GH3128 (GH128) Superalloy
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
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- Tel: +8615824687445
Key Global Export Markets for Gnee Alloy GH3128
We maintain a stable base of repeat volume customers across all key regions with demand for high-temperature alloys. The following market-specific purchasing patterns may assist you in material selection:
| Region / Country | Procurement Characteristics |
|---|---|
| Kazakhstan & CIS Countries (Largest export demand market for GH3128) | Large-scale framework bulk orders for military aviation MRO (Maintenance, Repair & Overhaul) and local gas turbine power plant construction; mandatory requirement for aviation-grade sheets and bars produced by VIM+ESR dual-refining process; complete dual-use export license documentation required for customs clearance audit. |
| India & Pakistan (Fast-growing repeat-purchase market) | Combination of small trial orders and annual long-term framework bulk contracts; primary demand for industrial-grade GH3128 sheets and pipes for local Sukhoi aviation fleets and thermal equipment OEM manufacturing; highly sensitive to unit price and MOQ (Minimum Order Quantity) flexibility. |
| Middle East (UAE, Saudi Arabia, Saudi Arabia) | Mainly MRO emergency replenishment orders; primarily procure GH3128 seamless pipes and sheets for offshore petrochemical high-temperature furnace equipment; strict requirement for MTC 3.2 full-item third-party material test certificates for factory supplier audits. |
| Southeast Asia (Vietnam, Thailand) | Main customers are local gas turbine component processing factories; procure bar blanks and 2B-finish sheets for subsequent CNC precision machining; extremely focused on delivery lead times (require rapid delivery); support very low MOQ small trial orders. |
| Western Europe (Germany, France) | High-end semiconductor and industrial furnace OEM manufacturers; demand BA bright-finish ultra-thin GH3128 sheets; each batch must provide SGS or TUV third-party witness inspection reports to comply with European factory audit standards. |
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GH3128 (GH128) Superalloy Description
Gnee Alloy GH3128 Alloy Description
GH3128 (also known as GH128) is a nickel-based solid-solution strengthened superalloy. It utilizes tungsten (W) and molybdenum (Mo) for solid-solution strengthening and incorporates trace elements such as boron and cerium to stabilize grain boundaries. The alloy exhibits excellent high-temperature ductility, outstanding weldability, and creep-rupture strength at temperatures up to 950°C, alongside superior long-term microstructural stability, oxidation resistance, and cold-forming properties. Its room-temperature mechanical property requirements include a tensile strength of ≥750 MPa and an elongation of ≥40%.
Available product forms include hot-rolled plates, cold-rolled sheets, forgings, welding wires, and bars. Due to its excellent comprehensive high-temperature performance, it is frequently used as a substitute for similar solid-solution strengthened alloys such as GH3044 and GH3536.
GH3128 Production Standard
| Product Form | Standards |
|---|---|
| Sheet/Strip | GJB 1952, GJB 3317, GB/T 14995, GB/T 14996 |
| Seamless Tube | GB/T 15062 |
| Welded Tube | GJB 2612 |
| Bar/Wire/Round Disc | GJB 2612, GJB 2617, GJB 3527A |
| Forging/Forged Flange | Q/3B 4088 (Capillary Material) |
Available forms of GH3128
Supply Specifications
| Product Form | Dimension Range |
|---|---|
| Cold-rolled Sheets | Thickness: 0.5–6.0 mm ; Width: 500–1500 mm |
| Hot-rolled Sheets | Thickness: 4–14 mm |
| Bars | Custom diameters available |
| Tubes | Custom available |
| Forgings | Custom available |
Contact our experts to recommend the right alloy for your project
high temperature GH3128 Alloy Specification
| Parameter | GH3128 (GH128) |
|---|---|
| Material Type | Ni-Cr based solid-solution strengthened wrought superalloy (W-Mo solid solution + B/Ce/Zr grain boundary strengthening) |
| Similar Grades | GH128, "Red Star 11" (Chinese); no direct ASTM/UNS equivalent |
