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Nickel Alloy Grade Data Sheet

Incoloy 800H

Incoloy 800H, designated UNS N08810, is a controlled-carbon nickel-iron-chromium alloy developed for prolonged service at elevated temperatures. Its higher carbon range and controlled coarse-grain structure provide significantly better creep and stress-rupture strength than conventional Alloy 800. The alloy also offers useful resistance to oxidation, carburization and nitriding atmospheres and is commonly supplied for reformer and pyrolysis furnace tubing, pigtails, manifolds, radiant tubes, retorts, furnace fixtures, steam superheater tubing and high-temperature heat exchangers.

 

 

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Material Overview

Incoloy 800H material profile

A concise grade introduction for buyers who need to confirm composition, properties, standards, available forms and suitable applications before sending an inquiry.

Engineering profile

Incoloy 800H, designated UNS N08810, is a controlled-carbon nickel-iron-chromium alloy developed for prolonged service at elevated temperatures. Its higher carbon range and controlled coarse-grain structure provide significantly better creep and stress-rupture strength than conventional Alloy 800. The alloy also offers useful resistance to oxidation, carburization and nitriding atmospheres and is commonly supplied for reformer and pyrolysis furnace tubing, pigtails, manifolds, radiant tubes, retorts, furnace fixtures, steam superheater tubing and high-temperature heat exchangers.

 

 

Incoloy 800H

Technical data on this page is for material selection reference. Final acceptance values should be confirmed by the purchase standard, heat treatment condition, product form, size and material test certificate.

Chemical Composition

Incoloy 800H composition range

The following table shows common limiting composition values for Alloy 625 / UNS N06625. Actual product chemistry is reported by heat on the material test certificate.

Element Symbol Composition, wt.% Role in Incoloy 800H
Nickel Ni 30.0-35.0 Maintains the austenitic structure and supports resistance to carburization and thermal degradation.
Chromium Cr 19.0-23.0 Provides resistance to oxidation and high-temperature corrosive atmospheres.
Iron Fe 39.5 min Forms the principal balance and helps resist internal oxidation in mixed-potential atmospheres.
Carbon C 0.05-0.10 The controlled carbon range contributes to creep and stress-rupture strength.
Aluminum Al 0.15-0.60 Supports oxidation resistance and elevated-temperature strength.
Titanium Ti 0.15-0.60 Contributes to metallurgical stability and high-temperature strength.
Aluminum + Titanium Al + Ti 0.30-1.20 Controlled within the UNS N08810 range; project-specific narrower limits may be requested.
Manganese Mn 1.50 max Controlled minor alloying and deoxidizing element.
Silicon Si 1.00 max Controlled for processing, weldability and high-temperature performance.
Copper Cu 0.75 max Controlled residual element.
Sulfur S 0.015 max Restricted to support hot workability and weld quality.

 

 

Physical Properties

Key physical and thermal data

These values help customers compare density, thermal behavior, magnetic response and conductivity during early material selection.

Property Metric Value Imperial Value Condition / Notes
Density 7.94 g/cm3 0.287 lb/in3 Room temperature
Melting Range 1357-1385 °C 2475-2525 °F Typical range
Specific Heat 460 J/kg·°C 0.11 Btu/lb·°F Mean value from 0 to 100 °C
Thermal Conductivity 11.5 W/m·°C Approx. 80 Btu·in/ft2·h·°F Approx. 20 °C
Electrical Resistivity 0.989 µΩ·m Approx. 595 ohm-cmil/ft Approx. 20 °C
Modulus of Elasticity 196.5 GPa 28.5 x 103 ksi Approx. 20 °C, dynamic method
Shear Modulus 73.4 GPa 10.64 x 103 ksi Approx. 20 °C
Mean Coefficient of Thermal Expansion 14.4 µm/m·°C Approx. 8.0 x 10-6 in/in·°F Mean value from approximately 20 to 100 °C
Magnetic Permeability Approx. 1.014 Essentially non-magnetic Annealed material at room temperature

 

 

Mechanical Properties

Room-temperature mechanical properties

Mechanical properties vary with product form, size, processing route and heat treatment. The table below summarizes commonly referenced nominal values for material selection.

Product Form / Condition Tensile Strength Yield Strength, 0.2% Elongation Technical Note
Rod and bar – solution annealed 450 MPa (65 ksi) min 170 MPa (25 ksi) min 30% min Representative ASTM B408 room-temperature minimum requirements; verify the applicable size provisions.
Plate, sheet and strip – solution annealed 450 MPa (65 ksi) min 170 MPa (25 ksi) min 30% min Representative ASTM B409 minimum requirements for controlled-grain UNS N08810 material.
Seamless pipe and tube – solution annealed 450 MPa (65 ksi) min 170 MPa (25 ksi) min 30% min Representative ASTM B407 requirements; test specimen and elongation provisions vary with dimensions.
Welded heat-exchanger tube – solution annealed 450 MPa (65 ksi) min 170 MPa (25 ksi) min 30% min Representative ASTM B515 requirements with specified grain-size and tube-testing provisions.
Representative annealed plate at 540 °C Approx. 432 MPa (62.7 ksi) Approx. 90 MPa (13.0 ksi) Approx. 13% Typical short-time elevated-temperature data, not a design allowable stress.
Representative annealed plate at 760 °C Approx. 236 MPa (34.2 ksi) Approx. 74 MPa (10.7 ksi) Approx. 13% Typical short-time data; long-duration design requires approved creep and rupture values.

