GH4169
UNS: N07718, W.Nr.2.4668
Equivalent: Inconel 718
Forms: Bar, plate, seamless tube
Applicable standards: ASTM B637,B670,AMS 5662,GB/T14992,GJB‑1952
Delivery condition:Solution‑treated / Solution‑treated + double‑aged
Mandatory test:PMI, UT/MT, mechanical test, metallurgical inspection
Typical industries:Aerospace, gas‑turbine,oil‑gas downhole,nuclear 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 GH4169 in China. If you're going to wholesale high quality GH4169 made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
High temperature GH4169 Alloy Description
Gnee Alloy GH4169 Alloy Description
GH4169 (globally known as Inconel 718 / UNS N07718) is a precipitation-hardened nickel-chromium superalloy. Its chemical composition is based on nickel (50–55%) and chromium (17–21%), with the addition of strengthening elements such as niobium (4.75–5.5%), molybdenum, titanium, and aluminum. It maintains excellent tensile strength, creep resistance, and oxidation resistance across an extreme temperature range of -253°C to 650°C.
It is considered one of the most deformation-resistant alloys at temperatures up to 650°C, boasting a high-temperature yield strength of approximately 1034 MPa. Additionally, it exhibits good weldability and machinability, making it suitable for manufacturing components with complex geometries.
Typical applications span the aerospace sector (critical high-stress components such as compressor disks, turbine blades, and power transmission shafts for aero-engines and rocket engines), power generation (gas turbine units and modern energy equipment), and the oil & gas and nuclear industries (components for harsh downhole environments and reactor assemblies requiring high corrosion and radiation resistance).
Equivalent grades for High temperature GH4169
|
PRODUCT |
ASTM standard |
ASME standard |
|
Sheet, Plate, Strip |
B670 |
SB670 |
|
Seamless Pipe & Tube |
B829 |
- |
|
Bar |
B637 |
SB637 |
|
Forging |
B670 |
SB670 |
Available forms of GH4169 Alloy
Contact our experts to recommend the right alloy for your project
high temperature GH4169 Alloy Specification
| Parameter | GH4169 (GH169) |
|---|---|
| Material Type | Precipitation-hardening (γ″ + γ′ phases) Ni-Cr-Fe based wrought superalloy |
| Corresponding Grades | Inconel 718 (USA UNS N07718), NC19FeNb (France), W.Nr. 2.4668 (Germany) |
| Product Forms | Bar, plate, sheet, strip, tube, wire, forgings (disks, rings, casings, shafts, blades, fasteners, springs) |
| Typical Applications | Aero-engine turbine disks, compressor disks, shafts, casings, blades, fasteners, gas turbine components, nuclear reactor internals, high-temperature dies, petrochemical equipment |
| Service Temperature | Long‑term load‑bearing service range:‑253℃ ~ 650℃; short‑term exposure up to 700℃ |
| Strengthening Mechanism | Precipitation hardening (γ″ phase Ni₃Nb + γ′ phase Ni₃(Al,Ti,Nb)); δ phase (Ni₃Nb) forms at grain boundaries to control ductility |
| Microstructure | Austenitic (γ) matrix + γ′ + γ″ + δ + NbC carbides |
| Weldability | Good; low crack susceptibility; suitable for arc welding, plasma welding, etc. |
| Magnetic Properties | Non-magnetic |
| Applicable Standards | GB/T 14992, GJB 1952, GJB 2297, GJB 2612, GJB 3165, GJB 3317 |
Key Properties of GH4169 Alloy
Chemical composition of GH4169 alloy (wt%) – Per GB/T 14992
| Element | Min (wt%) | Max (wt%) | Role / Engineering Significance | |
