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AISI 431 Stainless Steel vs. R30003 Cobalt

AISI 431 stainless steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have a modest 34% 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 (7, in this case) are not shown.

For each property being compared, the top bar is AISI 431 stainless steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 15 to 17
10 to 73
Fatigue Strength, MPa 430 to 610
320 to 560
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
970 to 1720
Tensile Strength: Yield (Proof), MPa 710 to 1040
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Melting Completion (Liquidus), °C 1510
1400
Melting Onset (Solidus), °C 1450
1440
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 26
13
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
95
Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.2
8.0
Embodied Energy, MJ/kg 31
110
Embodied Water, L/kg 120
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 50
32 to 57
Strength to Weight: Bending, points 27 to 36
26 to 38
Thermal Diffusivity, mm2/s 7.0
3.3
Thermal Shock Resistance, points 28 to 43
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.2
0 to 0.15
Chromium (Cr), % 15 to 17
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 78.2 to 83.8
10 to 20.5
Manganese (Mn), % 0 to 1.0
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 1.3 to 2.5
14 to 16
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015