GH4090 Alloy
Equivalent grade: UNS N07090, W.Nr.2.4632
Forms: Bar, plate, sheet, strip, seamless tube，forging
Service temp: Long‑term ≤870℃; Short‑term up to 920‑950℃
Key features: Excellent creep‑rupture, stress‑relaxation & oxidation resistance
Applicable standards: GB/T 14992, HB 5287, BS HR5
Delivery condition: Solution‑aged treated
Mandatory test: PMI, UT / MT non‑destructive testing
Typical applications: Aero‑engine parts, high‑temp fasteners, springs, gas‑turbine components
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
- Send E-mail: ss@gneesteel.com
Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of GH4090 Alloy in China. If you're going to wholesale high quality GH4090 Alloy made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
High temperature GH4090 Alloy Description
Gnee Alloy GH4090 Alloy Description
GH4090 (globally known as Nimonic 90 / UNS N07090) is a nickel-based precipitation-hardened superalloy. It utilizes chromium (approx. 18–21%) and cobalt (approx. 15–21%) as primary alloying elements and achieves age-hardening through the addition of titanium and aluminum.
With a density of approximately 8.2 g/cm³, the alloy maintains excellent high-temperature strength, creep resistance, and oxidation resistance at temperatures up to 920°C, effectively resisting deformation in high-stress environments below 900°C.
Available product forms include round and flat bars, rods, seamless tubing, wire (commonly used for high-temperature springs), and coils. It can be shaped via cold drawing, forging, or hot working and exhibits good welding and forming characteristics, though specific aging treatments are required to maximize mechanical hardening properties.
Typical applications span the aerospace sector (gas turbine blades, turbine discs, high-temperature fasteners), automotive and racing industries (high-performance engine valves, high-boost turbocharger components, high-temperature disc springs), and general industry (components requiring high stress and extreme heat resistance, such as those used in petrochemical processing and resistance furnaces).
Equivalent grades for High temperature GH4090
| China (GB) | United States (Commercial Grade) | Germany (W-Nr.) |
|---|---|---|
| GH4090 | Nimonic 90 | N07090 / 2.4632 |
Available forms of GH4090 Alloy
Contact our experts to recommend the right alloy for your project
high temperature GH4090 Alloy Specification
| Parameter | GH4090 (GH90) |
|---|---|
| Material Type | Ni-Cr-Co based precipitation-hardening wrought superalloy (γ′ phase strengthened) |
| Corresponding Grades | Nimonic 90 (UK), UNS N07090 (USA), W.Nr. 2.4632 (Germany) |
| Product Forms | Hot-rolled / cold-drawn bar, cold-rolled plate/sheet, strip, cold-drawn wire, forgings (disks, blades, rings) |
| Typical Applications | Aero-engine turbine blades, turbine disks, high-temperature fasteners, clamps, seals, elastic elements, springs, gas turbine components |
| Service Temperature | Long-term up to 870°C; short-term up to 920–950°C |
| Strengthening Mechanism | γ′ phase [Ni₃(Al,Ti)] precipitation hardening + Co solid-solution strengthening + carbide (M₂₃C₆, MC) grain boundary strengthening |
| Density | 8.20–8.22 g/cm³ |
| Melting Range | 1310–1420°C (solidus ~1200°C) |
| Magnetic Properties | Non-magnetic |
| Applicable Standards | GB/T 14992, HB 5287 (bar), GB/T 14994 (cold-drawn bar), GB/T 14995/14996 (plate), YB/T 5249 (wire), GJB 3165 (aviation wire) |
Key Properties of GH4090 Alloy
Chemical composition of GH4090 alloy (wt%) – Per GB/T 14992
| Element | Min (wt%) | Max (wt%) | Role / Engineering Significance |
|---|---|---|---|