|---|---|---|---|---|
|
|
Nickel (Ni) | 50.0 | 55.0 | Matrix element - provides austenitic structure and corrosion resistance |
| Chromium (Cr) | 17.0 | 21.0 | Core oxidation/corrosion resistance - forms Cr₂O₃ protective film | |
| Iron (Fe) | - | Balance (approx. 18–22%) | Matrix element - cost reduction; base for Ni-Cr-Fe alloy system | |
| Molybdenum (Mo) | 2.8 | 3.3 | Solid-solution strengthening - enhances creep resistance | |
| Niobium (Nb) | 4.75 | 5.50 | Core strengthening element - forms γ' (Ni₃Nb) precipitate during aging; provides high-temperature strength | |
| Titanium (Ti) | 0.65 | 1.15 | Forms γ' precipitate Ni₃(Al, Ti) - co-strengthening with γ'; also forms carbides | |
| Aluminum (Al) | 0.20 | 0.80 | Forms γ' precipitate; contributes to oxidation resistance | |
| Carbon (C) | - | 0.08 | Grain boundary carbide former (NbC, TiC) - limits grain growth | |
| Cobalt (Co) | - | 1.00 | Trace element control | |
| Manganese (Mn) | - | 0.35 | Deoxidation | |
| Silicon (Si) | - | 0.35 | Deoxidation | |
| Sulfur (S) | - | 0.015 | Strict control - ensures hot workability and weldability | |
| Phosphorus (P) | - | 0.015 | Strict control - ensures toughness | |
| Copper (Cu) | - | 0.30 | Impurity element control | |
| Boron (B) | - | 0.006 | Grain boundary strengthening (trace) |
Note: For solution‑treated soft condition, max UTS ≤965 MPa. Hardness value shall not be taken as acceptance criterion when other mechanical indexes satisfy specification.
Physical Properties of GH4169 Alloy
| Property | Value | Unit |
|---|---|---|
| Density | 8.24 | g/cm³ |
| Melting Range | 1260 – 1320 | °C |
| Elastic Modulus (RT) | 199.9 | GPa |
| Shear Modulus | 77.2 | GPa |
| Electrical Resistivity (RT) | ~ 1.30 | μΩ·m |
| Poisson's Ratio | 0.3 | - |
| Coefficient of Thermal Expansion (20–100°C) | 11.8 × 10⁻⁶ | /°C |
| Coefficient of Thermal Expansion (20–900°C) | 18.4 × 10⁻⁶ | /°C |
| Magnetic Properties | Non-magnetic | - |
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GH4169 Room Temperature Mechanical Properties – Standard Specification
GH4169 Alloy Solution-Treated Condition (GB/T 14992)
| Condition | UTS (MPa) | YS 0.2% (MPa) | Elongation δ5 (%) | Hardness (HB) |
|---|---|---|---|---|
| Solution Treated | ≥ 965 | ≥ 550 | ≥ 30 | ≤ 363 |
Note: In the solution-treated condition, GH4169 must meet σb ≤ 965 MPa as a soft condition; if other properties are qualified, hardness is not used as a basis for rejection
GH4169 (Inconel 718) Experimental Reference: Comparison Between Solution-Treated and Aged States
| Condition | UTS (MPa) | YS 0.2% (MPa) | Elongation δ5 (%) | Hardness |
|---|---|---|---|---|
| Solution Treated (980°C × 11 min, WC) | 846 | 400 | 55 | 94 HRB |
| Solution Treated (980°C × 11 min, AC) | 823 | 341 | 56.5 | 90 HRB |
| Aged (720°C × 8h + 620°C × 8h, FC) | 1437 | 1284 | 22.5 | 45.5 HRC |
| Direct Aged | 1442 | 1262 | 22.5 | 45.5 HRC |
GH4169 (Inconel 718) Aerospace-grade high-strength condition
| Temperature | UTS (MPa) | YS 0.2% (MPa) | Elongation δ5 (%) | Reduction of Area ψ (%) |
|---|---|---|---|---|
| Room Temperature | ≥ 1400 | ≥ 1200 | ≥ 10 | ≥ 15 |
| 650°C | ≥ 1150 | ≥ 1000 | ≥ 12 | ≥ 15 |
GH4169 heat treatment process
GH4169 requires complex heat treatment to achieve optimal properties. Different heat treatment schedules can control grain size, δ phase morphology, distribution, and quantity to achieve different strength levels .
