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.

Alloy 625 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 Inconel®


N/A Pipe


N/A Sch. 40


N/A 4 inches101.6 mm

Nominal Diameter (Standard)

N/A 3 1/2 inches

Nominal Diameter (Metric)

N/A 90 mm

Nickel Alloy Compositions


N/A Alloy 625


N/A 8.44 g/cm³0.305 lbs/in³

ASTM Specification

N/A ASME Code Case 1935 ASME SB 444/SB 829 ASME SB 704/SB 751 ASME SB 705/SB 775 ASTM B 444/B 829 ASTM B 704/B 751 ASTM B 705/B 775 BS 3074NA21 DIN 17751 ISO 6207 SAE/AMS 5581 VdTÜV 499

Additional Information

Additional Information

N/A 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.

Various oceanographic equipment incorporates Nickel Alloy 625 parts and components. For environmental control systems, an assortment of rings and tubing utilize Nickel Alloy 625 in their assemblies.

Due to the demand of Nickel Alloy 625 by many industries, we stock and sell various forms including plate, tube, sheet, strip, round bar, flat bar, forging stock, hexagon, wire, and extruded sections.

We work with our partner mills to ensure all alloys meet or exceed critical industry standards including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS. Our Nickel Alloy 625 and Inconel® 625 pipes will also meet ASME code for Boiler and Pressure Vessels. With a reputation for real-time inventory, reliable delivery, and competitive pricing, all of our Nickel Alloy 625 pipes are sized and shaped according to your specifications. We work with our clients to provide the best alloy for their needs, from titanium and nickel to steel, aluminum, and copper.