20NiCrMo2-2 Steel

Steel name: 20NiCrMo2-2
Table No.: 1749
DIN designation: 21NiCrMo2
Mat.No. (Wr.Nr.) designation: 1.6523
AISI/SAE designation: 8620 appr.
EN designation: 20NiCrMo2-2
UNI designation: 20NiCrMo2
AFNOR designation: 20NCD2
BS designation: 805M20
GOST designation: 20HGNM
GB designation: 20CrNiMo
Chemical composition in weight %: 0.17-0.23% C, max. 0.40% Si, 0.65-0.95% Mn, max. 0.025% P, max. 0.035% S, 0.35-0.75% Cr, 0.15-0.25% Mo, 0.40-0.0% Ni
Steel group: Case hardening steels
Applications: No data
Comment: Ac1=735, Av3=820 C, Ms (core)=380 C, Ms (carburized surafce)=200 C.
Reference: Not shown in this demo version.

Heat Treatment
Core hardening: 860-900 C/oil, polymer, salt bath
Carburizing: 880-980 C
Tempering: 150-200 C
Hardenability test
Quenching: 870 C/water

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Macro Defects in Steel
Non-Metallic Inclusions in Steel
Tempering Diagrams of Steels

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