8620 H Steel - Hardenability Diagram

8620 H Steel

Steel name: 8620 H
Diagram No.: 1708
AISI/SAE designation: 8620 H
Chemical composition in weight %: 0.17-0.23% C, max. 0.40% Si, 0.60-0.95% Mn, max. 0.040% P, max. 0.040% S, 0.35-0.65% Cr%, 0.35-0.75% 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 AS 1444 requirement for 8620H
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

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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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