| Product Forms | Cold-rolled sheet (0.8–4.0mm), hot-rolled plate (4–14mm), bar, forging, tube, strip, wire |
| Typical Applications | Aero-engine combustor flame tubes, afterburner casings, adjustment plates, gas turbine combustion chamber structural components, furnace rollers, high-temperature forming die liners |
| Service Temperature | Long-term up to 950°C; excellent oxidation resistance up to 1100°C |
| 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 14992, GJB 1952, GJB 2612, GJB 3317, GJB 3165, GB/T 14994, GB/T 14995, GB/T 15062 |
Key Properties of GH3039 Alloy
Chemical composition of GH3039 alloy (wt%)
| Element | Standard Range | Our Factory Strict Control Limit | Risk Reminder for Low-Cost Suppliers |
|---|---|---|---|
| Ni | Balance | Remainder | Unscrupulous factories reduce Ni content to cut cost, leading to rapid oxidation failure at 900℃+ |
| Cr | 19.0~22.0 | 19.5~21.5 | Cr below 19% will lose dense Cr₂O₃ anti-oxidation film at high temperature |
| W | 7.5~9.0 | 7.8~8.8 | Insufficient W reduces long-term creep strength, shortens flame tube service life |
| Mo | 7.5~9.0 | 7.8~8.8 | Matching W content ensures uniform solid-solution strengthening |
| Al, Ti | 0.4~0.8 each | 0.5~0.7 each | Balanced ratio to optimize cold forming ductility |
| Fe | ≤2.0 | ≤1.5 | Excess Fe causes sheet cracking during stamping complex liners |
| C | ≤0.05 | ≤0.04 | High carbon precipitates brittle grain boundary carbides, reduces thermal fatigue life |
| Impurity S/P | ≤0.013 each | ≤0.010 each | Excess S/P forms low-melting grain boundary segregation, triggers welding hot cracks |
| Trace B/Ce/Zr | Trace controlled | Standard upper limit 60% | Key elements to strengthen grain boundary, most small factories omit precise addition |
Physical Properties of GH3039 Alloy
| Property | Value | Note |
|---|---|---|
| Density | 8.81 g/cm³ | Some sources: 7.93–8.4 g/cm³ |
| Melting Range | 1340–1390°C | Some sources: 1364–1424°C |
| Elastic Modulus (RT) | 208 GPa | |
| Electrical Resistivity | 1.37 μΩ·m | |
| Poisson's Ratio | - |
Thermal Conductivity & Coefficient of Thermal Expansion
| Temperature (°C) | 100 | 900 |
|---|---|---|
| Thermal Conductivity λ / (W/(m·°C)) | 11.3 | ~25 |
| Coeff. of Thermal Expansion α / (×10⁻⁶/°C) | 11.25 (20–100°C) | 15.8 (20–900°C) |
Click to download the GH3128 alloy PDF file now
Key High-Temperature Mechanical Property Data for GH3128 Alloy
Standard heat treatment state: 1140~1180℃ solution annealing, air cooling
| Test Temperature | Tensile Strength Rm (MPa) Min. | Elongation A (%) Min. | Main Matching Working Scenario |
|---|---|---|---|
| Room Temperature | ≥750 | ≥30 | Cold stamping, bending, room temp secondary machining |
| 900℃ Long Cycle Service | ≥250 | ≥40 | Gas turbine medium-temperature shielding plates, furnace liners |
| 950℃ Continuous Stable Service | ≥175 | ≥40 | Aero engine flame tube, afterburner shell core working temperature |
| 1050℃ Short Peak Temperature | ≥90 | ≥50 | Intermittent high-temperature petrochemical equipment parts |
Specified stable service temperature range for GH3128 alloy
Long-term continuous safe working temperature: ≤950℃ (core design temperature for aviation hot-end parts)
Short-term instantaneous peak temperature tolerance: Up to 1050℃
Oxidation performance benchmark: 1000℃ static air oxidation weight gain ≤0.1mg/cm²·h, far superior to ordinary solid-solution nickel alloys
Contact us for information on our GH3128 production process
Oxidation resistance of GH3128 alloy
| Temperature (°C) | Oxidation Rate at 100h (g/(m²·h)) |
|---|---|
| 900 | ~0.055 |
| 1000 | ~0.236 |
| 1100 | ~0.269 |
GH3128 heat treatment process
| Product Form | Heat Treatment Regime |
|---|---|
| Cold-rolled / Hot-rolled Sheet | 1140–1180°C, Air Cool (soaking time depends on sheet thickness) |
| Medium Plate (δ 15–65 mm) | 1180–1200°C, Air Cool |
| Hot-rolled / Forged Bar | 1140–1200°C, Air Cool × (1.5–2) h |
| Disc Forgings | 1180–1200°C, Air Cool |
| Aero Combustion Liner Parts | 1160°C ± 10°C, Air Cool |
| Afterburner Parts | 1200°C ± 10°C, Air Cool |
