Alloy Grades
Your Current Location： Home >> Alloy Grades >> Inconel >> Tube/Pipe
INCOLOY 718（UNSN07718） PIPE/TUBE
High-Strength Nickel-Chromium Alloy for Cryogenic to 704°C Applications
INCOLOY 718 pipe and tube are widely used for corrosion-resistant piping systems, heat exchanger tubing, scrubbers, and process lines in aggressive chemical environments. The alloy offers exceptional resistance to oxidizing and reducing media, outstanding resistance to pitting and crevice corrosion, and strong resistance to chloride stress corrosion cracking.
As a professional Chinese nickel-based alloy manufacturer, we supply INCOLOY 718 in multiple product forms with stable chemistry, consistent mechanical properties, and flexible dimensional customization for global industrial users.
Typical supply range (custom sizes and tolerances available upon request):
Item | Range / Options | Notes |
OD | 6 – 914 mm | OD range depends on seamless/welded; specify tolerance if critical. |
Wall Thickness | 0.7 – 20 mm | Wall thickness depends on OD and type; specify tolerance if critical. |
Length | Up to 12000 mm | Fixed length or random length by agreement. |
Type | Seamless / Welded | Seamless per ASTM B622; welded per ASTM B619/B626 on request. |
Surface finish | Pickled / Bright / Polished | Surface condition per specification and application. |
End | Plain / Beveled / Threaded | End preparation available for welding/installation. |
Delivery condition | Solution annealed (standard) | NDT/PMI/hydrotest available per project requirement. |
Dimension definition: OD × WT × LENGTH.
• Excellent resistance to pitting and crevice corrosion in chloride media
• Outstanding resistance to chloride stress corrosion cracking (SCC)
• Strong resistance to oxidizing and reducing acids in mixed process media
• Withstands wet chlorine gas, hypochlorite, and chlorine dioxide solutions
• High chromium content improves resistance to oxidizing media; suitable for use in the as-welded condition
• Good fabrication and welding performance for CPI equipment
Element | Ni | Cr | Mo | Fe | W | Mn | Si | C |
INCOLOY 718 | Balance | 20.0–22.5 | 12.5–14.5 | 2.0–6.0 | 2.5–3.5 | ≤0.50 | ≤0.08 | ≤0.015 |
Extremely low carbon and silicon help maintain corrosion resistance in as-welded structures.
Property | Value |
Tensile Strength (Rm) | ≥ ≥ 1275 MPa |
Yield Strength (Rp0.2) | ≥ ≥ 1034 MPa |
Elongation | ≥ ≥ 12 % |
Hardness | ≤ 331 HB |
Mechanical properties may vary slightly with product form and heat treatment condition.
Standard System | Specification |
ASTM / ASME | ASTM B622 / ASME SB-622 |
EN | EN 10204 |
UNS | N06022 |
DIN | 2.4668 |
JIS | NW 6022 |
Item | Range |
OD | 6 – 914 mm |
Wall Thickness | 0.7 – 20 mm |
Length | Up to 12000 mm |
Type | Seamless / Welded |
End | Plain / Beveled / Threaded |
Custom sizes, tight tolerances, and cut-to-length service are available upon request.
• Solution Annealed
• Age Hardened
• Gas turbine discs, compressor blades and rotor shafts
• Aerospace engine components and rocket motors
• Cryogenic storage tanks and space vehicle structures
• High-strength fasteners and springs for high-pressure service
• Downhole oil and gas tools and wellhead components
• Nuclear reactor cores, pumps, and valves
• Chemical process equipment requiring high strength and corrosion resistance
INCOLOY 718 can be fabricated and welded using standard nickel-alloy practices.
Common welding methods include:
• GTAW (TIG)
• GMAW (MIG)
• SMAW
Matching filler metals such as ERNiFeCr-2 (Alloy 718) are typically recommended.
• EN 10204 3.1 Material Test Certificate
• Chemical composition analysis
• Mechanical testing (tensile, hardness)
• PMI / XRF testing available
• Dimensional inspection
• Third-party inspection on request (BV, SGS, TUV, DNV)
• PVC protective film on surface (where applicable)
• Wooden pallets or export-grade crates
• Seaworthy packaging for long-distance shipment
• Global delivery by sea, air, or multimodal transport
• Professional nickel-based alloy manufacturer in China
• Stable raw material sourcing and melting control
• Wide stock and fast production cycle
• Competitive pricing for global projects
• Experience with international EPC, OEM, and distributors
For quotation or technical consultation, please provide:
• Required grade (INCOLOY 718)
• Diameter × Length
• Quantity
• Surface finish / delivery condition
• Application environment
Our technical team will respond with datasheets, pricing, and delivery schedule promptly.
