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Nickel & Nickel Alloys

N06625 • 2.4856
  • Application

Alloy 625 is a nickel-chromium alloy used for its high strength, excellent fabricability and outstanding corrosion resistance. Service temperatures can range from cryogenic to 980°C(1800°F).

Alloy 625 strength is derived from the solid solution strengthening effect of molybdenium and niobium on its nickel-chromium matrix. Thus precipitation hardening treatments are not required. This combination of elements also is responsible for superior resistance to a wide range of corrosive environments of unusual severity as well as to hightemperature effects such as oxidation and carburization.

  • Typical manufacturing specifications

ASTM B444
Also individual customer specifications.

  • Industries predominantly using this grade

Oil and gas, Chemical processes, Nuclear and power etc.

1-7

Technical Data

Chemical composition(% by Weight)

Element

C

Mn

Si

P

S

Cr

Nb+Ta

Mo

Fe

AI

Ti

Ni

Minimum

-

-

-

-

-

20.0

3.15

8.0

-

-

-

58.0

Maximum

0.10

0.50

0.50

0.015

0.015

23.0

4.15

10.0

5.0

0.40

0.40

-

Aiming

0.03

0.1

0.1

0.005

0.001

22

3.66

8.8

3.5

0.25

0.25

60

Mechanical Properties

Tubing, Annealed (at 871 C) Tubing, Annealed (at 1093 C)
Tensile Rm
120
ksi (min.)
100
ksi (min.)
Tensile Rm
827
MPa (min.)
690
MPa(min.)
Yield (R.p. 0.2%)
60
ksi (min.)
40
ksi (min.)
Yield (R.p. 0.2%)
414
MPa (min.)
276
MPa (min.)
Elongation
30
% (min.)
30
% (min.)