Product Details, Specifications, and Technical Information
Alloy Steel Round Bar 4340 Normalized 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 in the annealed state. It is typically used in military aircraft, automotive systems, hydraulic parts, machine tools, and a steel crankshafts.

Dimension Name | Specification |
Diameter | 0.3125 |
Max Length | 144 |
Alloy | 4340 |
Temper | Normalized |
Production Method | Cold Finish |
MTR Availability | Yes |
Material | Alloy Steel |
Shape | Bar-Round |
Custom Cut Warehouse | 1 |
Weight/Lineal Foot | ||
0.26 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 | 245 |
Rockwell Hardness B Scale | 100 |
Density g/cm^3 | 7 |
Elongation Typical % | 12 |
Melting Point °F | 2580 - 2650 |
Modulus of Elasticity KSI x 10^3 | 29 |
Reduction of Area % | 36 |
Specific Heat BTU/lb-°F (32-212F) | 1 |
Tensile Strength KSI | 185 |
Thermal Conductivity BTU-in/hr-ft^2-°F | 309 |
Yield Strength KSI | 125 |
Shear Strength KSI | 110 |
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 |