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R30816 Cobalt vs. AISI 312 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while AISI 312 stainless steel belongs to the iron alloys. They have a modest 32% 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 312 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
250
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
28
Fatigue Strength, MPa 250
370
Poisson's Ratio 0.3
0.27
Reduction in Area, % 22
56
Shear Modulus, GPa 81
80
Tensile Strength: Ultimate (UTS), MPa 1020
780
Tensile Strength: Yield (Proof), MPa 460
510

Thermal Properties

Latent Heat of Fusion, J/g 300
300
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
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.7
Embodied Carbon, kg CO2/kg material 20
3.4
Embodied Energy, MJ/kg 320
48
Embodied Water, L/kg 440
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
190
Resilience: Unit (Modulus of Resilience), kJ/m3 510
640
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
28
Strength to Weight: Bending, points 25
24
Thermal Diffusivity, mm2/s 3.3
4.3
Thermal Shock Resistance, points 28
21

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.030
Chromium (Cr), % 19 to 21
24 to 26
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
62.2 to 69.2
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
1.2 to 2.0
Nickel (Ni), % 19 to 21
5.5 to 6.5
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
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