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AISI 304 Stainless Steel vs. R30605 Cobalt

AISI 304 stainless steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is AISI 304 stainless steel and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 8.0 to 43
34
Fatigue Strength, MPa 210 to 440
260 to 590
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 580 to 1180
1130 to 1900
Tensile Strength: Yield (Proof), MPa 230 to 860
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Melting Completion (Liquidus), °C 1450
1410
Melting Onset (Solidus), °C 1400
1330
Specific Heat Capacity, J/kg-K 480
410
Thermal Conductivity, W/m-K 16
9.6
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.6
Embodied Carbon, kg CO2/kg material 3.0
9.8
Embodied Energy, MJ/kg 43
140
Embodied Water, L/kg 150
450

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 21 to 42
33 to 55
Strength to Weight: Bending, points 20 to 32
25 to 36
Thermal Diffusivity, mm2/s 4.2
2.5
Thermal Shock Resistance, points 12 to 25
31 to 52

Alloy Composition

Carbon (C), % 0 to 0.080
0.050 to 0.15
Chromium (Cr), % 18 to 20
19 to 21
Cobalt (Co), % 0
46.4 to 57
Iron (Fe), % 66.5 to 74
0 to 3.0
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Nickel (Ni), % 8.0 to 10.5
9.0 to 11
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
14 to 16

Comparable Variants