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EN 1.4903 Stainless Steel vs. R30155 Cobalt

Both EN 1.4903 stainless steel and R30155 cobalt are iron alloys. They have 41% of their average alloy composition in common. 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 1.4903 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20 to 21
34
Fatigue Strength, MPa 320 to 330
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
81
Shear Strength, MPa 420
570
Tensile Strength: Ultimate (UTS), MPa 670 to 680
850
Tensile Strength: Yield (Proof), MPa 500
390

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Corrosion, °C 380
570
Maximum Temperature: Mechanical, °C 650
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 26
12
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 2.6
9.7
Embodied Energy, MJ/kg 36
150
Embodied Water, L/kg 88
300

Common Calculations

PREN (Pitting Resistance) 13
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 130
230
Resilience: Unit (Modulus of Resilience), kJ/m3 650
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24
28
Strength to Weight: Bending, points 22
24
Thermal Diffusivity, mm2/s 7.0
3.2
Thermal Shock Resistance, points 23
21

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.080 to 0.12
0.080 to 0.16
Chromium (Cr), % 8.0 to 9.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 87.1 to 90.5
24.3 to 36.2
Manganese (Mn), % 0.3 to 0.6
1.0 to 2.0
Molybdenum (Mo), % 0.85 to 1.1
2.5 to 3.5
Nickel (Ni), % 0 to 0.4
19 to 21
Niobium (Nb), % 0.060 to 0.1
0.75 to 1.3
Nitrogen (N), % 0.030 to 0.070
0 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
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
Vanadium (V), % 0.18 to 0.25
0