Introductions

Incoloy 800H (UNS N08810 / Alloy 800H) is a high carbon variant of Incoloy 800, offering significantly higher creep rupture strength at temperatures above 700°C. Incoloy 800H seamless tube, pipe, heat exchanger tube, round bar, forging, and plate are widely used in petrochemical furnaces, steam superheaters, reformer tubes, cracking tubes, radiant tubes, and nuclear steam generators. This austenitic nickel‑iron‑chromium alloy provides excellent oxidation and carburization resistance up to 1100°C. Compared to standard Incoloy 800, Alloy 800H delivers superior creep resistance for long‑term high‑temperature service. Available per ASTM B407, B408, B409, or ASTM B163 for heat exchanger tubing.

Chemical compotents（%）

Mechanical properties

Physical properties

Incoloy 800H (UNS N08810 / NS112) – Available Products and Standard

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

Domestic Grade: NS112 (GB/T 15007) / Incoloy 800H equivalent

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

Size Range:

Wire: 0.1 – 15.0 mm dia

Strip: 0.05 – 5.0 mm thick × 5 – 500 mm wide

Round Bar: 8 – 355 mm dia

Sheet / Plate: 0.5 – 180 mm thick

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 creep test, dimensional inspection

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

Grade: UNS N08810 / Incoloy 800H / Alloy 800H / W.Nr. 1.4958

Type: Seamless Pipe / Seamless Tube / Heat Exchanger Tube

Size Range:

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

Seamless Tube: Custom sizes

Surface: Annealed, Pickled, Bright

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

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

Grade: UNS N08810 / Incoloy 800H / Alloy 800H

Type: Round Bar / Rod / Wire

Size Range:

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

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 N08810 / Incoloy 800H / Alloy 800H

Type: Sheet / Plate / Strip

Size Range:

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

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 creep test, dimensional inspection

Advantages

(1)High creep rupture strength above 700°C – Incoloy 800H seamless tube and pipe offer significantly higher creep resistance than standard Incoloy 800, making them ideal for long‑term high‑temperature service in petrochemical furnaces.

(2)Excellent oxidation and carburization resistance up to 1100°C – Alloy 800H plate and sheet maintain surface stability in aggressive gaseous environments, including reformer tubes and radiant tubes.

(3)High carbon variant for improved thermal stability – Incoloy 800H round bar and forging retain austenitic structure and resist embrittlement after prolonged exposure at 700–900°C.

(4)Good weldability and formability – Incoloy 800H welding wire and filler rod enable reliable fabrication of heat exchanger tubes, steam superheater components, and transfer lines.

(5)Versatile product forms – Incoloy 800H heat exchanger tube, flange, fitting, and fastener are available for power generation, chemical processing, and nuclear steam generator applications.

Applications

(1)Petrochemical reformer and cracking tubes – Incoloy 800H seamless pipe and tube are standard materials for ethylene cracking, hydrogen reformer plants, and pigtail transfer lines operating above 700°C.

(2)Steam superheaters and heat exchangers – Incoloy 800H heat exchanger tube and seamless tube (ASTM B163) provide reliable service in superheater coils and high‑temperature heat exchangers.

(3)Furnace components – Incoloy 800H radiant tube, retort, and plate resist carburization and thermal fatigue in heat treating furnaces and annealing equipment.

(4)Nuclear steam generators – Incoloy 800H forging and tube are used in pressurized water reactor steam generators where high creep strength and corrosion resistance are critical.

(5)Power generation – Incoloy 800H round bar and flange serve in gas turbine exhaust systems, boiler supports, and high‑temperature piping.

(6)Chemical processing – Incoloy 800H welding wire and strip are applied in nitric acid plants, caustic evaporators, and furnace baffles requiring oxidation resistance up to 1100°C.

MONO Group is one of Superalloy, Nickel alloy, high Temperature alloy manufacturer&Supplier&Wholesaler from China,We can supply high quality alloy plate,sheet,round bar,tube.pipes,fittings,flange,and custom parts in accordance with ASTM, ASME, DIN, ISO, GB, and other international standards. For inquiries or to request a quote , please freely contact us at info@monokj.com.