GH4169 Alloy Seamless Tubes For Aerospace Exhaust Pipes
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
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Gnee Alloy GH4169 Aerospace Exhaust Pipe Export Markets
| Region / Market | Key Procurement Characteristics |
|---|---|
| Kazakhstan & CIS Countries (Largest procurement market for GH4169 exhaust pipes in military aviation) | Large annual framework orders for fighter jet engine exhaust pipe replacement; mandatory VIM+VAR aviation‑grade process; complete dual‑use export customs documentation required; compliance with Chile military aviation material standards. |
| India & Pakistan (Military aviation MRO) | Mix of small trial samples and annual bulk exhaust pipe orders; price‑sensitive; VIM industrial‑grade material acceptable for non‑core turbine exhaust branches. |
| Middle East (Saudi Arabia, UAE) (Civil aviation MRO) | Emergency replenishment orders for exhaust pipes; strict requirement for SGS/TUV 3.2 full‑witnessed MTC (Material Test Certificate). |
| Western Europe (Germany, France) (Civil jet OEM) | Demand for BA bright ultra‑thin GH4169 exhaust pipes; third‑party AMS aviation standard witness inspection reports required for each batch. |
| Southeast Asia (Local turbine component factories) | Rapid delivery requirements for standard exhaust pipe blanks; low MOQ (Minimum Order Quantity) supported for small‑batch processing needs. |
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GH4169 alloy seamless tubes for aerospace exhaust pipes description
GNEE GH4169 alloy seamless tubes for aerospace exhaust pipes
GH4169 (equivalent to Inconel 718) is a precipitation-hardened nickel-based superalloy. Its chemical composition is based on nickel (approx. 53%), chromium (approx. 18%), and iron, with the addition of strengthening elements such as niobium (approx. 5.3%), molybdenum, and titanium.
It maintains significant tensile and yield strengths at temperatures up to 650°C (1200°F) while exhibiting excellent resistance to exhaust oxidation and corrosive combustion by-products; it also effectively withstands the thermo-mechanical stresses and rapid thermal cycling associated with aerospace exhaust systems. Thin-walled seamless tubes (TWSTs) are manufactured using a precision multi-pass rolling process, requiring precise solution heat treatment to eliminate residual stresses and enhance formability.
Applicable Standards for GH4169 Aviation Tubing
| Standard No. | Title | Application |
|---|---|---|
| GB/T14992-2005 | Superalloy Designations | General |
| GB/T15062 | Superalloy Tubes for General Use | Seamless Tubes |
| GJB 1952A | Cold-Rolled Thin Sheets for Aviation | Sheets |
| GJB 2297A | Cold-Drawn (Rolled) Seamless Tubes for Aviation | Aerospace Tubes |
| GJB 2611A | Cold-Drawn Bars for Aviation | Bars |
| GJB 3165A | Hot-Rolled and Forged Bars for Aviation | Bars |
| GJB 3317A | Hot-Rolled Sheets for Aviation | Sheets |
| GB/T30566-2014 | GH4169 Bars, Forgings and Ring Forgings | Bars/Forgings |
Specification Of GH4169 alloy seamless tubes for aerospace exhaust pipes
| Parameter | GH4169 (GH169) |
|---|---|
| Material Type | Precipitation-hardening (γ″ + γ′ phases) Ni-Cr-Fe based wrought superalloy |
| Equivalent Grades | Inconel 718 (USA UNS N07718), NC19FeNb (France), W.Nr. 2.4668 (Germany) |
| Product Forms | Seamless tube, cold-drawn/rolled tube, bar, plate, sheet, strip, wire, forgings |
| Typical Exhaust Pipe Applications | Aero-engine exhaust pipes, combustion chamber liners, fuel lines, turbine casings, high-temperature gas ducts, afterburner components |
| Service Temperature | Long-term from -253°C to 700°C; 650°C yield strength ranks first among wrought superalloys |
