15-5 PH


Stainless steel 15-5 PH is a modification of 17-4 PH developed in the 1960s. It has a more refined microstructure obtained through the remelting process. This refined structure improves toughness of the material. 15-5PH also has low temperature hardening, good fabrication properties and excellent corrosion resistance, which makes it suitable for many industries. It can be machined in the solution-annealed state or in final heat treat condition. The strength and ductility of 15-5PH can be enhanced through heating the material at different temperatures.
15-5PH is a martensitic precipitation hardening type stainless steel. Martensitic stainless steels were designed to be corrosion resistant and hardened through heat treatment.

Chemical Composition

FeCrNiCuMnSiCPSNb + Ta

Physical Properties

  • Melting Point: 2560 – 2625°F (1404 – 1440°C)
  • Density: 0.282 lbs/in3 / 7.78 g/cm3
  • Modulus of Elasticity in Tension: 28.5 X 106 psi / 196 GPa


The following are some of the major applications of Grade 15-5 PH stainless steel:

  1. Marine gas turbine compressor sections
  2. Hallow shafts
  3. Paper mill equipment
  4. Engine parts
  5. Aircraft components
  6. Gears
  7. Fittings and fasteners
  8. Nuclear reactor components
ConditionTensileYield 0.2% offsetElongation (%in 2")Reduction of AreaBrinell HardnessRockwell Hardness
Ann363 BhnC33
H900190,000 psi170,000 psi6%15%388 BhnC40
H1025155,000 psi145,000 psi8%27%331 BhnC35
H1075145,000 psi125,000 psi9%28%311 BhnC32
H1150135,000 psi105,000 psi11%30%277 BhnC28
H1150-M115,000 psi75,000 psi14%35%255 BhnC25