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AISI 347 Stainless Steel vs. R30006 Cobalt

AISI 347 stainless steel belongs to the iron alloys classification, while R30006 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 28 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 347 stainless steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34 to 46
1.0
Fatigue Strength, MPa 220 to 270
260
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 610 to 690
900
Tensile Strength: Yield (Proof), MPa 240 to 350
540

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1400
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.7

Otherwise Unclassified Properties

Calomel Potential, mV -80
-250
Density, g/cm3 7.8
8.6
Embodied Carbon, kg CO2/kg material 3.6
7.8
Embodied Energy, MJ/kg 52
110
Embodied Water, L/kg 150
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 220
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 310
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 22 to 25
29
Strength to Weight: Bending, points 20 to 22
24
Thermal Diffusivity, mm2/s 4.3
3.9
Thermal Shock Resistance, points 13 to 15
26

Alloy Composition

Carbon (C), % 0 to 0.080
0.9 to 1.4
Chromium (Cr), % 17 to 19
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Iron (Fe), % 64.1 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 13
0 to 3.0
Niobium (Nb), % 0 to 1.0
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
Tungsten (W), % 0
4.0 to 6.0