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R30006 Cobalt vs. EN 1.4938 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while EN 1.4938 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is EN 1.4938 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
16 to 17
Fatigue Strength, MPa 260
390 to 520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 900
870 to 1030
Tensile Strength: Yield (Proof), MPa 540
640 to 870

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
30
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
3.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
3.3
Embodied Energy, MJ/kg 110
47
Embodied Water, L/kg 500
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 670
1050 to 1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
31 to 37
Strength to Weight: Bending, points 24
26 to 29
Thermal Diffusivity, mm2/s 3.9
8.1
Thermal Shock Resistance, points 26
30 to 35

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.080 to 0.15
Chromium (Cr), % 27 to 32
11 to 12.5
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
80.5 to 84.8
Manganese (Mn), % 0
0.4 to 0.9
Molybdenum (Mo), % 0 to 1.0
1.5 to 2.0
Nickel (Ni), % 0 to 3.0
2.0 to 3.0
Nitrogen (N), % 0
0.020 to 0.040
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 4.0 to 6.0
0
Vanadium (V), % 0
0.25 to 0.4