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R30021 Cobalt vs. S17400 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S17400 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 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 S17400 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
11 to 21
Fatigue Strength, MPa 250
380 to 670
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 32
27 to 43
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 700
910 to 1390
Tensile Strength: Yield (Proof), MPa 500
580 to 1250

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Melting Completion (Liquidus), °C 1350
1440
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.7
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 520
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 570
880 to 4060
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
32 to 49
Strength to Weight: Bending, points 21
27 to 35
Thermal Diffusivity, mm2/s 3.8
4.5
Thermal Shock Resistance, points 21
30 to 46

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.070
Chromium (Cr), % 26 to 29
15 to 17
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
3.0 to 5.0
Iron (Fe), % 0 to 3.0
70.4 to 78.9
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
3.0 to 5.0
Niobium (Nb), % 0
0.15 to 0.45
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030