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AISI 4118 Steel, direct quenched from pot, carburized, 150°C (300°F) temper
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Low Carbon Steel

Material Notes: Heat treatment: Direct quenched from pot, carburized at 925°C for 8 hrs., quenched in agitated oil, 150°C (300°F) temper, 1.6 mm case depth.

Key Words: alloy steels, UNS G41180, ASTM A322, ASTM A331, ASTM A505, ASTM A519
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Physical PropertiesOriginal ValueComments
Density 7.85 g/cc
 
Mechanical PropertiesOriginal ValueComments
Hardness, Brinell 352
Hardness, Knoop 381Converted from Brinell
Hardness, Rockwell B 99Converted from Brinell
Hardness, Rockwell C 39Converted from Brinell
Hardness, Vickers 372Converted from Brinell
Tensile Strength, Ultimate 1225 MPa
Tensile Strength, Yield 903 MPa
Elongation at Break 9.0 %in 50 mm
Reduction of Area 42.3 %
Modulus of Elasticity 205 GPaTypical for steel
Bulk Modulus 160 GPaTypical for steel
Poissons Ratio 0.29Calculated
Fatigue Strength 758 MPaspecimen with 1.02 mm case depth, 64 HRC case hardness
 772 MPaspecimen with 0.33 mm case depth, HRC 63 case hardness
Machinability 60 %hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus 80.0 GPaTypical for steel
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.0000245 ohm-cmTypical 4000 series steel
 
Thermal PropertiesOriginal ValueComments
Specific Heat Capacity 0.475 J/g-°CTypical 4000 series steel
Thermal Conductivity 44.5 W/m-KTypical steel
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 0.18 - 0.23 %
Chromium, Cr 0.40 - 0.60 %
Iron, Fe 97.7 - 98.49 %As remainder
Manganese, Mn 0.70 - 0.90 %
Molybdenum, Mo 0.080 - 0.15 %
Phosphorus, P <= 0.035 %
Silicon, Si 0.15 - 0.35 %
Sulfur, S <= 0.040 %

References for this datasheet.

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M4118N / 7474

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