Introduction

ASTM B407 Seamless Nickel Alloy Pipe is the standard specification for nickel-iron-chromium alloy seamless pipe and tube, covering the Incoloy 800 series: Incoloy 800 (UNS N08800) , Incoloy 800H (UNS N08810) , and Incoloy 800HT (UNS N08811) . These alloys are the workhorse materials for high‑temperature industrial heating, petrochemical reforming, and power generation where temperatures reach 1100–2100°F (593–1150°C). Available in cold‑worked annealed and hot‑finished conditions, custom size, Schedule 40/80, and large diameter options. This high temperature nickel alloy is the preferred material for heat exchangers, furnace components, petrochemical processing, and thermal processing equipment.

Specifications & Process Options

Applications

1. Heat Exchangers & Thermal Processing Equipment

• In shell‑and‑tube heat exchangers, reboilers, and condenser systems operating at elevated temperatures, ASTM B407 seamless pipe for heat exchangers delivers high temperature oxidation resistance and thermal stability up to 1100°C (2010°F). The Incoloy 800 pipe maintains mechanical integrity under prolonged thermal cycling in petrochemical refineries, power plants, and chemical processing facilities.

• ASTM B407 nickel alloy tube is widely specified for superheater tubes in fossil fuel plants and transfer line exchangers in ethylene production. Its resistance to oxidation and carburization ensures prolonged service life in high‑temperature corrosive environments. This high temperature nickel alloy retains mechanical properties up to 1500°F (816°C).

2. Furnace Components & Heat Treating Equipment

• For radiant tubes, retorts, muffles, and furnace roller rails in industrial heat‑treating furnaces, Incoloy 800H seamless pipe for heat resisting applications provides controlled grain size for optimum creep and rupture resistance above 1100°F (593°C). The nickel-iron-chromium alloy composition offers excellent resistance to carburization and thermal fatigue under cyclic heating and cooling.

• Incoloy 800HT pipe for thermal processing is the preferred material for ethylene cracker furnaces, hydrogen reformers, and ammonia reformer primary and secondary tubes. The heat resistant alloy pipe withstands extreme temperatures and aggressive furnace atmospheres in petrochemical cracking and reforming applications.

3. Petrochemical Processing & Power Generation

• In petrochemical plants processing hydrocarbon streams at elevated temperatures, ASTM B407 Incoloy 800 pipe is used for reactor tubes, process piping, and transfer lines in reforming and cracking units. Its resistance to sulfur attack and oxidation ensures reliable performance in high‑temperature corrosive environments.

• Alloy 800 pipe for nuclear power plants is specified for nuclear steam generator tubing and reactor coolant systems, where metallurgical stability and resistance to high‑temperature water corrosion are critical. The high temperature nickel alloy seamless pipe is also used in boiler tubing and heat exchanger sections in fossil and nuclear power generation.

4. Chemical Processing & Oxidation Resistant Service

• For chemical processing equipment handling nitric acid solutions and corrosive media, ASTM B407 nickel-iron-chromium alloy pipe resists chloride stress corrosion cracking and general corrosion. Its nickel-iron-chromium alloy composition provides balanced oxidation resistance up to 1100°F (593°C).

• The heat resisting nickel alloy seamless tube is used in industrial furnace components, carburizing equipment, heating‑element sheathing, and thermal processing systems where oxidation and carburization resistance are critical.

FAQ – ASTM B407 Incoloy 800 Pipe

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

A: Incoloy 800 seamless pipe is the basic grade for high‑temperature service up to 1100°F (593°C). Incoloy 800H seamless pipe has higher carbon content (0.05–0.10%) for improved creep strength above 1100°F. Incoloy 800HT seamless pipe features controlled carbon (0.06–0.10%) and Al+Ti addition (≥0.85%) for superior creep rupture strength, making it the preferred choice for demanding petrochemical and furnace applications.

Q: What is the maximum operating temperature for Incoloy 800/800H/800HT pipes?

A: Incoloy 800 pipe is suitable for service up to 1100°F (593°C). Incoloy 800H pipe and Incoloy 800HT pipe are designed for temperatures above 1100°F (593°C) where resistance to creep and rupture is required. All three grades can operate up to approximately 1500°F (816°C) depending on load and environment.

Q: Can ASTM B407 pipe be welded without post‑weld heat treatment?

A: Yes. ASTM B407 seamless pipe can be welded using TIG, GTAW, MIG, or SMAW processes with matching nickel‑based filler material (AWS A5.14 ERNiCr‑3 or ERNiCrFe‑6). For solution‑finished Incoloy 800H pipe, post‑weld heat treatment is generally not mandatory, as welded joints undergo an aging process during high‑temperature service. Heat input and interpass temperature should be controlled to below 150°C to avoid grain coarsening.

Q: What is the difference between ASTM B407 and ASME SB407?

A: ASTM B407 is the material specification published by ASTM, covering chemical composition, mechanical properties, and testing for nickel‑iron‑chromium alloy seamless pipe. ASME SB407 is the ASME adoption of the same specification for pressure vessel and boiler applications, listed in the ASME Boiler and Pressure Vessel Code, Section II, Part B. Materials meeting both standards can carry the SB‑407 designation for code‑stamped pressure equipment in power plants, refineries, and chemical process vessels.

We are a trusted ASTM B407 Seamless Nickel Alloy Pipe Supplier and Incoloy 800 Pipe Manufacturer, China‑based, serving furnace builders, chemical processors, petrochemical contractors, and power generation equipment manufacturers worldwide. All products comply with ASTM B407 / ASME SB407 with EN 10204 3.1 mill certificates, PMI verification, hydrostatic and eddy current test reports. We offer cold‑worked annealed and hot‑finished Incoloy pipe in custom sizes, Schedule 40/80, and large diameter options. Contact us at info@monokj.com for size chart, pricing, or custom requirements.