AMS 5581 Inconel 625 Seamless Aerospace Hydraulic Tubing
Certification: ISO9001:2015
Alloy category: Corrosion-resistant alloy
Substrate shape: Axis wire/Strip/Straight bar
Alloy series: Nickel-chromium-iron alloy
Implementation standard: ASTM
Application areas: Automobile, petrochemical, industrial, aerospace, energy
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
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Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of ams 5581 inconel 625 seamless aerospace hydraulic tubing in China. If you're going to wholesale high quality ams 5581 inconel 625 seamless aerospace hydraulic tubing made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
AMS 5581 Inconel 625 Seamless Aerospace Hydraulic Tubing description
Gnee Alloy Inconel 625 Seamless Aerospace Hydraulic Tubing
AMS 5581 covers seamless and welded Inconel 625 tubing intended for aerospace hydraulic and pneumatic systems. This material is a nickel-chromium-molybdenum alloy (UNS N06625)-typically composed of approximately 61% nickel, 22% chromium, 9% molybdenum, and 3.7% niobium plus tantalum-and is supplied in the annealed (solution heat-treated) condition to ensure maximum formability and structural integrity.
Its operating temperature range extends from cryogenic levels up to 982°C (1800°F); within this range, it maintains high strength, toughness, and oxidation resistance while offering resistance to severe stress corrosion and pitting.
The tubing is manufactured using a cold-drawing process to meet precise aerospace tolerances, making it suitable for high-pressure hydraulic and pneumatic fluid systems. SAE AMS 5581 imposes strict requirements regarding the chemical composition and mechanical properties of these high-stress aerospace components.
Global Aerospace-Grade Inconel 625 Tubing: Equivalent Designations
| Specification / Standard | Designation / Details |
|---|---|
| Aviation Dedicated Grade | AMS 5581 Inconel 625 |
| US Unified Numbering System | UNS N06625 |
| European Aviation Equivalent | W.Nr 2.4856 |
| Industrial Reference Standard | ASTM B444 (for reference only; not valid for aviation projects) |
Aerospace Hydraulic Tubing (Inconel 625): Export Compliance Standards
| Specification / Standard | Description |
|---|---|
| Core Material Specification | SAE AMS 5581 (sole acceptance criteria for aviation hydraulic tubing) |
| Precision Dimensional Specification | ISO 6207 (aviation precision tube tolerances) |
| Non‑Destructive Testing Standard | AMS 2650 (aviation‑grade ultrasonic testing) |
| Cleanliness Acceptance Standard | NAS 1638 Class 8 (aviation hydraulic pipeline cleanliness) |
Alloy 625 seamless pipe Specification
Inconel Alloy 625 Chemical Composition
| Alloy Element | AMS 5581 Aviation Standard (wt%) | Export Aviation Locked Value (wt%) | Aviation Acceptance Risk Description | |
|---|---|---|---|---|
|
|
Ni | ≥58.0 | 59.0 – 61.0 | Stabilizes the matrix structure, eliminating micro-deformation of piping under high-frequency pressure cycling |
| Cr | 20.0 – 23.0 | 21.0 – 22.5 | Resists corrosion from aviation hydraulic fluids and high-altitude humid salt spray | |
| Mo | 8.0 – 10.0 | 8.5 – 9.5 | Core high-pressure strengthening element; determines the pressure-bearing limit of aviation tubing | |
| Nb+Ta | 3.15 – 4.15 | 3.3 – 4.0 | Refines grain structure, significantly enhancing high-cycle fatigue life | |
| Fe | ≤5.0 | 3.0 – 4.5 | Strictly controlled iron content ensures aviation-grade non-magnetic and high-stability characteristics | |
| C | ≤0.10 | ≤0.03 | Ultra-low carbon prevents intergranular corrosion, eliminating micro-crack leakage at welds | |
| S/P | ≤0.015 | ≤0.005 | Aviation-grade ultra-low impurities, meeting zero-defect NDT requirements |
Gnee Alloy Superalloy Spectrometer Test Records
AMS 5581 Inconel 625 aerospace-grade tube room temperature mechanical properties – solution annealing
| Test Condition | Tensile Strength | 0.2% Yield Strength | Elongation | Aviation Service Adaptability Description |
|---|---|---|---|---|
| Room Temperature Aviation Baseline | ≥830 MPa | ≥415 MPa | ≥30% | Meets aviation tubing bending, flaring, and precision assembly requirements |
| Cryogenic ‑196°C Extreme Condition | ≥890 MPa | ≥440 MPa | ≥28% | No embrittlement or fracture at high‑altitude low‑temperature environments; stable performance |
| 700°C High‑Temperature Condition | ≥690 MPa | ≥320 MPa | ≥32% | Long‑term service in airborne high‑temperature oil circuits without performance degradation |
Key Specifications for Inconel 625 Aerospace Hydraulic Tubing
- Superior Pressure Resistance: Suitable for standard aerospace hydraulic system operating pressures of 21 MPa–35 MPa; withstands instantaneous pressures up to 42 MPa without bulging or leakage.
