Incoloy 800HT Plates | ASTM B409 UNS N08811 Maximum Creep Performance
Table of Contents:
When a Saudi Aramco ethylene plant faced $8M in unplanned shutdowns from reformer tube ruptures at 1120°C after only 22 months, they upgraded from Incoloy 800H to Incoloy 800HT Plates delivering 6x longer rupture life through optimized Al+Ti (1.0-1.7%) and stabilized carbide precipitation that prevents grain boundary creep failure. Power plant engineers, petrochemical procurement managers, and nuclear OEMs now specify these ultimate-strength nickel-iron-chromium plates (UNS N08811) where even 800H shows unacceptable deformation under prolonged ultra-high temperature/stress.
Incoloy 800HT achieves minimum tensile strength of 520 MPa and yield of 240 MPa post-solution anneal at 1140-1180°C plus stabilizing at 980°C, providing 30-50% higher creep-rupture strength than 800H in the 900-1150°C range critical for quench boilers and nuclear steam generators. The elevated Al+Ti range (1.0-1.7%) forms stable carbides that anchor grain boundaries against sliding, while maintaining oxidation resistance superior to all other 800-series alloys.
Aurico Alloys LLP delivers affordable, authentic Incoloy 800HT Plates as the trusted supplier, manufacturer, and stockist for chemical, oil & gas, marine, pharma, power industries, and hardware stores with complete ASTM B409/ASME SB409 compliance and EN10204 3.1 certification. As leading Incoloy 800HT Plates supplier, stockist, exporter in India to abroad, we maintain Mumbai inventory for Incoloy 800HT plate suppliers in Mumbai for ethylene furnace quench boilers and global nuclear projects.
High-quality Incoloy 800HT Plates ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP - Incoloy 800HT plate exporters in Mumbai |
|---|---|
| Grade | Incoloy 800HT (UNS N08811, 1.4959) |
| Standards | ASTM B409/ASME SB409, DIN 17460, VdTÜV 412 |
| Thickness Range | 4.75 mm – 150 mm |
| Width/Length | 1000-3000mm width, up to 8000mm length |
| Finish | Solution annealed 1140-1180°C + stabilized 980°C |
| Delivery | MTC 3.1, PMI, grain size certification, export packed |
| 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 | N08811 |
| Werkstoff / EN number | 1.4959 |
| EN designation | X8NiCrAlTi32-21 |
| 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 800HT. A dash means no such designation is published for this grade.
Stock & Product Availability
ASTM B409 UNS N08811 plates for hydrocarbon cracking and reformer components with verified stabilized heat treatment, plus Incoloy 800HT plate price per kg in Mumbai for thermal power plant pressure vessels at competitive rates. High-temperature corrosion resistant Alloy 800HT plates for chemical reactor internals ready for immediate fabrication.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 30.0 | 35.0 |
| Chromium (Cr) | 19.0 | 23.0 |
| Iron (Fe) | 39.5 | — |
| Carbon (C) | 0.06 | 0.10 |
| Aluminium (Al) | 0.25 | 0.60 |
| Titanium (Ti) | 0.25 | 0.60 |
| Aluminium + Titanium (Al+Ti) | 0.85 | 1.20 |
| Manganese (Mn) | — | 1.5 |
| Silicon (Si) | — | 1.0 |
| Copper (Cu) | — | 0.75 |
| Phosphorus (P) | — | 0.045 |
| Sulfur (S) | — | 0.015 |
Composition limits for Incoloy 800HT. 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 | 800HT Stabilized (Min Values) |
|---|---|
| Tensile Strength (MPa/ksi) | ≥520 / 75 |
| Yield Strength 0.2% (MPa/ksi) | ≥240 / 35 |
| Elongation (%) | ≥30 |
| Creep Strength @1000h | >2x 800H @1100°C |
| Rupture Strength | >6x 800 @1120°C |
| Max Service Temp | 1150°C continuous |
Applications & Benefits
Why this grade
Incoloy 800HT carries the controlled carbon of 800H and additionally holds aluminium plus titanium to 0.85–1.20%. That extra control lifts creep-rupture strength again and takes useful service to around 925°C — the reason steam reformer and ethylene pyrolysis tubing is specified in 800HT rather than 800H.
- Petrochemical: Incoloy 800HT plate exporters in Mumbai for petrochemical waste heat recovery units; ASTM B409 UNS N08811 plates for hydrocarbon cracking.
- Power/Nuclear: Creep resistant Incoloy 800HT plates for superheater and reheater tubing supports; ASME SB409 Alloy 800HT plates for nuclear power plant steam generator heat exchangers.
- Chemical: Solution annealed Incoloy 800HT plates for high-stress power generation components; resists sulfidation/carburization.
- Marine/Oil&Gas: Marine grade Incoloy 800HT plates for offshore oil platform flare tip assemblies; Incoloy 800HT plate stockist in Mumbai for subsea thermal recovery.
- Pharma/Fabrication: High-purity Incoloy 800HT plates for pharmaceutical high-temperature autoclave fabrication; custom cut-to-size Incoloy 800HT plates for specialty industrial furnace baskets.
- Sourcing: Leading Incoloy 800HT plate stockholders in India with MTC 3.1 certification; Incoloy 800HT cold rolled (CR) plates for precision laboratory equipment in Mumbai.
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 800HT plates from Aurico Alloys LLP represent the pinnacle of ASTM B409/UNS N08811 creep-rupture technology essential upgrade for ethylene crackers, nuclear plants, and ultra-high temperature process equipment where failure costs exceed material price many times over. Are your most demanding 1100°C+ applications protected by 800HT's unmatched stabilized performance?