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R30155 Cobalt vs. EN 1.4578 Stainless Steel

Both R30155 cobalt and EN 1.4578 stainless steel are iron alloys. They have 62% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.4578 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
190
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
51
Fatigue Strength, MPa 310
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
77
Shear Strength, MPa 570
400
Tensile Strength: Ultimate (UTS), MPa 850
550
Tensile Strength: Yield (Proof), MPa 390
200

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 570
410
Maximum Temperature: Mechanical, °C 1100
930
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
14
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 80
19
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
3.7
Embodied Energy, MJ/kg 150
51
Embodied Water, L/kg 300
160

Common Calculations

PREN (Pitting Resistance) 37
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
220
Resilience: Unit (Modulus of Resilience), kJ/m3 370
100
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
19
Strength to Weight: Bending, points 24
19
Thermal Diffusivity, mm2/s 3.2
3.9
Thermal Shock Resistance, points 21
12

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.040
Chromium (Cr), % 20 to 22.5
16.5 to 17.5
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
3.0 to 3.5
Iron (Fe), % 24.3 to 36.2
62.3 to 68.5
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
2.0 to 2.5
Nickel (Ni), % 19 to 21
10 to 11
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0