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AISI 312 Stainless Steel vs. R31539 Cobalt

AISI 312 stainless steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. They have a modest 29% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is AISI 312 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, % 28
13 to 22
Fatigue Strength, MPa 370
310 to 480
Poisson's Ratio 0.27
0.29
Reduction in Area, % 56
13 to 23
Rockwell C Hardness 27
25 to 35
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 780
1000 to 1340
Tensile Strength: Yield (Proof), MPa 510
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1430
1360
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.4
8.2
Embodied Energy, MJ/kg 48
110
Embodied Water, L/kg 170
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 640
780 to 2000
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28
33 to 44
Strength to Weight: Bending, points 24
27 to 32
Thermal Diffusivity, mm2/s 4.3
3.5
Thermal Shock Resistance, points 21
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0 to 0.030
0 to 0.14
Chromium (Cr), % 24 to 26
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 62.2 to 69.2
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 1.2 to 2.0
5.0 to 7.0
Nickel (Ni), % 5.5 to 6.5
0 to 1.0
Nitrogen (N), % 0.14 to 0.2
0 to 0.25
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0