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S45500 Stainless Steel vs. R30035 Cobalt

S45500 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is S45500 stainless steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220 to 230
Elongation at Break, % 3.4 to 11
9.0 to 46
Fatigue Strength, MPa 570 to 890
170 to 740
Poisson's Ratio 0.28
0.29
Reduction in Area, % 34 to 45
40 to 74
Shear Modulus, GPa 75
84 to 89
Tensile Strength: Ultimate (UTS), MPa 1370 to 1850
900 to 1900
Tensile Strength: Yield (Proof), MPa 1240 to 1700
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1320
Specific Heat Capacity, J/kg-K 470
440
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 17
100
Density, g/cm3 7.9
8.7
Embodied Carbon, kg CO2/kg material 3.8
10
Embodied Energy, MJ/kg 57
140
Embodied Water, L/kg 120
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 45 to 190
160 to 320
Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 24
23 to 24
Strength to Weight: Axial, points 48 to 65
29 to 61
Strength to Weight: Bending, points 35 to 42
24 to 39
Thermal Shock Resistance, points 48 to 64
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.050
0 to 0.025
Chromium (Cr), % 11 to 12.5
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 1.5 to 2.5
0
Iron (Fe), % 71.5 to 79.2
0 to 1.0
Manganese (Mn), % 0 to 0.5
0 to 0.15
Molybdenum (Mo), % 0 to 0.5
9.0 to 10.5
Nickel (Ni), % 7.5 to 9.5
33 to 37
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Tantalum (Ta), % 0 to 0.5
0
Titanium (Ti), % 0.8 to 1.4
0 to 1.0

Comparable Variants