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Alloy 718 Description

Alloy 718, often referred to as Inconel 718, is a high-strength, corrosion-resistant nickel chromium alloy supplied in the hot worked, solution annealed and age hardened condition. As with other types of Inconel, the Special Materials Corporation owns the trademark for Incoloy Alloy 718.

The addition of Nb, Ti, Al and Ni forms a series of precipitates during the controlled solution annealing and ageing process steps. This results in a significant increase in strength and hardness compared with alternative nickel alloys. These tensile and creep rupture properties are maintained from cryogenic to elevated temperatures. These properties make it suitable for applications between -250oC – 650oC.

As a nickel-chromium alloy, Inconel 718 possesses acceptable corrosion resistance in a range of environments including sea water, hydrogen sulphide, CO2, elemental sulphur and chloride ions over various temperatures. It is resistant to sulphide stress cracking and is capable of passing the sulphide stress corrosion test in accordance with NACE TM 0177 Method C solution A.

Furthermore, Alloy 718 also features exceptional welding properties – even in comparison to other Inconel alloys. As a result of these exceptional welding properties, Inconel Alloy 718 is suitable for a wide range of applications. We will go into further detail about these uses for Alloy 718 below.

Chemical Analysis

% C Cr Ni Mo Cu P Mn Fe S W Co Ti
min 17 50 2.8 0.7
max 21 55 3.3 0.30 0.015 0.35 Bal 0.01 1.0 1.15

Mechanical & Physical Properties

0.2% Yield Strength Tensile Strength Elongation Modulus of Elasticity Density Melting Range
MPa MPa % GPa g/cm³ °C
550 965 30 145 8.2
  • COMMON TRADE NAMES
  • Inconel 718
  • UNS N07718
  • NiCr19Nb5Mo3
  • GH4169
  • API 6CRA 718
  • NACE MR 01-75
  • ISO 115156-3
  • ЭП718 / ХН19ВМБТА
  • NCF 718

Specification

  • Plate:ASTM B670
  • Bar:ASTM B637
  • Pipe:ASTM B704
  • Forging:AMS 5663/5664

APPLICATION

  • Aerospace:
  • Jet engine components (e.g., turbine disks, blades, combustion chambers).
  • Rocket engine components.
  • Energy Industry:
  • Gas turbine components.
  • Nuclear reactor components.
  • Chemical Industry:
  • High-temperature, high-pressure reactors.
  • Piping and valves for corrosive media.
  • Other Fields:
  • High-strength bolts and fasteners.
  • Molds and tools.

Welding consumables

  • AWS A5.14 ERNiFeCr-2
  • SFA 5.14 ERNiFeCr-2
  • AWS A5.11 ENiCrMo-3
  • ISO ENi6625
  • INCONEL 112

What Can We Offering

Available Product Range (in mm)

  • Hot-Rolled Steel Plates
  • Thickness: Ranging from 3mm to 120mm
  • Width: 600mm-2500mmStandard Width: 1000, 1219, 1500, and 2000mm
  • Length:1000mm-25000mm
  • Cut to Length: 2000 2440, 3000, 3048 and 6000mm
  • Surface Types: Includes NO.1, NO.4, 8K, Brush, and Checkered
  • Cold-Rolled Steel Sheet/Plate
  • Thickness: Ranging from 0.2mm to 4mm
  • Width: 600mm-2000mm
  • Standard Width: 1000, 1219, 1500, and 2000mm
  • Length:1000mm-6000mm
  • Cut to Length: 2000 2440, 3000, 3048 and 6000mm
  • Form: Sheet Or Coil

Available Round Bar Dimensions (in mm)

  • Diameter
  • General Range: 3mm to 800mm
  • Common Range: 25mm to 152mm
  • Specialized: Up to 300mm or more for certain applications
  • Length
  • Standard: 1 to 6 meters
  • Custom: Available in custom cut lengths
  • Other dimensions
  • Forms: Available in various forms including round, square, hex, flat, billet, and ingot
  • Finishes: Common finishes include bright, polished, and black
  • Tolerance:±0.05 mm (cold-drawn), ±0.4 mm (hot-rolled)

Type Of Flangs (Size/Dimensions)

  • Welding Neck, Reducer Flange,Socket Weld Flange
  • Dimensions:½” – 48″（DN15-DN1200）
  • Pressure Class:150# 300# 600#900#1500#
  • Facing Type:RF,FF,RTJ
  • Slip-On Flange,Lap Joint Flange,Threaded Flange
  • Dimensions:½” NB – 24″ NB（DN15 – DN600）
  • Pressure Class: Class 150 to 2500
  • Face: Raised face (RF), Ring type joint (RTJ)
  • Blind Flange
  • Dimensions:½” – 60″（DN15-DN1500）
  • Pressure Class:150# 300# 600#900#1500#

Types of Steel Pipes & Tubes

  •  Seamless Pipe
  • OD Φ6 – Φ630 mm, WT 0.5 – 80 mm
  • Welded Pipe
  • OD Φ15 – Φ3000 mm (up to 3m for spiral)
  • Precision Tube
  • OD Φ4 – Φ100 mm, WT tolerance ±0.05mm
  • Capillary Tube
  • OD 0.5 – 6 mm, WT down to 0.1mm
  • Coiled Tube
  • Up to 100–1000m long, for OD < Φ25mm

Types of Fittings

  • Elbow:Butt-Weld┃Socket Weld ┃Threaded
  • 90°, 45°, and 180°. Available in Long Radius (LR) and Short Radius (SR) types.
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
  • Custom angles (e.g., 30°, 60°), U-bend heat exchanger tubes
  • Tee:Equal┃Reducing┃Butt-Weld┃Socket Weld┃Threaded
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS<
  • Cap:Butt-Weld┃Threaded┃Socket Weld
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
  • Custom non-standard sizes, small batch orders
  • Weldolet,Sockolet,Threadolet,Latrolet,Nipolet,Lapolet
  • Run Pipe: DN25 – DN1200 (NPS 1″ – 48″)
  • Outlet Branch: DN6 – DN200 (NPS ¼” – 8″)
  • Schedule: SCH 40, 80, 160, XXS (matched to run pipe)

Overall Supply Range of Metal Strip & Foil

Strip & Foil
  • Thickness(Thin Strip):0.02 mm – 0.5 mm
  • Thickness(Foil):≤ 0.02 mm（20 μm）
  • Narrow width: 5–50 mm (for electronic leads)
  • Wide width: 50–600 mm (for general coil applications)
  • Coil Length:Continuous rolls, each roll 10–3000 meters
  • Roll weight: 1–500 kg (depending on material density)
  • Finishes:Bright,Matte,Embossed,Coated