20NiCrMo2-2+HH Steel - Hardenability Diagram

20NiCrMo2-2+HH Steel

Steel name: 20NiCrMo2-2+HH
Diagram No.: 1707
DIN designation: 20NiCrMo2-2
Mat.No. (Wr.Nr.) designation: 1.6523
Chemical composition in weight %: 0.17-0.23% C, max. 0.40% Si, 0.65-0.95% Mn, max. 0.035% P, max. 0.035% S, 0.35-0.70% Cr, 0.40-0.70% Ni, 0.15-0.25% Mo
Steel group: Case hardening steels
Applications: Small diameter gear parts exposed to low-medium stress. Typical components include gears, planet wheels, drive pinions, shafts.
Comment: Hardness limits for Jominy test EN 10084 specification for 20NiCrMo2-2+HH (1.6523)
Reference: Not shown in this demo version.

Heat Treatment
Carburising: 880 - 960 C/Oil (water), hot quench 160-250°C, salt bath 580-650°C, case hardening box, air
Intermediate annealing: 630 - 650 C/Air, furnace
Core hardening: 860 – 900 C/Oil (water), hot quench 160-250°C
Case hardening: 780 – 820 C/Oil (water), hot quench 160-250°C
Tempering: 150 - 200 C/air

Hardenability Diagram

Click the image to enlarge the diagram.

Disclaimer: The material data is a central depository of information based on global actual tests and calculated software data that is available to the public for a fee. The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as the become available.