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R30016 Cobalt vs. ASTM A387 Grade 21L Class 1

R30016 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 21L class 1 belongs to the iron alloys. There are 27 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 R30016 cobalt and the bottom bar is ASTM A387 grade 21L class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 8.4
21
Fatigue Strength, MPa 290
160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
74
Tensile Strength: Ultimate (UTS), MPa 1010
500
Tensile Strength: Yield (Proof), MPa 580
230

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1270
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
41
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
8.8

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 7.7
1.8
Embodied Energy, MJ/kg 110
23
Embodied Water, L/kg 500
62

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
84
Resilience: Unit (Modulus of Resilience), kJ/m3 770
140
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
18
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 3.9
11
Thermal Shock Resistance, points 24
14

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.1
Chromium (Cr), % 28 to 32
2.8 to 3.3
Cobalt (Co), % 49.6 to 66.9
0
Iron (Fe), % 0 to 3.0
94.4 to 96.1
Manganese (Mn), % 0.5 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0 to 1.5
0.9 to 1.1
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0.2 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 3.5 to 5.5
0