GH3128 High-Temperature Nickel Alloy Heat-Resistant Pipe For Aerospace Industry

 

Region / Market	Key Procurement Characteristics
Kazakhstan & CIS Countries (Largest volume procurement market for GH3128 aerospace materials)	Annual large‑frame contracts for military aero‑engine flame tube replacement; mandatory VIM+ESR (Vacuum Induction Melting + Electroslag Remelting) aviation‑grade standard; complete dual‑use aerospace export license required; products must fully comply with Chile domestic aviation material standards.
India & Pakistan	Mix of small trial orders for military aviation MRO and annual bulk contracts for sheets/pipes; price‑sensitive; industrial‑grade VIM material acceptable for non‑core engine components.
Middle East (Saudi Arabia / UAE / Saudi Arabia)	MRO emergency replenishment for high‑temperature pipelines in offshore petrochemical sector; strict SGS 3.2‑grade third‑party material test certificate (MTC) audit required.
Southeast Asia (Vietnam / Thailand)	Serving local gas turbine component processing factories; fast delivery required for bar blanks and standard pipes.
Western Europe (Germany / France)	Civil aviation OEMs require BA (Bright Annealed) surface GH3128 ultra‑thin sheets; full witnessed test reports required for each batch.

Contact us to create a tailored solution for your project

 

 

GH3128 Tube Supply Specifications

Specification	Range	Note
Seamless Tubes	Custom according to customer requirements
Welded Tubes	Custom according to customer requirements
Aerospace-Grade Capillary Tubes	OD Φ1.2mm, Wall Thickness 0.3mm	Delivered in solution-treated condition
Tube Technical Standard	GH3128 Tube Technical Agreement (Proprietary Standard)

 

 

Parameter	GH3128 (GH128)
Material Type	Ni-Cr based solid-solution strengthened wrought superalloy (W-Mo solid solution + B/Ce/Zr grain boundary strengthening)
Equivalent Grades	No direct ASTM/UNS equivalent; known as "Red Star 11"
Product Forms	Cold-rolled sheet (0.8–4.0mm), hot-rolled plate (4–14mm), seamless tube, welding tube, bar, forging, wire
Typical Heat-Resistant Tube Applications	Aero-engine combustor flame tubes, afterburner casings, adjustment plates, diffusers, gas ducts
Service Temperature	Long-term up to 950°C; excellent oxidation resistance
Strengthening Mechanism	Solid-solution strengthening (W+Mo ≈ 16%) + grain boundary strengthening (B, Ce, Zr) + minor precipitation strengthening (Al, Ti)
Density	8.81 g/cm³
Melting Range	1340 – 1390°C
Magnetic Properties	Non-magnetic
Applicable Standards	GB/T 15062 (tube), GB/T 14992, GJB 1952A, GJB 2297A, GJB 3317A

 

 

 

GH3128 Pipe Chemical Composition (Typical)

Element	Content Range (wt%)	Role / Engineering Significance
Nickel (Ni)	Balance	Matrix element - provides high-temperature stability and corrosion resistance base
Chromium (Cr)	19.0 – 22.0	Core oxidation resistance element - forms Cr₂O₃ protective oxide scale at 950°C
Tungsten (W)	7.5 – 9.0	Primary solid-solution strengthening element - enhances high-temperature strength and creep resistance
Molybdenum (Mo)	7.5 – 9.0	Primary solid-solution strengthening element - synergistic strengthening with W
Aluminum (Al)	0.40 – 0.80	Secondary strengthening - forms γ' phase; contributes to oxidation resistance
Titanium (Ti)	0.40 – 0.80	Secondary strengthening - forms carbides/nitrides; refines grain structure
Carbon (C)	≤ 0.05	Carbide former - grain boundary strengthening; strictly controlled for weldability
Iron (Fe)	≤ 2.0	Controlled impurity - limited to maintain Ni-base matrix characteristics
Boron (B)	≤ 0.005 (added)	Grain boundary strengthening element - reinforces grain boundaries
Cerium (Ce)	≤ 0.05 (added)	Grain boundary purification & oxidation resistance - improves oxide scale adhesion
Zirconium (Zr)	≤ 0.06 (added)	Grain boundary strengthening element - pins grain boundaries
Manganese (Mn)	≤ 0.50	Deoxidation
Silicon (Si)	≤ 0.80	Deoxidation
Phosphorus (P)	≤ 0.013	Strictly controlled - ensures hot workability and weldability
Sulfur (S)	≤ 0.013	Strictly controlled - ensures hot workability and weldability

PMI Testing for Gnee Alloy Nickel-Based Alloy Products

 

GH3128 Tube Mechanical & Creep Data (Solution State: 1140~1180℃ Air Cool)

