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AISI 439 Stainless Steel vs. R30605 Cobalt

AISI 439 stainless steel belongs to the iron alloys classification, while R30605 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 25 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is AISI 439 stainless steel and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 23
34
Fatigue Strength, MPa 170
260 to 590
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 490
1130 to 1900
Tensile Strength: Yield (Proof), MPa 250
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1510
1410
Melting Onset (Solidus), °C 1430
1330
Specific Heat Capacity, J/kg-K 480
410
Thermal Conductivity, W/m-K 25
9.6
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.6
Embodied Carbon, kg CO2/kg material 2.3
9.8
Embodied Energy, MJ/kg 34
140
Embodied Water, L/kg 120
450

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 18
33 to 55
Strength to Weight: Bending, points 18
25 to 36
Thermal Diffusivity, mm2/s 6.7
2.5
Thermal Shock Resistance, points 16
31 to 52

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0.050 to 0.15
Chromium (Cr), % 17 to 19
19 to 21
Cobalt (Co), % 0
46.4 to 57
Iron (Fe), % 77.1 to 82.8
0 to 3.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Nickel (Ni), % 0 to 0.5
9.0 to 11
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0.2 to 1.1
0
Tungsten (W), % 0
14 to 16