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EN 1.4818 Stainless Steel vs. R30155 Cobalt

Both EN 1.4818 stainless steel and R30155 cobalt 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 EN 1.4818 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
34
Fatigue Strength, MPa 280
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Shear Strength, MPa 480
570
Tensile Strength: Ultimate (UTS), MPa 700
850
Tensile Strength: Yield (Proof), MPa 330
390

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 420
570
Maximum Temperature: Mechanical, °C 1050
1100
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1370
1420
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 17
12
Thermal Expansion, µm/m-K 17
14

Otherwise Unclassified Properties

Base Metal Price, % relative 16
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 3.1
9.7
Embodied Energy, MJ/kg 44
150
Embodied Water, L/kg 150
300

Common Calculations

PREN (Pitting Resistance) 22
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
230
Resilience: Unit (Modulus of Resilience), kJ/m3 270
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 25
28
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.5
3.2
Thermal Shock Resistance, points 15
21

Alloy Composition

Carbon (C), % 0.040 to 0.080
0.080 to 0.16
Cerium (Ce), % 0.030 to 0.080
0
Chromium (Cr), % 18 to 20
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 65.6 to 71.8
24.3 to 36.2
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 9.0 to 11
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0.12 to 0.2
0 to 0.2
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 1.0 to 2.0
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