| Intermediate Annealing (Multi-stage Stamping) | 1100°C ± 20°C |
Click to view the GH3128 heat treatment process curve
Three Core GH3128 Export Product Lines, Full Production Flow & Standard Export Specifications
GH3128 Round Bar
Production Processes for Two Grades of GH3128 for Different Export Customers
Industrial General Grade (Furnace, Petrochemical Non-Critical Parts): Single VIM vacuum induction melting → hot rolling/hot forging → 1160℃ solution heat treatment → straightening → surface processing → conventional UT ultrasonic inspection
Aviation MRO Premium Grade (Mandatory for Aero Engine Hot-End Components): VIM+ESR double vacuum melting → hot forming → standard solution annealing → 100% UT + MT magnetic particle full NDT inspection, Class A internal flaw level, meet global aviation supplier audit standards, complete dual-use material export permit documents available for Kazakhstan, CIS, EU aerospace buyers.
GH3128 Export Surface Condition and Application Scenarios
| Surface Finish | Key Features | Target Buyers / Applications |
|---|---|---|
| Black Hot Rolled / Forged Raw Surface | Lowest unit procurement cost; retains original hot-forming oxide skin | Global machinery processing factories purchasing blank raw materials for secondary CNC deep machining; large furnace fixture manufacturers |
| Centerless Peeled Bright (Ra ≤ 1.6 μm) | Completely removes surface decarburization layer; uniform bright surface; convenient visual inspection for internal defects | Most popular export finish for mass gas turbine auxiliary structural shafts; saves customer one peeling process and labor cost |
| Precision Centerless Ground / Polished (h8/h9 tolerance, Ra ≤ 0.8 μm) | Ultra-strict dimensional tolerance; mirror-smooth surface | Aerospace precision fastener manufacturers; small rotating shaft component factories with high-precision drawing requirements |
GH3128: Global Standard Stock Specification Range
| Parameter | Specification |
|---|---|
| Diameter Series | Small bar: Φ10 mm ~ Φ35 mm; Medium bar: Φ40 mm ~ Φ120 mm; Large customized forged billet: Φ130 mm ~ Φ500 mm |
| Length Specification | Random length: 2000 mm ~ 5000 mm (standard stock); Customizable fixed cutting length: 500 mm ~ 3000 mm per customer technical drawings |
| Tolerance Benchmark | Hot rolled blank: h10 / h11; Precision ground / polished bar: h8 / h9 tight tolerance |
Core Global Export Application of GH3128 Round Bar
Aerospace & Military MRO: Afterburner support brackets, flame stabilizer connecting rods, 950℃ medium-temperature aircraft fasteners
Power Gas Turbine OEMs: Combustion chamber small support shafts, long-cycle thermal load structural blanks working under 900~950℃
Industrial Furnace Equipment Factory: Furnace roller support frames, heat treatment fixture bearing rods
Petrochemical Plant: High-temperature reactor internal fixed support shafts, anti-oxidation pipeline fixing brackets
GH3128 Cold Rolled Sheet & Hot Rolled Plate
Manufacturing Process for GH3128 Sheet/Plate
VIM/VIM+ESR vacuum smelting ingot → multi-pass cold rolling + intermediate stress relief annealing → 1140~1180℃ solution treatment + rapid water cooling → high-precision leveling to meet international export flatness tolerance standard → laser cutting blank one-stop service → full metallurgical grain & surface visual inspection before shipment
Four Mainstream Export Surface Treatment Processes for GH3128 Sheets
| Surface Finish | Key Features | Target Buyers / Applications |
|---|---|---|
| 2B Cold Rolled Annealed Pickled Matte (No.1 Global Export Grade, 75% bulk orders choose this finish) | Uniform matte grey pickled surface; balanced cost; ultra‑high stamping ductility; excellent TIG welding performance | Global aerospace flame tube & afterburner liner mass production manufacturers; industrial vacuum furnace lining OEMs |
| BA Bright Annealed Mirror | Annealed under inert protective gas; zero surface oxide layer; ultra‑high surface cleanliness | Semiconductor thermal equipment manufacturers; high‑standard aerospace sealing thin‑sheet processing factories |
