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S13800 Stainless Steel vs. R30021 Cobalt

S13800 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S13800 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, % 11 to 18
9.0
Fatigue Strength, MPa 410 to 870
250
Poisson's Ratio 0.28
0.29
Rockwell C Hardness 30 to 51
32
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 980 to 1730
700
Tensile Strength: Yield (Proof), MPa 660 to 1580
500

Thermal Properties

Latent Heat of Fusion, J/g 280
330
Melting Completion (Liquidus), °C 1450
1350
Melting Onset (Solidus), °C 1410
1190
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
1.9
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
8.0
Embodied Energy, MJ/kg 46
110
Embodied Water, L/kg 140
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 190
57
Resilience: Unit (Modulus of Resilience), kJ/m3 1090 to 5490
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 35 to 61
23
Strength to Weight: Bending, points 28 to 41
21
Thermal Diffusivity, mm2/s 4.3
3.8
Thermal Shock Resistance, points 33 to 58
21

Alloy Composition

Aluminum (Al), % 0.9 to 1.4
0
Carbon (C), % 0 to 0.050
0.2 to 0.35
Chromium (Cr), % 12.3 to 13.2
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 73.6 to 77.3
0 to 3.0
Manganese (Mn), % 0 to 0.2
0
Molybdenum (Mo), % 2.0 to 3.0
4.5 to 6.0
Nickel (Ni), % 7.5 to 8.5
2.0 to 3.0
Nitrogen (N), % 0 to 0.010
0
Phosphorus (P), % 0 to 0.010
0
Silicon (Si), % 0 to 0.1
0 to 1.5
Sulfur (S), % 0 to 0.0080
0