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R30155 Cobalt vs. AISI 440A Stainless Steel

Both R30155 cobalt and AISI 440A stainless steel are iron alloys. They have 49% of their average alloy composition in common. There are 29 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 R30155 cobalt and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
5.0 to 20
Fatigue Strength, MPa 310
270 to 790
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
77
Shear Strength, MPa 570
450 to 1040
Tensile Strength: Ultimate (UTS), MPa 850
730 to 1790
Tensile Strength: Yield (Proof), MPa 390
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 570
400
Maximum Temperature: Mechanical, °C 1100
760
Melting Completion (Liquidus), °C 1470
1480
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
23
Thermal Expansion, µm/m-K 14
10

Otherwise Unclassified Properties

Base Metal Price, % relative 80
9.0
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 9.7
2.2
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 300
120

Common Calculations

PREN (Pitting Resistance) 37
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
87 to 120
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
26 to 65
Strength to Weight: Bending, points 24
23 to 43
Thermal Diffusivity, mm2/s 3.2
6.2
Thermal Shock Resistance, points 21
26 to 65

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.6 to 0.75
Chromium (Cr), % 20 to 22.5
16 to 18
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
78.4 to 83.4
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0 to 0.75
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0