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R30155 Cobalt vs. EN 1.7177 Steel

Both R30155 cobalt and EN 1.7177 steel are iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.7177 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
200 to 480
Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 850
660 to 1990

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
47
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
2.1
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.4
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 300
49

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
23 to 71
Strength to Weight: Bending, points 24
21 to 45
Thermal Diffusivity, mm2/s 3.2
13
Thermal Shock Resistance, points 21
19 to 59

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.55 to 0.65
Chromium (Cr), % 20 to 22.5
0.6 to 0.9
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
97 to 98.2
Manganese (Mn), % 1.0 to 2.0
0.7 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.025
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0