Introduction

Incoloy 800 Alloy (UNS N08800) is a nickel-iron-chromium alloy containing 30–35% nickel, 19–23% chromium, with the balance iron. This heat resistant nickel alloy offers good strength and excellent resistance to oxidation and carburization in high-temperature atmospheres. It provides general corrosion resistance to many aqueous media and resists stress corrosion cracking. This high temperature alloy 800 is the preferred material for heat exchangers, petrochemical processing, furnace equipment, industrial furnaces, power generation, pressure vessels, hydrogen production, and steam superheaters. Available in Incoloy 800 plate, sheet, strip, seamless pipe, tube, bar, round bar, rod, wire, forgings, flanges, fittings, and fasteners, in hot rolled, cold rolled, cold drawn, annealed, and solution annealed conditions.

Chemical components（%）

Mechanical properties

Physical properties

Incoloy 800 Available Products and Standard

1. GB/T 15007 (Nickel and Nickel Alloy Plate, Strip, and Foil)

Domestic Grade: NS1101 (GB/T 15007) / Incoloy 800 equivalent

Type: Sheet / Plate / Strip / Wire / Tube / Bar

Size Range:

• Incoloy 800 Wire: 0.1 – 15.0 mm dia

• Incoloy 800 Strip: 0.05 – 5.0 mm thick × 5 – 500 mm wide

• Incoloy 800 Round Bar: 8 – 355 mm dia

• Incoloy 800 Sheet / Plate: 0.5 – 180 mm thick

• Incoloy 800 Seamless Tube / Pipe: Custom sizes available

Surface: Annealed, Bright, Pickled, Ground

Testing: Chemical analysis, mechanical test (tensile strength, yield strength, elongation), hardness test, intergranular corrosion test, high-temperature oxidation test, dimensional inspection

2. ASTM B407 (Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube)

Grade: UNS N08800 / N08810 / N08811 / Incoloy 800 / 800H / 800HT

Type: Seamless Pipe / Seamless Tube / Heat Exchanger Tube

Size Range:

• Incoloy 800 Seamless Pipe: 6 – 610 mm OD × 1 – 50 mm wall thickness

• Incoloy 800 Seamless Tube: Custom sizes

Surface: Annealed, Pickled, Bright

Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hydrostatic test, eddy current test, dimensional inspection

3. ASTM B408 (Standard Specification for Nickel-Iron-Chromium Alloy Rod and Bar)

Grade: UNS N08800 / N08810 / N08811 / Incoloy 800 / 800H / 800HT

Type: Round Bar / Rod / Wire

Size Range:

• Incoloy 800 Round Bar: 8 – 355 mm dia (hot rolled or cold drawn)

• Incoloy 800 Wire: 0.1 – 15.0 mm dia (coils or straight)

Surface: Annealed, Pickled, Ground, Turned, Bright

Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hardness test, ultrasonic test, dimensional inspection

4. ASTM B409 (Standard Specification for Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip)

Grade: UNS N08800 / N08810 / N08811 / Incoloy 800 / 800H / 800HT

Type: Sheet / Plate / Strip

Size Range:

• Incoloy 800 Sheet / Plate: 0.5 – 180 mm thick (hot rolled or cold rolled)

• Incoloy 800 Strip: 0.05 – 5.0 mm thick × up to 500 mm wide (coils)

Surface: Annealed, Pickled, Bright, Polished

Testing: Chemical analysis, mechanical test (tensile, yield, elongation), hardness test, intergranular corrosion test, high-temperature oxidation test, dimensional inspection

Applications

1. Heat Exchangers & Petrochemical Industry

• For shell‑and‑tube heat exchangers, superheater tubing, and reboiler bundles in high‑temperature process service, Incoloy 800 for heat exchanger provides excellent oxidation resistance and thermal stability at elevated temperatures.

