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EN 1.4938 Stainless Steel vs. R30021 Cobalt

EN 1.4938 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.4938 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 16 to 17
9.0
Fatigue Strength, MPa 390 to 520
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
700
Tensile Strength: Yield (Proof), MPa 640 to 870
500

Thermal Properties

Latent Heat of Fusion, J/g 270
330
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1420
1190
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 30
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.3
8.0
Embodied Energy, MJ/kg 47
110
Embodied Water, L/kg 110
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
57
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31 to 37
23
Strength to Weight: Bending, points 26 to 29
21
Thermal Diffusivity, mm2/s 8.1
3.8
Thermal Shock Resistance, points 30 to 35
21

Alloy Composition

Carbon (C), % 0.080 to 0.15
0.2 to 0.35
Chromium (Cr), % 11 to 12.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 80.5 to 84.8
0 to 3.0
Manganese (Mn), % 0.4 to 0.9
0
Molybdenum (Mo), % 1.5 to 2.0
4.5 to 6.0
Nickel (Ni), % 2.0 to 3.0
2.0 to 3.0
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 1.5
Sulfur (S), % 0 to 0.015
0
Vanadium (V), % 0.25 to 0.4
0