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EN 1.4525 Stainless Steel vs. R30021 Cobalt

EN 1.4525 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 EN 1.4525 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 5.6 to 13
9.0
Fatigue Strength, MPa 480 to 540
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 1030 to 1250
700
Tensile Strength: Yield (Proof), MPa 840 to 1120
500

Thermal Properties

Latent Heat of Fusion, J/g 280
330
Melting Completion (Liquidus), °C 1430
1350
Melting Onset (Solidus), °C 1390
1190
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 18
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.0
Embodied Energy, MJ/kg 39
110
Embodied Water, L/kg 130
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 68 to 130
57
Resilience: Unit (Modulus of Resilience), kJ/m3 1820 to 3230
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 36 to 45
23
Strength to Weight: Bending, points 29 to 33
21
Thermal Diffusivity, mm2/s 4.7
3.8
Thermal Shock Resistance, points 34 to 41
21

Alloy Composition

Carbon (C), % 0 to 0.070
0.2 to 0.35
Chromium (Cr), % 15 to 17
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 2.5 to 4.0
0
Iron (Fe), % 70.4 to 79
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.8
4.5 to 6.0
Nickel (Ni), % 3.5 to 5.5
2.0 to 3.0
Niobium (Nb), % 0 to 0.35
0
Nitrogen (N), % 0 to 0.050
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 0.8
0 to 1.5
Sulfur (S), % 0 to 0.025
0