| Strengthening Mechanism | Precipitation hardening (γ″ phase Ni₃Nb + γ′ phase Ni₃(Al,Ti,Nb)) + solid-solution strengthening (Mo) + grain boundary strengthening (carbides) |
| Density | 8.24 g/cm³ |
| Melting Range | 1260 – 1320°C |
| Magnetic Properties | Non-magnetic |
| Applicable Tube Standards | GB/T 15062 (General Purpose), GJB 2297A (Aviation Cold-drawn Seamless Tube), ASTM B829 |
GH4169 alloy seamless tubes for aerospace exhaust pipes Specification
Chemical Composition of GH4169 Tubing (Mass Fraction %; GNEE Aerospace Batch Specifications Are Stricter than AMS Standards)
| Element | AMS5589 Standard Min/Max | GNEE Exhaust Tube Batch Control | Low-Cost Supplier Hidden Risk |
|---|---|---|---|
| Ni | Balance 50.0~55.0 | 51.0~54.0 | Insufficient Ni reduces γ'' strengthening phase, shortens exhaust pipe creep life |
| Cr | 17.0~21.0 | 18.0~20.0 | Cr below 17 breaks high-temp anti-oxidation film inside exhaust pipeline |
| Nb+Ta | 4.75~5.50 | 4.90~5.40 | Core creep strengthening element, insufficient Nb causes exhaust tube cracking |
| Mo | 2.80~3.30 | 2.90~3.20 | Improves high-load creep stability under exhaust cyclic load |
| Ti | 0.65~1.15 | 0.70~1.05 | Matches Al to form γ' precipitates |
| Al | 0.20~0.80 | 0.30~0.70 | Optimizes high-temperature tensile property |
| Fe | Balance | 17.0~19.0 | Excess Fe weakens matrix high-temperature bearing capacity |
| C | ≤0.08 | ≤0.05 | High carbon generates grain boundary carbides triggering tube fatigue crack |
| S / P | S≤0.015, P≤0.015 | S≤0.010, P≤0.010 | Ex S/P leads to exhaust pipe TIG welding hot cracks |
| Trace B | 0.001~0.006 | 0.002~0.005 | Critical grain boundary strengthening element for exhaust creep resistance |
Mechanical Properties and Creep Data of GH4169 Tubing (Solution Treatment + Double Aging Heat Treatment)
| Test Temperature | Min Tensile Rm (MPa) | Min Yield Rp0.2 (MPa) | Min Elongation A | 100h Creep Rupture Strength | Matching Exhaust Pipe Scenario |
|---|---|---|---|---|---|
| Room Temp | ≥1241 | ≥1034 | ≥13 | - | Cold drawn exhaust tube blank processing |
| 600℃ Long Cycle Exhaust Working | ≥850 | ≥680 | ≥16 | ≥630MPa | Turbocharger medium exhaust pipeline |
| 650℃ Core Aero Exhaust Temp | ≥760 | ≥610 | ≥18 | ≥560MPa | Main jet engine exhaust main pipe |
| 700℃ Short Peak Afterburner Temp | ≥620 | ≥490 | ≥22 | ≥380MPa | Afterburner auxiliary radiant exhaust tube |
GH4169 Seamless Pipes for Aerospace Exhaust Systems: Proprietary Manufacturing Processes, Melting Grades, Surface Finishes, and Full Size Range
Classification of GH4169 Aerospace Exhaust Pipe Melting Grades
Single-melt VIM (Industrial Grade): Suitable for non-critical auxiliary turbocharger exhaust pipes; basic single-stage ultrasonic testing (UT); lower procurement cost; does not meet military aerospace supplier audit standards.
VIM+VAR (Aerospace Premium Grade – Mandatory for main engine exhaust lines): Double vacuum melting eliminates ingot segregation and internal micro-defects; comprehensive three-stage non-destructive testing (UT + ET + DP); Class A flaw detection standards; holds dual-use aerospace export qualifications recognized by military and civil jet engine OEMs.
Manufacturing Process of GH4169 Seamless Pipes for Aero-Exhaust Applications
VIM/VAR vacuum melting of GH4169 pipe billets → Multi-pass cold rolling (Pilgering) + precision cold drawing (wall thickness tolerance controlled to ±0.02mm for thin-walled pipes) → Intermediate stress-relief annealing → Standardized three-stage solution treatment + double-stage aging heat treatment → Comprehensive three-stage aerospace-grade non-destructive testing → Custom pipe-end flanging/short-radius bending (for exhaust assemblies) → Surface finishing and airworthiness-compliant packaging.
