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S31727 Stainless Steel vs. R30155 Cobalt

Both S31727 stainless steel and R30155 cobalt are iron alloys. They have 68% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
34
Fatigue Strength, MPa 240
310
Poisson's Ratio 0.28
0.29
Reduction in Area, % 56
34
Shear Modulus, GPa 78
81
Shear Strength, MPa 430
570
Tensile Strength: Ultimate (UTS), MPa 630
850
Tensile Strength: Yield (Proof), MPa 270
390

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 420
570
Maximum Temperature: Mechanical, °C 1010
1100
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 24
80
Density, g/cm3 8.0
8.5
Embodied Carbon, kg CO2/kg material 4.7
9.7
Embodied Energy, MJ/kg 64
150
Embodied Water, L/kg 180
300

Common Calculations

PREN (Pitting Resistance) 35
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
230
Resilience: Unit (Modulus of Resilience), kJ/m3 190
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 22
28
Strength to Weight: Bending, points 20
24
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.080 to 0.16
Chromium (Cr), % 17.5 to 19
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
24.3 to 36.2
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 3.8 to 4.5
2.5 to 3.5
Nickel (Ni), % 14.5 to 16.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0.15 to 0.21
0 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0