Standard Aging Heat Treatment (Most Common)
| Step | Temperature | Hold Time | Cooling |
|---|---|---|---|
| Solution Treatment | 980–1065°C (as specified) | ~ 1 hour | Oil/Water/Air Cool |
| 1st Aging | 720°C ± 5°C | 8 hours | Furnace Cool to 620°C at ≤ 50°C/h |
| 2nd Aging | 620°C ± 5°C | 8 hours | Air Cool |
Three Main Heat Treatment Categories
| Category | Solution Treatment | Aging | Application |
|---|---|---|---|
| Ⅰ | 1010–1065°C, 1h, OQ/WQ/AC | 720°C × 8h + 620°C × 8h | Coarse grain, no δ phase; improves impact and low-temperature hydrogen embrittlement resistance |
| Ⅱ | 950–980°C, 1h, OQ/WQ/AC | 720°C × 8h + 620°C × 8h | Moderate δ phase; improves strength and impact performance |
| Ⅲ | Direct Aging (DA) | 720°C × 8h + 620°C × 8h | Direct aging heat treatment without solution; minimizes δ phase; maximizes strength |
Click to view the GH4169 heat treatment process curve
Four Core GH4169 Product Lines, Manufacturing Process & Full Specifications
GH4169 Round Bar / Hot Forged Rod
Complete Production Workflow
1. VIM + VAR Double Vacuum Melting (Aviation Mandatory Standard) Vacuum Induction Melting + Vacuum Arc Remelting eliminates element segregation, micro-shrinkage and trace impurities, delivers homogeneous grain structure, avoids fatigue crack initiation under cyclic high-load operation. All aerospace & energy-grade GH4169 bars use this dual melting route.
2. Hot Working Forming
Hot Rolling: Small & medium diameter Φ10–80mm bars, high production efficiency, uniform fine grain
Hot Forging: Diameter over Φ80mm large billets, optimized for heavy-load turbine shaft, flange and high-pressure structural parts
3. Standard Two-Stage Aging Heat Treatment
Solution annealing at 960–980°C air cooling
Double aging at 720°C + 620°C to precipitate strengthening phases for maximum mechanical strength
4. 100% NDT Non-Destructive Testing: Ultrasonic UT + Magnetic Particle MT inspection, Class A zero critical internal defects for aviation delivery
5. Post-processing: Straightening, fixed/random length cutting, customized surface finishing
Full Surface Finish Options for GH4169 Rod
| Surface Type | Craft & Feature | Target Application Scenarios |
|---|---|---|
| Black Rolled/Forged Surface | Raw hot forming oxide skin, lowest unit cost | Rough secondary CNC machining, heavy forging blanks |
| Peeled / Bright Surface | Centerless peeling removes surface decarburization & oxide layer, Ra ≤1.6μm, easy flaw inspection | General machinery, turbine auxiliary structural parts, mass production semi-finished stock |
| Polished / Centerless Ground | Precision grinding on peeled blanks, tight tolerance h8/h9, Ra ≤0.8μm | High-precision turbine shafts, aircraft fasteners, rotating core components, medical precision parts |
GH4169 Round 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 length: 3000 mm) |
| Dimensional Tolerance | Hot rolled: h10 / h11; Precision ground / polished: h8 / h9 |
Core Applications of GH4169 Round Bar
Aerospace & Defense: Jet turbine disks, shafts, compressor blades, aircraft landing gear components, high-temperature fasteners
Power Gas Turbine: Gas turbine rotor shafts, high-pressure compressor structural parts, long-cycle high-load components under 650–700°C
Oil & Gas Energy: Deep well downhole tools, high-pressure valve stems, offshore corrosion-resistant structural shafts
Industrial High-Pressure Equipment: High-temperature mold holders, vacuum furnace heavy load support frames
GH4169 Cold Rolled Sheet & Hot Rolled Plate
GH4169 Cold Rolled Sheet Production Flow
1. VIM+VAR double smelting to guarantee sheet uniformity, prevent fatigue cracking under alternating load & temperature
2. Multi-pass cold rolling: Thin gauge 0.05–3.0mm sheets adopt repeated cold rolling + intermediate solution annealing to release rolling residual stress
