Within our 800 alloy family, we sell a unique nickel-iron-chromium alloy known as Incoloy® 800HT and Nickel Alloy 800HT pipe that is designed to provide optimal performance at higher temperatures. While similar in characteristics to many other 800 alloy pipes, 800HT offers the same chemical composition as Incoloy® 800H but with differing levels of carbon, aluminum, and titanium.

Alloy 800H/HT Pipe is available in Seamless or Welded from Size ranges 1/8" up to 26". Listed below are common sizes. Please contact for sizes not listed.
Unit of Measure



N/A Incoloy®


N/A Pipe


N/A Sch. 10


N/A 2.375 inches60.325 mm

Nominal Diameter (Standard)

N/A 2 inches

Nominal Diameter (Metric)

N/A 50 mm

Nickel Alloy Compositions


N/A Alloy 800H/HT


N/A 7.94 g/cm³0.287 lbs/in³

ASTM Specification

N/A ASME Code Case 1325 and 1983 ASME SB 163 ASME SB 407/SB 829 ASME SB 514/SB 775 ASME SB 515/SB 751 ASTM B 163 ASTM B 407/B 829 ASTM B 514/B 775 ASTM B 515/B 751 BS 3074NA15 DIN 17459 ISO 6207 SEW 470 VdTÜV 412 and 434

Additional Information

Additional Information

N/A Combining high strength properties with ease of fabrication, Nickel Alloy 625 and Inconel® 625 is a popular nickel-chromium alloy pipe used in nuclear power production, marine engineering, and aerospace. With the addition of molybdenum and niobium, Nickel Alloy 625 pipe features enhanced strength characteristics. It offers outstanding thermal fatigue strength over a wide range of temperatures ranging from cryogenic to 1800 ºF (982 ºC). Nickel Alloy 625 is also resistant to oxidation as well as other corrosive elements. Nickel Alloy 625 is made with a minimum of 58% Nickel along with 20-23% Cr, 8-10% Mo, and 3.15-4.15% Nb. It also contains a maximum of 5% Fe, 1% Co, 0.50% Si, 0.15% P, and 0.15% S.

Nickel Alloy 625 and Inconel® 625 is easy to fabricate and join using any type of welding process, making it extremely popular for multiple applications. In nuclear engineering, reactor cores and control rod components are made using Nickel Alloy 625. For military applications, Nickel Alloy 625 wire rope is used for cables and blades on naval gunboats and submarines.

Featured for its superior oxidation, sulfidation, and carburization resistance, Incoloy® 800HT piping is composed of 39.5% minimum Fe, 30-35% Nickel, 19-23% Cr, 0.85-1.20% Al+Ti, and 0.06-0.10% C. Incoloy® 800HT and Nickel Alloy 800HT are extremely resistant to prolonged exposure to high-temperature corrosion or aqueous corrosion at moderate temperatures. These pipes feature higher creep and rupture properties in environments above 1100 ºF (600 ºC), providing superior structural integrity for industries that require high-temperature operations.

It is readily machined using standard methods or pipe fabrication techniques and, as a result, widely deployed in high-temperature settings where manufacturability is equally important. Used in a variety of industries, Incoloy® 800HT, and Nickel 800HT are used in hydrocarbon cracking, heat-treating equipment, pressure vessels and heat exchangers, industrial furnace and boiler equipment, chemical, and petrochemical processing.

Incoloy® 800HT is capable of meeting more than 40 critical industrial standards from organizations such as ASTM, ASME, BS, SEW, DI, EN, and ISO. As a result, we provide both Incoloy® 800HT and Nickel Alloy 800HT in a variety of alternative forms including tube, sheet, strip, plate round bar, flat bar, forging stock, hexagon, and wire. All of our piping is stocked and sold direct as well as available customized to your specifications. Serving a variety of applications throughout the globe, Incoloy® 800HT pipe is widely adopted for performance-oriented applications involving critical temperature exposure cycles.