AISI 4718 Steel, pseudocarburized, reheated to 850°C (1560°F) and oil quenched, 150°C (300°F) temper, 13.7 mm round

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AISI 4718 Steel, pseudocarburized, reheated to 850°C (1560°F) and oil quenched, 150°C (300°F) temper, 13.7 mm round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Low Carbon Steel
Material Notes:	Full heat treatment: normalized at 925°C (1700°F), machined to 25 mm (1 in.), pseudocarburized at 925°C (1700°F) for 8 hours, box cooled to RT, reheated to 850°C (1560°F), 150°C (300°F) temper, machined and tested in 12.8 mm (0.505 in.) rounds
Key Words:	alloy steels, UNS G47180, ASTM A322, ASTM A331, ASTM A505, SAE J404, SAE J412, SAE J770, DIN 1.6755
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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	1172 MPa	170000 psi
Tensile Strength, Yield	841 MPa	122000 psi
Elongation at Break	13 %	13 %
Reduction of Area	52 %	52 %
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
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	0.16 - 0.21 %	0.16 - 0.21 %
Chromium, Cr	0.35 - 0.55 %	0.35 - 0.55 %
Iron, Fe	96.31 - 97.39 %	96.31 - 97.39 %	As remainder
Manganese, Mn	0.70 - 0.90 %	0.70 - 0.90 %
Molybdenum, Mo	0.30 - 0.40 %	0.30 - 0.40 %
Nickel, Ni	0.90 - 1.2 %	0.90 - 1.2 %
Phosphorus, P	<= 0.040 %	<= 0.040 %
Silicon, Si	0.20 - 0.35 %	0.20 - 0.35 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M4718G / 7940

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