INCONEL® 718

The addition of niobium acts with the molybdenum to stiffen the alloy’s  matrix and provide high strength without a strengthening heat treatment. Other  popular nickel-chromium alloys are age hardened through the addition of aluminum  and titanium.

This nickel steel alloy is readily fabricated and may be welded in either the  annealed or precipitation (age) hardened condition. This superalloy is used in a  variety of industries such as aerospace, chemical processing, marine  engineering, pollution-control equipment, and nuclear reactors.

What are the characteristics of Inconel 718?

· Good mechanical properties – tensile, fatigue and creep-rupture

· Yield tensile strength, creep, and rupture strength properties are  exceedingly high

· Highly resistant to chloride and sulfide stress corrosion cracking

· Resistant to aqueous corrosion and chloride ion stress corrosion  cracking

· High temperature resistant

· Age-hardenable with a unique property of slow aging response that permits  heating and cooling during annealing without the danger of cracking.

· Excellent welding characteristics, resistant to postweld age cracking

Chemical Composition, %

In what applications is Inconel 718 used?

· Chemical processing

· Aerospace

· Liquid fuel rocket motor components

· Pollution-control equipment

· Nuclear reactors

· Cryogenic storage tanks

· Valves, fasteners, springs, mandrels, tubing hangers

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

· Gas turbine engine parts

ASTM Specifications

Mechanical Properties

Typical room temperature properties, 1800°F annealed condition