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Incoloy 800/800H/800HT Sheets & Plates Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier of Incoloy 800/800H/800HT sheets and plates based in Mumbai, India. These products comply with ASTM B409 / ASME SB-409 standards and are nickel‑iron‑chromium alloys designed for prolonged high‑temperature service, offering excellent resistance to oxidation, carburisation, and creep failure.
The Incoloy 800 family is built on an iron-based matrix (minimum 39.5% Fe, 30-35% Ni, 19-23% Cr), making it a more economical option than nickel‑base Inconel grades for flat products used below 982°C. Alloy 800 (UNS N08800, W.Nr 1.4876) is typically used up to 593°C. Incoloy 800H (UNS N08810, W.Nr 1.4958) carefully controls carbon to 0.05-0.10% and requires an ASTM No. 5 or coarser grain size for reliable creep service to 899°C. Alloy 800HT (UNS N08811, W.Nr 1.4959) further tightens the aluminium plus titanium content to 0.85-1.20% to maximise creep‑rupture strength above 700°C. Today, most stock is dual‑certified to both N08810 and N08811, covering 800H and 800HT in one material.
Available in sheet (0.5-6.0 mm) and plate (6.0-75 mm) with widths from 1000-2500 mm and lengths from 2000-6000 mm. Supplied as hot rolled plate, cold rolled sheet, strip, coil, foil, shim, clad plate, and perforated sheet in No.1, 2B, 2D, BA, and No.4 finishes. Used in petrochemical, power generation, heat treatment, and nuclear industries. ISO 9001 / ISO 14001 certified, with EN 10204/3.1B MTC, PMI, and full traceability.
Alloy 800 Sheet & Plate Specifications
Specifications define dimensional ranges, heat treatments, grain size requirements, and mechanical property criteria for Alloy 800, 800H, and 800HT sheets and plates:
| Standard | ASTM B409 / ASME SB409 |
|---|---|
| AMS | 5871 |
| Sheet Thickness | 0.5-6.0 mm |
| Plate Thickness | 6.0-75 mm |
| Heat Treatment | Anneal 982°C |
| Length | 2000mm, 2440mm (8ft), 3000mm, 5800mm, 6000mm, or customized. |
| Process | Hot Rolled (HR), Cold Rolled (CR) |
| Forms | Sheet, Plate, Strip, Coils, Foils, Shim Sheet. |
Nicorex Alloys stocks dual-certified 800H/HT material. Custom sizes, cut-to-length plates, and narrow-width strips available on request.
Chemical Composition of Nickel Alloy 800/H/HT Sheet and Plate
Chemical composition is specified according to ASTM B409 in weight per cent (wt%), defining allowable element ranges for Alloy 800 series:
| Element | Nickel | Chromium | Iron | Carbon | Titanium | Aluminium | Al + Ti |
|---|---|---|---|---|---|---|---|
| N08800 | 30.0-35.0 | 19.0-23.0 | 39.5 min | 0.10 max | 0.15-0.60 | 0.15-0.60 | N/A |
| N08810 | 30.0-35.0 | 19.0-23.0 | 39.5 min | 0.05-0.10 | 0.15-0.60 | 0.15-0.60 | 0.30-1.20 |
| N08811 | 30.0-35.0 | 19.0-23.0 | 39.5 min | 0.06-0.10 | 0.25-0.60 | 0.25-0.60 | 0.85-1.20 |
Controlled carbon in Alloy 800H promotes M₂₃C₆ carbide precipitation at grain boundaries; this pinning mechanism resists grain-boundary sliding during creep. The tighter Al+Ti in Incoloy 800HT adds γ′ (Ni₃(Al, Ti)) intermetallic precipitates, a second creep-strengthening mechanism above 700°C. The Fe-base matrix (39.5% min) reduces raw material cost versus Ni-base Inconel grades while maintaining adequate high-temperature performance.
Mechanical Properties of Alloy 800 Sheet & Plate
Room-temperature strength across the Alloy 800 family varies based on the applied heat treatment and the resulting grain size:
| Property | Tensile Strength (min) | Yield 0.2% Offset (min) | Elongation (min) | Density | Melting Range |
|---|---|---|---|---|---|
| 800 (Anneal 982°C) | 517 MPa (75 ksi) | 207 MPa (30 ksi) | 30% | 7.94 g/cm³ | 1357-1385°C (2475-2525°F) |
| 800H/HT (Sol. Ann. 1149°C) | 448 MPa (65 ksi) | 172 MPa (25 ksi) |
Incoloy 800 has higher room-temperature strength because its 982°C anneal produces finer grains. Alloy 800H/HT has lower room-temperature strength because the 1149°C solution anneal produces coarser grains (ASTM No. 5+). Those coarser grains give UNS N08810/N08811 superior creep-rupture strength at elevated temperature. ASME Sec. VIII Div. 1 approves 800H plate to 816°C (1500°F); Code Case 1983 extends this to 982°C (1800°F).