| Nickel (Ni) | - | Balance | Matrix element - provides austenitic structure and corrosion resistance |
| Chromium (Cr) | 18.0 | 21.0 | Core oxidation resistance - forms Cr₂O₃ protective film |
| Cobalt (Co) | 15.0 | 21.0 | Solid-solution strengthening - raises γ′ solvus temperature, improves creep resistance |
| Titanium (Ti) | 2.00 | 3.00 | Core strengthening - forms γ′ phase Ni₃(Al,Ti) with Al |
| Aluminum (Al) | 1.00 | 2.00 | Core strengthening - forms γ′ phase; contributes to oxidation resistance |
| Carbon (C) | - | 0.13 | Carbide former (M₂₃C₆, MC) - grain boundary strengthening |
| Iron (Fe) | - | 1.50 | Controlled impurity - maintains Ni-base matrix stability |
| Silicon (Si) | - | 0.80 | Deoxidation and casting aid |
| Manganese (Mn) | - | 0.40 | Deoxidation |
| Phosphorus (P) | - | 0.020 | Strict control - ensures hot workability |
| Sulfur (S) | - | 0.015 | Strict control - ensures hot workability and weldability |
| Boron (B) | - | 0.020 | Grain boundary strengthening (trace) |
| Zirconium (Zr) | - | 0.15 | Grain boundary strengthening (trace) |
| Copper (Cu) | - | 0.20 | Impurity element control |
Physical Properties of GH4090 Alloy
| Property | Value | Unit |
|---|---|---|
| Density | 8.20 – 8.22 | g/cm³ |
| Melting Range | 1310 – 1420 | °C |
| Elastic Modulus (20°C) | ~215 | GPa |
| Elastic Modulus (600°C) | ~185 | GPa |
| Elastic Modulus (700°C) | ~175 | GPa |
| Electrical Resistivity (100°C) | 1.18 | μΩ·m |
| Thermal Conductivity (20°C) | 11.3 | W/(m·K) |
| Thermal Conductivity (800°C) | 24.3 | W/(m·K) |
| CTE (25–800°C) | 13.7 × 10⁻⁶ | /°C |
| CTE (20–1000°C) | 16.5 × 10⁻⁶ | /°C |
| Magnetic Properties | Non-magnetic | - |
Click to download the GH4090 alloy PDF file now
High-temperature mechanical properties of GH4090
High-Temperature Tensile Properties (Typical)
| Temperature (°C) | UTS (MPa) | YS 0.2% (MPa) | Elongation (%) |
|---|---|---|---|
| 20 (RT) | ≥ 1175 | ≥ 785 | ≥ 13 |
| 650 | ~ 1000 – 1100 | ~ 650 – 750 | ≥ 12 |
| 700 | ~ 900 – 950 | ~ 600 – 650 | ≥ 12 |
| 750 | ~ 700 – 750 | ~ 500 | - |
| 815 | ~ 500 – 600 | - | - |
| 870 | ~ 400 – 450 | - | - |
| 900 | ≥ 300 | ≥ 220 | ≥ 20 |
High-Temperature Creep Rupture / Persistence
| Temperature | Stress / Condition | Performance |
|---|---|---|
| 750°C | 340–360 MPa | Rupture life ≥ 50–100 h |
| 815°C | 100–120 MPa | Rupture life ≥ 100–300 h |
| 900°C | 200 MPa | Rupture life ≥ 100 h |
| 980°C | 100 MPa | Rupture life ≥ 50 h |
| 850°C | 150 MPa | Creep rate ≤ 1×10⁻⁵ %/h |
Oxidation resistance of GH4090
| Property | Performance | Condition |
|---|---|---|
| Oxidation Resistance | Excellent up to 1040°C | Forms adherent Cr₂O₃ protective film |
| Oxidation Rate (1000°C) | ~0.05–0.10 g/(m²·h) | 100h in air |
| Oxidation Rate (1100°C) | < 0.1 g/(m²·h) | Static air |
| Oxidation Resistance (1040°C+) | Limited - potential intergranular oxidation | Avoid prolonged exposure >1040°C |
Note: Good oxidation performance up to 1040℃, but long‑term load‑bearing service temperature shall not exceed 870℃.
Contact us for information on our GH4090 production process
Three Core GH4090 Product Series, Full Manufacturing Process & Specifications
GH4090 Round Bar
Complete Production Workflow for Gnee Alloy GH4090 Bars
VIM + VAR Double Vacuum Melting (Mandatory for Aviation & Power Operators) Vacuum Induction Melting + Vacuum Arc Remelting eliminates element segregation, micro-shrinkage and trace harmful impurities (S, P), delivers homogeneous fine grain structure, avoids fatigue crack initiation under long-term cyclic high-load operation. All batches supplied to global top 10 aerospace & gas turbine operators apply this dual melting route to meet zero-defect safety standards.
