17-7PH Condition RH950 sheet
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17-7PH Condition RH950 Stainless Steel Sheet: High-Strength Solution for Precision Applications
17-7PH Condition RH950 stainless steel sheet is a precipitation hardening (PH) stainless steel product that has been heat treated to the RH950 condition, achieving a combination of high tensile strength, excellent fatigue resistance, and good corrosion resistance. It is widely used in industries such as aerospace, medical devices, precision instrumentation, and spring components where both formability and long-term mechanical stability are critical.
What Is 17-7PH Stainless Steel?
17-7PH stainless steel (UNS S17700 / DIN 1.4568) is a chromium-nickel-aluminum alloy belonging to the precipitation hardening stainless steel family. Its name refers to its composition-17% chromium and 7% nickel-and its capability to be hardened through heat treatment.
The Condition RH950 is a specific heat treatment that results in a martensitic structure with high strength and hardness, ideal for demanding applications.
Key Features of 17-7PH Condition RH950 Sheet
✅ High Strength & Hardness: Tensile strength exceeding 1500 MPa and hardness around 45 HRC, significantly stronger than standard austenitic grades like 304 or 316.
✅ Good Corrosion Resistance: Performs well in mildly corrosive environments, suitable for both indoor and outdoor components.
✅ Dimensional Stability: Maintains tight tolerances even after forming and heat treating-critical in aerospace and instrumentation parts.
✅ Fatigue & Creep Resistance: Performs well under cyclic loading and moderate temperatures.
✅ Excellent Formability in Annealed Condition: Can be cold formed before aging to RH950, allowing complex component fabrication.
Typical Standards & Specifications
AMS 5529 Condition RH950 – Aerospace-grade specification for sheet and strip in RH950 condition.
ASTM A693 Type 631 – Covers precipitation-hardening stainless steel plate, sheet, and strip.
UNS S17700 / 1.4568 – Unified Numbering System and EN designation.
Chemical Composition of 17-7PH (Approximate)
| Element | Content (%) |
|---|---|
| C | ≤ 0.09 |
| Cr | 16.0 – 18.0 |
| Ni | 6.5 – 7.75 |
| Al | 0.75 – 1.50 |
| Mn | ≤ 1.0 |
| Si | ≤ 1.0 |
| P | ≤ 0.04 |
| S | ≤ 0.03 |
Mechanical Properties in RH950 Condition
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 1500 MPa |
| Yield Strength | ≥ 1310 MPa |
| Elongation | ≥ 5% |
| Hardness | ≈ HRC 45 |
| Modulus of Elasticity | ~200 GPa |
Applications of 17-7PH RH950 Stainless Steel Sheet
Because of its high strength-to-weight ratio, corrosion resistance, and stability in harsh environments, this material is used in:
✈️ Aerospace components (brackets, skins, structural reinforcements)
🩺 Medical devices and surgical instruments
🔧 Precision mechanical springs
⛽ Oil and gas instruments
⚙️ Industrial pressure diaphragms
🚀 Defense and missile systems
Why Choose 17-7PH RH950 Over Other Grades?
Compared to standard austenitic stainless steels like 304 and 316, or even 301, 17-7PH RH950 offers superior mechanical strength and temperature stability, with minimal compromise on corrosion resistance. It is ideal when tight tolerances, high fatigue strength, and hardness after forming are key performance requirements.
Need 17-7PH RH950 sheet in AMS 5529 compliance? Contact GNEE for custom sizes, MTC documentation, and global delivery support.
