What temperature range can GH4169 high-temperature alloy pipe withstand?
What temperature range can GH4169 high-temperature alloy pipe withstand?
GH4169 (typically equivalent to Inconel 718) high-temperature alloy tubing is generally suitable for long-term applications from -253°C to 650°C, exhibiting excellent yield strength and creep resistance. While its design operating temperature range falls within this range, it can also withstand short-term special applications up to 800°C or even 850°C.
What is the composition of GH4169 alloy?
The chemical composition of GH4169 alloy is 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%, Fe balance (weight percentage).
1. GH4169 - UNS N07718 Alloy Tube Equivalent Grade
| CHINA STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
| GH4169 | 2.4668 | N07718 | – | – | – | – | – | – |
2. Mechanical properties of GH4169 Pipe
| Element | Yield Strength (0.2%Offset) | Melting Point | Density | Tensile Strength | Elongation |
| GH4169/718 | MPa – 1034 | 1336 °C (2437 °F) | 8.19 g/cm3 | MPa – 1241 | Min 10 % |
3. Key Temperature Properties of GH4169 Steel Pipe
Optimal Operating Temperature Range: -253℃ to 650℃ (650℃ is generally considered the temperature with the highest structural efficiency).
Short-Term/Extreme Tolerance: Up to 800℃ to 850℃ (although strength begins to decrease at higher temperatures).
Oxidation Resistance: Excellent, up to 1000℃.
4. GH4169 Pipe Mechanical Performance Condition Matrix Table
| Service Condition | Max Temperature | Material Behavior | Industrial Application |
| Continuous Load | 650°C (1200°F) | Peak Yield Strength; Resists Creep. | Turbine discs, engine shafts. |
| Intermittent Burst | 700°C (1292°F) | Delayed aging; Short-term integrity. | Rocket motors, afterburners. |
| Static Oxidation | 980°C (1800°F) | Resists Scaling; Zero Load Capacity. | Thermal shields, baffles. |
5. Risks of Over-Aging GH4169 Tubes Above 700°C
GH4169 is a precipitation-hardening alloy, its strengthening primarily relying on the γ′′ (γ′) phase. This phase is the secret to its exceptional strength.
The Critical Point of 700°C: Once the metal is held at temperatures above 700°C for too long, the γ′′ phase begins to transform into the stable but weaker δ (δ) phase.
Result: Catastrophic softening of the material. Even after cooling, the material cannot regain its original strength.
Recommendation: If your environment's long-term operating temperature exceeds 750°C (1382°F), GH4169 is no longer a cost-effective solution. We recommend upgrading to Waspaloy or GH4141 (Rene 41).
Contact us to upgrade your alloy to suit your project
Why choose to source high-temperature GH4169 from our Tier 1 supplier, Gnee Alloy?
✅️VIM + VAR Melting: Our double-vacuum refining eliminates trace impurities that lower the over-aging threshold.
✅️Certified Performance: Every batch is tested for high-temperature tensile strength at 650°C.
✅️MTC 3.1 Traceability: Full heat analysis and creep-rupture data included.
✅️Wholesale Inventory: Massive stock of Sch 40/80 and heavy-wall tubing ready for Fast Global Shipping.
Contact us now to get the latest export price for GH4169 in 2026
FAQ
Q1: Can GH4169 handle cryogenic temperatures as well as heat?
A: Yes. GH4169 is a rare "dual-spectrum" alloy. It maintains exceptional toughness and ductility down to -253°C, making it ideal for liquid hydrogen fuel systems.
Q2: Will the pipe warp if it hits 800°C for 5 minutes?
A: Short spikes are usually survivable, but the cumulative time at high heat matters. Any exposure above 750°C begins the irreversible Over-aging process. We recommend a hardness check if such an event occurs.
Q3: Does welding affect the temperature limit?
A: If matching filler (ERNiCr-3) is used and a full solution + aging heat treatment is performed, the weld zone will match the base metal's 650°C performance.
Q4: How do I get the best price for bulk orders?
A: As a direct Manufacturer, we offer tiered Wholesale Pricing based on tonnage. Contact our sales team for a real-time quote linked to LME nickel rates.
