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AISI 440B Stainless Steel vs. R30012 Cobalt

AISI 440B stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 440B stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 3.0 to 18
1.0
Fatigue Strength, MPa 260 to 850
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 740 to 1930
830
Tensile Strength: Yield (Proof), MPa 430 to 1860
650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1480
1470
Melting Onset (Solidus), °C 1370
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 23
15
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 2.2
8.3
Embodied Energy, MJ/kg 31
120
Embodied Water, L/kg 120
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57 to 110
7.7
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27 to 70
26
Strength to Weight: Bending, points 24 to 45
22
Thermal Diffusivity, mm2/s 6.1
3.8
Thermal Shock Resistance, points 27 to 70
23

Alloy Composition

Carbon (C), % 0.75 to 1.0
1.4 to 2.0
Chromium (Cr), % 16 to 18
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 78.2 to 83.3
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.75
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.015
0
Tungsten (W), % 0
7.5 to 9.5