Three Standard Export Surface Treatment Processes for GH4169 Aerospace Exhaust System Seamless Tubes
| Surface Finish | Key Features / Characteristics | Typical Applications |
|---|---|---|
| BA (Bright Annealed) (Accounts for 85% of global bulk orders for aerospace exhaust pipes) | Annealed under inert hydrogen protection; no oxide scale on inner or outer surfaces; no risk of media contamination | Main engine exhaust lines |
| AP (Acid-Pickled / Matte) | Cost‑effective | Auxiliary turbocharger exhaust pipes |
| 400–600 Mesh Mirror‑Polished | Precision polished surface | Precision small‑bore exhaust manifolds and sensor exhaust sleeves |
Stock size range of GH4169 seamless pipes for aviation exhaust systems
| Parameter | Specification |
|---|---|
| Outer Diameter (OD) | Φ6 mm – 325 mm (0.24 in – 12.8 in) |
| Wall Thickness | 0.5 mm – 50 mm |
| Standard Single‑Piece Length | 6 m / 12 m; Custom‑length cutting and U‑bend forming available |
| Standard Pipe Schedules | SCH5 / SCH10 / SCH40 / SCH80 / SCH160 (per aerospace drawing specifications) |
| Tolerance | Wall thickness for thin‑walled exhaust pipes strictly controlled to aerospace‑grade ±0.02 mm |
Comprehensive Aerospace-Grade Non-Destructive Testing (NDT) Standards for Finished Exhaust Pipes
100% ultrasonic wall thickness scanning; 100% eddy current surface defect inspection; 100% penetrant testing on welded ends and formed sections
Applications of GH4169 in Aerospace Exhaust Systems
| Application | Operating Conditions / Key Features | Specific Use |
|---|---|---|
| Jet Engine Main High‑Temperature Exhaust Seamless Tube | Withstands 600–650°C long‑term cyclic exhaust thermal loads; VIM+VAR aviation‑grade process required | Core exhaust piping material for aero‑engines |
| Afterburner Auxiliary Radiant Exhaust Tube | Withstands 700°C short‑term peak temperature shocks; GH4169 thin‑wall seamless tube | Branch exhaust piping for afterburner systems |
| Turbocharger High‑Temperature Exhaust Delivery Tube | Serves in medium‑load cyclic temperature environments; widely used in civil aviation and military turbocharger supporting piping | Turbocharger exhaust delivery systems |
| Aircraft APU (Auxiliary Power Unit) Exhaust Casing | Small‑diameter GH4169 finished/polished tube | Exhaust systems for auxiliary engines |
| Aero‑Engine Thermocouple Exhaust Protection Tube | Thin‑wall precision seamless tube | Housings for exhaust temperature sensors |
GH4169 alloy seamless tubes for aerospace exhaust pipes production process
Gnee Steel provides the following heat treatments for GH4169 alloy seamless tubes for aerospace exhaust pipes: annealing, solution + aging. In addition, Gnee Steel also provides hot working and cold working, which are hot rolling and cold drawing.
uter Diameter (OD) of GH4169 alloy seamless tubes
| Outer Diameter (OD) of GH4169 alloy seamless tubes |
| Types | Out diameter | Length | Wall thickness |
|---|---|---|---|
| NB Sizes (available) | 1/8" ~ 8" | Upto 6 Meters | SCH 40 /SCH 10 /SCH 160/ SCH 5 / SCH 80 |
| GH4169 Seamless tube (as per need) | 5.00 milimeter ~ 203.02 milimeter | as per need | |
| GH4169 Welded tube (available + as per need) | 5.00 milimeter ~ 1219.02 milimeter | 1.00 ~ 15.00 milimeter |
GH4169 VS GH2132 Aero Exhaust Tube Selection Matrix
| Alloy Seamless Tube | Optimum Long-Term Temp | Core Unique Advantage | Main Defect | Suitable Exhaust Pipeline | Unit Cost Level |
|---|---|---|---|---|---|
| GH4169 (Inconel718) | ≤650℃ | Industry-leading 650℃ creep rupture strength, withstand heavy cyclic exhaust load | Higher raw material cost | Main jet engine high-load exhaust main pipe | Medium-High |
| GH2132 (A286) | ≤540℃ | Superior stress relaxation for low-load clamping pipe | Creep strength drops sharply above 540℃ | Light auxiliary turbocharger exhaust branch pipe | Medium-Low |
Core Procurement Conclusion For Aero Exhaust Design Engineers: If your exhaust pipeline runs continuously at 600–650℃ with high thermal cyclic load, GH4169 seamless tube is irreplaceable, exhaust pipe service life increased by over 2 times vs GH2132.