Test Temperature	Min Tensile Rm (MPa)	Min Yield Rp0.2 (MPa)	Min Elongation A	100h Creep Rupture Strength	Core Matching Aviation Part
Room Temp	≥830	≥450	≥20	-	Flame tube raw blank stamping
900℃ Long Cycle	≥320	≥160	≥38	≥92MPa	Gas turbine shielding baffles
950℃ Continuous Aviation Core Temp	≥240	≥125	≥42	≥78MPa	Aero engine flame tube core material
1000℃ Short Peak	≥105	≥58	≥50	-	Intermittent afterburner operation

 

GH3128 Tube Physical Properties

Property	Value	Unit	Source
Density	8.81	g/cm³
Melting Range	1340 – 1390	°C
Thermal Conductivity (100°C)	11.3	W/(m·K)
Thermal Conductivity (900°C)	~ 23.0	W/(m·K)
Elastic Modulus (RT)	208	GPa
Electrical Resistivity (RT)	1.37	μΩ·m
CTE (20–100°C)	11.25 × 10⁻⁶	/°C
CTE (20–900°C)	16.29 × 10⁻⁶	/°C
Magnetic Properties	Non-magnetic	-

 

 

 

High-Temperature Tensile Properties (Typical)

Temperature (°C)	UTS (MPa)	Elongation δ5 (%)	Reduction of Area ψ (%)
20 (RT)	814	56	68
815	422	62	24
950	226	93	69

Oxidation Resistance (100h in Air)

Temperature (°C)	Oxidation Rate (g/(m²·h))
900	~ 0.055
1000	~ 0.236
1100	~ 0.269

Creep Rupture Performance

Temperature	Performance	Source
900°C	Excellent creep rupture strength
950°C	Good long-term creep resistance

 

 

Component	Service Temperature	Core Requirement
Combustor Flame Tube	≤ 950°C	Oxidation resistance, high plasticity, thermal fatigue resistance
Afterburner Casing	≤ 950°C	Creep rupture strength, weldability
Adjustment Plates	≤ 950°C	Oxidation resistance, stamping formability
Diffuser / Gas Duct	≤ 950°C	High-temperature strength, corrosion resistance

 

 

Alloy Grade	Max Long-Term Working Temp	Core Performance Advantage	Main Defect	Best Aviation Application	Unit Cost Level
GH3128	≤950℃	Excellent 950℃ creep + thermal cycle fatigue, superior stamping thin-wall forming	Slightly higher raw material price	Aero engine thin-wall flame tubes, cyclic afterburner parts	Medium-High
GH3044	≤900~1100℃	Ultra-high static oxidation resistance for long constant temp	Poor thermal cycle fatigue, high stamping scrap rate	Static furnace shielding plates, non-cyclic high-temp liners	High

Core Procurement Conclusion From 18-Year Aerospace Tenders: If your component is thin-wall flame tube with frequent heating-cooling cycles at 950℃, GH3128 is irreplaceable, 2.3x longer service life than GH3044 under cyclic thermal load.

Contact our experts to recommend the right alloy for your project

 

Gnee Steel provides four surface treatments for GH3128 Heat-Resistant Pipe for Aerospace Industry: pickling, mirror polishing, polishing, and sandblasting.

 

Gnee Steel provides the following heat treatments for GH3128 Nickel Alloy Heat-Resistant Pipe for Aerospace Industry: annealing, solution + aging. In addition, Gnee Steel also provides hot working and cold working, which are hot rolling and cold drawing.

 

In order to better ensure the safety of your goods, we will provide professional, environmentally friendly, convenient and efficient packaging services.

 

 

Established in 2008 with over 18 years of experience exporting aerospace superalloys; operates a 35,000-square-meter integrated production facility.

Equipped with imported US VIM and German VAR dual-vacuum melting furnaces; features a dedicated production line for aerospace-grade GH3128 alloy.

Maintains comprehensive professional testing laboratories equipped with high-temperature creep testing furnaces, spectrometers, a full suite of UT/ET/MT non-destructive testing (NDT) equipment, and oxidation testing chambers.

Holds extensive international certifications, including ISO9001, ISO14001, and ISO45001, as well as third-party aerospace qualifications from SGS and TÜV Rheinland.

Achieves an annual export volume exceeding 80,000 tons, serving markets in over 160 countries, supported by a professional team specializing in aerospace export documentation.

Offers flexible ordering policies: no strict Minimum Order Quantity (MOQ) for small-batch aerospace sample orders, and exclusive, stable pricing incentives for long-term aerospace framework contracts.

Gnee Alloy GH3128 Tube Certificate

 

 

Q1: What's the equivalent grade of GH3128? What is its maximum long-term aviation service temperature?

A: GH3128 (short code GH128) has no direct American AMS equivalent grade, follows independent Chinese aviation standard GJB1952, widely matched Chile aero engine material specifications. Long-term safe continuous aviation working temperature ≤950℃, short peak instantaneous temperature up to 1000℃. It is W-Mo dual solid solution strengthened alloy, only single solution heat treatment needed without aging, outstanding thermal cycle fatigue performance for thin-wall flame tube cyclic service parts, superior to GH3044.

 

Q2: What three core finished products can you supply for aerospace projects? What sizes are in aviation stock?

