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Inconel 718/825 Pipe Tube is a premium nickel-chromium-based alloy designed for extreme environments. Known for its exceptional corrosion resistance and high-temperature strength, this alloy is widely used in chemical, marine, and aerospace industries. The combination of nickel, chromium, and other alloying elements provides outstanding durability, making it ideal for demanding applications where ordinary stainless steel would fail.
Inconel 718 Pipe Tube is specifically formulated to deliver superior mechanical properties. It exhibits excellent tensile strength, creep resistance, and oxidation resistance even at temperatures up to 1300°F (704°C). This makes it suitable for high-pressure applications such as gas turbines, jet engines, and nuclear reactors. Its ability to maintain structural integrity under thermal stress ensures long service life in harsh conditions.
Inconel 718 and 825 pipes and tubes are premium nickel-based alloys designed to perform in extreme industrial conditions. They are highly valued for their exceptional corrosion resistance, high strength, and excellent performance at elevated temperatures. These pipes and tubes are commonly used in chemical processing, petrochemical, marine, aerospace, and power generation applications.
Inconel 718 contains roughly 50–55% nickel, 17–21% chromium, along with iron, niobium, molybdenum, titanium, and aluminum. Inconel 825 consists of 38–46% nickel, 19–23% chromium, 2.5–3.5% molybdenum, and trace elements such as titanium and copper. These compositions provide superior corrosion resistance in acidic, chloride-rich, and oxidizing environments.
Inconel 825 Pipe Tube offers enhanced resistance to corrosion in acidic and chloride-containing environments. With additions of molybdenum and copper, it shows exceptional performance in sulfuric acid, phosphoric acid, and seawater applications. This makes it a preferred choice in chemical processing plants, desalination plants, and offshore oil and gas facilities where long-term reliability is critical.
Manufacturing and Fabrication of Inconel 718/825 Pipe Tube involves precision engineering to ensure dimensional accuracy and consistent quality. These tubes are available in various sizes, thicknesses, and surface finishes to meet diverse industrial requirements. They can be welded, machined, and formed using standard industrial processes without compromising the alloy’s superior properties.
Inconel 718/825 pipes and tubes offer exceptional mechanical strength. Inconel 718 has a tensile strength of 1240–1380 MPa and yield strength of 1030–1170 MPa, while Inconel 825 offers tensile strength of 585–690 MPa and yield strength of 241–414 MPa. Elongation ranges from 20–40%, providing both toughness and flexibility under stress.
Both alloys are resistant to pitting, crevice corrosion, and stress corrosion cracking. Inconel 718 is highly resistant to high-temperature oxidation and creep, whereas Inconel 825 excels in acidic and reducing environments. These properties make them suitable for chemical processing, offshore oil and gas pipelines, and marine applications.
Specification Table
| Property | Inconel 718 (N07718) | Inconel 825 (N08825) |
|---|---|---|
| Alloy Type / UNS | Nickel-Chromium-Iron age-hardenable superalloy — UNS N07718 | Nickel-Iron-Chromium corrosion-resistant alloy — UNS N08825 |
| Typical Uses / Applications | High-temperature structural parts, gas turbines, aerospace, oil & gas, high strength cryogenic/hot environments | Chemical processing, pickling lines, seawater systems, sour gas, flue gas desulphurization, marine applications |
| Corrosion Resistance | Excellent resistance to oxidation and carburization at elevated temperatures; good general corrosion resistance | Excellent resistance to reducing acids, stress-corrosion cracking and chloride ion attack; especially strong in wet corrosive environments |
