AISI 4150 Steel, normalized at 870°C (1600°F), air cooled, 25 mm (1 in.) round

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AISI 4150 Steel, normalized at 870°C (1600°F), air cooled, 25 mm (1 in.) round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	AISI 4150 is notable for increased hardenability with a small tradeoff in machinability. Best strength and hardness appears in preheat-treated condition. Tailoring carbon content to bar size allows uniform physical attributes to be maintained across a variety of sizes.
Key Words:	Chromium-molybdenum steels, SAE J404, SAE J412, SAE J770, DIN 1.7228, JIS SCM 5 H, JIS SCM 5, UNS G41500, ASTM A322, ASTM A331, ASTM A505, ASTM A519, MIL SPEC MIL-S-11595 (ORD4150)
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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	321	321
Hardness, Knoop	348	348	Converted from Brinell
Hardness, Rockwell B	99	99	Converted from Brinell
Hardness, Rockwell C	35	35	Converted from Brinell
Hardness, Vickers	339	339	Converted from Brinell
Tensile Strength, Ultimate	1160 MPa	168000 psi
Tensile Strength, Yield	731 MPa	106000 psi
Elongation at Break	11.7 %	11.7 %	in 50 mm
Reduction of Area	40.6 %	40.6 %
Modulus of Elasticity	205 GPa	29700 ksi	Typical for steel
Bulk Modulus	160 GPa	23200 ksi	Typical for steels
Poissons Ratio	0.29	0.29	Calculated
Machinability	55 %	55 %	annealed and cold drawn; based on AISI 1212 as 100% machinability
Shear Modulus	80.0 GPa	11600 ksi	Typical for steels

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	0.48 - 0.53 %	0.48 - 0.53 %
Chromium, Cr	0.80 - 1.1 %	0.80 - 1.1 %
Iron, Fe	96.745 - 97.67 %	96.745 - 97.67 %	As remainder
Manganese, Mn	0.75 - 1.0 %	0.75 - 1.0 %
Molybdenum, Mo	0.15 - 0.25 %	0.15 - 0.25 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.15 - 0.30 %	0.15 - 0.30 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M415AF / 7632

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