Material Type

Metal

Material Sub-Type

Alloy Steel

Material Name

Alloy Steel 4340

Alloy Steel 4340 is a high-strength, low-alloy steel that is known for its toughness and ability to maintain good strength in high temperatures. It is commonly used in the automotive, aerospace, and construction industries due to its durability and ability to withstand extreme conditions. It is also used in the production of machinery parts, bolts, and studs. 4340 steel has high resistance to fatigue and impact, making it an ideal choice for applications where high strength and durability are required.

Cost
Lead Time

3-4 Days

Processes

CNC Machining

Metric

English

Note: Properties are not guaranteed. They are intended only as a basis for comparison and not for design purposes.

Last Updated:4 months ago
Mechanical Properties

Yield Tensile Strength

470 MPa

Ultimate Tensile Strength

745 MPa

Tensile Modulus

207 GPa

Shear Strength

-

Shear Modulus

80 GPa

Fatigue Strength

-

Elongation At Break

22 %

Poisson's Ratio

0.28

Hardness

95 HRB, 17 HRC

Density

7.8 g/cm³

Impact Strength (ASTM)

-

Electrical/Magnetic Properties

Surface Resistance (ANSI)

-

Magnetism

High

Thermal Properties

Heat Deflection Temperature

633 °C

Thermal Expansion Coefficient

12.3 µm/(m⋅°C

Specific Heat Capacity

-

Thermal Conductivity

46 W/(m⋅°C)

Melting Point

1427 °C

Chemical Properties

Corrosion Resistance

Very Good

Alloy Steel 4340

High-strength and impact-resistant alloy steel

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Material Datasheet

Material Type

Metal

Material Sub-Type

Alloy Steel

Material Name

Alloy Steel 4340

Note: Properties are not guaranteed. They are intended only as a basis for comparison and not for design purposes.

Mechanical Properties

Yield Tensile Strength

470 MPa

68.2 Ksi

Ultimate Tensile Strength

745 MPa

108.0 Ksi

Tensile Modulus

207 GPa

30.0 Msi

Shear Strength

-

-

Shear Modulus

80 GPa

11.6 Msi

Fatigue Strength

-

-

Elongation At Break

22 %

-

Poisson's Ratio

0.28

-

Hardness

95 HRB, 17 HRC

-

Density

7.8 g/cm³

0.284 lb/in³

Impact Strength (ASTM)

-

-

Electrical/Magnetic Properties

Surface Resistance (ANSI)

-

-

Magnetism

High

-

Thermal Properties

Heat Deflection Temperature

633 °C

1171 °F

Thermal Expansion Coefficient

12.3 µm/(m⋅°C

6.8 µin/(in⋅°F)

Specific Heat Capacity

-

-

Thermal Conductivity

46 W/(m⋅°C)

26.6 BTU/(h⋅ft⋅°F)

Melting Point

1427 °C

2601 °F

Chemical Properties

Corrosion Resistance

Very Good

-

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