AISI 8620 Steel, double quenched and tempered (230C (450F)), carburized

Subcategory: AISI 8000 Series Steel; Ferrous Metal; Low Alloy Steel; Low Carbon Steel; Metal

Close Analogs: AISI 8620H

Key Words: AFNOR 22 NCD 2, UNI 20 NiCrMo 2, JIS SNCM 21 H, JIS SNCM 21, MIL SPEC MIL-S-16794, SAE J404, SAE J770, DIN 1.6523, AFNOR 20 NCD 2 (France), B.S. 805 H 20 (UK), B.S. 805 M 20 (UK), UNS G86200, AMS 6274, AMS 6276, AMS 6277, ASTM A322, ASTM A331, ASTM A505, ASTM A531

Component   Wt. %
C0.18 - 0.23 
Cr0.4 - 0.6 
Fe96.9 - 98.02 
Component   Wt. %
Mn0.7 - 0.9 
Mo0.15 - 0.25 
Ni0.4 - 0.7 
Component   Wt. %
PMax 0.035 
SMax 0.04 
Si0.15 - 0.35 

Material Notes:
Double quenched and tempered: carburized at 925C (1700F) for 8 hrs., pot cooled, reheated to 845C (1550F), quenched in agitated oil, reheated to 800C (1470F), quenched in agitated oil, 230C (450F) temper. 1.8 mm case depth. Core properties.

Physical PropertiesMetricEnglishComments
Density7.85 g/cc0.284 lb/in 

Mechanical Properties
Hardness, Brinell262262 
Hardness, Knoop287287 Converted from Brinell hardness.
Hardness, Rockwell B9898 Converted from Brinell hardness.
Hardness, Rockwell C6161 case hardness.
Hardness, Vickers276276 Converted from Brinell hardness.
Tensile Strength, Ultimate898 MPa130000 psi 
Tensile Strength, Yield533 MPa77300 psi 
Elongation at Break22.5 %22.5 % in 50 mm.
Reduction of Area51.7 %51.7 % 
Modulus of Elasticity205 GPa29700 ksi Typical for steel
Bulk Modulus140 GPa20300 ksi Typical for steels
Poisson's Ratio0.290.29 Calculated
Machinability65 %65 % hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus80 GPa11600 ksi Typical for steel.

Electrical Properties
Electrical Resistivity2.34e-005 ohm-cm2.34e-005 ohm-cm Typical steel

Thermal Properties
Specific Heat Capacity0.475 J/g-C0.114 BTU/lb-F Typical steel
Thermal Conductivity46.6 W/m-K323 BTU-in/hr-ft-F Typical steel

References for this datasheet.

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