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EN 1.4971 Stainless Steel vs. R30003 Cobalt

EN 1.4971 stainless steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 75% 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 R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 34
10 to 73
Fatigue Strength, MPa 270
320 to 560
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
83
Tensile Strength: Ultimate (UTS), MPa 800
970 to 1720
Tensile Strength: Yield (Proof), MPa 340
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1410
1440
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 70
95
Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 7.6
8.0
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 300
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 280
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
32 to 57
Strength to Weight: Bending, points 23
26 to 38
Thermal Diffusivity, mm2/s 3.4
3.3
Thermal Shock Resistance, points 19
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0.080 to 0.16
0 to 0.15
Chromium (Cr), % 20 to 22.5
19 to 21
Cobalt (Co), % 18.5 to 21
39 to 41
Iron (Fe), % 24.3 to 37.1
10 to 20.5
Manganese (Mn), % 0 to 2.0
1.5 to 2.5
Molybdenum (Mo), % 2.5 to 3.5
6.0 to 8.0
Nickel (Ni), % 19 to 21
14 to 16
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 1.2
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 2.0 to 3.0
0