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S13800 Stainless Steel vs. R31539 Cobalt

S13800 stainless steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. 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 S13800 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 18
13 to 22
Fatigue Strength, MPa 410 to 870
310 to 480
Poisson's Ratio 0.28
0.29
Reduction in Area, % 39 to 62
13 to 23
Rockwell C Hardness 30 to 51
25 to 35
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 980 to 1730
1000 to 1340
Tensile Strength: Yield (Proof), MPa 660 to 1580
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 3.4
8.2
Embodied Energy, MJ/kg 46
110
Embodied Water, L/kg 140
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 190
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 1090 to 5490
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 35 to 61
33 to 44
Strength to Weight: Bending, points 28 to 41
27 to 32
Thermal Diffusivity, mm2/s 4.3
3.5
Thermal Shock Resistance, points 33 to 58
24 to 32

Alloy Composition

Aluminum (Al), % 0.9 to 1.4
0.3 to 1.0
Carbon (C), % 0 to 0.050
0 to 0.14
Chromium (Cr), % 12.3 to 13.2
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 73.6 to 77.3
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 0.2
0 to 1.0
Molybdenum (Mo), % 2.0 to 3.0
5.0 to 7.0
Nickel (Ni), % 7.5 to 8.5
0 to 1.0
Nitrogen (N), % 0 to 0.010
0 to 0.25
Phosphorus (P), % 0 to 0.010
0
Silicon (Si), % 0 to 0.1
0 to 1.0
Sulfur (S), % 0 to 0.0080
0