17-4 PH is a precipitation-hardening martensitic stainless steel that combines high strength with corrosion resistance through controlled heat treatment (H900 condition represents the fully hardened state). It is widely used in aerospace, defense, and oil & gas industries where components must withstand demanding mechanical loads in corrosive or marine environments while maintaining dimensional stability. Engineers select 17-4 PH when they need a good balance of strength, toughness, and corrosion resistance in fasteners, pump shafts, valve bodies, and structural components—offering superior performance to standard austenitic stainless steels in applications requiring higher hardness and fatigue resistance.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Fracture Toughness(KIC) | 54.61 | ksi·√in | — | — | |
Hardness (Vickers)(HV) | 375 | HV | — | — | |
Poisson's Ratio(ν) | 0.2720 | - | — | — | |
Yield Strength (0.2% offset)(σy) | 169.7 | ksi | H900 | — | |
Young's Modulus(E) | 28,572.4 | ksi | — | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Thermal Conductivity(k) | 10.57 | BTU/(hr·ft·°F) | — | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.2811 | lb/in³ | — | — |