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SAE-AISI 5140 Steel vs. R30075 Cobalt

SAE-AISI 5140 steel belongs to the iron alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 5140 steel and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210 to 250
Elongation at Break, % 12 to 29
12
Fatigue Strength, MPa 220 to 570
250 to 840
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
82 to 98
Tensile Strength: Ultimate (UTS), MPa 560 to 970
780 to 1280
Tensile Strength: Yield (Proof), MPa 290 to 840
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 45
13
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.4
8.1
Embodied Energy, MJ/kg 19
110
Embodied Water, L/kg 49
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 76 to 180
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1880
560 to 1410
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 24
24 to 25
Strength to Weight: Axial, points 20 to 34
26 to 42
Strength to Weight: Bending, points 19 to 28
22 to 31
Thermal Diffusivity, mm2/s 12
3.5
Thermal Shock Resistance, points 16 to 29
21 to 29

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0.38 to 0.43
0 to 0.35
Chromium (Cr), % 0.7 to 0.9
27 to 30
Cobalt (Co), % 0
58.7 to 68
Iron (Fe), % 97.3 to 98.1
0 to 0.75
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 0
0 to 0.2

Comparable Variants