| Mechanical Characteristics | High strength maintained to elevated temperatures; strengthened by precipitation (aging) heat treatments | Good strength and toughness over a wide temperature range; not age-hardenable like 718 but work-strengthened and stabilized |
| Typical Heat Treatments | Solution annealed + age hardening (commonly two-step aging) to develop high strength | Annealed / solution treated for optimum corrosion resistance; stabilization heat treatments used as required |
| Chemical Composition (key elements) | Nickel base with chromium, iron, niobium (columbium), molybdenum, titanium and aluminium (precipitation strengthening elements) | Nickel-iron-chromium base with additions of molybdenum and copper (for reducing environments) and stabilizers to resist intergranular attack |
| Available Forms & Sizes | Seamless and welded pipe/tube — wide range of OD and wall thicknesses for instrumentation, hydraulic, structural and high-pressure lines | Seamless and welded pipe/tube — commonly supplied for process piping, heat exchangers and marine systems in multiple ODs and wall thicknesses |
| Surface & End Finishes | Mill finish, pickled/annealed, polished, hygienic finishes; plain or beveled ends, welded ends, threaded on request | Mill finish, pickled/annealed, polished; beveled, plain or threaded ends available per customer spec |
| Tolerances & Testing | Standard dimensional tolerances per buyer/spec; NDT (UT, PMI), hydrostatic or RT as requested; mechanical tests and chemical analysis with MTR | Dimensional tolerances per specification; common tests include PMI/chemical analysis, NDT, pressure testing and full MTR documentation |
| Common Specifications / Codes | Supplied to common international piping and tube standards (ASTM/ASME/EN) — check product listing for exact spec numbers | Supplied to common international piping and tube standards (ASTM/ASME/EN) — check product listing for exact spec numbers |
| Density & Melting Range | Nickel-base density (approximate) — high melting/softening temperatures suitable for high-temp service | Nickel-iron base density — good high-temperature stability for process environments |
| Equivalents / Notes | Commonly referenced as Inconel® 718 — widely accepted in aerospace and oil & gas | Commonly referenced as Incoloy® / Inconel® 825 — favored where mixed-acid and chloride resistance is required |
| Quality / Certification | Available with Mill Test Report (MTR), PMI, third-party inspection (if required); supplied to customer quality plans | Available with MTR, PMI and third-party inspection on request; documentation to buyer’s QA/QC requirements |
| Important Note | The exact chemical composition, mechanical properties (yield/tensile/elongation), dimensional tolerances and heat-treatment schedules depend on the purchased product specification, temper and tube OD/wall. For engineering, procurement or certification use, always refer to the manufacturer’s mill test certificate (MTR) and the applicable ASTM/ASME/EN specification called out in the purchase order. | |
Chemical Composition (Typical ranges for SSS32760)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Inconel 718 (% by Weight) | Inconel 825 (% by Weight) |
|---|---|---|
| Nickel (Ni) | 50.0 – 55.0 | 38.0 – 46.0 |
| Chromium (Cr) | 17.0 – 21.0 | 19.5 – 23.5 |
| Iron (Fe) | Balance | 22.0 – 30.0 (Balance) |
| Molybdenum (Mo) | 2.8 – 3.3 | 2.5 – 3.5 |
| Niobium + Tantalum (Nb + Ta) | 4.75 – 5.50 | — |
| Titanium (Ti) | 0.65 – 1.15 | 0.6 – 1.2 |
| Aluminum (Al) | 0.20 – 0.80 | ≤ 0.2 |
| Copper (Cu) | ≤ 0.30 | 1.5 – 3.0 |
| Carbon (C) | ≤ 0.08 | ≤ 0.05 |
| Manganese (Mn) | ≤ 0.35 | ≤ 1.0 |
| Silicon (Si) | ≤ 0.35 | ≤ 0.5 |
| Sulphur (S) | ≤ 0.015 | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.015 | ≤ 0.03 |
| Cobalt (Co) | ≤ 1.0 | ≤ 1.0 |
| Other Elements | Trace elements may be present depending on production method | Trace elements possible; stabilized with Ti for intergranular corrosion resistance |
| Note: Composition values are nominal ranges as per ASTM/ASME standards (Inconel 718 – ASTM B983 / B637; Inconel 825 – ASTM B423 / B424). Actual certified values should be verified from the Mill Test Certificate (MTC) supplied with each batch. | ||
