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S35500 Stainless Steel vs. R30155 Cobalt

Both S35500 stainless steel and R30155 cobalt are iron alloys. They have 55% 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 S35500 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 14
34
Fatigue Strength, MPa 690 to 730
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
81
Shear Strength, MPa 810 to 910
570
Tensile Strength: Ultimate (UTS), MPa 1330 to 1490
850
Tensile Strength: Yield (Proof), MPa 1200 to 1280
390

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 440
570
Maximum Temperature: Mechanical, °C 870
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 16
12
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 16
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 3.5
9.7
Embodied Energy, MJ/kg 47
150
Embodied Water, L/kg 130
300

Common Calculations

PREN (Pitting Resistance) 27
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180 to 190
230
Resilience: Unit (Modulus of Resilience), kJ/m3 3610 to 4100
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 47 to 53
28
Strength to Weight: Bending, points 34 to 37
24
Thermal Diffusivity, mm2/s 4.4
3.2
Thermal Shock Resistance, points 44 to 49
21

Alloy Composition

Carbon (C), % 0.1 to 0.15
0.080 to 0.16
Chromium (Cr), % 15 to 16
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 73.2 to 77.7
24.3 to 36.2
Manganese (Mn), % 0.5 to 1.3
1.0 to 2.0
Molybdenum (Mo), % 2.5 to 3.2
2.5 to 3.5
Nickel (Ni), % 4.0 to 5.0
19 to 21
Niobium (Nb), % 0.1 to 0.5
0.75 to 1.3
Nitrogen (N), % 0.070 to 0.13
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0