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AISI 201L Stainless Steel vs. R30155 Cobalt

Both AISI 201L stainless steel and R30155 cobalt are iron alloys. They have 54% of their average alloy composition in common. There are 31 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 AISI 201L stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 320
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 22 to 46
34
Fatigue Strength, MPa 270 to 530
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Shear Strength, MPa 520 to 660
570
Tensile Strength: Ultimate (UTS), MPa 740 to 1040
850
Tensile Strength: Yield (Proof), MPa 290 to 790
390

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 410
570
Maximum Temperature: Mechanical, °C 880
1100
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1370
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 17
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.6
9.7
Embodied Energy, MJ/kg 38
150
Embodied Water, L/kg 140
300

Common Calculations

PREN (Pitting Resistance) 19
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210 to 300
230
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1570
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27 to 37
28
Strength to Weight: Bending, points 24 to 30
24
Thermal Diffusivity, mm2/s 4.0
3.2
Thermal Shock Resistance, points 16 to 23
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.080 to 0.16
Chromium (Cr), % 16 to 18
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 67.9 to 75
24.3 to 36.2
Manganese (Mn), % 5.5 to 7.5
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 3.5 to 5.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0 to 0.25
0 to 0.2
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
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