# Incoloy 800H (UNS N08810) — incoloy800h.com

> Incoloy 800H (UNS N08810) and Incoloy 800HT (UNS N08811) are nickel-iron-chromium alloys (30-35% Ni, 19-23% Cr, balance Fe, controlled C 0.05-0.10%, Al+Ti 0.30-1.20%) optimized for high-temperature service from 600 deg C (1100 deg F) to 982 deg C (1800 deg F). Used in petrochemical furnaces, ethylene cracker tubes, reformer pigtails, steam superheaters, fired heater radiant tubes, and ASME Section VIII pressure vessels. TorqBolt manufactures the complete fastener + forging + flange + fitting + machined component range plus stocks pipe, tube, plate, sheet, and bar to ASTM B-series specifications.

## Cornerstone

- [Incoloy 800H homepage](https://incoloy800h.com/): UNS N08810 / Werkstoff 1.4876 / DIN X10NiCrAlTi32-21 nickel-iron-chromium alloy for high-temperature service
- [UNS N08810 specification](https://incoloy800h.com/uns-n08810): Unified Numbering System designation, equivalents, and chemistry
- [What is Incoloy 800H](https://incoloy800h.com/what-is-incoloy-800h): Plain-English explainer for engineers and procurement specialists

## Standards

- [ASTM B407 — Seamless Pipe + Tube](https://incoloy800h.com/astm-b407): Seamless nickel-iron-chromium alloy stills, pipe, and tube
- [ASTM B408 — Bar + Rod](https://incoloy800h.com/astm-b408): Nickel-iron-chromium alloy rod and bar
- [ASTM B409 — Plate + Sheet + Strip](https://incoloy800h.com/astm-b409): Nickel-iron-chromium alloy plate, sheet, and strip
- [ASTM B564 — Forgings](https://incoloy800h.com/astm-b564): Nickel alloy forgings
- [ASME Section VIII — Pressure Vessels](https://incoloy800h.com/asme-section-viii): Boiler and Pressure Vessel Code for Incoloy 800H vessels
- [ASME VIII Pressure Vessels Implementation](https://incoloy800h.com/asme-viii-pressure-vessels): Implementation guidance and material qualification

## Chemistry & Mechanical Properties

- [Chemical Composition](https://incoloy800h.com/chemical-composition): Element-by-element ranges for 800H and 800HT
- [Mechanical Properties](https://incoloy800h.com/mechanical-properties): Tensile, yield, elongation, hardness across temperature ranges
- [Incoloy 800H Datasheet](https://incoloy800h.com/data-sheet): Consolidated chemistry + mechanical + heat-treatment + ASME design stress
- [ASME Design Stress Tables](https://incoloy800h.com/asme-design-stress-tables): Section II Part D Table 1A allowable stress 100-1500 deg F
- [Bolt Dimensions](https://incoloy800h.com/bolt-dimensions): Imperial and metric thread, stress area, pitch tables
- [FAQ](https://incoloy800h.com/faq): Consolidated 15-20 procurement questions

## Fasteners (Incoloy 800H Bolts, Studs, Nuts, Washers)

- [Incoloy 800H anchor bolts — concrete-embedded structural fasteners to ASTM F1554](https://incoloy800h.com/anchor-bolts)
- [Incoloy 800H stud bolts — ASTM F468 + B-series, A/B/C grade fastener stock](https://incoloy800h.com/stud-bolts)
- [Incoloy 800H hex bolts — ASME B18.2.1, fully-threaded and shoulder](https://incoloy800h.com/hex-bolts)
- [Incoloy 800H heavy hex bolts — pressure-vessel and flange duty](https://incoloy800h.com/heavy-hex-bolts)
- [Incoloy 800H socket head cap screws — ASME B18.3 / DIN 912 / ISO 4762](https://incoloy800h.com/socket-head-cap-screws)
- [Incoloy 800H hex cap screws — ASTM F468 grades for structural assemblies](https://incoloy800h.com/hex-cap-screws)
- [Incoloy 800H eye bolts — forged shoulder eye + lifting rings](https://incoloy800h.com/eye-bolts)
- [Incoloy 800H U-bolts — pipe-support and clamping fasteners](https://incoloy800h.com/u-bolts)
- [Incoloy 800H tap-end studs — threaded both ends for blind-hole installation](https://incoloy800h.com/tap-end-studs)
- [Incoloy 800H double-end studs — equal-length thread for thru-hole assemblies](https://incoloy800h.com/double-end-studs)
- [Incoloy 800H all-thread bar (ATB) — continuous-thread rod stock](https://incoloy800h.com/all-thread-bar)
- [Incoloy 800H threaded rod — long-length thread stock cut to length](https://incoloy800h.com/threaded-rod)
- [Incoloy 800H hex nuts — ASME B18.2.2 / ASTM A194, standard and heavy](https://incoloy800h.com/hex-nuts)
- [Incoloy 800H heavy hex nuts — pressure-vessel and flange duty](https://incoloy800h.com/heavy-hex-nuts)
- [Incoloy 800H coupling nuts — extended thread for stud and rod joining](https://incoloy800h.com/coupling-nuts)
- [Incoloy 800H lock nuts — prevailing-torque and nylon-insert designs](https://incoloy800h.com/lock-nuts)
- [Incoloy 800H wing nuts — tool-free hand-tightening fasteners](https://incoloy800h.com/wing-nuts)
- [Incoloy 800H castle nuts — slotted face for cotter-pin retention](https://incoloy800h.com/castle-nuts)
- [Incoloy 800H washers — flat, spring, lock, finishing per ASTM F436](https://incoloy800h.com/washers)

