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INCONEL® Alloy 625,UNS Number N06625,Alloy 625

According to thickness

INCONEL^® Alloy 625

UNS Number N06625

Other common names: Alloy 625

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.

In what form is Inconel 625 available at Mega Mex?

Sheet
Plate
Bar
Pipe & Tube (welded & seamless)
Wire

What are the characteristics of Inconel 625?

High creep-rupture strength
Oxidation resistant to 1800° F
Seawater pitting and crevice corrosion resistant
Immune to chloride ion stress corrosion cracking
Non-magnetic

Chemical Composition, %

Cr	Ni	Mo	Co + Nb	Ta	Al	Ti	C
20.00-30.00	Remainder	8.0-10.0	1.0 max	3.15-4.15	.40 max	.40 max	.10 max

Fe	Mn	Si	P	S
5.0 max	.50 max	.50 max	.015 max	.015 max

In what applications is Inconel 625 used?

Aircraft ducting systems
Aerospace
Jet engine exhaust systems
Engine thrust-reverser systems
Specialized seawater equipment
Chemical process equipment

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.

For more information on fabrication and machining, click here.

ASTM Specifications

Pipe Smls	Pipe Welded	Tube Smls	Tube Welded	Sheet/Plate	Bar	Forging	Fitting	Wire
B444	B705	B444	B704	B443	B446	-	-	-

Mechanical Properties
Representative Tensile Properties, bar, 1800° F anneal

Temp° F	Tensile (psi)	.2% Yield (psi)	Elongation in 2 “ (%)
70	144,000	84,000	44
400	134,000	66,000	45
600	132,000	63,000	42.5
800	131,500	61,000	45
1000	130,000	60,500	48
1200	119,000	60,000	34
1400	78,000	58,500	59
1600	40,000	39,000	117