SAE-AISI 4340 Steel vs. K94200 Alloy
Both SAE-AISI 4340 steel and K94200 alloy are iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is K94200 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 140 |
| Elongation at Break, % | 12 to 22 | |
| 5.0 to 32 |
| Poisson's Ratio | 0.29 | |
| 0.34 |
| Shear Modulus, GPa | 73 | |
| 54 |
| Shear Strength, MPa | 430 to 770 | |
| 330 to 410 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 500 to 710 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1150 | |
| 270 to 650 |
Thermal Properties
| Melting Onset (Solidus), °C | 1420 | |
| 1440 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 500 |
| Thermal Conductivity, W/m-K | 44 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 5.0 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 2.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 3.0 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 8.2 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 79 to 170 | |
| 35 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 3490 | |
| 250 to 1460 |
| Stiffness to Weight: Axial, points | 13 | |
| 9.8 |
| Stiffness to Weight: Bending, points | 24 | |
| 21 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 17 to 24 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 17 to 22 |
| Thermal Diffusivity, mm2/s | 12 | |
| 3.7 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 49 to 70 |