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Quality UNS N07718 High Temperature Inconel Superalloy For Aerospace Turbine High Strength factory
Quality UNS N07718 High Temperature Inconel Superalloy For Aerospace Turbine High Strength factory

UNS N07718 High Temperature Inconel Superalloy For Aerospace Turbine High Strength

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: Incoloy 800 / Incoloy 800H / Incoloy 800HT / Incoloy 825 / Hastelloy C-276 / Hastelloy C-22 / Inconel 625 / Inconel 718
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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UNS N07718 Inconel Superalloy

Inconel Superalloy High Strength
Product Summary
UNS N07718 is a precipitation-hardenable nickel-chromium alloy containing significant amounts of iron, niobium, and molybdenum, along with minor additions of aluminum and titanium. Developed specifically for high-temperature and high-stress applications, this superalloy has become the standard ...

Product Details

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UNS N07718 Inconel Superalloy

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Inconel Superalloy High Strength
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: Incoloy 800 / Incoloy 800H / Incoloy 800HT / Incoloy 825 / Hastelloy C-276 / Hastelloy C-22 / Inconel 625 / Inconel 718
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

UNS N07718 is a precipitation-hardenable nickel-chromium alloy containing significant amounts of iron, niobium, and molybdenum, along with minor additions of aluminum and titanium. Developed specifically for high-temperature and high-stress applications, this superalloy has become the standard material across aerospace, energy, and oil & gas industries.

The alloy combines excellent corrosion resistance with exceptional mechanical strength and outstanding weldability, including resistance to post-weld cracking — a unique property among precipitation-hardened alloys. UNS N07718 maintains its mechanical properties from cryogenic temperatures (-250°C) up to 700°C (1290°F), making it the preferred choice for demanding applications where both heat and stress are factors.

Specifications & Dimensions
Parameter Details
Standard ASTM B670 (Plate/Sheet/Strip), ASTM B637 (Bar/Forging), ASTM B983 (Tube), ASME SB670
Grade / UNS UNS N07718
Product Forms Tube / Pipe / Bar / Rod / Wire / Plate / Sheet / Strip / Forgings
Outer Diameter (Tube/Pipe) 6.0 mm – 610 mm (1/8″ – 24″)
Wall Thickness (Tube/Pipe) 0.5 mm – 50 mm (SCH 5S – XXS)
Bar Diameter 3.0 mm – 300 mm (1/8″ – 12″)
Length 3 m – 12 m, or random lengths
Process Cold drawn / Cold rolled / Hot rolled / Forged
Finish Annealed / Solution treated & aged / Turned / Ground / Polished
Packaging Hexagonal bundles + plastic end caps + seaworthy wooden crates or spools
Chemical Composition

The unique age-hardenable characteristics come from a precise balance of niobium (columbium), titanium, and aluminum, which form strengthening precipitates (gamma double-prime and gamma prime) during heat treatment.

Element Content (%) Role
Nickel (Ni) 50.0 – 55.0 Base element – provides corrosion resistance & austenitic stability
Chromium (Cr) 17.0 – 21.0 Oxidation resistance & protection against sulfur compounds
Iron (Fe) Balance (Rem) Provides cost-effective stability & structural integrity
Niobium + Tantalum (Nb+Ta) 4.75 – 5.50 Primary strengthening element (gamma double-prime precipitate)
Molybdenum (Mo) 2.80 – 3.30 Pitting resistance & solid-solution strengthening
Titanium (Ti) 0.65 – 1.15 Secondary strengthener (gamma prime precipitate)
Aluminum (Al) 0.20 – 0.80 Secondary strengthener (gamma prime precipitate)
Cobalt (Co) 1.00 max Limited for nuclear compatibility
Carbon (C) 0.08 max Controlled for carbide stability
Manganese (Mn) 0.35 max Trace element
Silicon (Si) 0.35 max Trace element
Phosphorus (P) 0.015 max Controlled for ductility
Sulfur (S) 0.015 max Controlled for hot workability
Boron (B) 0.006 max Grain boundary strengthener
Copper (Cu) 0.30 max Trace element

Niobium is also referred to as Columbium (Cb) in older specifications. The combined Nb+Ta content is critical for precipitation hardening.

