-0.35% Mo, 1.40-1.70% Ni
Steel group: Case hardening steels
Applications: Gears
Comment: Figure shows the effect of compositional modifications on the hardenability of a 0.18% C reference carburizing steel (18CrNiMo7-6). The powerful effect of adding carbide formers is apparent. In this figure, the solid line shows the hardenability of the reference steel. Raising the Ni content and lowering Mo (bottom dashed line) raises core toughness by promoting bainite formation, but decreases case hardness by increasing the fraction of retained austenite after carburization. Alloying with a combination of Mo and special carbide formers (top dashed line) raises the hardness of the component uniformly, and increases the case hardness above the basic hardness of 0f 0.18% C steel (dotted line).
Jominy test results on two modified 18CrNiMo7-6 (solid line) steels, showing how Mo additions can improve the performance of windmill gearboxes.
Reference: Not shown in this demo version.

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Hardenability Diagram

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Other Steel Data links:
Carbides in Steel
CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants
Transformation Diagrams of Non-Ferrous Alloys
Tempering Diagrams of Steels

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