International Equivalent Designations for UNS N08800 Sheet & Plate
Below are the international equivalent designations for Incoloy 800, 800H, and 800HT, including UNS, Werkstoff, ASTM/ASME, EN/DIN, and nuclear codes:
| Standard | UNS | Werkstoff | EN/DIN | JIS |
|---|---|---|---|---|
| 800 | N08800 | 1.4876 | X10NiCrAlTi32-21 | NCF 800 |
| 800H | N08810 | 1.4958 | X8NiCrAlTi32-21 | NCF 800H |
| 800HT | N08811 | 1.4959 | X8NiCrAlTiNb32-21 | NCF 800HT |
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Available Forms of Incoloy 800 Sheet & Plate
All three variants are stocked in these forms:
Incoloy 800 Hot Rolled Plate
Incoloy 800H Cold Rolled Sheet
Incoloy 800HT Strip
Incoloy 800 Coil
Incoloy Alloy 800 Foil
Incoloy 800 HT Shim Sheet
Incoloy 800 Perforated Sheet
Incoloy 800H Clad Plate
Corrosion Resistance of Incoloy 800H & 800HT Flat Products
Alloy 800H and 800HT sheet and plate resist oxidation, carburisation, nitriding, and sulfidation across 600-1000°C. In ethylene cracker and steam methane reformer environments, 19-23% Cr forms a stable Cr₂O₃ oxide layer while 30-35% Ni stabilises the austenitic matrix against carbon ingress. This dual defence allows UNS N08810 to resist carburisation far more effectively than 300-series stainless steels.
304/316 SS fail by sigma-phase embrittlement at 650-870°C and by chloride SCC (only 8-14% Ni). Nickel Alloy 800H/HT remains ductile and stable in this exact range. Inconel 600 (72% Ni) is superior above 982°C and in caustic service, but costs 2-3× more. For most applications below 982°C, the Alloy 800 family delivers equivalent performance at lower cost. 800HT provides higher allowable stresses than 800H above 700°C per ASME Sec. VIII.
Industrial Applications of Alloy 800H Sheets & Plates
Incoloy 800H/800HT sheets and plates deliver reliable, high-temperature performance across petrochemical, power, heat treatment, nuclear, and chemical industries.
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Petrochemical Processing: Alloy 800H plates serve as ethylene cracker outlet header plates, reformer collector tubesheets, and transfer line exchanger supports. Carburisation resistance of UNS N08810 is critical in carbon-rich cracking atmospheres above 800°C.
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Power Generation: Incoloy 800HT plates are specified for superheater/reheater tubesheets, baffle plates, and boiler structural supports. Creep-rupture strength of UNS N08811 suits dead-weight loads at elevated temperature.
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Heat Treatment Furnaces & Fixtures: W.Nr 1.4958/1.4959 plates are cut into radiant tubes, muffles, retorts, annealing covers, and basket fixtures. These resist simultaneous oxidation and carburisation in endothermic/exothermic gas atmospheres without sigma-phase embrittlement.
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Nuclear Energy: UNS N08810/N08811 plates are approved under ASME Sec. III (Code Cases N-201, N-253, N-254) for steam generator tubesheets in gas-cooled reactors and nuclear fuel processing heat exchangers. Long-term thermal stability suits 30+ year design lives.
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Chemical & Fertiliser Industry: Alloy 800 sheets handle nitric acid catalyst grids, ammonia plant exchangers, and urea reactor linings. Above 593°C, specify 800H or 800HT for creep performance.
How to Order Incoloy 800 Sheets & Plates from Nicorex Alloys
To order Incoloy 800 Sheets & Plates, please provide the following details.
- Product Form - (Sheet, Plate, Strip, Coil, Foil)
- Grade - (Incoloy 800 / 800H / 800HT)
- Thickness - (specify mm)
- Width × Length - (standard or custom cut)
- Quantity - (in kg, MT, or number of sheets)
- Condition - (Annealed, Solution Annealed)
- Edge Type - (Mill, Slit, Sheared)
- Standard - (ASTM B409 / ASME SB409)
- Additional Testing - (TPI, NACE, PMI, UT)
- Packaging Requirements - (standard, export-grade, wooden case)
- Delivery Destination - (domestic / export)
Frequently Asked Questions
What is the Difference Between Incoloy 800, 800H, and 800HT?
Same Ni-Fe-Cr base, different carbon and Al+Ti controls. 800 (N08800): C ≤0.10%, no grain size requirement, to 593°C. 800H (N08810): C 0.05-0.10%, grain ≥ASTM No. 5, to 899°C. 800HT (N08811): Al+Ti 0.85-1.20%, maximum creep strength above 700°C. 800HT chemistry always falls within 800H limits, enabling dual certification.
Is Incoloy the Same as Inconel?
No. INCOLOY is iron-based (Fe 39.5% min, Ni 30-35%). INCONEL is nickel-base (Ni 58-72%). The Fe-base composition of Incoloy 800 makes it significantly more cost-effective for applications where its performance is sufficient.
Which ASTM Standard covers Nickel Alloy 800H Sheets?
ASTM B409 / ASME SB-409 covers all three variants (N08800, N08810, N08811) in sheet, plate, and strip. AMS 5871 is the aerospace spec. ASTM B407 covers seamless pipe.
What Filler Metal for Welding Alloy 800H Plates?
What is the Maximum Service Temperature?
ASME Sec. VIII Div. 1 approves 800H plate to 816°C (1500°F). Code Case 1983 extends to 982°C. UNS N08811 provides higher allowable stresses than N08810 above 700°C.
What Sizes of UNS N08810 Plates does Nicorex Alloys Stock?
Dual-certified Alloy 800H/HT plates from 6 to 50 mm thick, widths up to 2500 mm, lengths up to 6000 mm. Sheets from 0.5 mm. CNC plasma, waterjet, and laser cutting with full traceability per EN 10204/3.1B.
What Thickness Range is Available for Incoloy 800 Sheet?
Sheets: 0.5 to 6.0 mm. Plates: 6.0 to 75 mm. Custom thicknesses on request.