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N08800 Stainless Steel vs. R30155 Cobalt

Both N08800 stainless steel and R30155 cobalt are iron alloys. They have 73% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is N08800 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 4.5 to 34
34
Fatigue Strength, MPa 150 to 390
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Shear Strength, MPa 340 to 580
570
Tensile Strength: Ultimate (UTS), MPa 500 to 1000
850
Tensile Strength: Yield (Proof), MPa 190 to 830
390

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 490
570
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1390
1470
Melting Onset (Solidus), °C 1360
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 12
12
Thermal Expansion, µm/m-K 14
14

Otherwise Unclassified Properties

Base Metal Price, % relative 30
80
Density, g/cm3 8.0
8.5
Embodied Carbon, kg CO2/kg material 5.3
9.7
Embodied Energy, MJ/kg 76
150
Embodied Water, L/kg 200
300

Common Calculations

PREN (Pitting Resistance) 21
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 42 to 160
230
Resilience: Unit (Modulus of Resilience), kJ/m3 96 to 1740
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 18 to 35
28
Strength to Weight: Bending, points 18 to 28
24
Thermal Diffusivity, mm2/s 3.0
3.2
Thermal Shock Resistance, points 13 to 25
21

Alloy Composition

Aluminum (Al), % 0.15 to 0.6
0
Carbon (C), % 0 to 0.1
0.080 to 0.16
Chromium (Cr), % 19 to 23
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 39.5 to 50.7
24.3 to 36.2
Manganese (Mn), % 0 to 1.5
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 30 to 35
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), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Titanium (Ti), % 0.15 to 0.6
0
Tungsten (W), % 0
2.0 to 3.0