Inconel 625 is a popular nickel-based superalloy. It is renowned for having commendable strength and great resistance to elevated temperatures. This nickel alloy also demonstrates exceptional protection against oxidation and corrosion, while also having the capacity to withstand a wide range of temperatures and high stress. It is able to withstand an expansive range of temperature and high stress both in and out water, and also has the capacity to effectively resist corrosion while being exposed to environments that are highly acidic. This feature of Nickel Alloy 625 makes it a good choice for marine and nuclear applications.

Inconel Alloy 625 was developed sometime during the 1960s, with the aim of creating a material that can be used for the purpose of steam-line piping. A few modifications were made to the original composition of this superalloy in order to make it more weldable and creep resistant. Over the years this material has become quite a favorite of forged fittings manufacturers and tends to be widely used to make valves and pumps for the chemical processing industry, as well as nuclear and marine applications. A number of high-pressure equipment is also made with the help of this nickel-based superalloy.

The high strength of Inconel 625 is majorly due to a solid solution effect from columbium and molybdenum. This nickel-based superalloy is also known for its remarkable weldability, and the matching filler metals are quite often used for the purpose of welding the aqueous corrosion alloy AL-6XN® and dissimilar metal joining.

The prime characteristics of the Inconel Alloy 625 

  • Incredible corrosion resistance to diverse types of media in both reduction and oxidation environments
  • High resistance to crevice and pitting corrosion
  • Resistant to caustics
  • High resistance to inorganic acid corrosion, which includes hydrochloric acid, nitric acid, sulphuric acid, phosphoric acid, as well as a mixture of hydrochloric acid and sulphuric acid
  • Non-magnetic
  • Commendable resistance to a range of concentrations of hydrochloric acid when the up to 40 
  • No weld cracking sensitivity and good machining 
  • Great welding properties 
  • Immune to chloride ion stress corrosion cracking
  • Resistant to seawater, in both stagnant and flowing environments
  • High creep-rupture strength
  • Oxidation resistant up to 1800° F

Alloy 625 Pipe Specification

Alloy 625 Pipe SpecificationASTM B 167 ASME SB 167 / ASTM B 829 ASME SB 829 / ASTM B 517 ASME SB 517
Alloy 625 Seamless Pipe size4 to 219mm W. T.: 0.5 to 20mm
Inconel 625 Welded Pipe size5.0 mm – 1219.2 mm
Alloy 625 EFW Pipe size5.0 mm – 1219.2 mm
Inconel 625 Pipe ScheduleSCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Inconel 625 Pipe FormRound, Square, Hollow, Rectangular, Hydraulic, Straight Pipes Etc.
Alloy 625 Pipe EndPlain End, Beveled End, Treaded.
Inconel 625 Pipe LengthSingle Random, Double Random & Cut Length.
OriginEuropean, Japanese, Korean, US, Russian, Indian (Strictly No Chinese Material)
MarkingAll Inconel Alloy 625 Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or according to the customer’s request.)
Manufacturers of Inconel 625 Pipe
  • Alloy 625 Pipe make Sumitomo Metals, Japan
  • Alloy 625 Pipe make Tubacex Tubos Inoxidables S.A., Spain
  • Inconel 625 Seamless Pipe make Seah Steel Corporation, Korea
  • Inconel 625 Pipe make Sanyo Special Steel, Japan
  • Inconel 625 Pipe make Nippon Steel Corporation, Japan
  • Inconel Alloy 625 Pipe make Kobe Special Tube, Japan
  • Inconel Alloy 625 Pipe make Schoeller Bleckmann, Austria
Inconel Alloy 625 Pipe FinishPolished, AP (Annealed & Pickled), BA (Bright & Annealed), MF
Our PresenceUSA, Canada, Australia, UK, Malaysia, Poland, Iran, Italy, Singapore, UAE
Material Test Certificates (MTC)Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
  • Hardness Test
  • Flattening Test
  • Pitting Resistance Test
  • Chemical Analysis – Spectro Analysis
  • Micro and MacroTest
  • Flaring Test
  • Intergranular Corrosion (IGC) Test
  • Mechanical Testing Such as Tensile of Area
  • Positive Material Identification – PMI Testing
Specialized inLarge Diameter Alloy 625 Pipe
We can also cut, thread, and groove Inconel 625 Pipes to meet your specifications. Pipe Dimension ANSI/ ASME B36.10, B36.19, B2.1

