Inconel718 is a precipitation hardenable nickel-based alloy designed to display exceptionally high yield, tensile and creep-rupture properties at temperatures up to 1400°F. The sluggish age-hardening response of inconel 718 permits annealing and welding without spontaneous hardening during heating and cooling. This alloy has excellent weldability when compared to the nickel-base superalloys hardened by aluminum and titanium.
Inconel 718 Available Formats
XOT Metals offers nickel alloy Inconel 718 in a variety of forms, including:
- Bar
- Wire
- Sheet
- Plate
- Forgings
- Pipe fittings
- Flanges
- Seamless & Welded pipe
- Seamless Tube & Welded tube
- Weld Rod
Nickel alloy Inconel 718 is usually provided in the solution annealed condition (AMS 5662 & AMS 5596), but can be also be supplied in the aged hardened or precipitation heat treated condition (AMS 5663 & AMS 5597) prior to forming.
Inconel 718 strip is available from .001″ to .063″ in 12″ wide coils. 24″ wide strip is available in some gauges. Minimum production quantities may apply.
Inconel718 sheet is available from .012 – .156″ thickness in 36″ & 48″ wide sheets.
Inconel718 plate is available from .1875″ thick to 4″
Inconel 718 tube is available in seamless and welded construction. Standard tube sizes are available, but we also can have small diameter tubes fabricated or re-drawn with close tolerances in small production runs.
While nickel alloy Inconel 718 pipe is generally not available from stock in many cases we can have pipe sizes fabricated, machined or drawn to order.
Properties
Inconel718 is a nickel-based super alloy that is well suited for applications requiring high strength in temperature ranges from cryogenic up to 1400°F. Inconel 718 also exhibits excellent tensile and impact strength.
Chemical Composition
Element Percentage Carbon 0.08 max Manganese 0.35 max Phosphorus 0.015 max Sulfur 0.015 max Silicon 0.35 max Chromium 17-21 Nickel 50-55 Molybdenum 2.80-3.30 Columbium 4.75-5.50 Titanium 0.65-1.15 Aluminum 0.20-0.80 Cobalt 1.00 max Boron 0.006 max Copper 0.30 max Tantalum 0.05 max Iron Balance
Resistance to Corrosion and Oxidation of Inconel 718
Inconel 718 has good resistance to oxidation and corrosion at temperatures in the alloy’s useful strength range in atmospheres encountered in jet engines and gas turbine operations.
Workability
Hot Working
Hot-working is carried out using a 2050°F (1121°C) maximum furnace temperature. Hot-cold working in the range 1700/1850°F (927/1010°C) will improve the strength of the forging if the service temperature is below about 1100°F (593°C). Prolonged soaking at the forging temperature is not desirable. The material should be given uniform reductions to avoid the formation of duplex grain structures.
Machining
Inconel 718 can be readily machined in either the annealed or the age-hardened condition. The age-hardened condition gives better chip action on chip breaker tools and produces a better finish. The annealed condition will give a slightly longer tool life.
Welding
Inconel 718 can be welded in either the annealed or the age condition. Welding in the aged condition will cause the formation of a softened heat-affected zone.
Typical Mechanical Properties
Element Percentage Carbon 0.08 max Manganese 0.35 max Phosphorus 0.015 max Sulfur 0.015 max Silicon 0.35 max Chromium 17-21 Nickel 50-55 Molybdenum 2.80-3.30 Columbium 4.75-5.50 Titanium 0.65-1.15 Aluminum 0.20-0.80 Cobalt 1.00 max Boron 0.006 max Copper 0.30 max Tantalum 0.05 max Iron Balance
Standards
Inconel 718 is supplied to AMS 5596/5597 and has a UNS designation N07718.
Applications
Inconel718 is typically used for:
- Jet engine
- Gas turbine operations
For more information on this source,please contact us.