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R30012 Cobalt vs. AISI 431 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while AISI 431 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
15 to 17
Fatigue Strength, MPa 320
430 to 610
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 48
26
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
890 to 1380
Tensile Strength: Yield (Proof), MPa 650
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1470
1510
Melting Onset (Solidus), °C 1280
1450
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
26
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.0

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 960
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
32 to 50
Strength to Weight: Bending, points 22
27 to 36
Thermal Diffusivity, mm2/s 3.8
7.0
Thermal Shock Resistance, points 23
28 to 43

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.2
Chromium (Cr), % 27 to 32
15 to 17
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
78.2 to 83.8
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
1.3 to 2.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0