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AISI 301LN Stainless Steel vs. R30816 Cobalt

AISI 301LN stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AISI 301LN stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 320
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 23 to 51
23
Fatigue Strength, MPa 270 to 520
250
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 630 to 1060
1020
Tensile Strength: Yield (Proof), MPa 270 to 770
460

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1430
1540
Melting Onset (Solidus), °C 1380
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 2.7
20
Embodied Energy, MJ/kg 39
320
Embodied Water, L/kg 130
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220 to 290
190
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 1520
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 22 to 38
31
Strength to Weight: Bending, points 21 to 30
25
Thermal Diffusivity, mm2/s 4.0
3.3
Thermal Shock Resistance, points 14 to 24
28

Alloy Composition

Carbon (C), % 0 to 0.030
0.32 to 0.42
Chromium (Cr), % 16 to 18
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 70.7 to 77.9
0 to 5.0
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 6.0 to 8.0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0.070 to 0.2
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5