Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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17-4 PH Stainless Steel Product Data Bulletin (2021)Cleveland-CliffsStainless Steel 17-4PH · Yield strength: typical, transverse, sheet/stripStainless Steel 17-4PH · Ultimate tensile strength: typical, transverse, sheet/stripStainless Steel 17-4PH · Elongation at break: typical, transverse, in 2 in. (50.8 mm)Stainless Steel 17-4PH · Young's modulus (stiffness): H 900Stainless Steel 17-4PH · Density: H 900Stainless Steel 17-4PH · Poisson's ratio: H 900 (column)Stainless Steel 17-4PH · Thermal conductivity: at 149 °C (300 °F), H 900Stainless Steel 17-4PH · Thermal expansion: mean, 21–93 °C (70–200 °F), H 900Stainless Steel 17-4PH · Specific heat: mean, 0–100 °C, H 900Stainless Steel 17-4PH · Max service temperature: strength-retention limit (not oxidation)
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TIMETAL 6-4 PropertiesTIMETarchived copyTitanium · Yield strength: typical, plate (>0.187 in), annealed, 0.2% offsetTitanium · Ultimate tensile strength: typical, plate, annealedTitanium · Elongation at break: typical, in 2 in., plate annealedTitanium · Density: nominalTitanium · Poisson's ratio: mean of TIMET measurementsTitanium · Melting point: melting rangeTitanium · Max service temperature: upper recommended use temperature
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TIMETAL 6-4 Data SheetTIMETarchived copyTitanium · Young's modulus (stiffness): typical range, 20 °CTitanium · Thermal conductivity: typical, 20 °C, mill annealedTitanium · Thermal expansion: typical, mean 0-100 °CTitanium · Specific heat: typical, 20 °C
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Is Stainless Steel 17-4PH stronger than Titanium?
Stainless Steel 17-4PH is stronger: its yield strength is 1,275 MPa against 885 MPa for Titanium (44%).
Which is lighter, Stainless Steel 17-4PH or Titanium?
Titanium is lighter: 4,430 kg/m³ against 7,800 kg/m³ for Stainless Steel 17-4PH.
Which is stiffer, Stainless Steel 17-4PH or Titanium?
Stainless Steel 17-4PH is stiffer: Young's modulus 197 GPa against 115 GPa for Titanium, so the same part in Stainless Steel 17-4PH deflects less under the same load.
Which is lighter for the same job, Stainless Steel 17-4PH or Titanium?
For the same stiffness or strength: Titanium is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Stainless Steel 17-4PH
Titanium
Stiff rod or tie (tension)
2% heavier
lighter
Stiff beam (bending)
34% heavier
lighter
Stiff panel or plate
47% heavier
lighter
Strong rod or tie
22% heavier
lighter
Strong beam
38% heavier
lighter
Strong panel or plate
47% heavier
lighter
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which is more ductile, Stainless Steel 17-4PH or Titanium?
Titanium stretches further before it breaks: 16% elongation at break against 9% for Stainless Steel 17-4PH.
Thermal
Which conducts heat better, Stainless Steel 17-4PH or Titanium?
Stainless Steel 17-4PH conducts heat better: 17.9 W/m·K against 6.6 W/m·K for Titanium.
Which expands less with temperature?
Titanium expands less: 9 µm/m·K against 10.8 µm/m·K for Stainless Steel 17-4PH.