AISI 81B45 Steel

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AISI 81B45 Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 8000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Boron improves hardenability. Applications: Gears and parts that require high-strength, toughness, and hardness. Forms: aircraft quality stock, cold finished bar, custom hardened end-quenched bar, hot rolled bar, seamless mechanical tubing.
Key Words:	UNS G81451, ASTM A322, ASTM A519, SAE J404, SAE J412, SAE J770
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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	179 - 223	179 - 223	annealed and cold drawn.
Hardness, Knoop	223	223	Converted from Brinell
Hardness, Rockwell B	93	93	Converted from Brinell
Hardness, Rockwell C	13	13	Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only.
Hardness, Vickers	211	211	Converted from Brinell
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	65 %	65 %	annealed 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	0.0000234 ohm-cm	0.0000234 ohm-cm	Typical steel

Thermal Properties	Metric	English	Comments
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

Component Elements Properties	Metric	English	Comments
Boron, B	0.00050 - 0.0030 %	0.00050 - 0.0030 %
Carbon, C	0.43 - 0.48 %	0.43 - 0.48 %
Chromium, Cr	0.35 - 0.55 %	0.35 - 0.55 %
Iron, Fe	97.042 - 98.0395 %	97.042 - 98.0395 %	As remainder
Manganese, Mn	0.75 - 1.0 %	0.75 - 1.0 %
Molybdenum, Mo	0.080 - 0.15 %	0.080 - 0.15 %
Nickel, Ni	0.20 - 0.40 %	0.20 - 0.40 %
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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