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AISI 205 Stainless Steel vs. R31539 Cobalt

AISI 205 stainless steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AISI 205 stainless steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 11 to 51
13 to 22
Fatigue Strength, MPa 410 to 640
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 800 to 1430
1000 to 1340
Tensile Strength: Yield (Proof), MPa 450 to 1100
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1380
1360
Melting Onset (Solidus), °C 1340
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 18
13

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 2.6
8.2
Embodied Energy, MJ/kg 37
110
Embodied Water, L/kg 150
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 430
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 510 to 3060
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 29 to 52
33 to 44
Strength to Weight: Bending, points 25 to 37
27 to 32
Thermal Shock Resistance, points 16 to 29
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0.12 to 0.25
0 to 0.14
Chromium (Cr), % 16.5 to 18.5
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 62.6 to 68.1
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 14 to 15.5
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 1.0 to 1.7
0 to 1.0
Nitrogen (N), % 0.32 to 0.4
0 to 0.25
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0

Comparable Variants