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Specialty Compounds RTP Company

AISI 4340 Steel, oil quenched 855°C (1570°F), 230°C (450°F) temper for 4 hrs.
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 PropertiesMetricEnglishComments
Density 7.85 g/cc0.284 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Knoop 555555Converted from Vickers hardness.
 572
@Temperature -78.0 °C		572
@Temperature -108 °F		Converted from Vickers hardness
 666
@Temperature -195 °C		666
@Temperature -319 °F		Converted from Vickers hardness
 851
@Temperature -255 °C		851
@Temperature -427 °F		Converted from Vickers hardness
Hardness, Vickers 531531
 548
@Temperature -78.0 °C		548
@Temperature -108 °F
 639
@Temperature -195 °C		639
@Temperature -319 °F
 818
@Temperature -255 °C		818
@Temperature -427 °F
Tensile Strength, Ultimate 1855 MPa269000 psi
 2020 MPa
@Temperature -78.0 °C		293000 psi
@Temperature -108 °F
 2200 MPa
@Temperature -195 °C		319000 psi
@Temperature -319 °F
 2290 MPa
@Temperature -255 °C		332000 psi
@Temperature -427 °F
Tensile Strength, Yield 1550 MPa225000 psi
 1915 MPa
@Temperature -195 °C		277700 psi
@Temperature -319 °F
 1935 MPa
@Temperature -78.0 °C		280600 psi
@Temperature -108 °F
Elongation at Break 12 %12 %
 0.60 %
@Temperature -255 °C		0.60 %
@Temperature -427 °F
 10 %
@Temperature -195 °C		10 %
@Temperature -319 °F
 12 %
@Temperature -78.0 °C		12 %
@Temperature -108 °F
Reduction of Area 40 %40 %
 0.60 %
@Temperature -255 °C		0.60 %
@Temperature -427 °F
 24 %
@Temperature -195 °C		24 %
@Temperature -319 °F
 40 %
@Temperature -78.0 °C		40 %
@Temperature -108 °F
Modulus of Elasticity 196 GPa28400 ksi
 210 GPa
@Temperature -255 °C		30500 ksi
@Temperature -427 °F
 211 GPa
@Temperature -78.0 °C		30600 ksi
@Temperature -108 °F
 211 GPa
@Temperature -195 °C		30600 ksi
@Temperature -319 °F
Bulk Modulus 160 GPa23200 ksiTypical for steel.
Poissons Ratio 0.300.30Calculated
Machinability 50 %50 %annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus 75.0 GPa10900 ksiEstimated from elastic modulus
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity  0.0000248 ohm-cm
@Temperature 20.0 °C		0.0000248 ohm-cm
@Temperature 68.0 °F
 0.0000298 ohm-cm
@Temperature 100 °C		0.0000298 ohm-cm
@Temperature 212 °F
 0.0000552 ohm-cm
@Temperature 400 °C		0.0000552 ohm-cm
@Temperature 752 °F
 0.0000797 ohm-cm
@Temperature 600 °C		0.0000797 ohm-cm
@Temperature 1110 °F
 
Thermal PropertiesMetricEnglishComments
CTE, linear  12.3 µm/m-°C
@Temperature 20.0 °C		6.83 µin/in-°F
@Temperature 68.0 °F		specimen oil hardened, 600°C (1110°F) temper
 12.6 µm/m-°C
@Temperature 21.0 - 260 °C		7.00 µin/in-°F
@Temperature 69.8 - 500 °F		1.88% Ni, normalized and tempered
 12.7 µm/m-°C
@Temperature 20.0 °C		7.06 µin/in-°F
@Temperature 68.0 °F		specimen oil hardened, 600°C (1110°F) temper
 13.7 µm/m-°C
@Temperature 250 °C		7.61 µin/in-°F
@Temperature 482 °F		specimen oil hardened, 600°C (1110°F) temper
 13.7 µm/m-°C
@Temperature 21.0 - 540 °C		7.61 µin/in-°F
@Temperature 69.8 - 1000 °F		1.88% Ni, normalized and tempered
 13.9 µm/m-°C
@Temperature 21.0 - 540 °C		7.72 µin/in-°F
@Temperature 69.8 - 1000 °F		1.90% Ni, quenched, tempered
 14.5 µm/m-°C
@Temperature 500 °C		8.06 µin/in-°F
@Temperature 932 °F		specimen oil hardened, 600°C (1110°F) temper
Specific Heat Capacity 0.475 J/g-°C0.114 BTU/lb-°FTypical 4000 series steel
Thermal Conductivity 44.5 W/m-K309 BTU-in/hr-ft²-°FTypical steel
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.37 - 0.43 %0.37 - 0.43 %
Chromium, Cr 0.70 - 0.90 %0.70 - 0.90 %
Iron, Fe 95.195 - 96.33 %95.195 - 96.33 %As remainder
Manganese, Mn 0.60 - 0.80 %0.60 - 0.80 %
Molybdenum, Mo 0.20 - 0.30 %0.20 - 0.30 %
Nickel, Ni 1.65 - 2.0 %1.65 - 2.0 %
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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M434AV / 7772




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