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

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Delivery Time: (Sample order) 7 days

Brand: DINGSCO

Product Description

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 %)

Element	Content (%)	Role
Nickel (Ni)	50-55%	Base metal, provides corrosion resistance & high-temperature strength
Chromium (Cr)	17-21%	Oxidation/corrosion resistance
Iron (Fe)	Balance	Cost-effective strengthening
Niobium (Nb) + Tantalum (Ta)	4.75-5.5%	Forms γ″ phase (primary strengthening via precipitation hardening)
Molybdenum (Mo)	2.8-3.3%	Enhances creep resistance
Titanium (Ti)	0.65-1.15%	Forms γ′ phase (secondary strengthening)
Aluminum (Al)	0.2-0.8%	Stabilizes γ′ phase
Carbon (C)	≤0.08%	Controls carbide formation

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.

3. Properties

Property	Value (Room Temp)	High-Temp Performance
Tensile Strength	≥1035 MPa (150 ksi)	690 MPa (100 ksi) @ 650°C
Yield Strength (0.2% offset)	≥725 MPa (105 ksi)	550 MPa (80 ksi) @ 650°C
Elongation	≥12%	Maintains >8% @ 540°C
Hardness	30-40 HRC	—
Corrosion Resistance	Excellent in:	Poor in:
	- Seawater	- Hydrofluoric acid
	- H₂S-containing oil/gas environments	- Hot concentrated sulfuric acid

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.
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).

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.