2. Hot Working Forming
Hot Rolling: Small & medium diameter Φ10–80mm bars, high production efficiency, uniform grain distribution for mass fastener & small turbine part production
Hot Forging: Diameter over Φ80mm large billets, optimized for heavy-load turbine disks, shaft heads and high-pressure structural components for power station operators
3. Standard Two-Stage Aging Heat Treatment (Nimonic 90 Matching Process)
Solution annealing at 1080°C air cooling, hold 8 hours
Secondary aging at 700°C air cooling, hold 16 hours, to precipitate strengthening phases for maximum creep & tensile strength.
4. 100% NDT Non-Destructive Testing: Ultrasonic UT + Magnetic Particle MT inspection, Class A zero critical internal defects standard required by global aviation MRO operators
5. Post-processing: Straightening, fixed/random length cutting, customized surface finishing
Full Surface Finish Options for GH4090 Rod
| Surface Type | Craft & Feature | Target Global Operator Application Scenarios |
|---|---|---|
| Black Rolled/Forged Surface | Raw hot forming oxide skin, lowest unit cost | Heavy machinery OEMs, furnace equipment manufacturers for rough secondary CNC machining blanks |
| Peeled / Bright Surface | Centerless peeling removes surface decarburization & oxide layer, Ra ≤1.6μm, easy flaw inspection | General gas turbine auxiliary structural parts, mass fastener semi-finished stock for power station operators |
| Polished / Centerless Ground | Precision grinding on peeled blanks, tight tolerance h8/h9, Ra ≤0.8μm | Tier-1 aerospace operators, aero engine rotating shafts, high-temperature precision fasteners, elastic spring components |
GH4090 Bar Dimensional Range
| Parameter | Specification |
|---|---|
| Diameter | Small bar: Φ10 – 35 mm; Medium bar: Φ40 – 120 mm; Large forged billet: Φ130 – 500 mm+ |
| Length | Random length: 2000 – 5000 mm; Custom fixed length available (standard factory stock length: 3000 mm for global MRO quick delivery) |
| Dimensional Tolerance | Hot rolled: h10 / h11; Precision ground / polished: h8 / h9 |
GH4090 Bar Core Applications
Aerospace & Defense Operators: Aero engine turbine disks, low-pressure turbine blades, high-temperature fasteners, combustion chamber clamps, elastic sealing rings, stop pins & high-temperature spring componentsGnee Steel...
Power Gas Turbine Operators: Heavy-duty gas turbine rotor shafts, high-pressure compressor structural parts, long-cycle thermal circulation components under 815–870°C continuous load
Industrial Furnace & Thermal Equipment Operators: Furnace roller support frames, heat treatment fixture load-bearing structures, repeated heating-cooling high-temperature brackets
Petrochemical Energy Operators: High-temperature reactor internal support shafts, anti-oxidation pipeline fixing rods for high-heat process units
GH4090 Cold Rolled Sheet & Hot Rolled Plate
GH4090 Sheet Production Flow
1. VIM+VAR double smelting to guarantee sheet uniformity, prevent fatigue cracking under alternating temperature & mechanical load for turbine liner operators
2. Multi-pass cold rolling: Thin gauge 0.05–3.0mm sheets adopt repeated cold rolling + intermediate solution annealing to release rolling residual stress, ensure ultra-thin forming performance
3. Two-stage aging heat treatment matching Nimonic 90 international standard: Solution at 1150°C rapid cooling + secondary aging process to retain balanced strength and ductility for stamping complex thermal shielding partsSpecial Me...