Inconel Alloy 625 Pipe & Seamless Pipe Stock List

AlloyProduct formDimension
ALLOY 625 (61 Ni/22 Cr/9 Mo)Pipe; seamless, annealed4.50 x 0.75 mm
ALLOY 625 (61 Ni/22 Cr/9 Mo)Pipe; seamless, pickled, annealed33.40 x 3.38 mm (1″nb sch40s)
INCONEL 625 (61 Ni/22 Cr/9 Mo)Pipe; welded, bright solution annealed60.33 x 2.77 mm (2″nb sch10s)
INCONEL 625 (61 Ni/22 Cr/9 Mo)Pipe; seamless, cold drawn, ground, annealed60.33 x 3.91 mm (2″nb Sch40s)

Inconel 625 Pipe TypesOut diameterWall thicknessLength
NB Sizes (in stock)1/8” ~ 8”SCH 5 / SCH 10 / SCH 40 / SCH 80 / SCH 160Upto 6 Meters
Inconel 625 Seamless Pipe (Custom Sizes)5.0mm ~ 203.2mmAs per requirementUpto 6 Meters
Inconel 625 Welded Pipe (in Stock + Custom Sizes)5.0mm ~ 1219.2mm1.0 ~ 15.0 mmUpto 6 Meters

Hot and cold forming of Inconel 625 

Owing to the fact that Inconel Alloy 625 was initially developed with the aim of retaining high strength at quite elevated temperatures, this nickel-based superalloy is able to resist deformation quite commendably in diverse hot-working temperatures. However, if adequately powerful equipment is used, this material tends to be readily fabricated by hot forming.

It is important to make sure that Inconel 625 is heated in a furnace whose temperature is held at 2150°F but not above it, when it comes to hot forming. While following the relevant permitted conditions, the work must be brought up to as close to 2150°F as possible. It is possible for heavy forging to be carried out from 2150°F down to 1850°F, while lighter reductions may be taken down to the temperature of 1700°F. For the purpose of guarding against the duplex grain structure, it is important to make sure that the work is given uniform reductions. It is highly recommended to go for final minimum reductions of 15 to 20% for open-die work for this nickel-based superalloy.

The standard cold-formed processes can easily be used for Inconel 625. Augmented tensile properties can ideally be achieved with the help of cold work for distinct moderate-temperature applications. Ductility can ideally be restored by process anneal in the scenario that the metal becomes too stiff from the process of cold work.

Welding of Inconel 625 

The Alloy 625 can be joined quite readily with the help of various conventional welding procedures and processes. The INCONEL Welding Electrode 112 and INCONEL Filler Metal 625 are among the most popular nickel-chromium-molybdenum products that have been designed to weld this nickel-based superalloy to itself and to various types of other materials. Much like the Alloy 625 itself, the deposited weld materials from both products are known to be quite resistant to oxidation and corrosion, while also having high toughness and strength from the cryogenic range to 1800°F. These materials do not need any kind of post-weld heating treatments in order to maintain their ductility and strength. In case used to weld Alloy 625 to dissimilar metals, both the products manage to maintain characteristic properties even while tolerating a high degree of dilution.

It is vital to make sure that the standard practices like U-joints for thicker sections, good joint alignment, and clean surfaces are adequately followed when carrying out a welding process.

Pickling of Inconel 625

Inconel Alloy 625 tends to forms a tightly adherent oxide or scale unless it has have been adequately bright-annealed in a vacuum or very dry hydrogen, unlike most other nickel-chromium-iron and nickel-chromium alloys. It is recommended to go for a treatment in a fused-salt bath prior to pickling in order to remove the oxide that results from heating.

The corrosion resistance of Inconel 625

Inconel Alloy 625 has a high alloy content which helps it to efficiently withstand a wide range of severe corrosive environments. There almost is no type of attack in mild environments like neutral salts, alkaline media, atmosphere, as well as fresh and seawater. While the high level of molybdenum and nickel present in this allow provide it with resistance to non-oxidizing environments, the combination of chromium and nickel present in the composition of Alloy 625 aids in providing resistance to oxidizing chemicals in severe corrosive environments. The high levels of molybdenum present in this material also make it highly resistant to crevice corrosion and pitting. While on the other hand, the niobium is known to act efficiently in stabilizing the alloy against sensitization during the process of welding, so as to prevent subsequent intergranular cracking. The nickel content in this superalloy also provides it with freedom from the issue of stress corrosion cracking.

The common applications of Inconel 625

  • Flue gas desulfurization scrubbers
  • Weld overlay
  • Aerospace
  • Jet engine exhaust systems
  • Engine thrust-reverser systems
  • Chemical process equipment
  • Aircraft ducting systems
  • Specialized seawater equipment

Nickel Alloy 625 is also typically used for evaporators meant for wet-process phosphoric acid-containing ferric salts, H2SO4, and HF.

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