A:

GH3128 Forged & Hot Rolled Bar: Φ10~500mm, black/peeled/precision ground three surfaces

GH3128 Cold Rolled Sheet & Plate: 0.05~12mm thickness, standard width 1000/1219mm, 2B/BA/No.1/sand blast finish

GH3128 Seamless Aviation Pipe: OD10~150mm, wall 1~20mm, BA/AP/mirror polished tubing We provide one-stop laser blanking, pipe flanging custom processing per aviation drawings.

 

Q3: What's the difference between Single VIM and VIM+ESR double melting GH3128 for aerospace audit?

A:

Single VIM Industrial Grade: Suitable for non-core furnace static parts, basic UT inspection, lower unit cost, cannot pass military aviation supplier audit

VIM+ESR Aviation Premium Grade: Mandatory for aero engine flame tubes & hot-end pipelines, eliminates element segregation & microcracks, 100% UT+MT+EDP full NDT Class A flaw report, complete dual-use aerospace export permit, meets Kazakhstan/EU military aviation tender standards.

 

Q4: Which sheet surface is most popular for global aviation flame tube mass production?

A: 2B pickled annealed matte surface accounts for 78% of aviation bulk orders. It balances raw material cost and ultra-high cold stamping ductility, perfectly adapted to complex thin-wall flame tube deep drawing forming. BA bright thin sheet is used for high-cleanliness aviation sealing auxiliary parts.

 

Q5: What strict impurity limits do you control for aviation-grade GH3128 to avoid pipe welding cracks?

A: All aviation batches lock S≤0.010%, P≤0.010%, Fe≤1.2%, C≤0.03, W/Mo tolerance ±0.3%. Many low-cost suppliers raise S/P content to cut cost, causing thin seamless pipe TIG welding hot cracks and flame tube premature cyclic cracking. Every aviation shipment provides full spectral PMI test record.

 

Q6: What mandatory mechanical & creep test data will be attached to aviation MTC certificate?

A: All 3.2 aviation test reports include room temperature tensile, 900℃/950℃ high-temperature tensile, 950℃ 100h creep rupture strength, metallographic grain inspection, 100% pipe NDT flaw detection, 950℃ oxidation weight gain test data.

 

Q7: Core global aerospace & energy end applications of GH3128 pipe, sheet and bar?

Military & Civil Aviation: Engine flame tubes, afterburner casings, adjustable heat baffles, high-temperature gas seamless pipelines, engine fastener bars

Gas Turbine Power Station: 950℃ cyclic thermal shielding plates, combustion chamber support shafts, radiant heat pipes

Petrochemical Offshore Equipment: Ultra-high temperature anti-oxidation process seamless piping

Industrial Vacuum Furnace: Medium-high temperature integral lining sheets, furnace heating radiant tubes

 

Q8: What certification documents can be provided for aerospace cross-border customs & factory audit?

Free 3.1 factory MTC test certificate for all orders; optional paid SGS/TUV third-party witnessed 3.2 full inspection report. Additional export files: CO certificate, commercial invoice, packing list, dual-use aerospace material export license, Chile aviation conformity document for CIS shipments. All test data archived 10 years for re-audit.

 

Q9: MOQ policy & delivery cycle for aerospace GH3128 orders?

Free small lab test samples (customer bears international freight). No strict MOQ for aviation trial batches (5kg+ acceptable). Standard aviation stock bar/sheet/pipe delivery 7-15 working days after deposit; custom laser cutting/pipe flanging processing 15-25 days; custom VIM+ESR vacuum ingot production 30-45 working days. Priority production line for MRO emergency aviation replenishment orders.

 

Q10: Standard heat treatment process for GH3128, need aging hardening?

GH3128 is single solid solution strengthened alloy, aging treatment is not required at all. Standard aviation solution process: 1140~118℃ holding, rapid air cooling after heat preservation. Only solution state can release full stamping, welding and high-temperature creep performance for aviation thin-wall components.

 

Q11: Suitable welding processes for aviation GH3128 seamless pipe & thin sheet?

TIG/GTAW is the primary welding process for aerospace flame tubes and heat pipes, MIG welding for thick structural plates. Key aviation processing tip: Control low welding heat input to avoid coarse grain; post solution stress relief annealing at 1130~1160℃ is recommended to restore 950℃ creep resistance. Our metallurgical team provides free aviation welding parameter guide upon inquiry.

 

Q12: What seaworthy aviation-grade export packaging for GH3128 long-distance sea shipment?

GH3128 Round Bar: Anti-rust oil coating, double waterproof film wrapping, steel strap fumigated wooden pallet

GH3128 Thin Sheet: Anti-rust interleaving paper + double waterproof film, sealed fumigated wooden case to avoid surface scratch

GH3128 Seamless Aviation Pipe: Two ends plastic dust sealing caps, internal & external anti-rust oil, single pipe separated wooden box, anti-collision buffer filling We shoot full container loading photos before shipment and provide real-time global logistics tracking.

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