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R30006 Cobalt vs. ASTM A372 Grade J Steel

R30006 cobalt belongs to the cobalt alloys classification, while ASTM A372 grade J steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is ASTM A372 grade J steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
17 to 22
Fatigue Strength, MPa 260
310 to 570
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
73
Tensile Strength: Ultimate (UTS), MPa 900
650 to 1020
Tensile Strength: Yield (Proof), MPa 540
430 to 850

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
8.4

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
1.5
Embodied Energy, MJ/kg 110
20
Embodied Water, L/kg 500
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
130 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 670
500 to 1930
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
23 to 36
Strength to Weight: Bending, points 24
21 to 29
Thermal Diffusivity, mm2/s 3.9
12
Thermal Shock Resistance, points 26
19 to 30

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.35 to 0.5
Chromium (Cr), % 27 to 32
0.8 to 1.2
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
96.7 to 97.8
Manganese (Mn), % 0
0.75 to 1.1
Molybdenum (Mo), % 0 to 1.0
0.15 to 0.25
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.010
Tungsten (W), % 4.0 to 6.0
0