Contact our experts to recommend the right alloy for your project
GH4169 alloy seamless tubes for aerospace exhaust pipes Packaging
1. Packaging is crucial, especially in international shipping, where goods undergo multiple stages to reach their final destination; therefore, we place great emphasis on packaging.
2. Gnee Steel employs various packaging methods depending on the product. For example, we use multiple packaging methods...
Advantages of Gnee Alloy's Aerospace-Grade GH4169 Seamless Pipes for Exhaust Systems
stablished in 2008 with over 18 years of experience exporting aerospace superalloys; features a dedicated 9,000-square-meter seamless pipe production facility.
Equipped with US-made VIM and German-made VAR dual-vacuum melting furnaces; operates a dedicated production line for GH4169 aerospace exhaust pipes.
Features a comprehensive professional testing laboratory equipped with high-temperature creep testing furnaces, a full suite of UT/ET/DP non-destructive testing (NDT) equipment, and metal spectrometers.
Holds multiple international certifications, including ISO9001, ISO14001, ISO45001, and AS9100 aerospace quality system certification, as well as third-party aerospace qualifications from SGS and TUV.
Annual export volume exceeds 80,000 tons; supported by a professional aerospace export documentation team expert in customs clearance procedures for dual-use (military and civil) materials.
Flexible ordering policies for aerospace exhaust pipes: no strict Minimum Order Quantity (MOQ) for small-batch trial production, and locked-in preferential pricing available for large-scale annual framework contracts.
Gnee Alloy GH4169 Tube certificate
About Gnee Alloy
Please submit the following information via email to receive an accurate, aerospace-grade quote within one hour:
Precise exhaust pipe specifications: Outer diameter, wall thickness, total length, U-bend forming requirements, and surface finish (BA/AP/Polished)
Continuous exhaust operating temperature and engine application (Main exhaust / Afterburner / Turbocharger)
Melting grade requirements: Single Vacuum Induction Melting (VIM) – Industrial Grade / VIM + Vacuum Arc Remelting (VAR) – Aerospace Premium Grade
Order type: Small-batch samples / Annual volume framework order / Urgent MRO (Maintenance, Repair, and Operations) replenishment
Special certification requirements: AMS 5589 standard, SGS 3.2 certificate, export license for dual-use aerospace items
Complimentary laboratory test samples (customer covers international shipping costs only)
Receive the complete GH4169 aerospace exhaust pipe technical datasheet and a GH4169 vs. GH2132 comparison report immediately upon inquiry submission
Full support for custom services: U-bend forming, tube end flanging, and precision cut-to-length processing
FAQ
Q1 What's GH4169 equivalent grade? What's its core advantage for aero engine exhaust pipe?
A GH4169 is fully equivalent to Inconel718 UNS N07718, precipitation hardening nickel-based superalloy. Its irreplaceable core strength is ultra-high 650℃ creep rupture resistance, perfect for jet engine exhaust pipelines bearing long-term cyclic high-temperature thermal load; long-term safe exhaust service temperature ≤650℃, short peak up to 700℃, requires three-stage solution + dual aging heat treatment to reach full high-load performance.
Q2 What seamless tube sizes do you keep in aviation exhaust pipe stock? Available surface options?
