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AISI 304 Stainless Steel vs. G-CoCr28 Cobalt

AISI 304 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 39% 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 304 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 8.0 to 43
6.7
Fatigue Strength, MPa 210 to 440
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 580 to 1180
560
Tensile Strength: Yield (Proof), MPa 230 to 860
260

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Maximum Temperature: Mechanical, °C 710
1200
Melting Completion (Liquidus), °C 1450
1330
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
8.5
Thermal Expansion, µm/m-K 17
14

Otherwise Unclassified Properties

Base Metal Price, % relative 15
100
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 3.0
6.2
Embodied Energy, MJ/kg 43
84
Embodied Water, L/kg 150
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 250
31
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1870
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21 to 42
19
Strength to Weight: Bending, points 20 to 32
19
Thermal Diffusivity, mm2/s 4.2
2.2
Thermal Shock Resistance, points 12 to 25
14

Alloy Composition

Carbon (C), % 0 to 0.080
0.050 to 0.25
Chromium (Cr), % 18 to 20
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 66.5 to 74
9.7 to 24.5
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 8.0 to 10.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030