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Annealed R30075 Cobalt vs. ASTM A387 Grade 21 Class 1

Annealed R30075 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 21 class 1 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 annealed R30075 cobalt and the bottom bar is ASTM A387 grade 21 class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 12
21
Fatigue Strength, MPa 260
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 82
74
Tensile Strength: Ultimate (UTS), MPa 780
500
Tensile Strength: Yield (Proof), MPa 480
230

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
41
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
1.8
Embodied Energy, MJ/kg 110
23
Embodied Water, L/kg 530
62

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
84
Resilience: Unit (Modulus of Resilience), kJ/m3 560
140
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
18
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 3.5
11
Thermal Shock Resistance, points 21
14

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
2.8 to 3.3
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
94.4 to 96
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