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R30155 Cobalt vs. EN 1.7703 Steel

Both R30155 cobalt and EN 1.7703 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 1.7703 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
200 to 210
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
20
Fatigue Strength, MPa 310
320 to 340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
74
Shear Strength, MPa 570
420 to 430
Tensile Strength: Ultimate (UTS), MPa 850
670 to 690
Tensile Strength: Yield (Proof), MPa 390
460 to 500

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
460
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1420
1430
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
4.2
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
2.5
Embodied Energy, MJ/kg 150
35
Embodied Water, L/kg 300
61

Common Calculations

PREN (Pitting Resistance) 37
5.6
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 370
570 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
24
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 3.2
11
Thermal Shock Resistance, points 21
19 to 20

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.11 to 0.15
Chromium (Cr), % 20 to 22.5
2.0 to 2.5
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 24.3 to 36.2
94.6 to 96.4
Manganese (Mn), % 1.0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 2.5 to 3.5
0.9 to 1.1
Nickel (Ni), % 19 to 21
0 to 0.25
Niobium (Nb), % 0.75 to 1.3
0 to 0.070
Nitrogen (N), % 0 to 0.2
0 to 0.012
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.030
0 to 0.0050
Tantalum (Ta), % 0.75 to 1.3
0
Titanium (Ti), % 0
0 to 0.030
Tungsten (W), % 2.0 to 3.0
0
Vanadium (V), % 0
0.25 to 0.35