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R30155 Cobalt vs. EN 1.7707 Steel

Both R30155 cobalt and EN 1.7707 steel are iron alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.7707 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
300
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
11
Fatigue Strength, MPa 310
500
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 570
600
Tensile Strength: Ultimate (UTS), MPa 850
1010
Tensile Strength: Yield (Proof), MPa 390
800

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
460
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
39
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
3.3
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.9
Embodied Energy, MJ/kg 150
27
Embodied Water, L/kg 300
58

Common Calculations

PREN (Pitting Resistance) 37
3.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
110
Resilience: Unit (Modulus of Resilience), kJ/m3 370
1690
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
36
Strength to Weight: Bending, points 24
29
Thermal Diffusivity, mm2/s 3.2
11
Thermal Shock Resistance, points 21
29

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.26 to 0.34
Chromium (Cr), % 20 to 22.5
2.3 to 2.7
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
94.7 to 96.8
Manganese (Mn), % 1.0 to 2.0
0.4 to 0.7
Molybdenum (Mo), % 2.5 to 3.5
0.15 to 0.25
Nickel (Ni), % 19 to 21
0 to 0.6
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.035
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0
Vanadium (V), % 0
0.1 to 0.2