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R30008 Cobalt vs. S35135 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while S35135 stainless steel belongs to the iron alloys. They have 56% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is S35135 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 1.1 to 73
34
Fatigue Strength, MPa 320 to 530
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
79
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
590
Tensile Strength: Yield (Proof), MPa 500 to 1080
230

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1330
1380
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 95
37
Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.1
6.8
Embodied Energy, MJ/kg 110
94
Embodied Water, L/kg 400
220

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 31 to 56
20
Strength to Weight: Bending, points 25 to 37
19
Thermal Shock Resistance, points 25 to 44
13

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 18.5 to 21.5
20 to 25
Cobalt (Co), % 39 to 42
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 7.6 to 20
28.3 to 45
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 6.5 to 7.5
4.0 to 4.8
Nickel (Ni), % 15 to 18
30 to 38
Phosphorus (P), % 0 to 0.015
0 to 0.045
Silicon (Si), % 0 to 1.2
0.6 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Titanium (Ti), % 0
0.4 to 1.0