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AISI 321 Stainless Steel vs. R30012 Cobalt

AISI 321 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 21% 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 (8, in this case) are not shown.

For each property being compared, the top bar is AISI 321 stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34 to 50
1.0
Fatigue Strength, MPa 220 to 270
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 590 to 690
830
Tensile Strength: Yield (Proof), MPa 220 to 350
650

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1400
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.8
Embodied Carbon, kg CO2/kg material 3.2
8.3
Embodied Energy, MJ/kg 45
120
Embodied Water, L/kg 140
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21 to 25
26
Strength to Weight: Bending, points 20 to 22
22
Thermal Diffusivity, mm2/s 4.1
3.8
Thermal Shock Resistance, points 13 to 15
23

Alloy Composition

Carbon (C), % 0 to 0.080
1.4 to 2.0
Chromium (Cr), % 17 to 19
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 65.3 to 74
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 9.0 to 12
0 to 3.0
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0 to 0.7
0
Tungsten (W), % 0
7.5 to 9.5