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EN 1.4849 Stainless Steel vs. R30021 Cobalt

EN 1.4849 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is EN 1.4849 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 4.5
9.0
Fatigue Strength, MPa 120
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 480
700
Tensile Strength: Yield (Proof), MPa 250
500

Thermal Properties

Latent Heat of Fusion, J/g 320
330
Melting Completion (Liquidus), °C 1390
1350
Melting Onset (Solidus), °C 1340
1190
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 15
11

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.4
Embodied Carbon, kg CO2/kg material 7.1
8.0
Embodied Energy, MJ/kg 100
110
Embodied Water, L/kg 200
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18
57
Resilience: Unit (Modulus of Resilience), kJ/m3 160
570
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
23
Strength to Weight: Bending, points 17
21
Thermal Diffusivity, mm2/s 3.2
3.8
Thermal Shock Resistance, points 11
21

Alloy Composition

Carbon (C), % 0.3 to 0.5
0.2 to 0.35
Chromium (Cr), % 18 to 21
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 32.6 to 43.5
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.5
4.5 to 6.0
Nickel (Ni), % 36 to 39
2.0 to 3.0
Niobium (Nb), % 1.2 to 1.8
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 1.0 to 2.5
0 to 1.5
Sulfur (S), % 0 to 0.030
0