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AISI 314 Stainless Steel vs. R30155 Cobalt

Both AISI 314 stainless steel and R30155 cobalt are iron alloys. They have 73% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AISI 314 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 45
34
Fatigue Strength, MPa 210
310
Poisson's Ratio 0.28
0.29
Reduction in Area, % 57
34
Shear Modulus, GPa 78
81
Shear Strength, MPa 410
570
Tensile Strength: Ultimate (UTS), MPa 590
850
Tensile Strength: Yield (Proof), MPa 230
390

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Maximum Temperature: Corrosion, °C 440
570
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1380
1470
Melting Onset (Solidus), °C 1340
1420
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Base Metal Price, % relative 25
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 4.3
9.7
Embodied Energy, MJ/kg 62
150
Embodied Water, L/kg 190
300

Common Calculations

PREN (Pitting Resistance) 25
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
230
Resilience: Unit (Modulus of Resilience), kJ/m3 130
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21
28
Strength to Weight: Bending, points 20
24
Thermal Diffusivity, mm2/s 3.9
3.2
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0 to 0.25
0.080 to 0.16
Chromium (Cr), % 23 to 26
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 46.7 to 56.5
24.3 to 36.2
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 19 to 22
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 1.5 to 3.0
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