Custom 17-7 PH Springs

Type 17-7 PH is a Chromium-Nickel-Aluminum, austenitic stainless steel with high strength and good corrosion resistance. It is the most formable of all PH grades and has the highest strength and hardness.

Technical Specification 17-7 PH
Nominal Composition

Cr: 16.0 - 18.0

Ni: 6.5 - 7.5

Al: .75 - 1.5


0.28 lb./in3

Modulus of Elasticity (E)

29.0 x 106 psi

Modulus of Rigidity (G)

11.0 x 106 psi

Coefficient of Expansion

8.5 µin/in.-°F (70°F)

Electrical Resistivity

80.0 µΩ.cm

Thermal Conductivity

117 Btu/(hr/ft2/in/oF)

Min Size

0.003 in (0.080 mm)

Max Temp

427oC (800oF)


It is less magnetic than other PH grades and offers minimal distortion upon heat treatment