| No.1 Hot Rolled Annealed Pickled Plate | Dark matte oxide‑free surface; applicable only for plates over 4 mm thickness | Large industrial furnace mass lining production OEMs with low surface precision requirements |
| Sand Blasted / Shot Peened Rough Surface | Uniform matte rough surface; used as base substrate for thermal barrier coating (TBC) | Global gas turbine hot‑section component coating processing factories |
Export Standard Size Specifications (Permanent Factory Inventory Sizes)
| Parameter | Specification |
|---|---|
| Thickness Classification | Cold rolled thin sheet: 0.05 mm ~ 3.0 mm; Hot rolled thick plate: 4.0 mm ~ 12.0 mm |
| Standard Export Width | 1000 mm / 1219 mm / 1500 mm; Customizable slitting width for special non-standard equipment |
| Compliance Standard | GB/T 14992, GJB 1952 (aviation standard); Support third-party SGS/TUV test reports matching overseas customer internal audit requirements |
Core Export Application of GH3128 Sheet & Plate
Aerospace Core OEMs: Jet engine main combustion chamber flame tubes, afterburner heat shielding baffles, engine 950℃ medium-temperature partition plates (unique material designated by global aviation OEMs)
Gas Turbine Manufacturers: 900~950℃ thermal cycle resistant compartment shielding plates, transition section lining thin plates
Vacuum Furnace Equipment Factory: Furnace integral lining plates, repeated heating-cooling thermal shock resistant structural panels
Petrochemical High-Temperature Equipment: High-temperature reactor anti-oxidation lining plates, high-heat pipeline separation sheets
GH3128 Seamless Tube
Production Process for GH3128 Seamless Pipes
Vacuum melted GH3128 tube blank → cold pilger + multi-pass cold drawing to strictly control wall thickness deviation → solution heat treatment to eliminate cold working residual stress → 100% eddy current + ultrasonic dual NDT inspection to detect internal tube wall defects → surface finishing & customized tube end flanging/threading processing
Three Export Surface Types for GH3128 Seamless Tube
| Tube Finish | Surface Description | Target Market / Typical Application |
|---|---|---|
| BA Bright Annealed | Mirror, oxide‑free, ultra‑clean surface | Mainly exported to semiconductor diffusion furnace manufacturers |
| AP Pickled & Annealed | Matte grey, cost‑effective surface | Mainstream global orders for furnace radiant heating tubes |
| 180~600 Grit Mirror Polished | Mirror‑polished surface | Dedicated tubing for precision instrument thermocouple protection sleeves and aerospace hydraulic pipelines |
Export specifications for GH3128 seamless pipes
| Parameter | Specification |
|---|---|
| Outer Diameter Classification | Capillary tube: Φ10 – 30 mm; Thin wall tube: Φ30 – 140 mm; Heavy wall customized tube: Φ140 – 320 mm |
| Wall Thickness | 0.5 mm – 25 mm; Customizable ultra-thin wall and extra heavy wall per customer drawing specifications |
| Custom Processing Services | Fixed length cutting, tube end flanging, threading, sealing cap processing for overseas pipeline manufacturers |
Application Industries for GH3128 Tubing
Furnace & Thermal Equipment Factory: Furnace radiant heating tubes, heating element protection sleeves working under 950℃
Instrument & Sensor Manufacturers: High-temperature thermocouple protection tubes, high heat probe outer casings
Environmental Waste Treatment Equipment: High-temperature flue gas conveying pipeline liners, thermal decomposition reactor internal tubes
Semiconductor Manufacturing Plant: Ultra-clean high-temperature diffusion furnace process piping
Nickel Based Alloy GH3128 Packaging
GNEE Group Alloy GH3128 Product Packaging
Why Global Buyers Prefer GH3128 Over GH3044/GH3039
Superior Long-Term Creep and Thermal-Mechanical Fatigue Resistance
Field procurement data from over 280 global manufacturers shows that GH3128 offers 30% higher 100-hour stress-rupture strength at 950°C and a 2.3-fold increase in thermal-mechanical fatigue life compared to GH3044. This effectively resolves common issues faced by aviation MRO (Maintenance, Repair, and Overhaul) customers using GH3044, such as flame tube cracking and short service life.
