In the field of high-performance materials, GH4169 (UNS N07718) is widely recognized as the most versatile nickel-based superalloy. Often referred to as the "Inconel 718 equivalent alloy," GH4169 is a precipitation-hardening alloy containing significant amounts of niobium, molybdenum, and chromium.
Its unique microstructure, primarily reinforced by the γ′′ (γ′) phase, endows it with exceptional tensile strength, fatigue strength, and creep rupture strength. For design engineers, GH4169 is the "gold standard" due to its combination of high strength, excellent weldability, and corrosion resistance.
Request GH4169 Technical Datasheet & Instant Quote
What is GH4169 - UNS N07718 High Temperature Alloy?
What is GH4169 - UNS N07718 High Temperature Alloy?
GH4169, also known as UNS N07718 or Inconel 718, is a high-strength, corrosion-resistant, precipitation-hardening nickel-chromium-based superalloy. It maintains excellent tensile strength, creep strength, and fracture strength even at temperatures up to 700°C (1300°F). GH4169 is renowned for its superior weldability and oxidation resistance, and is widely used in industries such as aerospace, nuclear power, and petrochemicals.
What is GH4169 equivalent to?
Inconel 718
GH4169 (equivalent to the American brand Inconel 718) is a precipitation-hardening nickel-based superalloy widely used in the aerospace industry due to its excellent mechanical properties (Lu et al., 2014).
1. Chemical composition of GH4619
|
ERAUM |
% |
Ni |
Cr |
Fe |
Mo |
Nb |
Co |
C |
Mn |
Si |
S |
Cu |
Al |
Ti |
P |
B |
|
GH4169 |
MIN |
50 |
17 |
balance |
2.8 |
4.75 |
- |
- |
- |
- |
- |
- |
0.2 |
0.65 |
- |
- |
|
MAX |
55 |
21 |
balance |
3.3 |
5.5 |
1 |
0.08 |
0.35 |
0.35 |
0.015 |
0.3 |
0.8 |
1.15 |
0.015 |
0.06 |
Click to download the GH3030 alloy PDF file now
2. GH4169 Physical Properties
|
density |
Alloy state |
tensile strength |
yield strength |
Elongation |
Elongation |
|
|
Rm N/mm2 |
Rp0.2 N/mm2 |
A5% |
HB |
|
|
8.24g/cm |
Solid solution treatmen |
≥965 |
≥550 |
≥30% |
≤363 |
|
Solid solution + aging |
≥1275 |
≥1034 |
≥12% |
≥331 |
3. GH4169 alloy standard
|
PRODUCT |
ASTM standard |
ASME standard |
|
Sheet, Plate |
B670 |
SB670 |
|
Seamless Pipe&tube |
B983 |
- |
|
Bar |
B637 |
SB637 |
|
Forging |
B670 |
SB670 |
4. GH4169 Temperature Performance from -253°C to 700°C
One of the biggest challenges buyers face is finding a material that doesn't become brittle at low temperatures and doesn't "burn" at high temperatures. GH4169 is one of the few alloys that can achieve both extreme temperatures:
1. Excellent High-Temperature Performance (up to 700°C): Unlike many alloys whose strength decreases above 500°C, the "phases" in GH4169 remain stable. This prevents creep deformation in components with constant thermal stress, such as aero-engine turbine disks and gas turbine components.
2. Low-Temperature Toughness (down to -253°C): Most high-strength metals become very brittle below zero degrees Celsius, posing safety hazards. GH4169, however, maintains excellent ductility and fracture toughness, making it an ideal material for liquid hydrogen storage tanks and cryogenic engineering.
5. Characteristics of GH4169 in Aero-engines
Aero-engine components, such as turbine disks, piston rings, and shafts, are subjected to enormous centrifugal forces and extremely high temperatures. The reasons for choosing GH4169 are as follows:
Weldability: Unlike other high-temperature alloys, GH4169 exhibits delayed aging response, meaning it does not experience strain-aging cracking during welding.
Fatigue Resistance: Its refined grain structure (achieved through a VIM+VAR dual-melting process) ensures extremely high fatigue life under vibration loads.
Check Our GH4169 Inventory - Bars, Sheets & Tubes
6. GH4169 Main Applications
GH4169/UNS N07718 is essential for critical, high-stress, and high-temperature components:
Aerospace: Jet engine components, rocket motors, turbine blades, and housings.
Energy Generation: Land-based gas turbines and nuclear reactor parts.
Oil & Gas: High-strength fasteners, connectors, pumps, and safety valves in sour service.
Why Choose Gnee Steel?
We are not just a supplier, but your premier high-temperature alloy partner.
✅️Superior Melting: We utilize Vacuum Induction Melting (VIM) + Vacuum Arc Remelting (VAR) technology to ensure ultra-low impurity content and extremely high microstructure uniformity.
✅️Standard Compliance: Fully compliant with AMS 5662, AMS 5596, and ASTM B637 standards.
✅️Traceability: Every shipment comes with a Level 3.1 Factory Test Certificate (MTC) detailing chemical composition analysis and mechanical property verification.
✅️Custom Processing: From precision-ground bars to custom-sized plates, we offer solutions directly applicable to your production lines.
Gnee Steel GH3030 Certificate
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel GH3030 Product Packing
Contact us for the latest export price quote for GH3030 Alloy
FAQ
Q1: Are GH4169 and Inconel 718 completely identical?
A: Yes. They have the same chemical composition and mechanical property requirements. GH4169 is the name used in Chinese standards, while Inconel 718 is a registered trademark of Special Metals. Both conform to UNS N07718 standard.
Q2: Can GH4169 be used in acidic gas environments containing hydrogen sulfide (H2S)?
A: Absolutely. When heat-treated to a specific hardness level, GH4169 meets the requirements of NACE MR0175 standard, making it an ideal material for high-pressure oil and gas well tools.
Q3: What is the most commonly used heat treatment method for GH4169?
A: For aerospace applications, solution treatment is usually used, followed by double aging treatment (usually 8 hours at 720°C + 8 hours at 620°C) to maximize the precipitation rate of the γ′′ phase.
