Inconel Pipes & Tubes
Giriraj Impex stocks, supplies and exports Inconel pipes and tubes in alloys 600, 601, 625 and 718. We supply seamless Inconel pipes and tubes to ASTM B167 (alloys 600 and 601) and ASTM B444 (alloy 625), and welded pipe and tube to ASTM B517 and B516 (alloy 600) and ASTM B705 and B704 (alloy 625), sourced from approved mills in nominal bore and OD sizes, with mill test certificates.
Inconel pipes and tubes are used where stainless steel cannot cope with the combination of temperature and corrosion – furnace and heat-treatment equipment, high-temperature chemical service, seawater and sour-gas lines, flare systems, and heat exchangers in aggressive media.
Specifications
| Alloy | Seamless pipe and tube | Welded pipe / welded tube |
|---|---|---|
| Inconel 600 (N06600) | ASTM B167 / ASME SB167 | ASTM B517 / B516 |
| Inconel 601 (N06601) | ASTM B167 | – |
| Inconel 625 (N06625) | ASTM B444 / ASME SB444 | ASTM B705 / B704 |
| Inconel 718 (N07718) | Supplied to order, typically to AMS or customer specification | – |
| Item | Details |
|---|---|
| Pipe dimensions | ASME B36.19M and B36.10M; schedules 5S, 10S, 40S, 80S and heavier |
| Tube dimensions | OD and wall in mm, inches or BWG |
| Condition | Annealed or solution annealed (625 Grade 1 or Grade 2), as ordered |
| Forms | Straight lengths, U-bent tubes, coiled tubing |
| Documents | Mill test certificate (MTC); third-party inspection on request |
Composition and properties
The composition limits for Inconel 600 and 625 are shown below. Inconel 625 in the annealed condition (Grade 1) has the minimum properties listed; Grade 2 (solution annealed) is supplied for high-temperature creep service.
| Alloy | Ni | Cr | Fe | Mo | Nb + Ta | C | Mn | Si | S | Other elements |
|---|---|---|---|---|---|---|---|---|---|---|
| 600 (N06600) | 72.0 min | 14.0–17.0 | 6.0–10.0 | – | – | 0.15 | 1.00 | 0.50 | 0.015 | Cu 0.50 |
| 625 (N06625) | 58.0 min | 20.0–23.0 | 5.0 | 8.0–10.0 | 3.15–4.15 | 0.10 | 0.50 | 0.50 | 0.015 | P 0.015, Al 0.40, Ti 0.40, Co 1.0 |
Nickel includes cobalt where stated in the standard. Footnotes as given in each ASTM specification.
| Product | Tensile strength, MPa (ksi) | Yield strength 0.2%, MPa (ksi) | Elongation, % |
|---|---|---|---|
| Plate and sheet – ASTM B443 | 827 (120) | 414 (60) | 30 |
| Pipe and tube – ASTM B444 | 827 (120) | 414 (60) | 30 |
| Bar – ASTM B446 | 827 (120) | 414 (60) | 30 |
Values for Grade 1 annealed material; size limits and Grade 2 (solution annealed) properties as given in each standard.
More detail on the most requested alloy is on the Inconel 625 pipes and tubes page.
Choosing the alloy
- Inconel 600 – for high-temperature oxidation resistance and chloride stress corrosion cracking resistance: furnace components, heat-treatment muffles and retorts, caustic and chlorination equipment, and steam generator tubing.
- Inconel 601 – for the highest-temperature oxidation and carburising environments, such as radiant tubes and burner parts.
- Inconel 625 – for corrosion and strength together: seawater, sour gas, phosphoric and mixed acids, flue gas, flare and exhaust systems, and high-pressure lines where its strength allows thinner walls.
- Inconel 718 – age-hardenable alloy for high-strength tubing in oilfield and aerospace components.
Grade 1 and Grade 2 alloy 625
ASTM B444 and the related product standards supply alloy 625 in two conditions. Grade 1 is annealed at a lower temperature, giving the higher room-temperature strength shown above; it is the usual choice for corrosion service up to moderate temperatures. Grade 2 is solution annealed at a higher temperature, giving lower room-temperature strength but better creep and rupture properties, and is used for high-temperature service. The grade affects the allowable stress in design, so it must be stated on the order.
For tubing in heat exchangers handling seawater or acid streams, alloy 625 Grade 1 is common; for high-temperature reformer or furnace pigtails, Grade 2 or alloy 600/601 is used depending on temperature and atmosphere.
Quality, documents and ordering
Inconel pipes and tubes are tested as their standard requires – chemical analysis, tensile, flattening or flaring tests, and a hydrostatic or non-destructive electric test on each length. Each length is marked with the alloy, specification, size and heat number. We check each consignment against the mill test certificate and the order before dispatch; third-party inspection is available on request, and material can be supplied to NACE MR0175 / ISO 15156 on request.
Please give the alloy and UNS number, the ASTM specification, seamless or welded, size and schedule or OD and wall, length, condition (for 625, Grade 1 or Grade 2), quantity and any supplementary tests.
Applications and related products
Inconel pipes and tubes are used in chemical and petrochemical plants, refineries, offshore and subsea oil and gas, flare and exhaust systems, power generation, heat-treatment furnaces, pollution control and aerospace equipment. They are installed with Inconel pipe fittings, Inconel flanges and Inconel fasteners. We also supply Inconel sheets and plates, Inconel round bars and Inconel wires. Alloy guidance is on the Inconel page, and other seamless materials on the seamless pipes and tubes page.
Frequently Asked Questions
ASTM B444 (ASME SB444) covers seamless Inconel 625 pipe and tube. Welded 625 pipe is covered by ASTM B705 and welded tube by ASTM B704.
ASTM B167 covers seamless nickel-chromium-iron alloy pipe and tube, including Inconel 600 (N06600) and 601 (N06601). Welded 600 pipe is supplied to ASTM B517 and welded tube to B516.
Grade 1 is annealed and has higher room-temperature strength for corrosion service. Grade 2 is solution annealed for better creep and rupture strength at high temperatures. The grade must be stated on the order.
Grade 1 annealed Inconel 625 pipe to ASTM B444 has a minimum tensile strength of 827 MPa (120 ksi) and a minimum 0.2% yield strength of 414 MPa (60 ksi).
Yes. Inconel tubes can be supplied in straight lengths, U-bent to drawing, or as coiled tubing, depending on the alloy and size.
Yes. All Inconel pipes and tubes are supplied with mill test certificates. Third-party inspection can be arranged on request.
Request a Quote for Inconel Pipes & Tubes
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Inconel® is a trademark of Special Metals Corporation.