• For petrochemical industry furnace cracker tubes, pigtails, headers, and transfer lines, Incoloy 800 pipe withstands carburization resistance and high‑temperature corrosion in aggressive hydrocarbon environments.

• For chemical processing equipment and nitric acid solution transmission pipes, Alloy 800 tube resists chloride stress corrosion cracking.

2. Furnace Equipment & Industrial Furnaces

• For furnace equipment including furnace linings, radiant tubes, and heat‑treating components, Incoloy 800 for industrial furnace provides thermal fatigue resistance and stability in high‑temperature atmospheres.

• For heat-treating equipment such as baskets, trays, and fixtures, Incoloy 800 sheet and plate are fabricated into complex shapes with excellent formability and weldability.

3. Power Generation & Steam Superheaters

• For power generation superheater and reheater tubing, Incoloy 800 offers resistance to oxidation and maintains mechanical properties at elevated temperatures.

• For steam superheater applications and steam generation plants, UNS N08800 tube resists stress cracking in high‑temperature water environments.

4. Hydrogen Production & Pressure Vessels

• For hydrogen production steam/hydrocarbon reforming, Incoloy 800 pipe is specified for catalyst tubes, quench system piping, and transfer lines where resistance to high‑temperature hydrogen attack is critical.

• For ASME‑coded pressure vessels in high‑temperature corrosive service, ASTM B409 Incoloy 800 plate combines fabricability with elevated‑temperature strength and oxidation resistance.

5. Heating Element Sheathing & Thermal Processing

• For heating element sheathing and electrical heating element protection tubes, Incoloy 800 provides durability and performance stability under aggressive thermal cycles.

• For industrial heating equipment and thermal processing applications, heat resistant alloy 800 ensures dependable long‑term performance in high‑temperature service.

FAQ – Incoloy 800 Alloy

Q: What is the difference between Incoloy 800, 800H, and 800HT?

A: Incoloy 800 (UNS N08800) is the base grade with general high‑temperature properties. Incoloy 800H (UNS N08810) has controlled carbon (0.05–0.10%) and is solution annealed at 2100°F to achieve ASTM grain size 5 or coarser for superior creep resistance above 1100°F. Incoloy 800HT (UNS N08811) adds aluminum and titanium for maximum creep‑rupture strength.

Q: What is the maximum operating temperature for Incoloy 800?

A: Incoloy 800 is suitable for continuous service up to 815°C (1500°F). It offers good high‑temperature strength and creep resistance in the range of 600–1100°C. For applications requiring higher creep‑rupture strength above 1100°F, Incoloy 800H or 800HT is recommended.

Q: What are the key ASTM standards for Incoloy 800?

A: ASTM B409 for plate, sheet, and strip; ASTM B407 for seamless pipe and tube; ASTM B408 for bar, rod, and wire. ASME equivalents: SB409, SB407, SB408 for pressure vessel applications.

Q: What industries commonly use Incoloy 800?

A: Petrochemical (furnace cracker tubes, pigtails, headers, transfer lines, quench systems), heat exchangers and power generation (superheater tubing, steam generation), chemical processing (nitric acid transmission, chloride stress corrosion resistance), furnace equipment and heat-treating (baskets, trays, fixtures, furnace linings), hydrogen production (steam/hydrocarbon reforming), and heating element sheathing.

We are a trusted Incoloy 800 Supplier and Incoloy 800 Manufacturer, China‑based, serving petrochemical plants, heat exchanger fabricators, furnace equipment builders, and power generation contractors worldwide. All products comply with ASTM B409 / B407 / B408 / ASME SB409 with EN 10204 3.1 mill certificates, PMI verification, and dimensional inspection reports. We offer Incoloy 800 plate, sheet, seamless pipe, tube, bar, round bar, rod, wire, forgings, flanges, fittings, and fasteners in custom sizes, with cut‑to‑size, precision machining, and solution annealing services. Contact us at info@monokj.com for size chart, pricing, or custom requirements.