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.

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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

Fe

Mn

Si

P

S

20.00-30.00

Remainder

8.0-10.0

1.0 max

3.15-4.15

.40 max

.40 max

.10 max

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