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S45000 Stainless Steel vs. R31538 Cobalt

S45000 stainless steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S45000 stainless steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 6.8 to 14
13 to 23
Fatigue Strength, MPa 330 to 650
310 to 480
Poisson's Ratio 0.28
0.29
Reduction in Area, % 22 to 50
13 to 22
Rockwell C Hardness 28 to 44
25 to 35
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 980 to 1410
1020 to 1360
Tensile Strength: Yield (Proof), MPa 580 to 1310
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 17
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.1
Embodied Energy, MJ/kg 39
110
Embodied Water, L/kg 130
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 94 to 160
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 850 to 4400
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 35 to 50
34 to 45
Strength to Weight: Bending, points 28 to 36
27 to 32
Thermal Diffusivity, mm2/s 4.5
3.5
Thermal Shock Resistance, points 33 to 47
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.050
0.15 to 0.35
Chromium (Cr), % 14 to 16
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 1.3 to 1.8
0
Iron (Fe), % 72.1 to 79.3
0 to 0.75
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.5 to 1.0
5.0 to 7.0
Nickel (Ni), % 5.0 to 7.0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0

Comparable Variants