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S31277 Stainless Steel vs. R30003 Cobalt

S31277 stainless steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 59% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S31277 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, % 45
10 to 73
Fatigue Strength, MPa 380
320 to 560
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
83
Tensile Strength: Ultimate (UTS), MPa 860
970 to 1720
Tensile Strength: Yield (Proof), MPa 410
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1410
1440
Specific Heat Capacity, J/kg-K 460
450
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 36
95
Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 6.7
8.0
Embodied Energy, MJ/kg 90
110
Embodied Water, L/kg 220
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 410
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
32 to 57
Strength to Weight: Bending, points 25
26 to 38
Thermal Shock Resistance, points 19
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.020
0 to 0.15
Chromium (Cr), % 20.5 to 23
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0.5 to 1.5
0
Iron (Fe), % 35.5 to 46.2
10 to 20.5
Manganese (Mn), % 0 to 3.0
1.5 to 2.5
Molybdenum (Mo), % 6.5 to 8.0
6.0 to 8.0
Nickel (Ni), % 26 to 28
14 to 16
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 1.2
Sulfur (S), % 0 to 0.010
0 to 0.015