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AISI 384 Stainless Steel vs. G-CoCr28 Cobalt

AISI 384 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is AISI 384 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 480
560

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Maximum Temperature: Mechanical, °C 910
1200
Melting Completion (Liquidus), °C 1420
1330
Melting Onset (Solidus), °C 1380
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
8.5
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 20
100
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 3.7
6.2
Embodied Energy, MJ/kg 52
84
Embodied Water, L/kg 150
440

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 4.3
2.2
Thermal Shock Resistance, points 11
14

Alloy Composition

Carbon (C), % 0 to 0.040
0.050 to 0.25
Chromium (Cr), % 15 to 17
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 60.9 to 68
9.7 to 24.5
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 17 to 19
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030