Mechanical values are representative or specification-based and must not be treated as universal design allowables. Final acceptance depends on the product standard, dimensions, solution treatment, grain size, test orientation and material test certificate. High-temperature equipment must be designed using the applicable ASME or project-approved creep and stress-rupture data.

 

 

For pressure equipment, aerospace parts or project-specific acceptance, use the minimum requirements in the specified ASTM, ASME, AMS, EN or customer drawing rather than nominal values.

Standards & Specifications

Common Incoloy 800H standards by product form

YSN128 can quote Alloy 625 products according to ASTM, ASME, AMS, EN, DIN, ISO or customer drawing requirements. Certificate scope can be matched to the purchase order.

Product Form Common Standards Typical Supply Item Certificate / Inspection
Plate, Sheet and Strip ASTM B409 / ASME SB409, ASTM A240 / ASME SA240, EN 10028-7, EN 10095 Controlled-grain plate, sheet, strip and cut blanks EN 10204 3.1 MTC, chemistry, tensile test, grain size and heat-treatment record
Rod and Bar ASTM B408 / ASME SB408, ISO 9723, EN 10095 Round bar, rod, flat bar and machined blanks MTC, PMI, tensile test, grain size and dimensional inspection
Seamless Pipe & Tube ASTM B407 / ASME SB407, ASTM B163 / ASME SB163, ASTM B829 / ASME SB829 Seamless process pipe, furnace tube and heat-exchanger tube Hydrostatic or eddy-current testing, grain size, MTC and dimensional inspection
Welded Pipe ASTM B514 / ASME SB514 with ASTM B775 / ASME SB775 Longitudinally welded process and high-temperature pipe Weld examination, pressure or specified NDT, heat-treatment record and MTC
Welded Heat-Exchanger Tube ASTM B515 / ASME SB515 with ASTM B751 / ASME SB751 Boiler, condenser and heat-exchanger tubing Flattening, flange and specified nondestructive tests, grain size and MTC
Forgings, Flanges and Valve Parts ASTM B564 / ASME SB564, ISO 9725 Rings, discs, flanges, blocks and pressure-containing forgings Tensile test, grain size, heat-treatment record, PMI, UT when specified and MTC
Wrought Fittings ASTM B366 / ASME SB366 Elbows, tees, reducers, caps and custom wrought fittings PMI, dimensional inspection, heat-treatment record and MTC
Pressure Equipment Design Applicable ASME BPVC sections and current Code Cases Boiler, pressure-vessel and high-temperature piping components Verify the current Code edition, material listing, temperature limit and allowable stresses
Welding Products AWS A5.14 ERNiCr-3; higher-temperature filler selected by qualified WPS GTAW, GMAW and submerged-arc welding consumables Consumable certificate, lot traceability and procedure qualification

 

 

Available Product Forms

Incoloy 800H supply range

Review available product forms, size ranges, standards and delivery options for this alloy.

Form Common Size Range Delivery Condition Typical Applications Page Link
Pipe & Tube OD 6-610 mm, wall thickness or schedule to specification Seamless or welded, high-temperature solution annealed, pickled Reformer tubes, pigtails, convection tubing, manifolds and superheater systems View Pipe & Tube
Round Bar Diameter 3-300 mm, larger forged sizes and custom lengths available Hot rolled, forged, solution annealed, peeled or machined Furnace hardware, supports, valve parts and high-temperature fasteners View Round Bar
Sheet & Plate Thickness 0.5-100 mm, custom widths, lengths and cut parts Controlled-grain solution annealed, pickled or surface finished Furnace shells, heat shields, retorts, baffles and fabricated hot-section equipment View Sheet & Plate
Strip & Foil Thickness 0.02-3 mm, slit widths and coil weights to specification Cold rolled, annealed, bright or pickled High-temperature seals, expansion elements, shields and formed components View Strip & Foil
Wire Diameter 0.1-12 mm, coil, spool or straight-length supply Cold drawn, annealed, bright or cleaned Furnace mesh, woven components, retaining wire and fabricated hardware View Wire
Fasteners Standard and custom bolts, nuts, screws, studs and washers Solution annealed, machined, rolled thread or custom finished Petrochemical heaters, furnace assemblies and elevated-temperature equipment View Fasteners
Fittings ASME, EN and drawing-based elbows, tees, reducers and caps Wrought or fabricated, solution annealed and inspected Reformer piping, heater connections and high-temperature process lines View Fittings
Flanges ASME B16.5, ASME B16.47, EN or custom dimensions Forged, solution annealed, machined and inspected Manifolds, heater piping, pressure vessels and high-temperature connections View Flanges
Forgings Rings, discs, blocks, shafts and drawing-based components Forged, high-temperature solution annealed, rough or finish machined Tube sheets, manifolds, valve bodies, rings and pressure-containing parts View Forgings
Welding Wire Diameter 0.8-4.0 mm, spool, coil or straight-length supply Clean bright finish, precision drawn and controlled chemistry Joining Alloy 800H, repair welding and high-temperature fabrication View Welding Wire

 

 

Material Selection Guide

When to consider Incoloy 800H

This guide helps buyers connect service conditions with the typical advantage of Alloy 625. Final selection should consider medium concentration, temperature, pressure, fabrication, availability and budget.

