Stainless 17-4PH vs. Titanium Ti-6Al-4V

Compare Stainless 17-4PH vs. Titanium Ti-6Al-4V strength, stiffness, weight and thermal properties.

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Mechanical
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Yield strength	1,275MPasourcetypical, transverse, sheet/strip	885MPasourcetypical, plate (>0.187 in), annealed, 0.2% offset
Ultimate tensile strength	1,379MPasourcetypical, transverse, sheet/strip	940MPasourcetypical, plate, annealed
Elongation at break	9%sourcetypical, transverse, in 2 in. (50.8 mm)	16%sourcetypical, in 2 in., plate annealed
Young's modulus (stiffness)	197GPasourceH 900	107–122GPasourcetypical range, 20 °C
Density	7,800kg/m³sourceH 900	4,430kg/m³sourcenominal
Strength to weight	163kN·m/kg	200kN·m/kg22% higher
Stiffness to weight	25.3MN·m/kg	25.8MN·m/kg2% higher
Poisson's ratio	0.272sourceH 900 (column)	0.342sourcemean of TIMET measurements
Shear modulus	77.4GPa1.82x stiffer in shear	42.7GPa
Bulk modulus	144GPa	121GPa
Speed of sound	5,026m/s	5,084m/s
Thermal
Thermal conductivity	17.9W/m·Ksourceat 149 °C (300 °F), H 900	6.6W/m·Ksourcetypical, 20 °C, mill annealed
Thermal expansion	10.8µm/m·Ksourcemean, 21–93 °C (70–200 °F), H 900	9µm/m·Ksourcetypical, mean 0-100 °C
100 mm part over a 50 °C swing	54µm growth	45µm growth20% less
Specific heat	460J/kg·Ksourcemean, 0–100 °C, H 900	580J/kg·Ksourcetypical, 20 °C
Heats up and cools (diffusivity)	4.99mm²/s1.94x faster	2.57mm²/s
Thermal shock resistance	7,809W/m2.09x more resistant	3,730W/m
Melting point	not sourced	1,630–1,650°Csourcemelting range
Max service temperature	316°Csourcestrength-retention limit (not oxidation)	400°Csourceupper recommended use temperature
Values for	Cleveland-Cliffs 17-4 PH, Condition H 900, sheet/strip, transverse (Product Data Bulletin, May 2021)	TIMETAL 6-4 (Ti-6Al-4V Grade 5) annealed plate typical (TIMET properties manual) + TIMET datasheet TMC-0150 physical properties

Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.

Questions

Is Stainless 17-4PH stronger than Titanium Ti-6Al-4V?

Stainless 17-4PH is stronger: its yield strength is 1,275 MPa against 885 MPa for Titanium Ti-6Al-4V (44%).

Which is lighter, Stainless 17-4PH or Titanium Ti-6Al-4V?

Titanium Ti-6Al-4V is lighter: 4,430 kg/m³ against 7,800 kg/m³ for Stainless 17-4PH.

Which is stiffer, Stainless 17-4PH or Titanium Ti-6Al-4V?

Stainless 17-4PH is stiffer: Young's modulus 197 GPa against 115 GPa for Titanium Ti-6Al-4V, so the same part in Stainless 17-4PH deflects less under the same load.

Which is lighter for the same job, Stainless 17-4PH or Titanium Ti-6Al-4V?

For the same stiffness or strength: Titanium Ti-6Al-4V 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 17-4PH	Titanium Ti-6Al-4V
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 conducts heat better, Stainless 17-4PH or Titanium Ti-6Al-4V?

Stainless 17-4PH conducts heat better: 17.9 W/m·K against 6.6 W/m·K for Titanium Ti-6Al-4V.

Which expands less with temperature?

Titanium Ti-6Al-4V expands less: 9 µm/m·K against 10.8 µm/m·K for Stainless 17-4PH.

Among 59 materials

Stiffness against density

Strength against density