- High-Frequency Fatigue Resistance: Withstands over one million hydraulic pulse cycles without cracking or fatigue degradation; fully compatible with the dynamic operating conditions of aircraft hydraulic circuits.
- Stable Across Full Temperature Range: Operational temperature range of -196°C to 980°C, covering all scenarios from extreme high-altitude cold to high-temperature onboard environments.
- Aerospace Fluid Compatibility: Resistant to aviation hydraulic fluids, aviation fuels, and high-altitude condensation corrosion; no oxidation, flaking, or pipeline clogging.
- Precision Physical Properties: Density of 8.44 g/cm³, melting point of 1290–1350°C, and non-magnetic; lightweight design meets aircraft weight-reduction requirements.
Click to download the Inconel 625 Pipe PDF file now
Inconel 625 seamless tube's high temperature resistance and corrosion resistance
AMS 5581 Inconel 625 Seamless Aerospace Hydraulic Tubing High Temperature Mechanical Properties
| Temp (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Strength Retention (%) |
|---|---|---|---|---|
| 20 (RT) | ≥ 830 | ≥ 415 | ≥ 30 | 100% |
| 100 | ~800 | ~400 | ~32 | 96% |
| 150 | ~780 | ~390 | ~34 | 94% |
| 200 | ~760 | ~380 | ~35 | 92% |
| 300 | ~750 | ~370 | ~35 | 90% |
AMS 5581 Inconel 625 aerospace-grade seamless tube corrosion resistance
| Environment | Resistance Level | Significance for Aerospace |
|---|---|---|
| Hydraulic Fluid | Excellent | No degradation |
| Skydrol | Excellent | Resists phosphate ester attack |
| Chloride Pitting | Excellent | Resists pitting from de-icing fluids |
| Stress Corrosion Cracking | Excellent | Immune to SCC in hydraulic systems |
| High-Temperature Oxidation | Excellent to 980°C | Fire resistance |
| Salt Spray | Excellent | Corrosion resistance in marine environments |
Corrosion Resistance Rating (1-5, 5 = best)
| Environment | Inconel 625 | 316 SS |
|---|---|---|
| Hydraulic Fluid | 5 | 5 |
| Skydrol | 5 | 4 |
| Chloride SCC | 5 | 1 |
| Pitting Resistance | 5 | 2 |
AMS 5581 Inconel 625 seamless tube heat treatment
| Parameter | Specification |
|---|---|
| Condition | Solution Annealed |
| Temperature | 940 – 1040°C |
| Time | 15-30 min (thin wall) |
| Atmosphere | Controlled atmosphere (hydrogen or vacuum) for BA finish |
| Cooling | Rapid cool (water or air) |
AMS 5581 Inconel 625 Aerospace Grade Seamless Tube Size Specifications
| Parameter | Specification |
|---|---|
| Precision Outer Diameter Range | 3 mm ~ 114 mm, covering full sizes from onboard micro‑oil circuits to main hydraulic pipelines |
| Thin‑Wall Precision Wall Thickness | 0.5 mm ~ 8 mm, aviation‑specific SCH thin‑wall specifications, lightweight with high strength |
| Aviation Tolerance Standards | Outer diameter tolerance: ±0.03 mm; wall thickness tolerance: ±0.02 mm; straightness ≤ 1.67 mm/m; ovality zero deviation |
| Finished Product Process | 100% seamless precision cold‑rolled; inner and outer walls mirror‑polished; ultra‑clean pickled and degreased; no oxide scale, no burrs, no residual impurities |
| Delivery Condition | Aviation‑grade solution annealed; stress fully relieved; supports flaring, bending, and welding precision processing |
Contact us to customize Inconel 625 products to fit your project dimensions
Export Application Scenarios for AMS 5581 Inconel 625 Aerospace Hydraulic Tubing
AMS 5581 Inconel 625 aerospace hydraulic tubing is not intended for general industrial use; it is dedicated to high-end, precision, pressure-bearing hydraulic circuits in the aerospace sector, with export demand concentrated in the following areas:
- Civil Aircraft Hydraulic Systems: Flight control hydraulic lines, high-pressure landing gear lines, and onboard auxiliary pressure transmission lines
- Military Aircraft Components: High-frequency pulse hydraulic lines, high-temperature fuel delivery lines, and precision onboard pressure-bearing tubing assemblies
- Aerospace Equipment: Spacecraft auxiliary hydraulic systems, pressure lines for high-altitude testing equipment, and hydraulic circuits for precision aviation instruments
