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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
Metric
English
Comments
Density
7.85
g/cc
0.284
lb/in³
Mechanical Properties
Metric
English
Comments
Hardness, Brinell
262
262
Hardness, Knoop
287
287
Converted from Brinell
Hardness, Rockwell B
98
98
Converted from Brinell
Hardness, Rockwell C
26
26
Converted from Brinell
Hardness, Vickers
276
276
Converted from Brinell
Tensile Strength, Ultimate
910
MPa
132000
psi
Tensile Strength, Yield
605
MPa
87700
psi
Elongation at Break
16.7 %
16.7 %
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.
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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