Incoloy 800H (N08810)

Grade: Incoloy 800H

Choose your grade

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

What is Incoloy 800H and its applications?

Incoloy 800H (UNS N08810) is a controlled-carbon iron-nickel-chromium alloy processed for creep and rupture strength. Published applications include reforming equipment, furnace parts and high-temperature heat exchangers.

Hydrocarbon processing: Reformer and cracking equipment.
Industrial furnaces: Radiant tubes, muffles and fixtures.
Heat exchangers: Components requiring long-term hot-service properties.

Compare materials ↗Technical source ↗

Choose your 800H product

Engineering Application & Selection Guide

Controlled carbon and high-temperature annealing produce the grain structure used to develop its creep properties. Compliance requires the relevant chemistry, thermal processing and grain-size requirements, not simply an 800-family composition.

Incoloy 800H stud bolts — For heated process flanges, request the specified condition and grain-size evidence with the material records.
Incoloy 800H hex bolts — For furnace supports, include differential movement, thermal gradients and load duration in the joint review.
Incoloy 800H socket head cap screws — For restricted-access fixtures, evaluate stress relaxation before defining installation preload.

Compare 800H and 800HT against the actual specification and service duty. Standard 800 cannot automatically substitute for 800H; the reverse also requires checking fabrication and property requirements.

Get a Quote Technical sources ↓

Incoloy 800H Composition

Composition limits · wt.%

ElementWeight %

Ni: 30–35%
Cr: 19–23%
Fe: ≥39.5%
C: 0.05–0.10%
Mn: ≤1.5%
S: ≤0.015%
Si: ≤1.0%
Cu: ≤0.75%
Al: 0.15–0.60%
Ti: 0.15–0.60%

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 800H 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 800H 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 800H Physical Properties

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

Temperature curves and values

Incoloy 800H 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 800H 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.

Upload Drawing