Customized UNS N07718 Alloy 718 Seamless Pipe Hot-extruded Tube for Optimal Performance and Durability

UNS N07718 Alloy 718 Seamless Pipe Hard-deformable Nickel-base Alloy Hot-extruded Seamless Tube

Material Standard: ASTM B637 / ASME SB637 / AMS 5596 (Aerospace)
UNS Designation: N07718
Common Names: Inconel 718, Alloy 718, Nickel-Chromium Superalloy

1. Key Composition (Weight %)

2. Manufacturing Process

• Seamless Pipe Production:

  • Hot Extrusion: Billet heated to ~1100°C and extruded through a die to form hollow shells.

  • Cold Drawing/Pilgering: Further precision sizing for tight tolerances (OD ±0.1mm, WT ±5%).

  • Solution Annealing: 955-1010°C + rapid cooling (water or air) to dissolve precipitates.

  • Aging Treatment: Dual-stage (720°C ±10°C for 8h → furnace cool to 620°C ±10°C for 8h) to precipitate γ″/γ′ phases.

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3. Properties

4. Applications

• Aerospace: Turbine blades, combustion chambers (up to 700°C).

• Oil & Gas: Downhole tubing, subsea risers (resists sulfide stress cracking).

• Nuclear: Reactor coolant pipes (neutron irradiation resistance).

• Chemical Processing: Valves, reactors handling chlorides/acidic media.

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• 5. Advantages Over Alternatives

• vs. Alloy 625: Higher strength (but lower ductility) due to γ″ hardening.

• vs. Stainless Steel (e.g., 316L): 3x higher yield strength at 500°C.

• Weldability: Unlike many superalloys, Alloy 718 can be welded via TIG/GTAW without post-weld cracking (low Al/Ti content).

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6. Compliance & Testing

• Certifications: NACE MR0175 (sulfide stress cracking resistant), PED 2014/68/EU.

• Testing:

  • NDT: 100% ultrasonic testing (ASTM E213) for defects.

  • PMI: XRF verification of composition.

  • Mechanical Tests: Per ASTM E8/E21.

More grades:

Hunan Dinghan New Material Technology Co.,Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.

We have complete advanced technology facilities to produce best quality alloys to meet exacting your specifications such as VIM (Vacuum lnduction Melting) furnace to provide high purity Alloys,ESR (Electro Slag Re-melting) furnace to enhances the structure and purity of the Alloys, and CNC machining equipments (Lathe, Wire cutting, Drilling,Milling) to provide high precision finished products.

We are dedicated to providing our customers with best quality products,fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars,rods,forged flanges, valve parts, forged shapes (shafts, discs, blocks, hubs,rings, cylinders and tailor shapes) according to ASTM,ASME,API,AMS, NACE and other industry standards.

We can help you gain a competitive edge in the market by responding to a rush quote in less than 24 hours and even complex requests for price and delivery quotations are responded to within 48 hours.