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R30008 Cobalt vs. SAE-AISI 1039 Steel

R30008 cobalt belongs to the cobalt alloys classification, while SAE-AISI 1039 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is SAE-AISI 1039 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 1.1 to 73
14 to 18
Fatigue Strength, MPa 320 to 530
230 to 370
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
610 to 690
Tensile Strength: Yield (Proof), MPa 500 to 1080
340 to 580

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 95
1.8
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 110
18
Embodied Water, L/kg 400
46

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
310 to 890
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 31 to 56
22 to 24
Strength to Weight: Bending, points 25 to 37
20 to 22
Thermal Shock Resistance, points 25 to 44
19 to 22

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0.37 to 0.44
Chromium (Cr), % 18.5 to 21.5
0
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
98.5 to 98.9
Manganese (Mn), % 1.0 to 2.0
0.7 to 1.0
Molybdenum (Mo), % 6.5 to 7.5
0
Nickel (Ni), % 15 to 18
0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0
Sulfur (S), % 0 to 0.015
0 to 0.050