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S17700 Stainless Steel vs. R30816 Cobalt

S17700 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 (9, in this case) are not shown.

For each property being compared, the top bar is S17700 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 430
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 1.0 to 23
23
Fatigue Strength, MPa 290 to 560
250
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 1180 to 1650
1020
Tensile Strength: Yield (Proof), MPa 430 to 1210
460

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1440
1540
Melting Onset (Solidus), °C 1400
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.1
Embodied Carbon, kg CO2/kg material 2.8
20
Embodied Energy, MJ/kg 40
320
Embodied Water, L/kg 150
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15 to 210
190
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 3750
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 42 to 59
31
Strength to Weight: Bending, points 32 to 40
25
Thermal Diffusivity, mm2/s 4.1
3.3
Thermal Shock Resistance, points 39 to 54
28

Alloy Composition

Aluminum (Al), % 0.75 to 1.5
0
Carbon (C), % 0 to 0.090
0.32 to 0.42
Chromium (Cr), % 16 to 18
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 70.5 to 76.8
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 6.5 to 7.8
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
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
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5