Mechanical Properties (Typical)
| Property | Inconel 718 | Inconel 825 |
|---|---|---|
| Tensile Strength (MPa) | 1275 MPa min (annealed & aged) | 550 MPa min (annealed) |
| Yield Strength (0.2% Proof, MPa) | 1035 MPa min (annealed & aged) | 220 MPa min (annealed) |
| Elongation (% in 50 mm) | 12% min | 30% min |
| Reduction of Area (%) | 15% min | 35% typical |
| Hardness (Rockwell) | ≈ Rc 36 (after precipitation hardening) | ≤ Rc 20 (annealed) |
| Density (g/cm³) | 8.19 | 8.14 |
| Melting Range (°C) | 1260 – 1336 °C | 1350 – 1400 °C |
| Modulus of Elasticity (GPa) | 200 GPa | 196 GPa |
| Impact Strength | Excellent toughness even at cryogenic temperatures | Good impact resistance at room and low temperatures |
| Note: The above values are typical room-temperature mechanical properties as per ASTM standards (Inconel 718 – ASTM B983/B637; Inconel 825 – ASTM B423/B424). Actual results may vary depending on manufacturing method, heat treatment, and product dimensions. Always refer to the Mill Test Certificate (MTC) for certified data. | ||
Equivalent Grades
| Standard | Inconel 718 Equivalent Grade | Inconel 825 Equivalent Grade |
|---|---|---|
| UNS | N07718 | N08825 |
| Werkstoff Nr. (W.Nr.) | 2.4668 | 2.4858 |
| Trade Name | Inconel® 718 / Alloy 718 | Inconel® 825 / Incoloy® 825 |
| ASTM Standard | ASTM B637, B670, B983 | ASTM B423, B424, B705 |
| ASME Standard | ASME SB637, SB983 | ASME SB423, SB424, SB705 |
| EN / DIN | EN 2.4668 / NiCr19Fe19Nb5Mo3 | EN 2.4858 / NiCr21Mo |
| BS (British Standard) | NA 51 | NA 16 |
| AFNOR (France) | NC19FeNb | NUCr21Mo |
| JIS (Japan) | NCF 718 | NCF 825 |
| GOST (Russia) | ЭИ-437Б (EI437B) | ХНМТ (KhNMT) |
| ISO / Other | ISO NiCr19Fe19Nb5Mo3 | ISO NiCr21Mo |
| Note: Equivalent grades are provided for reference only. Mechanical and chemical properties should be verified according to the applicable ASTM/ASME specifications and Mill Test Certificates (MTC) before use. | ||
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Pipe Size (NPS) | Outside Diameter (mm) | Schedule | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|
| 1/2" | 21.3 | Sch 40 | 2.77 | 1.27 |
| 3/4" | 26.7 | Sch 40 | 2.87 | 1.68 |
| 1" | 33.4 | Sch 40 | 3.38 | 2.35 |
| 1 1/2" | 48.3 | Sch 40 | 3.68 | 3.62 |
| 2" | 60.3 | Sch 40 | 3.91 | 5.44 |
| 3" | 88.9 | Sch 40 | 5.49 | 10.25 |
| 4" | 114.3 | Sch 40 | 6.02 | 14.37 |
| 6" | 168.3 | Sch 40 | 7.11 | 25.17 |
| 8" | 219.1 | Sch 40 | 8.18 | 38.10 |
| 10" | 273.0 | Sch 40 | 9.27 | 54.52 |
| 12" | 323.9 | Sch 40 | 9.53 | 67.62 |
| Note: Dimensions and weights are approximate and based on carbon steel reference data. Actual weight of Inconel 718 / 825 pipes and tubes may vary slightly due to higher material density. For precise engineering or procurement, verify using specific ASTM standards (Inconel 718 – ASTM B983/B637, Inconel 825 – ASTM B423/B705) and Mill Test Certificates (MTC). | ||||
Types Of Inconel 718/825 Pipe Tubes and Tubes
SS S32760 Seamless Pipe
SS S32760 Welded Pipe
SS S32760 ERW Pipe
SS S32760S EFW Pipe
Low Temperature Carbon Steel A333S Seamless Tube
S32760H Super Duplex Steel Welded Tube
S32760 Super Duplex Steel Capillary Tube
S32760H Super Duplex Steel Heat Exchanger Tubes
Frequently Asked Questions (FAQ)
Q1:What are Inconel 718 and Inconel 825 Pipes & Tubes?
Inconel 718 and Inconel 825 Pipes & Tubes are nickel-based alloys known for high strength, corrosion resistance, and excellent performance in extreme environments.
Q2:What is the main difference between Inconel 718 and Inconel 825?
Inconel 718 offers high strength and temperature resistance, while Inconel 825 provides superior corrosion resistance against acids and oxidizing environments.
Q3:What standards cover Inconel 718 / 825 Pipes and Tubes?
Inconel 718 complies with ASTM B983 / B637, and Inconel 825 conforms to ASTM B423 / B705 / B829 standards.
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