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EN 1.7366 Steel vs. R30155 Cobalt

Both EN 1.7366 steel and R30155 cobalt are iron alloys. They have a modest 37% 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 EN 1.7366 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 210
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 17 to 19
34
Fatigue Strength, MPa 160 to 320
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
81
Shear Strength, MPa 290 to 440
570
Tensile Strength: Ultimate (UTS), MPa 460 to 710
850
Tensile Strength: Yield (Proof), MPa 230 to 480
390

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 510
1100
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 4.3
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.7
9.7
Embodied Energy, MJ/kg 23
150
Embodied Water, L/kg 69
300

Common Calculations

PREN (Pitting Resistance) 6.8
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 110
230
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 600
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 16 to 25
28
Strength to Weight: Bending, points 17 to 23
24
Thermal Diffusivity, mm2/s 11
3.2
Thermal Shock Resistance, points 13 to 20
21

Alloy Composition

Carbon (C), % 0 to 0.18
0.080 to 0.16
Chromium (Cr), % 4.0 to 6.0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 91.9 to 95.3
24.3 to 36.2
Manganese (Mn), % 0.3 to 0.8
1.0 to 2.0
Molybdenum (Mo), % 0.45 to 0.65
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0