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R30155 Cobalt vs. AISI 431 Stainless Steel

Both R30155 cobalt and AISI 431 stainless steel are iron alloys. They have 49% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
250
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
15 to 17
Fatigue Strength, MPa 310
430 to 610
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
77
Shear Strength, MPa 570
550 to 840
Tensile Strength: Ultimate (UTS), MPa 850
890 to 1380
Tensile Strength: Yield (Proof), MPa 390
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 570
400
Maximum Temperature: Mechanical, °C 1100
850
Melting Completion (Liquidus), °C 1470
1510
Melting Onset (Solidus), °C 1420
1450
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
26
Thermal Expansion, µm/m-K 14
12

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
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 370
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
32 to 50
Strength to Weight: Bending, points 24
27 to 36
Thermal Diffusivity, mm2/s 3.2
7.0
Thermal Shock Resistance, points 21
28 to 43

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.2
Chromium (Cr), % 20 to 22.5
15 to 17
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
78.2 to 83.8
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
1.3 to 2.5
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 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0