Excellent Cold Stamping Formability for Complex, Thin-Walled Parts
GH3128 exhibits significantly better ductility in the solution-treated state than GH3044. When subjected to identical complex flame tube forming processes, the stamping scrap rate drops by 42%, substantially reducing material waste costs during mass production.
A Perfect Balance of Cost and Comprehensive High-Temperature Performance
For equipment operating stably under long-term cyclic temperatures of 900–950°C, GH3128 is priced only 10–15% higher than GH3044, yet it vastly outperforms the latter in high-temperature load-bearing capacity and fatigue resistance, resulting in a 35% reduction in the equipment's total lifecycle operating costs.
Superior Weldability and Low Susceptibility to Hot Cracking
Compatible with standard TIG/MIG welding processes used in major global manufacturing facilities, GH3128 requires no special parameter adjustments or preheating for thin-walled sheet welding, thereby lowering the technical barrier for welding operations.
Contact us to customize a cost-effective solution for your project
About Gnee Alloy
To ensure we can promptly provide the most accurate factory-direct pricing and appropriate material grade recommendations, please include the following information in your inquiry email:
Required GH3128 product form: Round bar / Plate or sheet / Seamless pipe
Precise, complete dimensions: Diameter/thickness × width × length, along with surface finish requirements
Actual operating temperature and application environment (e.g., aero-engine MRO / gas turbines / industrial furnaces / petrochemicals)
Order type: Small-batch trial order / Annual bulk framework contract / Urgent MRO replenishment
Destination country and specific certification requirements (e.g., 3.1 material certificate / 3.2 third-party inspection / dual-use item export license)
Provision of free laboratory-scale samples for high-temperature performance testing (buyer covers international shipping costs only)
Immediate delivery of the complete GH3128 technical data sheet and a comparison report between GH3128 and GH3044 upon submission of the inquiry
Comprehensive support for custom fabrication based on drawings, laser cutting, special tolerances, and customized surface finishes
Our Factory Core Strengths as Professional GH3128 Supplier
As a manufacturer of superalloys integrating production and export with 18 years of experience, Gnee Alloy operates facilities that fully meet the rigorous supplier audit standards of procurement departments in the global aerospace, power generation, and petrochemical industries:
Fully integrated, closed-loop production line: Featuring independent workshops for vacuum melting, hot/cold rolling, heat treatment, precision machining, and testing; by eliminating the need to outsource intermediate processes, we maintain comprehensive control over product quality and delivery schedules.
Comprehensive professional testing laboratory: Equipped with a full suite of instruments-including spectrometers, high-temperature tensile testing machines, ultrasonic and eddy current flaw detectors, and metallographic microscopes-ensuring 100% inspection of every batch prior to shipment.
Robust international certification system: Certified under ISO9001, ISO14001, and ISO45001, as well as third-party certifications from SGS and TÜV Rheinland; all documentation fully complies with global supplier audit standards.
Professional cross-border team with 18 years of experience exporting GH3128: Experts in handling export licenses for dual-use items, customs clearance, airworthy packaging, and end-to-end logistics tracking.
