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R30075 Cobalt vs. SAE-AISI 1038 Steel

R30075 cobalt belongs to the cobalt alloys classification, while SAE-AISI 1038 steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is SAE-AISI 1038 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Elongation at Break, % 12
14 to 20
Fatigue Strength, MPa 250 to 840
220 to 350
Poisson's Ratio 0.29
0.29
Reduction in Area, % 20
40 to 45
Shear Modulus, GPa 82 to 98
73
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
590 to 640
Tensile Strength: Yield (Proof), MPa 480 to 840
320 to 540

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
51
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 110
18
Embodied Water, L/kg 530
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
83 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
270 to 790
Stiffness to Weight: Axial, points 14 to 17
13
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
21 to 23
Strength to Weight: Bending, points 22 to 31
20 to 21
Thermal Diffusivity, mm2/s 3.5
14
Thermal Shock Resistance, points 21 to 29
19 to 20

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.35 to 0.42
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
98.6 to 99.05
Manganese (Mn), % 0 to 1.0
0.6 to 0.9
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.010
0 to 0.050
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0