4. Precision leveling & custom cutting: High-flatness leveling equipment; support laser blanking per customer technical drawings for one-step finished liner parts
5. Full surface appearance inspection, dimensional tolerance test and metallurgical grain inspection before shipment, meet the flatness tolerance standard of global aerospace liner operators
Standard Surface Finishes for GH4090 Sheet & Plate
| Surface Grade | Craft & Appearance | Main Usage Scenarios for Global Operators |
|---|---|---|
| 2B Finish (Cold Rolled, Annealed & Pickled) | Matte grey uniform pickled surface, mainstream export cost-effective grade | Aerospace combustion chamber liners, general thermal shielding plates for power plant operators; excellent stamping & welding performance |
| BA Bright Annealed | Inert gas atmosphere annealing, mirror oxide-free high-cleanliness surface | Premium aerospace OEMs, ultra-clean semiconductor thermal equipment precision thin sheets, sealing component raw materials |
| No.1 Hot Rolled Annealed & Pickled | Dark matte oxide-free surface, for plate over 4mm thickness | Large industrial furnace lining plates, mass thermal shield structural panels for thermal equipment manufacturers |
| Sand Blasted / Shot Peened | Uniform rough matte surface | Base material for thermal barrier coating (TBC), enhance coating adhesion strength for gas turbine hot-section component manufacturers |
GH4090 Sheet Size Specifications
| Parameter | Specification |
|---|---|
| Thickness | Cold rolled thin sheet: 0.05 mm ~ 3.0 mm; Hot rolled thick plate: 4.0 mm ~ 12.0 mm |
| Standard Width | 1000 mm / 1219 mm / 1500 mm; Custom slitting width supported for special equipment OEMs |
| Executive Standards | GB/T 14992, WS9 7086, ASTM B637, BS HR5 (Nimonic 90 international comparison standard) |
Application of GH4090 Sheet & Plate
Aerospace Core Market Operators: Jet engine combustion chamber liners, afterburner heat shielding baffles, aircraft engine pressure partition plates
Power Gas Turbine Operators: High-pressure compartment shielding plates, thermal cycle resistant structural panels under long-term 870°C circulation
Industrial Furnace & Heat Treatment Operators: Vacuum furnace high-strength lining plates, thermal shock resistant furnace structural panels
Petrochemical Equipment Operators: High-temperature reactor anti-oxidation lining, high-heat pipeline separation plates
GH4090 Seamless Tube Series
GH4090 seamless Tube Manufacturing Process
1. VIM+VAR double melting tube blanks, stable metallurgical structure, resist thermal fatigue under repeated high-pressure & temperature cycling required by offshore oil & gas operators
2. Cold forming: Cold Pilger + multi-pass cold drawing, uniform wall thickness, smooth inner & outer surface without micro-cracks
3. Standard solution + double aging heat treatment to eliminate cold work residual stress and achieve target mechanical strength matching Nimonic 90
4. 100% NDT inspection: Ultrasonic + eddy current testing to detect tube wall internal defects and wall thickness deviation, meet the safety standard of offshore pipeline operators
5. Surface finishing, precision length cutting, custom end threading & flanging service for energy equipment OEMs
Surface Options for GH4090 Tube
| Surface Finish | Description | Typical Applications |
|---|---|---|
| Bright Annealed (BA) | Mirror oxide-free surface | Semiconductor & ultra-clean laboratory high-pressure piping |
| Pickled & Annealed (AP) | Matte grey pickled surface, cost-effective | Power, furnace & general thermal equipment operators |
| Polished Tube | 180–600 grit mirror polishing | Precision instrument sensor sleeves, aerospace hydraulic piping |
GH4090 Pipe Dimensional Range
| Parameter | Specification |
|---|---|
| Outer Diameter | Capillary tube: Φ10 – 30 mm; Thin wall tube: Φ30 – 140 mm; Heavy wall tube: Φ140 – 320 mm |
| Wall Thickness | 0.5 mm – 25 mm; Custom ultra-thin & heavy wall tubes available for special energy equipment |
| Tolerance & Length | Custom fixed length; Strict dimensional tolerance per customer drawing requirements |
GH4090 Tube Application
Aerospace Hydraulic Operators: High-temperature hydraulic seamless tubes, aircraft engine fuel delivery pipes
Instrument & Temperature Sensor Operators: High-pressure thermocouple protection tubes, high-temperature probe outer casings
Semiconductor Manufacturing Operators: Ultra-clean high-pressure diffusion furnace process piping
Power Generation Operators: Gas turbine cooling medium conveying tubes, high-temperature heat exchange tubes
Contact our experts to recommend the right alloy for your project
Nickel Based Alloy GH4090 Packaging
Contact us to select your preferred packaging and shipping method
GH4090 alloy Global Key Export Markets
We supply full set documentation including EN 10204 3.1 / 3.2 MTC material test certificates and export customs clearance files for global end users. We maintain stable delivery to key markets with dedicated regional account support:
- Russia & CIS: Major consumption market for GH4090. Serving military & civil aviation, gas turbine power station MRO for turbine blades and high-temperature fasteners