Typical Mechanical Properties

Inconel 718 is supplied in two main conditions: Solution Annealed (for fabrication) and Aged (precipitation-hardened for maximum strength). The aged condition delivers the alloy's signature high-temperature performance.

Product Form Condition Tensile Strength (KSI / MPa) Yield Strength 0.2% Offset (KSI / MPa) Elongation (%) Hardness
Sheet (AMS 5596) Solution Annealed 140 KSI (965 MPa) 80 KSI (552 MPa) 30 102 HRB max
Sheet (AMS 5596) Aged 180 KSI (1241 MPa) 150 KSI (1034 MPa) 12 ≥36 HRC
Sheet (AMS 5597) Solution Annealed 140 KSI (965 MPa) 75 KSI (517 MPa) 30 ≤25 HRC
Sheet (AMS 5597) Aged 180 KSI (1241 MPa) 150 KSI (1034 MPa) 15 ≥38 HRC
Bar / Rod (ASTM B637) Solution Annealed + Aged 185 KSI min (1276 MPa) 150 KSI min (1034 MPa) 12 min 36 HRC min
Key Performance Notes:

  • At 1200°F (649°C): Retains approximately 70% of room temperature yield strength.

  • Creep Rupture: Excellent resistance to creep deformation up to 1300°F (700°C).

  • Fatigue Strength: Superior to most other superalloys in the high-cycle fatigue regime.

  • Cryogenic Performance: Elongation can exceed 20% at -320°F (-196°C) with no ductile-to-brittle transition.

Available Products & Specifications

We supply Inconel 718 in all standard mill forms, cut to size, with full traceability to AMS, ASTM, and ASME standards. Custom dimensions and special heat treatments are available upon request.

Product Form Size Range Key Specifications
Round Bar / Rod Dia: 6mm – 300mm (0.25" – 12") ASTM B637, ASME SB637, AMS 5662, AMS 5663, AMS 5664, ISO 9723, DIN 17752
Wire Dia: 0.1mm – 12mm AMS 5832, ISO 9724, DIN 17753
Plate / Sheet / Strip Thk: 0.5mm – 100mm ASTM B670, ASTM B906, AMS 5596, AMS 5597, AMS 5598, AMS 5862, ISO 6208, DIN 17750
Seamless Pipe / Tube OD: 6mm – 219mm SAE AMS 5589, SAE AMS 5590, ASTM B983
Welded Pipe / Tube OD: up to 914mm SAE AMS 5590 (welded annealed), ASTM B983
Fittings (Flanges, Elbows, Tees) All schedules ASTM B366, ASME SB366
Forgings (Rings, Discs, Blocks) Custom sizes ASTM B637, ASME SB637, AMS 5663, ISO 9725, DIN 17754
Fastener Stock Custom ASTM B637 (Condition A or Aged), AMS 5662
Key Features
Feature Benefit
Precipitation-hardenable Achieves high strength through heat treatment
Excellent creep-rupture strength Maintains performance up to 700°C (1290°F)
Outstanding weldability Resists post-weld cracking — unique for precipitation-hardened alloys
Good corrosion resistance Performs well in aggressive environments
Wide temperature range From cryogenic (-250°C) to elevated temperatures
Good fatigue resistance Suitable for cyclic loading applications
Heat Treatment

UNS N07718 requires specific heat treatment to achieve its precipitation-hardened properties:

Treatment Temperature Duration Purpose
Solution Treatment 954 – 1066°C (1750 – 1950°F) 1 hour + air cool Dissolves strengthening phases
Aging (Precipitation Hardening) 718°C (1325°F) 8 hours + furnace cool to 621°C Precipitates γ" and γ' phases for high strength
Second Aging 621°C (1150°F) 8 hours + air cool Completes the precipitation process
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