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AISI 4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 25 mm round
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel

Material Notes: AISI 4340 has a favorable response to heat treatment (usually oil quenching followed by tempering) and exhibits a good combination of ductility and strength when treated thusly. Uses include piston pins, bearings, ordnance, gears, dies, and pressure vessels.

Key Words: alloy steels, UNS G43400, AMS 5331, AMS 6359, AMS 6414, AMS 6415, ASTM A322, ASTM A331, ASTM A505, ASTM A519, ASTM A547, ASTM A646, MIL SPEC MIL-S-16974, B.S. 817 M 40 (UK), SAE J404, SAE J412, SAE J770, DIN 1.6565, JIS SNCM 8, IS 1570 40Ni2Cr1Mo28, IS 1570 40NiCr1Mo15
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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 1207 MPa
Tensile Strength, Yield 1145 MPa
Elongation at Break 14.2 %
Reduction of Area 45.9 %
Modulus of Elasticity 200 GPa
Bulk Modulus 159 GPaEstimated from elastic modulus
Poissons Ratio 0.29Typical for steel
Machinability 50 %annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus 78.0 GPaEstimated from elastic modulus
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.0000248 ohm-cm
@Temperature 20.0 °C
 0.0000298 ohm-cm
@Temperature 100 °C
 0.0000552 ohm-cm
@Temperature 400 °C
 0.0000797 ohm-cm
@Temperature 600 °C
 
Thermal PropertiesOriginal ValueComments
CTE, linear 12.3 µm/m-°C
@Temperature 20.0 °C
specimen oil hardened, 600°C (1110°F) temper
 12.6 µm/m-°C
@Temperature 21.0 - 260 °C
1.88% Ni, normalized and tempered
 12.7 µm/m-°C
@Temperature 20.0 °C
specimen oil hardened, 600°C (1110°F) temper
 13.7 µm/m-°C
@Temperature 250 °C
specimen oil hardened, 600°C (1110°F) temper
 13.7 µm/m-°C
@Temperature 21.0 - 540 °C
1.88% Ni, normalized and tempered
 13.9 µm/m-°C
@Temperature 21.0 - 540 °C
1.90% Ni, quenched, tempered
 14.5 µm/m-°C
@Temperature 500 °C
specimen oil hardened, 600°C (1110°F) temper
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 0.37 - 0.43 %
Chromium, Cr 0.70 - 0.90 %
Iron, Fe 95.195 - 96.33 %As remainder
Manganese, Mn 0.60 - 0.80 %
Molybdenum, Mo 0.20 - 0.30 %
Nickel, Ni 1.65 - 2.0 %
Phosphorus, P <= 0.035 %
Silicon, Si 0.15 - 0.30 %
Sulfur, S <= 0.040 %

References for this datasheet.

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M434AG / 7757

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