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R30816 Cobalt vs. AISI 302B Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while AISI 302B stainless steel belongs to the iron alloys. They have a modest 31% 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 R30816 cobalt and the bottom bar is AISI 302B stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
190
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
45
Fatigue Strength, MPa 250
210
Poisson's Ratio 0.3
0.28
Reduction in Area, % 22
57
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1020
580
Tensile Strength: Yield (Proof), MPa 460
230

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1540
1400
Melting Onset (Solidus), °C 1460
1360
Specific Heat Capacity, J/kg-K 420
490
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.7
Embodied Carbon, kg CO2/kg material 20
3.0
Embodied Energy, MJ/kg 320
43
Embodied Water, L/kg 440
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
210
Resilience: Unit (Modulus of Resilience), kJ/m3 510
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
21
Strength to Weight: Bending, points 25
20
Thermal Diffusivity, mm2/s 3.3
4.4
Thermal Shock Resistance, points 28
13

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.15
Chromium (Cr), % 19 to 21
17 to 19
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
65.7 to 73
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
8.0 to 10
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
2.0 to 3.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0