4. Mechanical Properties
Properties Value
Tensile strength 745 MPa
Yield strength 470 MPa
Bulk modulus (typical for steel) 140 GPa
Shear modulus (typical for steel) 80 GPa
Elastic modulus 190-210 GPa
Poisson's ratio 0.27-0.30
Elongation at break 22%
Reduction of area 50%
Hardness, Brinell 217
Hardness, Vickers (converted from
Brinell hardness)
228
5. FAQ'S
• What does 4340 stand
for?
• Limitations of 4340
steel
• How to overcome the
limitations in
manufacturing?
• Any competetive
material?
Image courtsey:http://www.astmsteel.com/steel-
knowledge/steel-grade-4130-vs-4340/