AISI 4118 Steel, direct quenched from pot, carburized, 150°C (300°F) temper

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AISI 4118 Steel, direct quenched from pot, carburized, 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:	Heat treatment: Direct quenched from pot, carburized at 925°C for 8 hrs., quenched in agitated oil, 150°C (300°F) temper, 1.6 mm case depth.
Key Words:	alloy steels, UNS G41180, ASTM A322, ASTM A331, ASTM A505, ASTM A519
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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	352	352
Hardness, Knoop	381	381	Converted from Brinell
Hardness, Rockwell B	99	99	Converted from Brinell
Hardness, Rockwell C	39	39	Converted from Brinell
Hardness, Vickers	372	372	Converted from Brinell
Tensile Strength, Ultimate	1225 MPa	177700 psi
Tensile Strength, Yield	903 MPa	131000 psi
Elongation at Break	9.0 %	9.0 %	in 50 mm
Reduction of Area	42.3 %	42.3 %
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
Fatigue Strength	758 MPa	110000 psi	specimen with 1.02 mm case depth, 64 HRC case hardness
	772 MPa	112000 psi	specimen with 0.33 mm case depth, HRC 63 case hardness
Machinability	60 %	60 %	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	0.18 - 0.23 %	0.18 - 0.23 %
Chromium, Cr	0.40 - 0.60 %	0.40 - 0.60 %
Iron, Fe	97.7 - 98.49 %	97.7 - 98.49 %	As remainder
Manganese, Mn	0.70 - 0.90 %	0.70 - 0.90 %
Molybdenum, Mo	0.080 - 0.15 %	0.080 - 0.15 %
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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M4118N / 7474

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