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SAE-AISI 4140 Steel vs. R60706 Alloy

SAE-AISI 4140 steel belongs to the iron alloys classification, while R60706 alloy belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is R60706 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
98
Elongation at Break, % 11 to 26
16
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 73
37
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
580
Tensile Strength: Yield (Proof), MPa 590 to 990
390

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Specific Heat Capacity, J/kg-K 470
270
Thermal Conductivity, W/m-K 43
17
Thermal Expansion, µm/m-K 13
6.3

Otherwise Unclassified Properties

Density, g/cm3 7.8
6.7
Embodied Water, L/kg 51
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
82
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
760
Stiffness to Weight: Axial, points 13
8.1
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 25 to 38
24
Strength to Weight: Bending, points 22 to 30
23
Thermal Diffusivity, mm2/s 12
9.5
Thermal Shock Resistance, points 20 to 32
67

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.050
Chromium (Cr), % 0.8 to 1.1
0 to 0.2
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 96.8 to 97.8
0 to 0.2
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.15 to 0.25
0
Niobium (Nb), % 0
2.0 to 3.0
Nitrogen (N), % 0
0 to 0.025
Oxygen (O), % 0
0 to 0.16
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Zirconium (Zr), % 0
91 to 98