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EN 1.4971 Stainless Steel vs. R30816 Cobalt

EN 1.4971 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have 70% of their average alloy composition in common. There are 26 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 1.4971 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
280
Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 34
23
Fatigue Strength, MPa 270
250
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 81
81
Tensile Strength: Ultimate (UTS), MPa 800
1020
Tensile Strength: Yield (Proof), MPa 340
460

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.1
Embodied Carbon, kg CO2/kg material 7.6
20
Embodied Energy, MJ/kg 110
320
Embodied Water, L/kg 300
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
190
Resilience: Unit (Modulus of Resilience), kJ/m3 280
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 26
31
Strength to Weight: Bending, points 23
25
Thermal Diffusivity, mm2/s 3.4
3.3
Thermal Shock Resistance, points 19
28

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.32 to 0.42
Chromium (Cr), % 20 to 22.5
19 to 21
Cobalt (Co), % 18.5 to 21
40 to 49.8
Iron (Fe), % 24.3 to 37.1
0 to 5.0
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
3.5 to 4.5
Nickel (Ni), % 19 to 21
19 to 21
Niobium (Nb), % 0.75 to 1.3
3.5 to 4.5
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 2.0 to 3.0
3.5 to 4.5