AISI 8620 Steel, double quenched and tempered (230°C (450°F)), 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. % C 0.18 - 0.23   Cr 0.4 - 0.6   Fe 96.9 - 98.02

Component    Wt. % Mn 0.7 - 0.9   Mo 0.15 - 0.25   Ni 0.4 - 0.7

Component    Wt. % P Max 0.035   S Max 0.04   Si 0.15 - 0.35

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

Physical Properties	Metric	English	Comments
Density	7.85 g/cc	0.284 lb/in³
Mechanical Properties
Hardness, Brinell	262	262
Hardness, Knoop	287	287	Converted from Brinell hardness.
Hardness, Rockwell B	98	98	Converted from Brinell hardness.
Hardness, Rockwell C	61	61	case hardness.
Hardness, Vickers	276	276	Converted from Brinell hardness.
Tensile Strength, Ultimate	898 MPa	130000 psi
Tensile Strength, Yield	533 MPa	77300 psi
Elongation at Break	22.5 %	22.5 %	in 50 mm.
Reduction of Area	51.7 %	51.7 %
Modulus of Elasticity	205 GPa	29700 ksi	Typical for steel
Bulk Modulus	140 GPa	20300 ksi	Typical for steels
Poisson's Ratio	0.29	0.29	Calculated
Machinability	65 %	65 %	hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	80 GPa	11600 ksi	Typical for steel.
Electrical Properties
Electrical Resistivity	2.34e-005 ohm-cm	2.34e-005 ohm-cm	Typical steel
Thermal Properties
Specific Heat Capacity	0.475 J/g-°C	0.114 BTU/lb-°F	Typical steel
Thermal Conductivity	46.6 W/m-K	323 BTU-in/hr-ft²-°F	Typical steel

References for this datasheet.