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AISI 8740 Steel, normalized 870°C (1600°F), 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:
Normalized at 870°C, air cooled, 50 mm round
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
Original Value
Comments
Density
7.85
g/cc
Mechanical Properties
Original Value
Comments
Hardness, Brinell
262
Hardness, Knoop
287
Converted from Brinell
Hardness, Rockwell B
98
Converted from Brinell
Hardness, Rockwell C
26
Converted from Brinell
Hardness, Vickers
276
Converted from Brinell
Tensile Strength, Ultimate
910
MPa
Tensile Strength, Yield
605
MPa
Elongation at Break
16.7 %
in 50 mm
Modulus of Elasticity
205
GPa
Typical for steel
Bulk Modulus
160
GPa
Typical for steel.
Poissons Ratio
0.29
Calculated
Machinability
65 %
annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus
80.0
GPa
Typical for steel
Electrical Properties
Original Value
Comments
Electrical Resistivity
0.0000234
ohm-cm
Typical steel
Thermal Properties
Original Value
Comments
Specific Heat Capacity
0.475
J/g-°C
Typical steel
Thermal Conductivity
46.6
W/m-K
Typical steel
Component Elements Properties
Original Value
Comments
Carbon, C
0.38 - 0.43 %
Chromium, Cr
0.40 - 0.60 %
Iron, Fe
96.595 - 97.72 %
As remainder
Manganese, Mn
0.75 - 1.0 %
Molybdenum, Mo
0.20 - 0.30 %
Nickel, Ni
0.40 - 0.70 %
Phosphorus, P
<= 0.035 %
Silicon, Si
0.15 - 0.30 %
Sulfur, S
<= 0.040 %
References
for this datasheet.
Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's
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AISI 8740 Steel, normalized 870°C (1600°F)
AISI 8740 Steel, normalized 870°C (1600°F), 25 mm (1 in.) round
M874AF / 8579
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