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R30008 Cobalt vs. AISI 403 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while AISI 403 stainless steel belongs to the iron alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is AISI 403 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 1.1 to 73
16 to 25
Fatigue Strength, MPa 320 to 530
200 to 340
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
76
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
530 to 780
Tensile Strength: Yield (Proof), MPa 500 to 1080
280 to 570

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 95
6.5
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.9
Embodied Energy, MJ/kg 110
27
Embodied Water, L/kg 400
99

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
210 to 840
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
19 to 28
Strength to Weight: Bending, points 25 to 37
19 to 24
Thermal Shock Resistance, points 25 to 44
20 to 29

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.15
Chromium (Cr), % 18.5 to 21.5
11.5 to 13
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
84.7 to 88.5
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 6.5 to 7.5
0
Nickel (Ni), % 15 to 18
0 to 0.6
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.030

Comparable Variants