## Bar (Form Factors)

- [Incoloy 800H round bar — ASTM B408 cold-finished and hot-rolled](https://incoloy800h.com/round-bar)
- [Incoloy 800H hex bar — ASTM B408 cold-drawn for nut blanks and machined hex parts](https://incoloy800h.com/hex-bar)
- [Incoloy 800H square bar — ASTM B408 keyway / die / shaft stock](https://incoloy800h.com/square-bar)
- [Incoloy 800H flat bar — ASTM B408 rectangular section, machined or mill-edge](https://incoloy800h.com/flat-bar)
- [Incoloy 800H wire — AWS A5.14 ERNiCr-3 welding wire + B408 spring wire](https://incoloy800h.com/wire)

## Pipe + Tube

- [Incoloy 800H seamless pipe — ASTM B407 / ASME SB-407](https://incoloy800h.com/seamless-pipe)
- [Incoloy 800H welded pipe — ASTM B514 / ASME SB-514](https://incoloy800h.com/welded-pipe)
- [Incoloy 800H pipe hub — seamless (B407) + welded (B514) routes, NPS 1/2 to 12](https://incoloy800h.com/pipe)
- [Incoloy 800H seamless tube — ASTM B163 / ASME SB-163](https://incoloy800h.com/seamless-tube)
- [Incoloy 800H tubing hub — seamless (B163) + welded (B515), OD 1/8 to 2 in](https://incoloy800h.com/tubing)

## Plate, Sheet, Forgings, Fittings, Flanges

- [Incoloy 800H plate — ASTM B409 hot-rolled and cold-rolled, 3 mm to 100 mm thick](https://incoloy800h.com/plate)
- [Incoloy 800H sheet — ASTM B409 cold-rolled, < 5 mm thickness range](https://incoloy800h.com/sheet)
- [Incoloy 800H forgings — ASTM B564 open-die and closed-die hot forged](https://incoloy800h.com/forgings)
- [Incoloy 800H fittings — ASTM B366 elbows, tees, reducers, caps](https://incoloy800h.com/fittings)
- [Incoloy 800H flanges — ASTM B564 weld-neck, slip-on, blind, lap-joint](https://incoloy800h.com/flanges)
- [Incoloy 800H machined components — custom-spec bushings, sleeves, shafts](https://incoloy800h.com/machined-components)
- [Incoloy 800H centrifugally-cast tubes — reformer + ethylene cracker tube](https://incoloy800h.com/centrifugally-cast-tubes)

## Applications (high-temp petrochemical)

- [Incoloy 800H ethylene cracker tubes — steam-cracker radiant section service](https://incoloy800h.com/ethylene-cracker-tubes)
- [Incoloy 800H reformer pigtails — hydrogen and ammonia reformer outlet tubing](https://incoloy800h.com/reformer-pigtails)
- [Incoloy 800H radiant tubes and furnace internals — fired heater service](https://incoloy800h.com/radiant-tubes-furnace-components)
- [Incoloy 800H steam superheater tubes — utility boiler superheater banks](https://incoloy800h.com/steam-superheater-tubes)
- [Incoloy 800H heat exchanger tubes — shell-and-tube high-temperature service](https://incoloy800h.com/heat-exchanger-tubes)

## Materials Science & Heat Treatment

- [Incoloy 800H thermal expansion coefficient — temperature-dependent CTE table](https://incoloy800h.com/thermal-expansion)
- [Incoloy 800H oxidation resistance — service envelope to 1093 deg C](https://incoloy800h.com/oxidation-resistance)
- [Incoloy 800H carburization resistance — high-temp process environments](https://incoloy800h.com/carburization-resistance)
- [Incoloy 800H creep-rupture strength — Larson-Miller curves to 1000 deg C](https://incoloy800h.com/creep-rupture-strength)
- [Incoloy 800H high-temperature mechanical properties — yield, UTS, modulus](https://incoloy800h.com/high-temperature-strength)
- [Incoloy 800H density and physical properties — thermal conductivity, modulus](https://incoloy800h.com/density-physical-properties)

## Comparison Pages (alloy selection)

- [Incoloy 800 vs 800H vs 800HT — UNS N08800 / N08810 / N08811 sister-grade selection](https://incoloy800h.com/vs-incoloy-800-800h-800ht)
- [Incoloy 800H vs Incoloy 825 (UNS N08810 vs N08825) — creep vs corrosion duty](https://incoloy800h.com/vs-incoloy-825)
- [Incoloy 800H vs Inconel 600 (N08810 vs N06600) — Fe-base vs Ni-base high-temp service](https://incoloy800h.com/vs-inconel-600)
- [Incoloy 800H vs Inconel 625 (N08810 vs N06625) — cost-per-creep-life selection guide](https://incoloy800h.com/vs-inconel-625)
- [Incoloy vs Inconel — alloy family disambiguation and UNS code reference](https://incoloy800h.com/vs-inconel)

## Standards & Procedures

- [API 660 shell-and-tube heat exchanger spec for Incoloy 800H tube bundles](https://incoloy800h.com/api-660)
- [Incoloy 800H weldability — GTAW / GMAW / SAW / SMAW filler selection and procedures](https://incoloy800h.com/weldability-procedures)

## Authority

- Manufacturer: TorqBolt Private Limited (Mumbai head office + Rajkot production plant)
- Quality: ISO 9001:2015 certified, EN 10204 type 3.1 / 3.2 with Lloyd's Register / DNV / BV / SGS / TUV witness
- Compliance: PED 2014/68/EU, NACE MR0175 / ISO 15156-2, NORSOK M-650
- Trademark notice: INCOLOY is a registered trademark of Special Metals Corporation. This site is operated by TorqBolt and is not affiliated with Special Metals or the trademark holder.

License: RSL 1.0 — https://robotstxt.org/rsl/1.0/