Precipitation-Hardening Stainless Steel

Stainless Steel 17-4 PH (UNS S17400)

17-4 PH is a martensitic precipitation-hardening stainless steel that combines high strength and hardness with corrosion resistance similar to 304. Its properties are set by an aging heat treatment, so the condition must be specified. Request a quote or browse all materials.

Typical Properties

Stainless Steel 17-4 PH at a glance

Property	Typical value
Density	7.78 g/cm³ (0.281 lb/in³)
UTS, H900	~1,310–1,380 MPa (190–200 ksi)
Yield, H900	~1,170–1,240 MPa (170–180 ksi)
Hardness, H900	~40–44 HRC
UTS, H1150	~930–1,000 MPa (135–145 ksi)
Hardness, H1150	~28–33 HRC
Elastic modulus	~197 GPa
Thermal conductivity	~18 W/m·K

Condition A is solution treated; H900 gives maximum strength, while H1025–H1150 trade strength for toughness and stress-corrosion resistance. Values are typical; ASTM A564 lists minimums. These are typical reference values from standard published data, not guaranteed minimums. Request material certificates in your RFQ if properties must be verified.

Advantages

Why engineers choose Stainless Steel 17-4 PH

Strength

Very high strength for a stainless steel.

Heat treatment

Low-temperature aging with minimal distortion; parts can be machined in Condition A and aged afterward.

Corrosion

Corrosion resistance comparable to 304 in many environments.

Additive

Also available as a metal 3D printing powder.

Design considerations: Magnetic; lower chloride resistance than 316; H900 has reduced toughness; condition and aging sequence must be stated on the drawing.

Applications