AISI 4620 Steel, double quenched and tempered, carburized, oil quenched, 150°C (300°F) temper

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AISI 4620 Steel, double quenched and tempered, carburized, oil quenched, 150°C (300°F) temper
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Low Carbon Steel
Material Notes:	Double quenched and tempered: carburized at 925°C (1700°F) for 8 hrs., pot cooled, reheated to 830°C (1525°F), quenched in agitated oil, reheated to 800°C (1470°F), quenched in agitated oil, 150°C (300°F) temper. 1.5 mm case depth.
Key Words:	SAE J404, SAE J412, SAE J797, UNS G46200, AMS 6294, ASTM A322, ASTM A331, ASTM A505, ASTM A535, MIL SPEC MIL-S-7493 (A4620)
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Physical Properties	Metric	English	Comments

Density	7.85 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	248	248	Core Property
Hardness, Knoop	272	272	Converted from Brinell
Hardness, Rockwell B	98	98	Converted from Brinell
Hardness, Rockwell C	23	23	case hardness at 1.5 mm. Peak case hardness: 64 HRC at 0.94 mm, 63 HRC at 0.38 mm
Hardness, Vickers	261	261	Converted from Brinell
Tensile Strength, Ultimate	841.2 MPa	122000 psi
Tensile Strength, Yield	533 MPa	77300 psi
Elongation at Break	22 %	22 %	in 50 mm
Reduction of Area	55.7 %	55.7 %
Modulus of Elasticity	205 GPa	29700 ksi	Typical for steel
Bulk Modulus	160 GPa	23200 ksi	Typical for steel
Poissons Ratio	0.29	0.29	Calculated
Fracture Toughness	33.0 - 49.4 MPa-m½	30.0 - 45.0 ksi-in½	cracks originating in case; case depth 0.30 to 0.35 in.
	71.4 - 115 MPa-m½	65.0 - 105 ksi-in½	cracks originating in core
Machinability	65 %	65 %	Hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	80.0 GPa	11600 ksi	Typical for steel

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000245 ohm-cm	0.0000245 ohm-cm	Typical 4000 series steel

Thermal Properties	Metric	English	Comments
Specific Heat Capacity	0.475 J/g-°C	0.114 BTU/lb-°F	Typical 4000 series steel
Thermal Conductivity	44.5 W/m-K	309 BTU-in/hr-ft²-°F	Typical steel

Component Elements Properties	Metric	English	Comments
Carbon, C	0.17 - 0.22 %	0.17 - 0.22 %
Iron, Fe	96.405 - 97.38 %	96.405 - 97.38 %	As remainder
Manganese, Mn	0.45 - 0.65 %	0.45 - 0.65 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	1.65 - 2.0 %	1.65 - 2.0 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.15 - 0.35 %	0.15 - 0.35 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M462BB / 7899

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