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Elmet Technologies

AISI 8640 Steel, oil quenched 845°C (1550°F), 650°C (1200°F) temper, 100 mm (4 in.) round
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 8000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Key Words: SAE J404, SAE J412, SAE J770, DIN 1.6546, UNI 40 NiCrMo 2 KB, B.S. Type 7, UNS G86400, ASTM A322, ASTM A331, ASTM A505, ASTM A519, MIL-SPEC MIL-S-16974, ISO 683-12 10, ISO 683/VIII 1, ISO 683/VIII 1a, ISO 683/VIII 1b, ISO R683-8 1a, ISO R683-8 1b
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Physical PropertiesMetricEnglishComments
Density 7.85 g/cc0.284 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 219219
Hardness, Knoop 242242Converted from Brinell
Hardness, Rockwell B 9595Converted from Brinell
Hardness, Rockwell C 1717Converted from Brinell hardness. Value below normal HRC range, for comparison only.
Hardness, Vickers 230230Converted from Brinell
Tensile Strength, Ultimate 772 MPa112000 psi
Tensile Strength, Yield 635 MPa92100 psi
Elongation at Break 22 %22 %in 50 mm
Modulus of Elasticity 205 GPa29700 ksiTypical for steel
Bulk Modulus 160 GPa23200 ksiTypical for steel.
Poissons Ratio 0.290.29Calculated
Machinability 65 %65 %annealed and cold drawn. Based on AISI 1212 steel = 100%.
Shear Modulus 80.0 GPa11600 ksiTypical for steel
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000234 ohm-cm0.0000234 ohm-cmTypical steel
 
Thermal PropertiesMetricEnglishComments
Specific Heat Capacity 0.475 J/g-°C0.114 BTU/lb-°FTypical steel
Thermal Conductivity 46.6 W/m-K323 BTU-in/hr-ft²-°FTypical steel
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.38 - 0.43 %0.38 - 0.43 %
Chromium, Cr 0.40 - 0.60 %0.40 - 0.60 %
Iron, Fe 96.645 - 97.77 %96.645 - 97.77 %As remainder
Manganese, Mn 0.75 - 1.0 %0.75 - 1.0 %
Molybdenum, Mo 0.15 - 0.25 %0.15 - 0.25 %
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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AISI 8640 Steel, oil quenched 845°C (1550°F), 540°C (1000°F) temper, 100 mm (4 in.) round
AISI 8640 Steel, quenched 845°C (1550°F), 650°C (1200°F) temper
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M864AL / 8472

Ensinger PEI




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