Service Requirement Why Incoloy 800H Helps Common Product Form Buyer Note
Long-term service above 593 °C Controlled carbon and coarse grains provide greater creep and stress-rupture strength than conventional Alloy 800. Pipe, tube, plate, bar, forgings and fittings Provide the design temperature, pressure, required life and applicable construction code.
Steam and hydrocarbon reforming The alloy combines elevated-temperature strength with resistance to oxidation and carburizing atmospheres. Catalyst tube, pigtail, manifold, flange and fitting Confirm process-gas chemistry, metal temperature, pressure and thermal cycling.
Ethylene and pyrolysis furnaces Maintains useful metallurgical stability during extended exposure to high-temperature process conditions. Convection tube, cracking tube, pigtail and return bend Review carburization, coke formation, decoking cycles and weld-joint requirements.
Industrial heat-treatment furnaces Provides useful resistance to oxidation, carburization and selected nitriding atmospheres. Radiant tube, muffle, retort, fixture, plate and bar Specify the furnace atmosphere, maximum temperature, load and cycle frequency.
High-temperature pressure equipment UNS N08810 has recognized product specifications and elevated-temperature design data where permitted by the governing code. Tube, pipe, forging, flange and plate Verify the current ASME material listing, allowable stress and construction rules.
Welded elevated-temperature assemblies The alloy can be welded using filler metals selected for the required service temperature and rupture strength. Plate, pipe, tube, fitting and fabricated assembly Qualify the WPS and evaluate whether fabrication strain requires stress relief or solution annealing.

 

 

Why Choose Us

Supply and quality support for Incoloy 800H

For ranking traffic, buyers need more than a data sheet. This section gives clear trust signals for procurement, engineering and quality teams.

STASTM / ASME / AMS / EN

Quotation can be matched to project standards and product form specifications.

MTEN10204 3.1 MTC

Heat number, chemistry, mechanical properties and inspection records can be supplied.

QCPMI & Inspection

PMI, UT, dimensional inspection, visual inspection and packing check are available.

CSCustom Size

Cutting, machining allowance, rough machining and drawing-based supply can be arranged.

EPExport Packing

Wooden case, bundle, waterproof protection and international shipping documents.

RFFast Technical Reply

Send grade, size, standard, quantity and destination for a practical quotation route.

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FAQ

Incoloy 800H questions from buyers

Find practical answers about procurement, standards, fabrication and industrial applications.

Incoloy 800H is mainly used for equipment requiring creep and stress-rupture strength during prolonged high-temperature exposure. Applications include reformer tubing, pigtails, manifolds, ethylene furnace components, radiant tubes, retorts, furnace fixtures, steam superheater tubing and high-temperature heat exchangers.

Yes. UNS N08810 is the standardized designation for Incoloy 800H. The material may also be identified as Alloy 800H, Werkstoff 1.4958 or EN X5NiCrAlTi31-20.

Incoloy 800H has a controlled carbon range of 0.05-0.10% and is solution annealed to develop an average ASTM grain size of 5 or coarser. These requirements give it substantially better long-term creep and rupture strength than standard Alloy 800, particularly in service above approximately 593 °C.

UNS N08811 Alloy 800HT has narrower requirements than 800H, including carbon of 0.06-0.10% and combined aluminum plus titanium of 0.85-1.20%. Alloy 800H permits carbon of 0.05-0.10% and aluminum plus titanium of 0.30-1.20%. Therefore, ordinary N08810 material cannot be certified as N08811 unless all additional 800HT requirements are met.

We can quote plate, sheet, strip, foil, round bar, rod, wire, seamless or welded pipe and tube, fasteners, fittings, flanges, forgings and welding wire. Custom dimensions, cut pieces, machining allowance and drawing-based products can also be discussed.

Common standards include ASTM B409 for plate, sheet and strip, ASTM B408 for rod and bar, ASTM B407 or B163 for seamless pipe and tube, ASTM B514 for welded pipe, ASTM B515 for welded heat-exchanger tube, ASTM B564 for forgings and ASTM B366 for wrought fittings. State the required edition and corresponding ASME specification in the purchase order.

Yes. Alloy 800H has good weldability when a qualified procedure and suitable nickel-alloy filler are used. ERNiCr-3 is commonly selected for service up to approximately 790 °C, while higher-temperature applications may require a filler with greater creep-rupture strength. Filler selection must consider temperature, atmosphere, required life and the governing construction code.

Please provide UNS N08810, product form, dimensions, quantity, applicable ASTM or ASME standard, heat-treatment and grain-size requirements, certificate type and destination. For high-temperature projects, also send the design temperature, pressure, required service life, atmosphere, drawings, welding requirements and inspection plan.

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