4340 (United States / AISI) Material Properties

Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: United States / AISI

Data updates

Latest Update: 2024-07
Total number of updates: 16
Update History:
2023-11 2023-05 2023-03 2020-11 2020-08 2020-06 2020-03 2019-09 2019-03 2018-01 2017-05 2017-02 2016-03 2015-12 2015-04

Mechanical Properties

Temperature

≤ 0°C
0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Yield Strength, Rp0.2 val1
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MPa view details
Compression Yield Strength val1
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MPa view details
Tensile Strength 1051.9 — 2281.5 MPa view details
Tensile Strength val1
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MPa view details
Elongation, A 0.6 — 20.4 % view details
Elongation, A val1
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% view details
Reduction of Area val1
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% view details
Impact Energy val1
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J view details
Impact Energy val1
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J view details
Brinell Hardness (HB) 187 — 322 view details
Rockwell Hardness (HR) val1
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Grain Size val1
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Yield Strength, Rp0.2 val1
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ksi view details
Yield Strength, Rp0.2 val1
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ksi view details
Compression Yield Strength val1
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ksi view details
Tensile Strength 152.6 — 330.9 ksi view details
Tensile Strength val1
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ksi view details
Elongation, A 0.6 — 20.4 % view details
Elongation, A val1
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% view details
Reduction of Area val1
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% view details
Impact Energy val1
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ft·lb view details
Impact Energy val1
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ft·lb view details
Brinell Hardness (HB) 187 — 322 view details
Rockwell Hardness (HR) val1
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Grain Size val1
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Physical Properties

Temperature

≤ 0°C
0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Compression Modulus 200 GPa view details
Shear Modulus val1
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GPa view details
Density val1
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kg/dm³ view details
Poisson Coefficient val1
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Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Thermal Conductivity val1
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W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Heat Capacity val1
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J/(kg∙°C) view details
Heat Capacity val1
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J/(kg∙°C) view details
Heat Capacity val1
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J/(kg∙°C) view details
Electrical Resistivity 0.182 — 0.31 Ω∙mm²/m view details
Electrical Resistivity val1
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Ω∙mm²/m view details
Electrical Conductivity val1
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S/m view details
Electrical Conductivity val1
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S/m view details
Modulus of Elasticity 27.6 E+03 — 30.5 E+03 ksi view details
Compression Modulus 29 E+03 ksi view details
Shear Modulus val1
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ksi view details
Density val1
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lb/in³ view details
Poisson Coefficient val1
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view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Heat Capacity val1
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BTU/(lb∙°F) view details
Heat Capacity val1
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BTU/(lb∙°F) view details
Heat Capacity val1
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BTU/(lb∙°F) view details
Electrical Resistivity 302 E-06 — 515 E-06 Ω∙circular·mil/ft view details
Electrical Resistivity val1
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Ω∙circular·mil/ft view details
Electrical Conductivity val1
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S/in view details
Electrical Conductivity val1
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S/in view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.38 – 0.43
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.70 – 0.90
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Cu
VALUE
≤ 0.35
UNIT
%
CAS NUMBER
7440-50-8
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
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UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
Pb
VALUE
val1
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UNIT
%
CAS NUMBER
7439-92-1
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3

SAE J 404: 2009 / Chemical compositions of SAE alloy steels

Heat Treatments

  • Normalizing: 871-927°C (1600-1700°F), air quenched. Annealing: 829-857°C (1525-1575°F). Furnace cool to 538°C (1000°F) or below (rate of furnace cool should be 28°C (50°F) per hour or slower). Recommended subcritical anneal temperature is 677°C (1250°F).<br />Austenitizing: 816-843°C (1500-1550°F). Medium for quenching: oil.
  • Normalized by heating to 870-925°C in an atmosphere neutral to the specified carbon range, holding at heat for not less than 1 hour per 25 mm of maximum cross-section and cooling in air to room temperature and tempered by heating to not lower than 595°C, holding at heat for not less than1 hour and cooling in air. Harden by heating to 815°C +/-15°C holding at heat for not less than 30 minutes and quenching in oil. Double temper by heating to 425°C +/-8°C holding at heat for 2 hours +/-15 minutes and cooling in air after each tempering operation.