A Standard OD Φ6–325mm, wall thickness 0.5–50mm, length 6/12m customizable U-bend forming; three aviation tube surfaces: BA bright (main engine exhaust), AP pickled (turbo auxiliary pipe), mirror polished (small exhaust sensor sleeves). All seamless tube only, no welded tube for core aero exhaust systems.
Q3 Difference between single VIM and VIM+VAR melting GH4169 exhaust pipe?
Single VIM Industrial Grade: For non-core turbocharger auxiliary exhaust branch pipe, basic single UT inspection, lower cost, cannot pass military aircraft supplier audit
VIM+VAR Aviation Premium Grade: Mandatory for main jet engine exhaust pipeline, eliminates segregation & microcracks, full UT+ET+DP triple NDT Class A report, complete dual-use export documents for military/civil aviation OEMs.
Q4 Which surface finish is most widely used for civil aircraft main exhaust seamless pipe?
A BA bright inert annealed tube accounts for 85% of global aero main exhaust bulk orders, no inner oxide layer to avoid exhaust medium contamination, fully meets aviation pipeline ultra-cleanliness standard.
Q5 What impurity limits do you control to prevent exhaust pipe welding & creep cracking?
A All aviation exhaust batches lock S≤0.010%, P≤0.010, precisely calibrate Nb/B core strengthening trace elements; low-cost suppliers cut Nb/B dosage leading to rapid exhaust pipe creep failure under 650℃ load. Every shipment full PMI spectral report attached.
Q6 What mechanical & creep test data will be included in aviation exhaust MTC certificate?
A All AMS standard 3.2 test reports include room temp tensile, 600/650℃ high-temperature tensile, 650℃ 100h creep rupture strength, full triple NDT flaw records, 650℃ oxidation weight gain test data for aero tender audit.
Q7 Core aerospace exhaust pipeline application scenarios of GH4169 seamless tube?
Jet engine main high-temperature exhaust pipeline (largest bulk demand)
Afterburner auxiliary radiant exhaust branch tubes
Turbocharger medium-temperature exhaust delivery pipes
Aircraft APU auxiliary exhaust sleeves
Exhaust gas thermocouple protection seamless tubes
Q8 What export certification documents can be provided for aerospace exhaust cross-border customs & supplier audit?
Free EN10204 3.1 factory MTC for all orders; optional paid SGS/TUV witnessed 3.2 AMS aviation inspection report. Additional export files: CO certificate, commercial invoice, aerospace dual-use material export license, Chile military aviation conformity document for CIS shipments. All test data archived 10 years for re-audit.
Q9 MOQ & delivery cycle for aero exhaust seamless tube orders?
No strict MOQ for small test exhaust tubes (5kg minimum support). Standard aviation stock exhaust pipe delivery 7–15 working days after deposit; custom U-bend forming/flanging processing 15–25 days; custom VIM+VAR vacuum ingot production 30–45 working days. Free test samples available (customer bear international freight).
Q10 Standard heat treatment process for GH4169 exhaust pipe, can aging be omitted?
Cannot skip two-stage aging after solution treatment, otherwise exhaust pipe loses critical creep resistance at 650℃: Solution annealing:980℃ hold 1h air cool → Primary aging 720℃ hold 8h furnace cool → Secondary aging 620℃ hold 8h air cool Only solution soft blank can be supplied for cold U-bend forming; finished load-bearing exhaust pipe must complete full three-stage heat treatment.
Q11 Suitable welding & forming processes for GH4169 aero exhaust tube?
TIG/GTAW is exclusive recommended welding process for aviation exhaust pipelines, low heat input operation required to avoid grain coarsening; U-bend cold forming supported with intermediate stress relief annealing. Our metallurgical team provides free exhaust pipe forming & welding parameter guide upon inquiry.
Q12 What seaworthy aviation-grade packaging for long-distance sea shipment of thin exhaust seamless tube?
Single pipe both ends sealed plastic anti-dust caps, internal & external anti-rust oil coating
Each tube separated anti-collision foam, whole bundle wrapped double waterproof rainproof film
Sealed fumigated solid wooden case with steel strap reinforcement We shoot full container loading photos before shipment & provide real-time global logistics tracking information.
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