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R30155 Cobalt vs. EN 1.4878 Stainless Steel

Both R30155 cobalt and EN 1.4878 stainless steel are iron alloys. They have 60% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.4878 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
180
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
45
Fatigue Strength, MPa 310
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
77
Shear Strength, MPa 570
430
Tensile Strength: Ultimate (UTS), MPa 850
610
Tensile Strength: Yield (Proof), MPa 390
210

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 570
490
Maximum Temperature: Mechanical, °C 1100
850
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 80
16
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
3.2
Embodied Energy, MJ/kg 150
46
Embodied Water, L/kg 300
140

Common Calculations

PREN (Pitting Resistance) 37
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
210
Resilience: Unit (Modulus of Resilience), kJ/m3 370
120
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
22
Strength to Weight: Bending, points 24
20
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.1
Chromium (Cr), % 20 to 22.5
17 to 19
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
65 to 74
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
9.0 to 12
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
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
Titanium (Ti), % 0
0 to 0.8
Tungsten (W), % 2.0 to 3.0
0