Incoloy 800HT (N08811)

Grade: Incoloy 800HT

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Each grade retains its own composition, condition and specification requirements.

What is Incoloy 800HT and its applications?

Incoloy 800HT (UNS N08811) is a restricted-composition member of the 800 family used in equipment exposed to prolonged elevated temperatures. Its applications include reforming, industrial heating and high-temperature heat transfer.

Reforming equipment: Components carrying sustained loads at elevated temperature.
Industrial heating: Furnace fixtures and thermal-processing hardware.
Heat transfer: Parts with a defined creep-design basis.

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Choose your 800HT product

Engineering Application & Selection Guide

Controlled carbon and aluminum-plus-titanium limits, together with high-temperature annealing and grain-size control, support its creep and rupture properties. These requirements distinguish N08811 from a general N08810 material callout.

Incoloy 800HT stud bolts — For process flanges, specify N08811 and the required final condition explicitly.
Incoloy 800HT hex bolts — For heated supports, assess thread-root stresses and sustained-load behavior.
Incoloy 800HT socket head cap screws — For furnace tooling, document the manufacturing sequence and verify the final condition and dimensions.

Compare 800H and 800HT using the governing specification and design data. Certification to N08810 alone does not demonstrate N08811 compliance. Any manufacturing heat treatment must follow the applicable requirements rather than an assumed universal post-cold-work cycle.

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Incoloy 800HT Composition

Composition limits · wt.%

ElementWeight %

Ni: 30–35%
Cr: 19–23%
Fe: ≥39.5%
C: 0.06–0.10%
Mn: ≤1.5%
S: ≤0.015%
Si: ≤1.0%
Cu: ≤0.75%
Al: 0.25–0.60%
Ti: 0.25–0.60%
Al + Ti: 0.85–1.20%

ASTM / ASME specifications by product form

Finished-product requirements

Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.

Incoloy 800HT hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Rod & bar	ASTM B408 / ASME SB408
Forgings	ASTM B564 / ASME SB564
Plate, sheet & strip	ASTM B409 / B906 · ASME SB409 / SB906 · ASTM A240 / A480 · ASME SA240 / SA480
Seamless pipe & tube	ASTM B407 / B829 · ASME SB407 / SB829
Heat-exchanger tube	ASTM B163 / ASME SB163
Welded tube	ASTM B515 / B751 · ASME SB515 / SB751
Welded pipe	ASTM B514 / B775 · ASME SB514 / SB775
Fittings	ASTM B366 / ASME SB366

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

How to specify round bar, plate, wire and strip ↗

Incoloy 800HT Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥450 MPa
0.2% yield strength	≥170 MPa
Elongation	≥30%

Supplied technical reference · Scanned PDF page 3 · printed page 15

Incoloy 800HT Physical Properties

Property	Value	Unit
Density	7.94	g/cm³
Melting range	1357–1385	°C

Temperature curves and values

Incoloy 800HT Tensile strength, Yield strength versus temperature; Shared 800H / 800HT catalogue reference; MPa and degrees Celsius — Tensile and yield strength
Shared 800H / 800HT catalogue reference

Incoloy 800HT Elongation versus temperature; Shared 800H / 800HT catalogue reference; percent and degrees Celsius — Elongation vs temperature
Shared 800H / 800HT catalogue reference

Procurement and application guide

Specify the material and final condition

800, 800H and 800HT have distinct chemistry and condition requirements.

Material forms in the technical reference: Round bar · Flat bar · Wire · Plate · Sheet · Strip · Pipe & tube · Forging stock · Hexagon & sections.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

Start with the information you have

Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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