ASTM B444 UNS N06625 Nickel Alloy Pipes Seamless Alloy 400 Tubing
Inconel 625 is a corrosion and oxidation resistant nickel alloy
that is used both for its high strength and outstanding aqueous
corrosion resistance. Its outstanding strength and toughness is due
to the addition of niobium which acts with the molybdenum to
stiffen the alloy’s matrix. Alloy 625 has excellent fatigue
strength and stress-corrosion cracking resistance to chloride ions.
This nickel alloy has excellent weldability and is frequently used
to weld AL-6XN. This alloy resists a wide range of severely
corrosive environments and is especially resistant to pitting and
crevice corrosion. Some typical applications Inconel 625 is used in
are chemical processing, aerospace and marine engineering,
pollution-control equipment, and nuclear reactors.
Excellent mechanical properties at both extremely low and extremely
Outstanding resistance to pitting, crevice corrosion and
Almost complete freedom from chloride induced stress corrosion
High resistance to oxidation at elevated temperatures up to 1050C.
Good resistance to acids, such as nitric, phosphoric, sulfuric and
hydrochloric, as well as to alkalis makes possible the construction
of thin structural parts of high heat transfer.
Fabrication with Inconel 625:
Alloy 625 has excellent forming and welding characteristics. It may
be forged or hot worked providing temperature is maintained in the
range of about 1800-2150° F. Ideally, to control grain size, finish
hot working operations should be performed at the lower end of the
temperature range. Because of its good ductility, alloy 625 is also
readily formed by cold working. However, the alloy does work-harden
rapidly so intermediate annealing treatments may be needed for
complex component forming operations. In order to restore the best
balance of properties, all hot or cold worked parts should be
annealed and rapidly cooled. This nickel alloy can be welded by
both manual and automatic welding methods, including gas tungsten
arc, gas metal arc, electron beam and resistance welding. It
exhibits good restraint welding characteristics.
Components where exposure to sea water and high mechanical stresses
Oil and gas production where hydrogen sulfide and elementary sulfur
exist at temperature in excess of 150C.
Components exposed to flue gas or in flue gas desulfurization
Flare stacks on offshore oil platforms.
Hydrocarbon processing from tar-sand and oil-shale recovery
|Pipe Smls||Pipe Welded||Tube Smls||Tube Welded||Sheet/Plate||Bar||Forging||Fitting||Wire|
Representative Tensile Properties, bar, 1800° F anneal
|Temp° F||Tensile (psi)||.2% Yield (psi)||Elongation in 2 “ (%)|