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R30075 Cobalt vs. ASTM A387 Grade 22 Steel

R30075 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 22 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is ASTM A387 grade 22 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Elongation at Break, % 12
21
Fatigue Strength, MPa 250 to 840
160 to 240
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 82 to 98
74
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
480 to 600
Tensile Strength: Yield (Proof), MPa 480 to 840
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
1.7
Embodied Energy, MJ/kg 110
23
Embodied Water, L/kg 530
58

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
85 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
140 to 320
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
17 to 21
Strength to Weight: Bending, points 22 to 31
17 to 20
Thermal Diffusivity, mm2/s 3.5
11
Thermal Shock Resistance, points 21 to 29
14 to 17

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.050 to 0.15
Chromium (Cr), % 27 to 30
2.0 to 2.5
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
95.1 to 96.8
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.9 to 1.1
Nickel (Ni), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.025
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0

Comparable Variants