Incoloy 800 (N08800) Fasteners & Material Enquiries

Grade: Incoloy 800

Choose your grade

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

What is Incoloy 800 and its applications?

Incoloy 800 (UNS N08800) is an iron-nickel-chromium alloy used in furnace equipment, petrochemical heating systems and electrical heating-element sheaths. Its selection combines resistance to hot-gas corrosion with the required mechanical performance.

Industrial furnaces: Retorts, supports and heat-processing components.
Petrochemical heating: Cracker tubes, pigtails and headers.
Electrical heating: Sheathing and associated thermal hardware.

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Choose your 800 product

Engineering Application & Selection Guide

Its austenitic matrix and chromium-nickel chemistry support heat resistance. Incoloy 800 is not specified as a conventional age-hardening alloy; the applicable delivery and thermal condition must still be defined.

Incoloy 800 hex bolts — For furnace covers, calculate bolt temperature and thermal movement rather than relying on furnace air temperature.
Incoloy 800 stud bolts — For heated flanges, establish the required condition and temperature-dependent load capacity.
Incoloy 800 socket head cap screws — For removable thermal fixtures, agree thread clearance and a lubricant compatible with the exposure.

Compare 800, 800H and 800HT where sustained loading makes creep important. There is no universal temperature at which every 800 joint must be upgraded. Apply the actual product specification, design stress and service duration.

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Incoloy 800 Composition

Composition limits · wt.%

ElementWeight %

Ni: 30–35%
Cr: 19–23%
Fe: ≥39.5%
C: ≤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 800 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 800 Mechanical Properties

Reference sample and condition

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

Key properties	Value
Tensile strength	≥515 MPa
0.2% yield strength	≥205 MPa
Elongation	≥30%

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

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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