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AISI 304 Stainless Steel vs. R30035 Cobalt

AISI 304 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 29% of their average alloy composition in common, which, by itself, doesn't mean much. 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 AISI 304 stainless steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220 to 230
Elongation at Break, % 8.0 to 43
9.0 to 46
Fatigue Strength, MPa 210 to 440
170 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
84 to 89
Tensile Strength: Ultimate (UTS), MPa 580 to 1180
900 to 1900
Tensile Strength: Yield (Proof), MPa 230 to 860
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1400
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 16
11
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 15
100
Density, g/cm3 7.8
8.7
Embodied Carbon, kg CO2/kg material 3.0
10
Embodied Energy, MJ/kg 43
140
Embodied Water, L/kg 150
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 250
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1870
210 to 5920
Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 21 to 42
29 to 61
Strength to Weight: Bending, points 20 to 32
24 to 39
Thermal Diffusivity, mm2/s 4.2
3.0
Thermal Shock Resistance, points 12 to 25
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.080
0 to 0.025
Chromium (Cr), % 18 to 20
19 to 21
Cobalt (Co), % 0
29.1 to 39
Iron (Fe), % 66.5 to 74
0 to 1.0
Manganese (Mn), % 0 to 2.0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 8.0 to 10.5
33 to 37
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.015
Silicon (Si), % 0 to 0.75
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0

Comparable Variants