Nickel Alloy 718 (UNS N07718 / 2.4668 / GH4169) is a precipitation-hardenable nickel-chromium superalloy known for its exceptional high-temperature strength, corrosion resistance, and good weldability. It maintains mechanical properties from -250°C up to 700°C, making it a preferred material for aerospace, oil & gas, and power generation industries.
Nickel Alloy 718 (UNS N07718 / 2.4668 / GH4169) is a precipitation-hardenable nickel-chromium superalloy known for its exceptional high-temperature strength, corrosion resistance, and good weldability. It maintains mechanical properties from -250°C up to 700°C, making it a preferred material for aerospace, oil & gas, and power generation industries.
Key Features:
Excellent high-temperature strength up to 700°C
Outstanding corrosion and oxidation resistance
Good weldability compared to other precipitation-hardening superalloys
Precipitation-hardenable for tailored mechanical properties
Reliable performance in extreme environments
Maintains dimensional stability under temperature fluctuations
As a premier manufacturer and supplier of high-temperature alloys in China, we provide fully certified and traceable materials that meet ASTM, AMS, and ISO standards. With AS9120B and ISO9001 accreditation and more than 30 years of experience, we ensure unwavering product quality and reliability.
Available Product Forms
ZYTC Alloy offers Inconel 718 in a wide variety of product forms to meet diverse industrial requirements. Our manufacturing and stocking capabilities ensure reliable supply for both standard and custom orders.
Inconel 718 achieves its remarkable properties through a carefully balanced chemical composition. The addition of niobium (Nb) enables precipitation hardening, while chromium and molybdenum provide corrosion resistance. The following table shows typical composition values:
Element
Content (%)
Nickel (Ni)
50.0 – 55.0
Chromium (Cr)
17.0 – 21.0
Iron (Fe)
Balance
Molybdenum (Mo)
2.80 – 3.30
Niobium (Nb)
4.75 – 5.50
Titanium (Ti)
0.65 – 1.15
Aluminum (Al)
0.20 – 0.80
Cobalt (Co)
≤ 1.00
Carbon (C)
≤ 0.08
Manganese (Mn)
≤ 0.35
Silicon (Si)
≤ 0.35
Phosphorus (P)
≤ 0.015
Sulfur (S)
≤ 0.015
Boron (B)
≤ 0.006
Copper (Cu)
≤ 0.30
Chemical composition conforms to ASTM B637 and AMS 5662/5663 specifications. Mill test reports with actual values are provided with every shipment.
Mechanical Properties
Inconel 718 delivers high strength across a broad temperature range. Its mechanical properties can be tailored through heat treatment – typically solution annealing followed by precipitation hardening (aging). The following values represent typical properties:
Custom heat treatment specifications available upon request
Properties may vary based on heat treatment condition and product form.
Physical Properties
Property
Value
Density
8.19 – 8.24 g/cm³ (0.296 lb/in³)
Melting Range
1,260 – 1,320°C (2,300 – 2,410°F)
Modulus of Elasticity
~200 GPa (29,000 ksi)
Thermal Conductivity (20°C)
~11.4 W/m·K
Specific Heat Capacity
~435 J/kg·K
Electrical Resistivity
~1.25 µΩ·m
Coefficient of Thermal Expansion (20-100°C)
~13.0 µm/m·K
Maximum Service Temperature
650 – 700°C (1,200 – 1,300°F)
Technical Specifications & Standards
ZYTC Alloy supplies Inconel 718 in accordance with the following international standards. We can also provide materials meeting equivalent standards upon request.
Standard
Specification
ASTM B637
Bars, Forgings, and Forging Stock for Nickel Alloy
ASTM B670
Plate, Sheet, and Strip
ASTM B906
General Requirements for Nickel Alloy Plate, Sheet, and Strip
