MakeItFrom.com
Menu (ESC)

R30021 Cobalt vs. S35315 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S35315 stainless steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R30021 cobalt and the bottom bar is S35315 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
46
Fatigue Strength, MPa 250
280
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 700
740
Tensile Strength: Yield (Proof), MPa 500
300

Thermal Properties

Latent Heat of Fusion, J/g 330
330
Melting Completion (Liquidus), °C 1350
1370
Melting Onset (Solidus), °C 1190
1330
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
5.7
Embodied Energy, MJ/kg 110
81
Embodied Water, L/kg 520
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
270
Resilience: Unit (Modulus of Resilience), kJ/m3 570
230
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
26
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 3.8
3.1
Thermal Shock Resistance, points 21
17

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.040 to 0.080
Cerium (Ce), % 0
0.030 to 0.1
Chromium (Cr), % 26 to 29
24 to 26
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
33.6 to 40.6
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
34 to 36
Nitrogen (N), % 0
0.12 to 0.18
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
1.2 to 2.0
Sulfur (S), % 0
0 to 0.030