3. Two-stage aging heat treatment: Standard solution + double aging process to retain balanced strength and ductility for forming
4. Precision leveling & custom cutting: High-flatness leveling equipment; support laser blanking per customer technical drawings
5. Full surface appearance inspection, dimensional tolerance test and metallurgical grain inspection before shipment
Standard Surface Finishes for GH4169 Sheet & Plate
| Surface Grade | Craft & Appearance | Main Usage Scenarios |
|---|---|---|
| 2B Finish (Cold Rolled, Annealed & Pickled) | Matte grey uniform pickled surface, mainstream export grade, cost-effective | Aerospace compressor casing liners, pressure vessel thin plates; good stamping & welding performance |
| BA Bright Annealed | Inert gas atmosphere annealing, mirror oxide-free high-cleanliness surface | Precision thin sheets for aerospace sealing components, ultra-clean semiconductor thermal equipment |
| No.1 Hot Rolled Annealed & Pickled | Dark matte oxide-free surface, for plate over 4mm thickness | Large power equipment pressure partition plates, industrial furnace heavy load shielding panels |
| Sand Blasted / Shot Peened | Uniform rough matte surface | Base material for thermal barrier coating (TBC), enhance coating adhesion strength for turbine hot-section parts |
GH4169 Plate 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 |
| Executive Standards | GB/T 14992, ASTM B637, AMS 5662 (Inconel 718 equivalent reference) |
Application of GH4169 Sheet & Plate
Aerospace Core Market: Jet engine compressor casing liners, turbine sealing baffles, aircraft engine pressure partition plates
Power Gas Turbine: High-pressure compartment shielding plates, thermal cycle resistant structural panels under 700°C
Oil & Gas Equipment: Corrosion-resistant pressure vessel liners, offshore platform high-temperature separation plates
Industrial Furnace & Heat Treatment: Vacuum furnace high-strength lining plates, high-pressure heat exchange panels
GH4169 Seamless Tube Series
Manufacturing Process
1. VIM+VAR double melting tube blanks, stable metallurgical structure, resist thermal fatigue under repeated high-pressure & temperature cycling
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
4. 100% NDT inspection: Ultrasonic + eddy current testing to detect tube wall internal defects and wall thickness deviation
5. Surface finishing, precision length cutting, custom end threading & flanging service
Surface Options for GH4169 Tube
Bright Annealed (BA): Mirror oxide-free surface, for semiconductor & ultra-clean laboratory high-pressure piping
Pickled & Annealed (AP): Matte grey pickled surface, cost-effective for energy & general thermal equipment
Polished Tube: 180–600 grit mirror polishing, precision instrument sensor sleeves, aerospace hydraulic piping
GH4169 Tube 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 |
| Tolerance & Length | Custom fixed length; Strict dimensional tolerance per customer drawing requirements |
GH4169 Tube Application Fields
Oil & Gas Energy: Deep well high-pressure downhole tubing, offshore corrosion-resistant process pipelines
Aerospace Hydraulic Systems: High-temperature hydraulic seamless tubes, aircraft engine fuel delivery pipes
Instrument & Temperature Sensors: High-pressure thermocouple protection tubes, high-temperature probe outer casings
Semiconductor Manufacturing: Ultra-clean high-pressure diffusion furnace process piping
Power Generation Equipment: Gas turbine cooling medium conveying tubes, high-temperature heat exchange tubes
Custom GH4169 Forgings
1. Production Process: VIM+VAR ingot → Hot billet forging → Precision die forming → Two-stage aging heat treatment → Full NDT inspection
2. Main Forging Products: Turbine disks, flanges, shaft heads, valve bodies, aircraft structural forgings
3. Core Application: Aerospace engine hot-section rotating parts, gas turbine heavy load components, oil & gas high-pressure valve forgings
