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R30816 Cobalt vs. AISI 348 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while AISI 348 stainless steel belongs to the iron alloys. They have a modest 34% 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 348 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
170
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
41
Fatigue Strength, MPa 250
200
Poisson's Ratio 0.3
0.28
Reduction in Area, % 22
53
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 1020
580
Tensile Strength: Yield (Proof), MPa 460
230

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Melting Completion (Liquidus), °C 1540
1430
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
3.7
Embodied Energy, MJ/kg 320
54
Embodied Water, L/kg 440
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
190
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
4.2
Thermal Shock Resistance, points 28
13

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.080
Chromium (Cr), % 19 to 21
17 to 19
Cobalt (Co), % 40 to 49.8
0 to 0.2
Iron (Fe), % 0 to 5.0
63.8 to 74
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
9.0 to 13
Niobium (Nb), % 3.5 to 4.5
0 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0 to 0.1
Tungsten (W), % 3.5 to 4.5
0