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EN 1.3549 Stainless Steel vs. R30816 Cobalt

EN 1.3549 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is EN 1.3549 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 730
1020

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1430
1540
Melting Onset (Solidus), °C 1390
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 21
13
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.1
Embodied Carbon, kg CO2/kg material 2.6
20
Embodied Energy, MJ/kg 37
320
Embodied Water, L/kg 130
440

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 27
31
Strength to Weight: Bending, points 24
25
Thermal Diffusivity, mm2/s 5.6
3.3
Thermal Shock Resistance, points 26
28

Alloy Composition

Carbon (C), % 0.85 to 1.0
0.32 to 0.42
Chromium (Cr), % 17 to 19
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 77.5 to 82
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0.9 to 1.3
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Vanadium (V), % 0.070 to 0.12
0