Contact our experts to recommend the right alloy for your project
Nickel Based Alloy GH4169 Packaging
GNEE Group Alloy GH4169 Product Packaging
Contact us to select your preferred packaging and shipping method
GH4169 alloy Global Key Export Markets
We provide complete 3.1/3.2 MTC material test certificates, export customs clearance documents and dual-use material export permits for global buyers, stable supply to core demand regions:
India: Fast-growing aerospace & energy market, local Sukhoi aircraft fleet, gas turbine power plant construction and offshore oil equipment manufacturing drive stable procurement
Pakistan: Military aerospace MRO aftermarket, gas turbine power station high-pressure structural components
Middle East (UAE, Saudi Arabia): Offshore oil & gas equipment OEM, gas turbine MRO maintenance, petrochemical high-pressure pipeline components
Southeast Asia (Vietnam, Thailand): Local gas turbine component processing factories, energy equipment foundries
Western Europe (Germany, France): Premium aerospace OEM, offshore energy equipment & semiconductor thermal equipment manufacturers
USA, Japan, South Korea: Advanced aerospace aftermarket, precision medical & high-end energy equipment suppliers
Contact us to customize a cost-effective solution for your project
About Gnee Alloy
Submit your inquiry with below information to get fast professional support:
Required product form: Round bar / sheet / seamless tube / custom forging
Complete specifications: Dimension, thickness, surface finish, order quantity
End application industry (aerospace / gas turbine / oil & gas / industrial furnace etc.)
Target delivery country & special certification requirements (3.2 MTC, AMS aviation grade)
Free small lab samples for mechanical & corrosion performance testing before mass order
Instant digital GH4169 technical datasheet sent after inquiry submission
Flexible order support: Small trial orders & large bulk mass production both acceptable
Our Factory Core Strengths as Professional GH4169 Supplier
Full Integrated Closed-Loop Production Line: Independent vacuum smelting, hot forging, cold rolling, heat treatment, surface finishing workshops, fully control product quality & delivery schedule
Mandatory VIM+VAR Double Vacuum Melting for Aviation Grade: Meet international aerospace superalloy AMS standards, zero critical internal defects for rotating safety parts
Full Customization Support: Custom diameter, thickness, length, surface finish, laser cutting blanking, closed-die precision forgings per customer drawings
Multi-Round Strict Quality Inspection: Raw material inspection → Mid-process metallurgical test → Finished product NDT & dimension inspection → Final surface & mechanical performance test before shipment
18 Years High-Temperature Alloy Export Experience: Familiar with international logistics, customs clearance, MTC certification and dual-use material export procedures for aerospace alloys
Free One-Stop Technical Support: Provide alloy comparison reports, high-temperature performance data, aging heat treatment & welding processing guidance upon inquiry
Gnee Alloy GH4169 certificate
FAQ
Q1: What is GH4169 equivalent to?
A：Inconel 718.GH4169 is a high-strength, nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA)
Q2: What is the composition of GH4169 alloy?
A：The chemical composition of GH4169 alloy was as follows: Ni 53.44, Cr 18.56, Mo 3.02, Nb 5.3, Al 0.44, Ti 1.04, C 0.026, P 0.005, S 0.001, B 0.002 and Fe bal (wt. %).
Q3：Do you offer trial orders for prototype liners?
A: Yes. As a Reliable Supplier, we support aerospace and energy innovation. We offer Flexible MOQs on our in-stock inventory of standard gauges.
Hot Tags: GH4169, China GH4169 suppliers, Casting High Temperature Alloy, K4002 MAR M002 Alloy
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