Flexible order support system: No strict Minimum Order Quantity (MOQ) for small-batch trial orders; exclusive, stable pricing agreements for long-term annual framework contracts; and complimentary laboratory samples provided for customer performance testing.
Gnee Alloy GH3128 certificate
FAQ
Q1: What core advantage makes GH3128 different from GH3044? What is its long-term stable service temperature?
A: GH3128 uses 16% total W+Mo composite solid-solution strengthening plus B/Ce/Zr grain boundary strengthening elements, its comprehensive creep strength and thermal cycle fatigue resistance are 30% higher than GH3044 at 900~950℃, cold stamping ductility is also far better, more suitable for complex thin-wall flame tube parts with frequent heating-cooling cycles.
Long-term continuous stable service temperature: ≤950℃
Short-term instantaneous peak temperature tolerance: Up to 1050℃ It is a single-phase solid-solution alloy, no aging heat treatment required, only single solution annealing can release its full performance.
Q2: What three core product forms of GH3128 can you supply? What standard sizes are in permanent stock?
A: We fully produce three mainstream finished forms for global export, all standard inventory sizes support fast MRO emergency delivery:
GH3128 Round Bar & Forged Billet Diameter Φ10mm~Φ500mm; random length 2000~5000mm, customizable fixed cutting length; surface options: black forged, peeled bright, centerless ground polished (h8/h9 tight tolerance)
GH3128 Cold Rolled Sheet & Hot Rolled Plate Thickness: Thin sheet 0.05~3.0mm; thick plate 4.0~12mm; standard width 1000/1219/1500mm, customizable slitting width; surface finishes: 2B, BA bright annealed, No.1 hot rolled pickled, sand blasted
GH3128 Seamless Cold Drawn Tube Outer diameter Φ10~320mm; wall thickness 0.5~25mm; surface: BA bright tube, AP pickled tube, 180~600 grit mirror polished tube We also provide secondary processing: laser cutting, precision peeling, tube end flanging/threading, blank forging per customer drawings.
Q3: Two melting grades of GH3128, what's the difference for export audit & cost?
A: We offer two melting processes to match different customer budget and industry audit standards:
Industrial General Grade (Single VIM Vacuum Induction Melting) Suitable for ordinary industrial furnace, petrochemical non-critical high-temperature parts, cost-saving option, basic UT ultrasonic inspection provided with shipment.
Aviation MRO Premium Grade (VIM+ESR Double Vacuum Melting) Mandatory for aero engine flame tube, gas turbine hot-section core components. Eliminates element segregation, micro-shrinkage and harmful S/P impurities locked far below standard limits, attached with 100% UT+MT full NDT Class A internal flaw report, meets global aviation supplier audit requirements, complete dual-use material export documents available for Kazakhstan, CIS, EU aerospace clients.
Q4: Which surface finish of GH3128 sheet is the most popular for global bulk export orders?
A: The 2B cold rolled annealed & pickled matte finish accounts for 75% of our overseas bulk GH3128 sheet orders. It balances procurement cost, ultra-high stamping ductility and excellent welding performance, the primary choice for mass production of aviation flame tubes and furnace lining plates by global OEM manufacturers. Other special surface options for customized demands:
BA Bright Annealed Mirror Finish: High-cleanliness oxide-free surface for semiconductor thermal equipment & aerospace sealing thin sheets
No.1 Hot Rolled Pickled Plate: Only for heavy furnace lining plates over 4mm thickness, low surface precision demand
Sand Blasted Surface: Used as substrate for thermal barrier coating (TBC) on gas turbine hot-section components.
Q5: What impurity content limits do you strictly control for GH3128? Why this matters for customer production?
A: Our factory locks all harmful impurity elements far below national standard upper limits for every batch: Sulfur ≤0.010%, Phosphorus ≤0.010%, Fe ≤1.5% (national standard upper limit Fe ≤2.0%). From 20 years of procurement on-site data verification: Many low-cost small factories raise Fe, S, P content to cut raw material cost, which directly leads to sheet cracking during complex flame tube stamping, premature oxidation peeling and shortened service life under 950℃ cyclic high temperature. Every GH3128 shipment attaches full spectral composition test report for your factory audit.
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