Incoloy 800/800H/800HT Pipes & Pipe Fittings
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Incoloy 800/800H/800HT Pipes & Fittings Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier and stockist of Incoloy 800/800H/800HT pipes and fittings based in Mumbai, India. We supply seamless pipes per ASTM B407 / ASME SB407, welded pipes per ASTM B514/B515, condenser tubes per ASTM B163, buttweld fittings per ASTM B366, and forged fittings per ASTM B564.
All three share an iron-nickel-chromium base: 30-35% Ni, 19-23% Cr, 39.5% min Fe, providing oxidation, carburisation, and sulfidation resistance that austenitic stainless steels cannot match at elevated temperatures. Incoloy 800 (UNS N08800) handles service up to 593°C (1100°F). Incoloy 800H (N08810) pushes that to 816°C (1500°F) through mandated higher carbon and coarser grain size. Incoloy 800HT (N08811) goes further still, tightening Al+Ti to 0.85-1.20% and requiring annealing at 1149°C minimum to deliver the highest creep-rupture strength above 816°C.
At room temperature, all grades have a minimum tensile strength of 517 MPa (75 ksi) and a minimum elongation of 30%. The yield strength is 207 MPa (30 ksi) for Incoloy 800 and 172 MPa (25 ksi) for Incoloy 800H/800HT. Pipe sizes range from NPS 1/2″ to 24″ in schedules SCH 5S through XXS. Buttweld fittings are available from NPS 1/2″ to 48″ (elbows, tees, reducers, caps, stub ends). Forged fittings are supplied in pressure classes from 2000# to 9000#. Equivalent Werkstoff numbers: 1.4876 / 1.4958 / 1.4959. EN 10204/3.1 mill test certificates, and fast delivery from our Mumbai stock.
Incoloy 800/H/HT Pipes & Fittings - Specifications
Key specifications for Incoloy 800, 800H, and 800HT pipes and fittings, including product types, sizes, standards and schedules:
| Pipes Specifications | |
|---|---|
| Parameter | Details |
| Pipe & Tube Standards | ASTM B407, B514, B515, B775, B163 / ASME SB407, SB514, SB515, SB775, SB163 |
| Size Range | NPS 1/2″ to 24″; OD 6.35-609.6 mm |
| Wall / Schedule | SCH 5S, 10S, 40S, 40, 80S, 80, 120, 160, XXS |
| Condition / Heat Treatment | 800: ~980°C anneal; 800H: ≥1038°C; 800HT: ≥1149°C |
| Fittings Specifications | |
| Parameter | Details |
| Fittings Standards | Buttweld Fittings: ASTM B366 / ASME SB366 |
| Dimensions | ASME B16.9, B16.28 |
| Size | BW Size: NPS 1/2″ to 48″ |
Chemical Composition of Incoloy 800/800H/800HT Pipes & Fittings
Chemical composition of Incoloy 800, 800H, and 800HT pipes and fittings, sharing one base alloy but varying in carbon and Al+Ti levels:
| Material / Element | Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Carbon (C) | Al + Ti | Grain Size | Min Anneal |
|---|---|---|---|---|---|---|---|
| 800 (N08800) | 30.0-35.0 | 19.0-23.0 | 39.5 min | 0.10 max | 0.30-1.20 | Not specified | ~980°C |
| 800H (N08810) | 30.0-35.0 | 19.0-23.0 | 39.5 min | 0.05-0.10 | 0.30-1.20 | ASTM 5 or coarser | ≥1038°C |
| 800HT (N08811) | 30.0-35.0 | 19.0-23.0 | 39.5 min | 0.06-0.10 | 0.85-1.20 | ASTM 5 or coarser | ≥1149°C |
The Fe-Ni-Cr base provides oxidation, carburisation, and sulfidation resistance. 800H mandates higher carbon (0.05-0.10%) and coarser grain for improved creep above 593°C. 800HT tightens Al+Ti to 0.85-1.20% with a higher anneal temperature, producing optimised gamma-prime precipitation for the highest creep-rupture strength. Nickel at 30-35% prevents sigma-phase embrittlement during prolonged high-temperature exposure.
Mechanical Properties of Incoloy 800/800H/800HT Pipes & Fittings
Mechanical performance of Incoloy 800, 800H, and 800HT pipes and fittings, showing room-temperature values per ASTM B407 in the annealed condition:
| Property | Tensile (min) | Yield 0.2% (min) | Elongation (min) |
|---|---|---|---|
| 800 (N08800) | 517 MPa (75 ksi) | 207 MPa (30 ksi) | 30% |
| 800H (N08810) | 517 MPa (75 ksi) | 172 MPa (25 ksi) | 30% |
| 800HT (N08811) | 517 MPa (75 ksi) | 172 MPa (25 ksi) | 30% |
800H and 800HT show lower room-temperature yield because the coarser grain (ASTM 5 or coarser) needed for creep resistance reduces yield at ambient conditions. The real advantage appears above 593°C: 800HT provides higher ASME allowable design stresses than 800H at 650-900°C per Code Case 1987. At 816°C, Alloy 800 tensile drops to ~172 MPa; 800H/HT retains 138-172 MPa with significantly better rupture life.
