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R30001 Cobalt vs. ASTM A387 Grade 21L Class 1

R30001 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 21L class 1 belongs to the iron alloys. There are 23 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 R30001 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, % 1.0
21
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
74
Tensile Strength: Ultimate (UTS), MPa 620
500

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Melting Completion (Liquidus), °C 1530
1470
Melting Onset (Solidus), °C 1260
1430
Specific Heat Capacity, J/kg-K 430
470
Thermal Conductivity, W/m-K 15
41
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.8

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.9
Embodied Carbon, kg CO2/kg material 8.9
1.8
Embodied Energy, MJ/kg 130
23
Embodied Water, L/kg 460
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 3.7
11
Thermal Shock Resistance, points 19
14

Alloy Composition

Carbon (C), % 2.0 to 3.0
0 to 0.1
Chromium (Cr), % 28 to 32
2.8 to 3.3
Cobalt (Co), % 43 to 59
0
Iron (Fe), % 0 to 3.0
94.4 to 96.1
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0 to 1.0
0.9 to 1.1
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 11 to 13
0