UNS N07718 (Inconel 718)

Short Introduction:

Inconel 718 / GB GH4169 / UNS N07718 / SEW VDIUV W.Nr.2.4668 NiCr19Fe19Nb5Mo3 /BS NA 51 / AFNOR NC19FeNb with extremely resistance to stress corrosion cracking and pitting ability in high temperature or low temperature environments, especially the inoxidability in the high temperature.

    Category:

    Description

    Alloy 718/Inconel 718 /UNS N07718

    Inconel 718 Material grades and equivalents:

    Inconel 718 /Alloy 718 / GB GH4169 / UNS N07718 / SEW VDIUV W.Nr.2.4668 / NiCr19Fe19Nb5Mo3 / BS NA 51/ AFNOR NC19FeNb

    Alloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel chromium material used at -423° to 1300°F. The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding. The ease and economy with which INCONEL alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications. Examples of these are components for liquid fueled rockets, rings, casings and various formed sheet metal parts for aircraft and land-based gas turbine engines, and cryogenic tankage. It is also used for fasteners and instrumentation parts.

    Inconel 718 Chemical composition:

     %

     Ni

     Cr

     Fe

     Mo

     Nb

     Co

     C

     Mn

     Si

     S

     Cu

     Al

     Ti

     Min.

     50

     17

       balance

     2.8

     4.75

     0.2

     0.7

    Max.

     55

     21

     3.3

     5.5

     1

     0.08

     0.35

     0.35

    0.01

     0.3

     0.8

     1.15

     

    Inconel 718 Physical properties:

    Density

    8.2 g/cm³

    Melting point

    1260-1340 ℃

     

    Inconel 718 Alloy minimum mechanical properties in the roomtemperature:

     Alloy

    Tensile strength Rm N/mm²

    Yield strength R P0. 2N/mm²

    Elongation A 5 %

    Brinell hardness HB

    Solutiontreatment

     965

     550

     30

     ≤363

     

    Inconel 718 Characteristic as below:

    1.workability

    2.High tensile strength,endurance strength,creep strength and rupture strength at 700℃.

    3.High inoxidability at1000℃.

    4.Steady mechanical performance in the low temperature.

    5.Good welding performance.

    Inconel  718 Metallurgical structure:

    Inconel 718 is Austenitic structure, precipitation hardening generate “γ” made it excellent mechanical performance. G rain boundary generate “δ” made it the best plasticity in the heat treatment.

    Inconel  718 Corrosion resistance:

    Inconel 718 with extremely resistance to stress corrosion cracking and pitting ability in high temperature or low temperature environments, especially the inoxidability in the high temperature.

    Inconel 718 Application field:

    1. The elevated temperature strength, excellent corrosion resistance and workability at 700℃ properties made it use in a wide range of high requirement environments.

    2. 1.Steam turbine 2.Liquid-fuel rocket

    3. 3.Cryogenic engineering 4.Acid environment 5.Nuclear engineering

    Specifications:

     

    Sheet/Plate

    AMS 5599/AMS 5879/ASME SB-443 Gr.

    1/ASTM B670

    Wire

    ASTM B670

    Bar/Forging

    AMS 5666/ASME SB-446 Gr. 1/ASTM

    B-446 Gr. 1