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AISI 317LMN Stainless Steel vs. R30021 Cobalt

AISI 317LMN stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 27% 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 (10, in this case) are not shown.

For each property being compared, the top bar is AISI 317LMN stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 45
9.0
Fatigue Strength, MPa 250
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
86
Tensile Strength: Ultimate (UTS), MPa 620
700
Tensile Strength: Yield (Proof), MPa 270
500

Thermal Properties

Latent Heat of Fusion, J/g 290
330
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1410
1190
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.4
Embodied Carbon, kg CO2/kg material 4.8
8.0
Embodied Energy, MJ/kg 65
110
Embodied Water, L/kg 170
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
57
Resilience: Unit (Modulus of Resilience), kJ/m3 180
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
23
Strength to Weight: Bending, points 20
21
Thermal Diffusivity, mm2/s 3.8
3.8
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.2 to 0.35
Chromium (Cr), % 17 to 20
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 54.4 to 65.4
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 4.0 to 5.0
4.5 to 6.0
Nickel (Ni), % 13.5 to 17.5
2.0 to 3.0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 1.5
Sulfur (S), % 0 to 0.030
0