17-4 PH Steel Springs

Stainless Steel 17-4 PH is a precipitation-hardening martensitic Stainless Steel, which has corrosion resistance comparable to austenitic varieties. This makes 17-4 PH well suited for applications that require ease of fabrication with the addition of strength/hardness for improved reliability vs. 302 or 316 alloy where higher tensile strength properties are required.

This valuable combination of properties gives designers the opportunity to add reliability to their products while simplifying fabrication and often reducing costs. This material is typically utilized in Aerospace, Chemical, Petro Chemical, Food Processing Safety Valves, and other industries where corrosion or higher temperatures pose an issue for the application. 17-4 Ph has similar corrosion properties to 304 Stainless Steel.

Typical cross sections are round, rectangular or square. Coiling Technologies can produce 17-4 in a variety of sizes, from .12"5 up to 2.50” diameter. We can process material from 0.008” up to 2.50’ diameter.

17-4 PH Steel Spring Types

17-4 PH Steel Applications

17-4 PH is commonly used in a variety of industries and applications. 17-4 PH’s excellent stress corrosion resistance makes it a popular option for a wide range of applications. If high strength is required H900 condition will yield the highest tensile strength properties. 17-4 PH is most commonly used in:

  • Actuators
  • Safety relief valves
  • Hanger springs in marine applications

You are sure to find what you need here at Coiling Technologies. Contact us today if you need 17-4 PH for your application!

Technical Specification 17-4 PH
Nominal Composition

Cr: 15.0 - 17.50

Ni: 3.0 – 5.0

Cu: 3.0 – 5.0


0.28 lb./in3

Modulus of Elasticity (E)

28.5 x 106 psi

Modulus of Rigidity (G)

11.00 x 103 ksi

Coefficient of Expansion

6.0 µin/in.-°F (70°F)

Electrical Resistivity

98.0 µΩ.cm

Thermal Conductivity

124 Btu/(hr/ft2/in/°F)

Min Size

0.003 in (0.080 mm)

Max Temp

316oC (600oF)


Cold drawn & precipitation hardened after fabrication and has high strength.