20NiCrMo7 Steel

Steel name: 20NiCrMo7
Diagram No.: 1427
AFNOR designation: 20 NCD 7
EN designation: 20NiCrMo7
AISI/SAE designation: 4320, 4320H, 4320RH
Chemical composition in weight %: See the table
Steel group: Case hardening steels
Applications: No data
Comment: Steel is a high cleanliness case hardening steel used for bearing and transmission components. There are three different modifications of the grade. Jominy hardenability according to ASTM A255. The graph shows the average values and standard deviation for 157C and SAE 4320H range.
Reference: Not shown in this demo version.

Heat Treatment
QT: 840 - 890 C/oil, hardening of as-carburized component: 780 - 830 C/oil, tempering: 160-250 C/air.

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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