AISI 8740 Steel, oil quenched 830°C (1525°F), 650°C (1200°F) temper, 50 mm (2 in.) round

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AISI 8740 Steel, oil quenched 830°C (1525°F), 650°C (1200°F) temper, 50 mm (2 in.) round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 8000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Post oil quenched hardness 52 HRC surface, 49 HRC half-radius, 45 HRC center
Key Words:	DIN 1.6546, UNI 40 NiCrMo 2 KB, B.S. Type 7, ASTM A331, ASTM A505, ASTM A519, MIL-SPEC MIL-S-6049, SAE J404, SAE J412, SAE J770, UNS G87400, AMS 6322, AMS 6323, AMS 6325, AMS 6327, AMS 6358, ASTM A322
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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	255	255
Hardness, Knoop	279	279	Converted from Brinell
Hardness, Rockwell B	98	98	Converted from Brinell
Hardness, Rockwell C	25	25	Converted from Brinell
Hardness, Vickers	269	269	Converted from Brinell
Tensile Strength, Ultimate	876 MPa	127000 psi
Tensile Strength, Yield	731 MPa	106000 psi
Elongation at Break	21.5 %	21.5 %	in 50 mm
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
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
Carbon, C	0.38 - 0.43 %	0.38 - 0.43 %
Chromium, Cr	0.40 - 0.60 %	0.40 - 0.60 %
Iron, Fe	96.595 - 97.72 %	96.595 - 97.72 %	As remainder
Manganese, Mn	0.75 - 1.0 %	0.75 - 1.0 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	0.40 - 0.70 %	0.40 - 0.70 %
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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M874AR / 8591

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