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Industry knowledge about Inconel 718
Jan 22, 2019

Inconel 718 could be a nickel-chromium-molybdenum alloy designed to resist a good vary of severely corrosive environments, indentation and crevice corrosion. This alloy steel alloy conjointly displays exceptionally high yield, tensile, and creep-rupture properties at high temperatures. This alloy is employed from refrigerant temperatures up to long run service at 1200° F. one amongst the characteristic options of alloy 718’s composition is that the addition of atomic number 41 to allow age hardening that permits hardening and fastening while not spontaneous hardening throughout heating and cooling. The addition of atomic number 41 acts with the Mo to stiffen the alloy’s matrix and supply high strength while not a strengthening heat treatment. different in style nickel-chromium alloys are age hardened through the addition of atomic number 13 and metallic element. This alloy steel alloy is quickly invented and should be welded in either the treated or precipitation (age) hardened condition. This superalloy is employed during a type of industries like part, chemical process, marine engineering, pollution-control instrumentation, and nuclear reactors.


In what forms is metal 718 on the market at Mega Mex?


Sheet

Plate

Bar

Wire

What are the characteristics of metal 718?


Good mechanical properties – tensile, fatigue and creep-rupture

Yield lastingness, creep, and rupture strength properties are extremely high

Highly proof against chloride and sulphide stress corrosion cracking

Resistant to liquid corrosion and chloride particle stress corrosion cracking

High temperature resistant

Age-hardenable with a singular property of slow aging response that allows heating and cooling throughout hardening while not the danger of cracking.

Excellent fastening characteristics, proof against postweld age cracking


Chemical Composition, %

NiFeCrCuMoNbCMn
50.00-55.00Remainder17.00-21.00.30 max2.80-3.304.75-5.50.08 max.35 max
PSSiTiAlCoB 
.015 max.015 max.35 max.65-1.15.20-.801.00 max.006 max


In what applications is alloy 718 used?


Chemical process

Aerospace

Liquid fuel rocket motor elements

Pollution-control instrumentation

Nuclear reactors

Cryogenic storage tanks

Valves  fasteners, springs, mandrels, conduit hangers

Well head completion instrumentation and blow out preventers (BOP’s)

Gas turbine engine components


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