Stainless 17-4 PH®
17-4 PH® is a martensitic precipitation hardening stainless steel offering high strength and hardness along with moderate corrosion resistance up to 600˚F. It has good fabrication characteristics and can be age hardened using a single heat treatment in the 900-1150˚F temperature range. This grade has been used for a variety of oil field and chemical process equipment, as well as fittings and fasteners.
In addition to its strength and corrosion resistance, 17-4 PH® is valued for its excellent dimensional stability, allowing it to maintain roundness and size through heat treatment and machining processes. This stability makes it a reliable choice for precision components where tight tolerances are required. The alloy’s ability to achieve high strength in combination with consistent geometry has led to its widespread use in applications such as pump shafts, mechanical seals, oilfield equipment, and aerospace components, where both performance and repeatability are critical.
17-4 PH® is available in a range of heat-treated conditions, allowing properties to be tailored to specific application requirements. Higher strength conditions provide increased hardness for wear resistance, while lower strength conditions offer improved toughness and resistance to stress corrosion cracking. This versatility gives engineers flexibility in balancing strength, toughness, corrosion resistance, and machinability, making 17-4 PH® a dependable solution across a variety of demanding environments.
Choosing the Right Material for Your Application
Read our blog: 17-4 PH® Stainless Steel – Strength, Stability, and Stock You Can Count On
Available Products
Stainless 17-4 PH Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A693 (Type 630)*
| Carbon | 0.07 | Silicon | 1.00 |
| Chromium | 15.0-17.5 | Phosphorus | 0.040 |
| Nickel | 3.0-5.0 | Sulfur | 0.030 |
| Copper | 3.0-5.0 | Columbium + Tantalum | 0.15-0.45 |
| Manganese | 1.00 |
*Maximum, unless range is indicated
Stainless 17-4 PH Physical Properties
| Density, lb/in3 | 0.280 |
| Modulus of Elasticity, psi | 28.5 x 106 |
| Coefficient of Thermal Expansion, 68-212˚F, /˚F | 6.0 x 10-6 |
| Thermal Conductivity, Btu/ft hr ˚F | 10.6 |
| Specific Heat, Btu/lb ˚F | 0.11 |
| Electrical Resistivity, Microhm-in | 38.6 |
Stainless 17-4 PH Mechanical Properties
Mechanical property requirements for solution treated product (Condition A) as specified in ASTM A693.
| Yield Strength, min. (ksi) | - |
| Tensile Strength, min. (ksi) | - |
| Elongation, min. (%) | - |
| Hardness, max. (HBW) | 38 |
Stainless 17-4 PH Standards
Typical standards for 17-4 PH stainless steel
| ASTM A693 (listed as Grade 630) |
| AMS 5604 |
Your Source for Stainless 17-4 PH
At Double Eagle Alloys, we supply Stainless 17-4 PH in long bar engineered for these demanding services. Contact our team to learn how 17-4 PH can support long-term performance and reliability.
Questions? We’d love to help. Contact us today to discuss your needs or to check current availability.
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Data shown are typical and provided for informational purposes only. Values should not be considered minimums or maximums for specification or final design. Actual product data may vary, and information may be revised without notice.