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OVERVIEW SPECIFICATIONS AND TECHNICAL INFORMATION

See Alloy Steel Tolerances

Alloy Steel Round Bar 4340 Annealed Cold Finish has high strength, toughness, wear resistance, and fatigue strength. It can be machined in all states other than hardened and it is easily welded. Additionally, 4340 can be cold worked easily. It is typically used in military aircraft, automotive systems, hydraulic parts, machine tools, and a steel crankshafts.

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Dimension Name

Specification

Alloy 4340
Temper Annealed
Production Method Hot Rolled
Diameter 1
Max Length 144
MTR Availability Yes
Full Length true
Material Alloy Steel
Shape Bar-Round
Custom Cut Warehouse 1
Material Specifications

This material meets the following specs: ASTM -A322, AMS -6415, AMS -6484(call for availability), ASTM -A29

Weight/Lineal Foot

2.67 pounds
Please note that this data is to be used ONLY FOR REFERENCE, NOT FOR DESIGN, and by using it,you agree that any decisions you make regarding materials for your project are at your own discretion.

Mechanical Properties

Property Value
Brinell Hardness 500 kg load 217
Rockwell Hardness B Scale 95
Elongation Typical % 22
Density g/cm^3 7
Melting Point °F 2580 - 2650
Modulus of Elasticity KSI x 10^3 27
Reduction of Area % 50
Specific Heat BTU/lb-°F (32-212F) 1
Thermal Conductivity BTU-in/hr-ft^2-°F 309
Tensile Strength KSI 108
Yield Strength KSI 68
Shear Strength KSI 63

Chemistry Information: 4340 Alloy Steel

Element Percentage
C 0.37 - 0.43
Cr 0.8
Fe 96
Mn 0.7
Ni 1.83
P 0.035 max
S 0.04 max
Si 0.23
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