Looking for the best high-temperature piping solution between premium Inconel 718 and the more affordable Incoloy 800HT? You've come to the right place. As a leading manufacturer and supplier of high-temperature alloy tubing with decades of experience in the energy and chemical industries, GNEE has both Inconel 718 and Incoloy 800HT tubing in stock. This guide provides a comprehensive comparative analysis to help you select the right material for your heat exchangers, furnaces, or process piping systems.
Comparison of nickel alloy 718 steel pipe and Incoloy 800HT seamless pipe
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Comparison of nickel alloy 718 steel pipe and Incoloy 800HT seamless pipe
Nickel-based alloy 718 is a precipitation-hardening high-strength alloy (tensile strength 1375 MPa) designed to withstand extreme stresses up to 700°C, making it ideal for the aerospace and oil and gas industries. Incoloy 800HT is a solid solution-strengthened alloy with a high iron content and moderate nickel content, exhibiting excellent oxidation resistance at temperatures up to 1100°C at a lower cost, making it suitable for furnace and petrochemical applications.
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What are the advantages of Inconel 718?
Inconel 718 is a high-strength, corrosion-resistant nickel-based superalloy. It possesses excellent mechanical properties, high-temperature strength, and resistance to oxidation and corrosion. Inconel 718 is widely used in various industries, including aerospace, oil and gas, automotive, and power generation.
Inconel 718 tubing: A precipitation-hardening nickel-chromium-iron-niobium alloy tubing. Through precise heat treatment (solution + aging) to precipitate strengthening phases, it achieves unparalleled high-temperature strength and creep resistance. It is a top-tier solution designed for extreme temperature (~700°C) and ultra-high pressure conditions.
Incoloy 800HT tubing: A solution-strengthened iron-nickel-chromium alloy tubing, an optimized high-carbon version (high carbon: 0.06-0.10%) of the classic 800 series alloy. Through microalloying and stabilization heat treatment of titanium and aluminum, it achieves excellent high-temperature creep strength, carburization resistance, and oxidation resistance, while maintaining good manufacturability and cost-effectiveness. It is a mainstay in high-temperature furnaces, heat exchangers, and steam systems.
Chemical composition of Inconel 718 pipe and Incoloy 800HT pipe
| Element | Inconel 718 (UNS N07718) | Incoloy 800HT (UNS N08811) |
|---|---|---|
| Nickel (Ni) | 50 - 55 | 30.0 - 35.0 |
| Chromium (Cr) | 17 - 21 | 19.0 - 23.0 |
| Iron (Fe) | Balance | ≥ 39.5 (Balance) |
| Niobium (Nb) | 4.75 - 5.5 | - |
| Molybdenum (Mo) | 2.8 - 3.3 | - |
| Titanium (Ti) | 0.65 - 1.15 | 0.15 - 0.60 |
| Aluminum (Al) | 0.2 - 0.8 | 0.15 - 0.60 |
| Carbon (C) | ≤ 0.08 | 0.06 - 0.10 |
High-Temperature Mechanical Properties of Inconel 718 and Incoloy 800HT Pipes
| Property | Inconel 718 Tubing (Aged Condition) | Incoloy 800HT Tubing (Annealed Condition) |
|---|---|---|
| Room Temperature Tensile Strength | ≥ 1275 MPa | ≥ 450 MPa |
| Room Temperature Yield Strength | ≥ 1035 MPa | ≥ 170 MPa |
| Maximum Recommended Service Temperature | ~700°C (based on strength) | ~900°C (based on oxidation/carburization resistance and long-term strength) |
| Yield Strength at 650°C | ~800 MPa (very high) | ~120 MPa (lower but stable) |
| Creep Resistance | Excellent (below 700°C) | Excellent (particularly outstanding in the 600-900°C range) |
| Thermal Fatigue Performance | Outstanding | Excellent |
Comparison of Inconel 718 and Incoloy 800HT Tubing Applications
Choose Inconel 718 tubing when your needs include:
* Aero-engines and gas turbines: High-pressure fuel lines, hydraulic lines, bleed air lines.
* Supercritical/ultra-supercritical power plants: Superheater/reheater tubes in the high-temperature section (~600-700°C), main steam piping (when design pressure is extremely high).
* High-performance reactors: Tubular reactors requiring simultaneous resistance to high temperature, high pressure, and corrosion.
Tube blanks for high-stress, high-temperature fasteners.
Choose Incoloy 800HT tubing when your needs include:
* Petrochemicals: Radiant section furnace tubes (~800-950°C) for ethylene cracking furnaces, hydrogen conversion furnaces, and reforming furnaces.
* Heat treatment industry: Carburizing furnaces, radiant tubes, feed baskets.
* Steam reforming and conversion: Steam reformer tubes for ammonia synthesis and methanol plants.
*Power plant boilers: Superheater/reheater tubes in the high-temperature section (~600-750°C) (when the design pressure is moderate).
General high-temperature heat exchanger tube bundles.
How to choose between Inconel 718 pipe and Incoloy 800HT pipe?
Inconel 718 and Incoloy 800HT Pipe Selection Strategies
Contact us to receive a free technical and commercial comparison report tailored to your specific pipe application. We offer side-by-side analysis of Inconel 718 and Incoloy 800HT, including allowable stress values, corrosion compatibility, and total installation cost predictions.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel 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
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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