- High-end Aviation Retrofitting and MRO: Replacement tubing for overseas aircraft maintenance and export projects supporting the localization of aviation components
AMS 5581 Inconel 625 Non-destructive Testing (NDT) for Seamless Tubes
| Test Method | Requirement | Standard | Acceptance Criteria |
|---|---|---|---|
| Eddy Current Testing (ET) | 100% | ASTM E426 | No relevant indications |
| Ultrasonic Testing (UT) | 100% (wall ≥ 0.5mm) | ASTM E213 | No defects exceeding 5% wall |
| Hydrostatic Test | 100% | AMS 2370 | 1.5× working pressure, no leakage |
| Helium Leak Test | As specified (critical systems) | ASTM E498 | ≤ 1 × 10⁻⁷ std cc/sec |
| Borescope Inspection | 100% (small diameters) | - | Smooth, clean ID |
| Visual Inspection | 100% (10-30x magnification) | ASTM E543 | No surface defects |
AMS 5581 Inconel 625 Value-added services
Gnee Alloy Value-added services
About Gnee Alloy
Provide the following aerospace-specific parameters to receive an accurate quote for aerospace-grade tubing, along with a complete compliance documentation package for installation:
1. Precision Tubing Dimensions: Outer diameter × wall thickness × length; tolerance requirements
2. Aerospace Operating Conditions: Installation application, working pressure, temperature range, and fluid medium
3. Processing Requirements: Mirror polishing, ultra-clean treatment, and custom bending/flaring
4. Certification Requirements: Standard aerospace 3.1 certificate / Third-party witnessed acceptance (3.2)
Aerospace-Specific Export Services: Free guidance on material selection based on operating conditions, complimentary cleanliness sampling and testing, full aerospace batch traceability, dedicated technical support for aerospace projects, and one-stop support for cross-border customs clearance documentation.
Gnee Alloy Inconel 625 certificate
Click to view our professional certificates for Inconel 625 alloy
FAQ
Q1: What are the key differences between AMS 5581 aerospace-grade Alloy 625 tubing and standard ASTM B444 Alloy 625 tubing?
A: They differ completely in terms of manufacturing processes, quality control, and intended applications. AMS 5581 is a specialized aerospace specification requiring strict control over impurities, cleanliness, fatigue performance, and tight dimensional tolerances, making it suitable for high-pressure aircraft hydraulic systems. In contrast, ASTM B444 is merely an industrial standard; it fails to meet aerospace safety acceptance criteria and is strictly prohibited for use in aerospace applications.
Q2: Can AMS 5581 tubing be used directly for aircraft hydraulic system assembly?
A: Yes. All finished products are supplied in an aerospace-compliant state, meeting all requirements for cleanliness, pressure resistance, fatigue life, and dimensions. No secondary processing is required; they are ready for immediate installation.
Q3: Can this tubing withstand the temperature fluctuations and high-frequency hydraulic pulses encountered at high altitudes?
A: It is fully capable of doing so. Thanks to its molybdenum- and niobium-strengthened matrix, the material maintains its performance without degradation across temperature extremes and withstands millions of high-frequency hydraulic pulses without fatigue failure. It is a specified material for high-altitude aerospace applications.
Q4: What aerospace-grade certification documents are available?
A: We can provide AMS 5581 compliance certificates, aerospace-grade ultrasonic testing (UT) reports, cleanliness inspection reports, mechanical fatigue test reports, and EN 10204 3.1/3.2 aerospace-grade witness certificates.
Q5: What is the delivery lead time for precision aerospace tubing?
A: Standard aerospace specifications are available from stock with a 7–12 business day lead time. Custom orders for ultra-clean, tight-tolerance precision tubing require 15–25 business days; expedited production is available for urgent aerospace maintenance and repair orders.
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