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AISI 405 Stainless Steel vs. G-CoCr28 Cobalt

AISI 405 stainless steel belongs to the iron alloys classification, while G-CoCr28 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 27 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 405 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 22
6.7
Fatigue Strength, MPa 130
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 470
560
Tensile Strength: Yield (Proof), MPa 200
260

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Maximum Temperature: Mechanical, °C 820
1200
Melting Completion (Liquidus), °C 1530
1330
Melting Onset (Solidus), °C 1480
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 30
8.5
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
100
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 2.0
6.2
Embodied Energy, MJ/kg 28
84
Embodied Water, L/kg 100
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
31
Resilience: Unit (Modulus of Resilience), kJ/m3 100
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 8.1
2.2
Thermal Shock Resistance, points 16
14

Alloy Composition

Aluminum (Al), % 0.1 to 0.3
0
Carbon (C), % 0 to 0.080
0.050 to 0.25
Chromium (Cr), % 11.5 to 14.5
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 82.5 to 88.4
9.7 to 24.5
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.6
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.040
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