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EN 1.4971 Stainless Steel vs. EN 2.4964 Cobalt

EN 1.4971 stainless steel belongs to the iron alloys classification, while EN 2.4964 cobalt belongs to the cobalt alloys. They have 55% of their average alloy composition in common. There are 25 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 EN 1.4971 stainless steel and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 34
40
Fatigue Strength, MPa 270
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 800
960
Tensile Strength: Yield (Proof), MPa 340
390

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Melting Completion (Liquidus), °C 1460
1630
Melting Onset (Solidus), °C 1410
1550
Specific Heat Capacity, J/kg-K 450
400
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.6
Embodied Carbon, kg CO2/kg material 7.6
9.8
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 300
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
310
Resilience: Unit (Modulus of Resilience), kJ/m3 280
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 26
28
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 3.4
3.9
Thermal Shock Resistance, points 19
25

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.050 to 0.15
Chromium (Cr), % 20 to 22.5
19 to 21
Cobalt (Co), % 18.5 to 21
46.4 to 58
Iron (Fe), % 24.3 to 37.1
0 to 3.0
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
9.0 to 11
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 2.0 to 3.0
14 to 16