INCONEL 925

Inconel 925 is a nickel-chromium-molybdenum alloy designed to resist a wide range of severely corrosive environments, pitting and crevice corrosion. This nickel steel alloy also displays exceptionally high yield, tensile, and creep-rupture properties at high temperatures. This nickel alloy is used from cryogenic temperatures up to long term service at 1200° F. One of the distinguishing features of Inconel 925 composition is the addition of niobium to permit age hardening which allows annealing and welding without spontaneous hardening during heating and cooling. 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.

Characteristics of Inconel 925

• 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, %

Applications

• 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

• Incoloy® Alloy 925 (UNS N09925) is an agehardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum. 

• The nickel content is sufficient for protection against chloride-ion stress corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing chemicals. The molybdenum aids resistance to pitting and crevice corrosion. The alloy’s chromium content provides resistance to oxidizing environments. The titanium and aluminum additions cause a strengthening reaction during heat treatment.

Available Product Forms: 
Tube, round bar, flat bar, forging stock and wire

Specifications

INCOLOY® alloy 925 is designated as UNS N09925.

Designations and specifications for the product include NACE MR-01-75, ASME Boiler and Pressure Vessel Code Case 2218 Section VIII Division 1.

Inconel 925 is a nickel-chromium-molybdenum alloy designed to resist a wide range of severely corrosive environments, pitting and crevice corrosion. This nickel steel alloy also displays exceptionally high yield, tensile, and creep-rupture properties at high temperatures. This nickel alloy is used from cryogenic temperatures up to long term service at 1200° F. One of the distinguishing features of Inconel 925 composition is the addition of niobium to permit age hardening which allows annealing and welding without spontaneous hardening during heating and cooling. 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.

characteristics of Inconel 925

• 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, %

Applications

• 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
 

Sheet/Plate--