17-4 PH Specifications | |
Institute | Standard |
UNS | S17400 |
W. Nr./EN | 1.4548 |
ASTM | A693, A564, A705, Type 630 |
AMS | 5604, 5643, 5825 |
ASME | SA693, SA564, SA705, Type 630 |
NACE | MR0175 |
ISO | 15156-3 |
PH 17-4, also known as 17-4 precipitation hardening stainless steel, is a high-strength, corrosion-resistant alloy widely utilized in the manufacture of high-performance fasteners. Renowned for its exceptional mechanical properties—including high tensile strength, hardness, and excellent fatigue resistance—PH 17-4 is especially well-suited for critical fastening applications in aerospace, marine, and industrial environments. Its ability to maintain strength and dimensional stability in demanding conditions makes it a top choice for engineers seeking reliable performance.
If you’re sourcing premium-grade fasteners made from PH 17-4 stainless steel, contact Nickel Systems today to request a customized quotation tailored to your specifications.
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Get our technical data and information for 17-4 PH. If you questions are not answered, download the 17-4 PH Technical Data Sheet here.
17-4 PH Specifications | |
Institute | Standard |
UNS | S17400 |
W. Nr./EN | 1.4548 |
ASTM | A693, A564, A705, Type 630 |
AMS | 5604, 5643, 5825 |
ASME | SA693, SA564, SA705, Type 630 |
NACE | MR0175 |
ISO | 15156-3 |
17-4 PH Chemical Composition | ||
Element | Percent Composition | Description |
Nickel (Ni) | 3.0-5.0% | Range |
Chromium (Cr) | 15.0-17.0% | Range |
Copper (Cu) | 3.0-5.0% | Range |
Molybdenum (Mo) | 0.50% | Max |
Manganese (Mn) | 1.0% | Max |
Silicon (Si) | 1.0% | Max |
Niobium+Tantalum (Cb+Ta) | 0.45% | Max |
Carbon (C) | 0.07% | Max |
Phosphorus (P) | 0.04% | Max |
Iron (Fe) | ~ 72.66% | Balance |
17-4 PH Physical Properties | ||
Property | Value | Units |
Density | 0.282 | lb/in³ |
Melting Range | 2560-2625 | ℉ |
Poisson's Ratio | 0.272 | |
Electrical Resistivity | 463 | Ohm-circ mil/ft |
17-4 PH High Temperature Physical Properties | ||||
Temperature, ℉ | 70 | 212 | 392 | 572 |
Coefficient of Thermal Expansion, in/in℉ x 10^(-6) | - | 7.2 | 7.5 | 7.8 |
Thermal Conductivity, Btu●ft/ft²●hr●℉ | 8.6 | 9.2 | 9.8 | 10.4 |
Modulus of Elasticity Dynamic, psi x10^(6) | 29.0 | 28.1 | 27.0 | 26.1 |
17-4 PH Mechanical Properties | ||||||
0.2% Yield Strength, ksi | Ultimate Tensile Strength, ksi | % Elongation | Reduction in Area, % | Hardness, Brinell Rockwell | Impact Charpy V-Notch, ft-lbs | |
H900 | 185 | 200 | 14 | 50 | 420 / C 44 | 15 |
H925 | 175 | 190 | 14 | 54 | 409 / C 42 | 25 |
H1025 | 165 | 170 | 15 | 56 | 352 / C 38 | 35 |
H1075 | 150 | 165 | 16 | 58 | 341 / C 36 | 40 |
H1100 | 135 | 150 | 17 | 58 | 332 / C 35 | 45 |
H1150 | 125 | 145 | 19 | 60 | 311 / C 33 | 50 |
H1150D | 120 | 140 | 22 | 65 | 294 / C 31 | 55 |
H1150-M | 85 | 125 | 22 | 68 | 277 / C 27 | 100 |
17-4 PH Heat Treatment Processes | |
Type | Processing |
H900 | Condition A material is heated at 900℉ +/- 25℉ for 1/2 hour, air (Solution Treated) cooled or oil quenched to below 90℉. This is normally performed at the mill. |
H925, H1025, H1075, H1100, H1150 | Condition A material is heated 4 hours at 1150℉ +/- 15℉ for 1 hour and air cooled. Maximum hardness but low toughness. Sensitive to stress corrosion cracking. Heating 4 hours improves toughness while decreasing the tensile and yield strengths by about 4ksi. |
H1150D | Condition A material heated 4 hours at 1150℉, air cooled, heated again for an additional 4 hours at 1150℉ and air cooled |
H1150-M | Condition A material heated at 1400℉ +/- 25℉ for 2 hours, air cooled, then heated at 1150℉ +/- 15℉ for 4 hours and air cooled |
17-4 PH, also known as PH 17-4 or UNS S17400, is a precipitation-hardening martensitic stainless steel that combines high strength, hardness, and moderate corrosion resistance. The “17-4” refers to its composition—17% chromium and 4% nickel—with small additions of copper and niobium (or columbium), which help it achieve excellent mechanical properties through heat treatment.
High Strength: Can achieve tensile strengths up to 200 ksi (1,380 MPa) depending on heat treatment (e.g., Condition H900).
Corrosion Resistance: Comparable to 304 stainless steel in many environments; suitable for mild to moderately aggressive settings.
Good Toughness: Retains impact strength and ductility in various heat-treated states.
Heat Treatable: Strength and hardness are developed by a single low-temperature aging treatment (e.g., 900–1150°F / 482–621°C).
Excellent Dimensional Stability: Minimal distortion during heat treatment makes it ideal for precision parts.
Check out our chemical composition pie chart for 17-4 PH and find out how each element impacts strength and its corrosion resistance.
17-4 PH (Precipitation Hardening) stainless steel is a martensitic stainless steel that combines high strength and hardness with moderate corrosion resistance. Its corrosion behavior is influenced by its composition and heat treatment condition.
17-4 PH exhibits moderate resistance to general corrosion in atmospheric and mildly corrosive environments. It performs between than many standard stainless steels but worse than austenitic stainless steels like 304 and 316. Chromium forms a passive chromium oxide layer and is the primary defense against uniform corrosion. Nickel also helps against certain types of acidic environments.
17-4 PH does not perform well against pitting corrosion. It is susceptible to pitting corrosion especially in chloride-containing environments. This is due to its low molybdenum content.
