Incoloy 800H Plates | ASTM B409 UNS N08810 Creep-Rupture Excellence
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When a Middle East ethylene cracker lost $2.5M to furnace tube failures after 18 months due to creep deformation at 1050°C, operators rejected standard Incoloy 800 plates and specified Incoloy 800H Plates achieving 4x longer service life with 50% higher rupture strength thanks to controlled carbon (0.05-0.10%) and coarse grain structure. Petrochemical engineers, power plant procurement heads, and OEM fabricators now demand these enhanced nickel-iron-chromium plates (UNS N08810) where base Alloy 800 suffers dimensional instability under prolonged heat and stress.
Incoloy 800H delivers minimum tensile strength of 448 MPa and yield of 172 MPa after high-temperature annealing (>ASTM 5 grain size), providing 2-3x better creep-rupture life than Alloy 800 in the critical 650-1100°C range used by superheaters, reformers, and ethylene furnaces. Unlike stainless 310 or basic 800, the precise C/Al/Ti control in 800H prevents embrittlement while maintaining oxidation resistance superior to SS 321 in cyclic service.
Aurico Alloys LLP provides affordable, authentic Incoloy 800H Plates as trusted supplier, manufacturer, and stockist for chemical, oil & gas, marine, pharma, power industries, and hardware stores with full EN10204 3.1 MTC certification. As premier Incoloy 800H Plates supplier, stockist, exporter in India to abroad, we serve Mumbai-based OEMs with immediate stock for Incoloy 800H plate suppliers in Mumbai for superheater and reheater tubing supports and global petrochemical projects.
High-quality Incoloy 800H Plates ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP - Incoloy 800H plate exporters in Mumbai |
|---|---|
| Grade | Incoloy 800H (UNS N08810, 1.4958) |
| Standards | ASTM B409/ASME SB409, ASTM B906, DIN 17460 |
| Thickness Range | 4.75 mm – 150 mm |
| Width/Length | 1000-2500mm width, up to 6000mm length |
| Finish | Hot-rolled, annealed (>ASTM 5 grain), pickled |
| Delivery | Mumbai stock, custom cut, MTC 3.1, export ready |
| Price | INR 1,500 – 2,000 per kg. Indicative USD 18 – 24 per kg; quoted against grade, form, size and quantity. |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N08810 |
| Werkstoff / EN number | 1.4958 |
| EN designation | X5NiCrAlTi31-20 |
| Density | 7.94 g/cm3 |
| Melting range | 1357-1385 °C |
| Specific heat (0-100 °C) | 460 J/kg·°C |
| Magnetic permeability (200 oersted at 21 °C - annealed) | 1.014 |
| Magnetic permeability (200 oersted at 21 °C - hot-rolled) | 1.009 |
| Curie temperature | -115 °C |
| Plate, sheet and strip specification | ASTM B409 / B906 |
Identifiers and physical constants for Incoloy 800H. A dash means no such designation is published for this grade.
Stock & Product Availability
ASTM B409 Incoloy 800H plates for high-temperature nuclear power plant components stocked for immediate dispatch, alongside Incoloy 800H plate price in Mumbai for thermal power plant heat treatment fixtures at competitive market rates. High creep-strength Alloy 800H plates for industrial furnace muffles and retorts available with verified coarse grain structure certification.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 30.0 | 35.0 |
| Chromium (Cr) | 19.0 | 23.0 |
| Iron (Fe) | 39.5 | — |
| Carbon (C) | 0.05 | 0.10 |
| Aluminium (Al) | 0.15 | 0.60 |
| Titanium (Ti) | 0.15 | 0.60 |
| Aluminium + Titanium (Al+Ti) | 0.30 | 1.20 |
| Manganese (Mn) | — | 1.5 |
| Silicon (Si) | — | 1.0 |
| Copper (Cu) | — | 0.75 |
| Sulfur (S) | — | 0.015 |
Composition limits for Incoloy 800H. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical Properties
| Property | Annealed 800H (Typical) |
|---|---|
| Tensile Strength (MPa/ksi) | ≥448 / 65 |
| Yield Strength 0.2% (MPa/ksi) | ≥172 / 25 |
| Elongation (%) | ≥30 |
| Hardness (HB) | ≤200 |
| Grain Size | >ASTM 5 |
| Max Service Temp | 1100°C continuous |
Applications & Benefits
Why this grade
Incoloy 800H shares the chemistry of 800 with two deliberate changes: carbon is controlled to 0.05–0.10% and the solution anneal is carried out at a higher temperature to give a coarser grain. Both raise creep and stress-rupture strength, which is why 800H rather than 800 is the grade for ASME pressure service above 650°C.
- Power Generation: Incoloy 800H plate suppliers in Mumbai for superheater and reheater tubing supports; superior creep resistance vs Alloy 800.
- Petrochemical: Corrosion resistant Incoloy 800H plates for ethylene furnace pigtails and headers, Incoloy 800H plate stockist in Mumbai for hydrocarbon cracking and reformer tubes.
- Chemical: UNS N08810 Incoloy plates for ammonia synthesis and chemical reactor internals; resists carburization better than SS310.
- Marine/Oil&Gas: Marine grade Incoloy 800H plates for specialized offshore high-heat flare tips, Incoloy 800H plate stockholders in Maharashtra for gas turbine combustion liners.
- Pharma/Fabrication: High-purity Incoloy 800H plates for pharmaceutical high-temperature sterilization reactors; custom cut Incoloy 800H plate sizes for specialty chemical laboratory equipment.
- Sourcing: Verified Incoloy 800H plate exporters in India with Mill Test Certificates (MTC) 3.1; leading Incoloy 800H alloy plate dealers in Mumbai for cryogenic to 1100°F applications.
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Incoloy 800H plates from Aurico Alloys LLP provide unmatched ASTM B409/UNS N08810 creep-rupture performance and code compliance critical upgrade over base alloys for chemical, petrochemical, power, marine applications where downtime costs millions, as India's leading Incoloy 800H plate supplier, stockist, exporter with ready Mumbai inventory. Are your high-temperature assets protected by 800H's proven long-term reliability?