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S45500 Stainless Steel vs. R30075 Cobalt

S45500 stainless steel belongs to the iron alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is S45500 stainless steel and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210 to 250
Elongation at Break, % 3.4 to 11
12
Fatigue Strength, MPa 570 to 890
250 to 840
Poisson's Ratio 0.28
0.29
Reduction in Area, % 34 to 45
20
Shear Modulus, GPa 75
82 to 98
Tensile Strength: Ultimate (UTS), MPa 1370 to 1850
780 to 1280
Tensile Strength: Yield (Proof), MPa 1240 to 1700
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1400
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 3.8
8.1
Embodied Energy, MJ/kg 57
110
Embodied Water, L/kg 120
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 45 to 190
84 to 140
Stiffness to Weight: Axial, points 14
14 to 17
Stiffness to Weight: Bending, points 24
24 to 25
Strength to Weight: Axial, points 48 to 65
26 to 42
Strength to Weight: Bending, points 35 to 42
22 to 31
Thermal Shock Resistance, points 48 to 64
21 to 29

Alloy Composition

Aluminum (Al), % 0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0 to 0.050
0 to 0.35
Chromium (Cr), % 11 to 12.5
27 to 30
Cobalt (Co), % 0
58.7 to 68
Copper (Cu), % 1.5 to 2.5
0
Iron (Fe), % 71.5 to 79.2
0 to 0.75
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
5.0 to 7.0
Nickel (Ni), % 7.5 to 9.5
0 to 0.5
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 1.0
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 0.1
Tungsten (W), % 0
0 to 0.2

Comparable Variants