Incoloy 800/800H/800HT Equivalent Grades
Equivalent grades of Incoloy 800, 800H, and 800HT, including key international standards and designations used across global specifications:
| Property | UNS | Werkstoff | JIS |
|---|---|---|---|
| 800 | N08800 | 1.4876 | NCF 800 |
| 800H | N08810 | 1.4958 | NCF 800H |
| 800HT | N08811 | 1.4959 | NCF 800HT |
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Types of Incoloy 800/800H/800HT Pipes & Fittings
Manufactured in multiple forms for high-temperature piping, from furnace components at 1100°C to nuclear steam generator tubing:
Incoloy 800 Seamless Pipe
Incoloy 800HT Welded Pipe
Incoloy 800H Condenser Tube
Incoloy 800H ERW / EFW Pipe
Incoloy 800HT Elbow (45° / 90° / 180°)
Incoloy 800 Tee (Equal / Reducing)
Incoloy 800H Reducer
Incoloy 800H Cap & Stub End
Industries Using Incoloy 800/800H/800HT Pipes & Fittings
Specified where piping operates continuously above 593°C with oxidation, carburisation, and creep resistance required:
- Petrochemical & Ethylene Production: The largest application for 800H/HT pipes. Ethylene pyrolysis furnace cracker tubes, pigtails, crossovers, and outlet headers. Steam-methane reformer pigtails and manifolds.
- Heat-Treating Equipment: Radiant tubes, muffles, retorts, fixtures, and conveyor belts in heat-treating furnaces. Baskets and trays for carburising and nitriding atmospheres.
- Power Generation: Superheater and reheater tubing. Steam generator tubing. Boiler piping operating above 593°C.
- Nuclear Energy: PWR steam generator tubing (Alloy 800 primary grade). ASME Code Cases N-20 and N-253.
- Chemical Processing: Organic acid production piping (acetic acid, vinyl chloride). Nitric acid handling. Aqueous corrosion service up to 593°C.
- Industrial Furnaces: Electrical heating element sheathing. Thermocouple protection tubes. Furnace chamber and exhaust piping.
- Refining & Gas Processing: Hydrocarbon cracking and reforming piping. Hydrogen plant piping. Sulfur-containing gas processing.
How to Order Incoloy 800/800H/800HT Pipes & Fittings from Nicorex Alloys
To order Incoloy 800/800H/800HT Pipes & Fittings, follow these instructions:
- Product Form: Seamless Pipe or Fittings (Elbow, Tee, Reducer, End Cap, Stub End)
- Size: Pipes — OD x WT or NPS x Schedule / Fittings: NPS x Schedule
- End Type / Connection: Pipes: PE / BE / TE / Fittings: Butt Weld
- Material Grade: Incoloy 800 / UNS N08800 / W.Nr. 1.4876 or 800H / UNS N08810 / W.Nr. 1.4958 or 800HT / UNS N08811 / W.Nr. 1.4959
- Quantity: Number of pieces or total weight in kg / MT
- Standard: Pipes — ASTM B407 / ASME SB-407 / Fittings — ASTM B366 / ASME SB-366, ASME B16.9, ASME B31.3
- Documentation: MTC EN 10204 3.1/3.2, PMI Report, Chemical Composition Report, Mechanical Properties Report, Grain Size Report (800H / 800HT), IGC Test Report, TPI Certificate
- Packaging: PVC end caps on pipes / individual polybag per fitting, bundled with steel strapping, ISPM 15 compliant export crating with VCI wrap and full labelling
- Packaging: PVC end caps on pipes / individual polybag per fitting, bundled with steel strapping, ISPM 15 compliant export crating with VCI wrap and full labelling
- Delivery Destination: Domestic
Frequently Asked Questions
What is the difference between Incoloy 800 and 800HT?
Alloy 800 variants share a Ni-Fe-Cr base. 800H uses higher carbon and coarse grains for creep resistance; 800HT restricts Al+Ti, needs higher annealing, and qualifies as 800H but not vice versa.
What ASTM standard covers Incoloy 800H Seamless Pipe?
ASTM B407 / ASME SB407 covers all three grades (N08800, N08810, N08811). Welded pipe: B514. Fittings: B366 (buttweld).
What is the Maximum Operating Temperature for Incoloy 800HT Pipe?
Service above 816°C (1500°F), with intermittent use up to ~1100°C. ASME Code Case 1987 provides allowable design stresses. For higher continuous temperatures, consider Inconel 600 (up to 1093°C).
What is the price of Incoloy 800H Pipe in India?
Depends on grade (800/800H/800HT), size, schedule, quantity, and nickel market rates. Contact Nicorex Alloys for current pricing.
What Welding Filler Metal is used for Incoloy 800H/HT Pipe?
ERNiCr-3 (FM 82) for GTAW or ERNiCrMo-3 (FM 625). SMAW: ENiCrFe-3 (Electrode 182). No preheat; interpass ≤150°C. Solution annealing after welding is recommended for optimum creep properties.
Why is 800HT preferred over 800H for High-Temperature Service?
800HT’s tighter Al+Ti (0.85-1.20% vs 0.30-1.20%) and higher anneal (≥1149°C vs ≥1038°C) produce optimised gamma-prime precipitation, giving higher ASME allowable stresses above 816°C. This can enable thinner pipe walls, reducing material cost and weight.