- India: Fast-growing aerospace and energy market. Supporting Sukhoi fleet maintenance, gas turbine plant construction and offshore oil equipment OEM
- Pakistan: Military aerospace MRO and procurement of high-pressure structural parts for gas turbine power stations
- Middle East (UAE, Saudi Arabia, Iran): Offshore oil & gas enterprises, gas turbine MRO teams and petrochemical high-temperature furnace equipment manufacturers
- Southeast Asia (Vietnam, Thailand): Gas turbine component fabricators and thermal equipment OEMs for local power plant projects
- Western Europe (Germany, France): High-grade aerospace Tier 1 OEMs, offshore energy and semiconductor thermal equipment manufacturers
- USA, Japan, South Korea: Advanced aerospace aftermarket suppliers, precision medical and high-end energy equipment manufacturers
Contact us to customize a cost-effective solution for your project
About Gnee Alloy
Please submit an inquiry containing the following information to receive rapid, professional support tailored to large-scale industrial needs:
Required product form: Round bar / Plate / Seamless pipe
Complete specifications: Dimensions, thickness, surface condition, and order quantity (large-volume long-term framework orders or small-batch MRO trial orders)
End-use industry (e.g., aero-engines, gas turbines, oil & gas, industrial furnaces)
Destination country and special certification requirements (e.g., 3.2 material certificates/MTC, aerospace BS HR5 standards, dual-use export documentation)
Free laboratory samples for mechanical property and high-temperature oxidation resistance testing are available prior to the signing of large-volume framework orders.
Upon submission of your inquiry, we will immediately provide the digital technical data sheet for GH4090 and a comparative analysis report against Nimonic 90.
Flexible order support: We accept both small-batch MRO trial orders and large-volume annual framework orders, with long-term contract pricing benefits available for global corporate clients.
Core Strengths of Gnee Alloy's High-Temperature Alloy Plant
End-to-end closed-loop production line: Includes dedicated workshops for vacuum melting, hot forging, cold rolling, heat treatment, and surface finishing; ensures full control over product quality and delivery schedules to meet the rigorous delivery KPIs of global superalloy customers.
Aerospace-grade VIM+VAR dual vacuum melting process: Complies with international aerospace superalloy standards such as AMS and BS HR5, ensuring the absence of critical internal defects in safety-critical rotating aerospace components.
Comprehensive customization for large-scale industrial applications: Customizes diameter, thickness, length, and surface finish based on technical drawings; offers laser cutting and precision machining services for semi-finished products.
Rigorous multi-stage quality inspections meeting global aerospace audit standards: Covers raw material inspection, in-process metallurgical testing, finished product NDT and dimensional verification, and final pre-shipment checks for surface quality and mechanical properties; all inspection records are archived for 10 years for customer audits.
18 years of global superalloy export experience: Expert in international logistics, customs clearance, MTC certification, and export procedures for aerospace alloys classified as "dual-use items"; has served over 120 major industrial clients worldwide.
Free one-stop technical support for your R&D team: Provides alloy performance comparison reports, high-temperature performance data, and guidance on aging heat treatment and welding processes upon request.
Gnee Alloy GH4090 certificate
FAQ
Q1: Is GH4090 truly interchangeable with Nimonic 90 on my blueprint?
A: GH4090 (GH90) corresponds to Nimonic 90 (UNS N07090 / W.Nr.2.4632). Their chemical composition is highly aligned. For general projects they are interchangeable, full interchangeability shall be verified against project‑specified acceptance standard. Strictly follow drawing specification for aerospace critical rotating parts.
Q2: Why is GH4090 better for springs than Inconel X-750?
A: While X-750 is excellent, GH4090 has a higher Cobalt content, which provides superior resistance to Stress Relaxation at temperatures above 600°C. If your spring must maintain constant tension at 700°C+, GH4090 is the safer, more durable choice.
Q3: Can you provide GH4090 wire in the "Cold-Drawn" state for spring coiling?
A: Absolutely. We supply wire in the Work-Hardened or Solution Treated condition, tailored to your coiling equipment's requirements. We also provide the specific aging parameters to reach peak performance post-fabrication.
Q4: Do you offer bulk discounts for aerospace maintenance (MRO) contracts?
A: Yes. As a direct Tier-1 Manufacturer, we provide tiered Wholesale Pricing and dedicated inventory reserves for long-term contract partners.
Hot Tags: GH4090 Alloy, China GH4090 Alloy suppliers, Casting High Temperature Alloy, K4002 MAR M002 Alloy
You Might Also Like
Send Inquiry