Information on Incoloy 800, 800H, and 800HT high-temperature piping
Information on Incoloy 800, 800H, and 800HT high-temperature piping
Incoloy 800, 800H, and 800HT are nickel-iron-chromium alloys used for high-temperature piping, primarily differing in carbon content and alloying elements: 800 (basic type) tubing is for general use; 800H (higher carbon content, controlled grain structure) alloy tubing offers improved creep resistance; and 800HT (with strict control of aluminum/titanium content) seamless tubing provides superior creep/rupture strength at temperatures above 600°C, making it ideal for petrochemical, power generation, and furnace components. They exhibit excellent oxidation and carburization resistance, with 800HT tubing performing best in extreme high-temperature environments, suitable for critical systems such as furnace tubes, heat exchangers, and process piping.
What is the heat treatment process for Incoloy 800 alloy?
The chemical composition of INCOLOY 800HT alloy falls within the composition range of 800H alloy, but with certain restrictions, and requires heat treatment at a minimum temperature of 2100°F (1149°C). Its carbon content is 0.06% to 0.10% (compared to 0.05% to 0.10% for 800H alloy), and its aluminum + titanium content is 0.85% to 1.20% (compared to 0.30% to 1.20% for 800H alloy).
Incoloy 800, Incoloy 800H, and Incoloy 800HT high-temperature pipes/tubes exhibit exceptional performance in corrosive environments. These alloys are specifically designed to withstand oxidation, carburization, and sulfidation at high temperatures. The high nickel content of the Incoloy 800 series alloys provides excellent corrosion resistance in both reducing and oxidizing environments. Furthermore, the chromium and iron elements in the alloy composition enhance its oxidation resistance, forming a protective oxide layer on the surface, thus preventing further corrosion.
Incoloy 800/800H/800HT high-temperature pipes/tubes also demonstrate excellent resistance to chloride stress corrosion cracking (SCC) and general corrosion in chloride-containing environments. This characteristic makes them suitable for applications exposed to chloride-rich environments, such as marine environments and chemical plants.
Specification Of 800 Incoloy High Temperature Pipe
| Pipe Standard | ASTM B407, ASTM B514, B515, ASME SB407, SB514, SB515 |
| Type | Seamless & Welded |
| Size Range | 6mm OD to 600 OD |
| Thickness | 1mm to 20mm |
| Schedule | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Value Added Services | Cutting, Beveling, Polishing, Threading, Destructive, Non Destructive, Ultrasonic Testing |
Gnee Steel offers the most comprehensive range of 800 Incoloy alloy high-temperature pipes
| Schedule 5 Incoloy 800H High Temperature Pipe | Schedule 10 Inconel 800H High Temperature Tubes |
| Schedule 160 Nickel Alloy 800 High Temperature Pipe | Schedule 40 Incoloy Alloy 800 High Temperature Pipe |
| ASTM B407 Alloy 800 High Temperature SMLS Tubing | Schedule XXS 800 Incoloy High Temperature Tube |
| Schedule 80 Incoloy 800 High Temperature Tubing | Large Diameter Incoloy 800H High Temperature Pipes |
| 800HT Incoloy High Temperature Tubing | ASTM B515 Incoloy 800 High Temperature Welded Tubes |
| Inconel 800 High Temperature Round Tube | Incoloy Alloy 800 High Temperature Piping |
| Incoloy 800 High Temperature Pipe Price 20 Feet | ASTM B407 800H High Temperature Seamless Pipe |
Equivalent grades for 800/800H/800HT Incoloy high-temperature pipes.
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
| Incoloy 800 | 1.4876 | N08800 | NCF 800 | NA 15 | ЭИ670 | Z8NC32-21 | X10NiCrAlTi32-20 | XH32T |
| Incoloy 800H | 1.4958 / 1.4876 | N08810 | NCF 800H | NA 15(H) | ЭИ670 | Z8NC33-21 | X5NiCrAlTi31-20 | XH32T |
| Incoloy 800HT | 1.4959 / 1.4876 | N08811 | NCF 800HT | NA 15(HT) | ЭИ670 | – | X8NiCrAlTi32-21 | XH32T |
Chemical Composition Of Incoloy 800/800H/800HT High Temperature Pipe
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr | Al | Ti |
| 800 | 0.10 max | 1.50 max | 1.00 max | 0.015 max | 0.75 max | 39.50 min | 30.00 – 35.00 | 19.00 – 23.00 | 0.15 – 0.60 | 0.15 – 0.60 |
| 800H | 0.05 – 0.10 | 1.50 max | 1.00 max | 0.015 max | 0.75 max | 39.50 min | 30.00 – 35.00 | 19.00 – 23.00 | 0.15 – 0.60 | 0.15 – 0.60 |
| 800HT | 0.06 – 0.10 | 1.50 max | 1.00 max | 0.015 max | 0.75 max | 39.50 min | 30.00 – 35.00 | 19.00 – 23.00 | 0.15 – 0.60 | 0.15 – 0.60 |
Mechanical Properties Of 800/800H/800HT Incoloy High Temperature Tubing
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.94 g/cm3 | 1385 °C (2525 °F) | Psi – 75,000 , MPa – 520 | Psi – 30,000 , MPa – 205 | 30 % |
Main Differences and Characteristics of Incoloy 800/800H/800HT
Incoloy 800 (UNS N08800): The basic grade, suitable for moderate high-temperature environments (up to approximately 650°C).
Incoloy 800H (UNS N08810): Higher carbon content and controlled grain size, resulting in higher creep strength and stress rupture strength compared to 800.
Incoloy 800HT (UNS N08811): Stricter limits on aluminum/titanium content, offering the highest creep strength and rupture strength, best suited for demanding conditions (above 600°C/1100°F).
Common Applications of Incoloy 800/800H/800HT
Hydrocarbon processing: Steam/hydrocarbon reforming, ethylene production (convection/cracking tubes).
Power generation: Superheater/reheater tubes, headers, furnace equipment.
Petrochemicals: Process piping, vessels, heat exchangers.
Heat treatment: Furnace components, carburizing fixtures, heating element sheaths.
Advantages of Incoloy 800/800H/800HT
Corrosion resistance: Excellent resistance to oxidation, carburization, and sulfidation at high temperatures.
Mechanical strength: High yield strength/tensile strength, especially 800H/HT, and good ductility.
Processability: Good weldability and machinability, suitable for complex systems.
Selection
For applications with temperatures above 600°C and where creep is a concern, 800H or 800HT should be selected, with 800HT offering the highest corrosion resistance in the most demanding environments.
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
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📦 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
