Inconel 718 precipitation hardening nickel-chromium alloy welded steel pipe
Inconel 718 precipitation hardening nickel-chromium alloy welded steel pipe
Inconel 718 welded steel pipe is made from a precipitation-hardening nickel-chromium alloy known for its high strength, good ductility, excellent corrosion resistance, and outstanding fatigue strength over a wide temperature range, including cryogenic to high-temperature applications. Its key properties include excellent weldability and resistance to post-weld cracking, making it suitable for demanding applications in aerospace and other industries.
What is precipitation hardening in INCONEL 718?
Alloy 718 is hardened by the precipitation of secondary phases (such as gamma-ray and gamma-ray duplex) within the metal matrix. Precipitation of these nickel (aluminum, titanium, and niobium) phases is achieved by heat treating in the temperature range of 1100 to 1500°F (750 to 850°C).
Comparing Standards Specification Inconel 718 tube
| ASTM Specification | AMS 5590, AMS 5589 |
|---|---|
| International Specification | WERKSTOFF Nr 2.4668 , UNS N07718 |
| Standard | GB, DTD, ASME, AISI, ASTM, TOCT, JIS, NF, SAE, DIN, AMS, DS, EN |
| Size of Seamless Pipe | Wall thickness.: 0.05- 20 milimeter, 4 - 219 milimeter |
| Size of Welded Pipe | 5.0 to 1219.02 milimeter |
| size of EFW Pipe | 5.0 to 1219.02 milimeter |
| Seamless Tube Size | 3.35 milimeter To 101.6 milimeter OD |
| Welded Tube Size | 6.35 milimeter To 152 milimeter OD |
| Bwg & Swg | 18 Swg., 14 20 Swg., Swg. Swg., 12 16 Swg., 10 Swg. |
| Tubing wall thickness | 0.020" –0.220", (custom wall thicknesses available) |
| Pipe Schedule | SCH20, XS, STD, XXS, SCH60, SCH140, SCH80, SCH80, SCH5, SCH40S, SCH40, SCH120, SCH10S, SCH10, SCH30, SCH160 |
| Length | Standard & Cut length , Single Random, Double Random Pipe |
| Finish | AP (Annealed & Pickled), BA (Bright & Annealed), NO.1, 2B, Polished, MF, HL, NO.4, Mirror finish, BA, 8K etc |
| End | Plain End, Beveled End, Treaded Pipe, Screwed ends |
Inconel Alloy 718 Chemical composition
| Alloy | % | Ni | Cr | Fe | Mo | Nb | Co | C | Mn | Si | S | Cu | Al | Ti |
| 718 | Min. | 50 | 17 | balance | 2.8 | 4.75 | 0.2 | 0.7 | ||||||
| – | Max. | 55 | 21 | – | 3.3 | 5.5 | 1 | 0.08 | 0.35 | 0.35 | 0.01 | 0.3 | 0.8 | 1.15 |
Inconel Alloy 718 Physical Properties
| Density / Specific Gravity | 8193 kg/m³ |
| Melting point | 1321-1393 °C |
Alloy 718 mechanical properties in the room temperature
| Alloy | Tensile strength Rm N/mm² |
Yield strength R P0. 2N/mm² |
Elongation A 5 % |
Brinell hardnessHB |
| Solution treatment | 965 | 550 | 30 | ≤363 |
Inconel 718 Welded Pipe Applications
Inconel 718 combines high strength, good weldability, and corrosion resistance, making it an ideal choice for high-stress and high-temperature applications. Common applications for Inconel 718 welded pipe and other forms include:
Aerospace components, such as jet engine components and airframe parts.
High-temperature fasteners and bolts.
Applications requiring fatigue and stress corrosion resistance, especially in harsh environments.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications, and we can provide customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneemetal.com.
