Inconel 625 Chemical composition
Alloy
|
%
|
Ni
|
Cr
|
Mo
|
Nb+N
|
Fe
|
Al
|
Ti
|
C
|
Mn
|
Si
|
Cu
|
P
|
S
|
625
|
Min.
|
58
|
20
|
8
|
3.15
|
|
|
|
|
|
|
|
|
|
Max.
|
|
23
|
10
|
4.15
|
5
|
0.4
|
0.4
|
0.1
|
0.5
|
0.5
|
0.5
|
0.015
|
0.015
|
Inconel 625
Pysical properties
Density
|
8.4 g/cm³
|
Melting point
|
1290-1350℃
|
Inconel 625 Alloy m inimum
mechanical properties in the room temperature
Alloy state
|
Tensile strength Rm N/mm²
|
Yield strength R P0. 2N/mm²
|
Elongation
A 5 %
|
Brinell hardness HB
|
625
|
760
|
345
|
30
|
≤220
|
Characteristic as below:
1. Excellent corrosion resistance of different kinds of media in both
oxidation and reduction environments.
2. Excellent resistance of pitting and crevice corrosion,
and won't happen stress corrosion cracking because of chloride.
3.Excellent resistance of the inorganic acid corrosion
performance, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric
acid and the mixture of sulfuric acid and hydrochloric acid.
4. Excellent corrosion resistance of different kinds of
inorganic acid mixture performance.
5. Good corrosion resistance of a variety of
concentrations of hydrochloric acid when the temperature up to 40℃ .
6. Good machining and welding, no weld cracking
sensitivity.
7. Have pressure vessel authentication for the wall
temperature between -196 ~ 450℃ .
8. Apply for the highest standard lever VII of acidic
environment by the NACE ( MR-01-75) authorized.
Inconel 625 Metallurgical structure625 is face-centered
cubic lattice structure.
Dissolve out the carbon granule and
instability quaternary phase, then change it to stability Ni3 (Nb,Ti) trimetric
lattice around 650℃ after a long time heat preservation. nickel-chromium content
will strength the mechanical performance in the state solution while suppress
the plasticity.
Inconel 625 Corrosion resistance
625 own a very good corrosion resistance in many media, especially with
excellent resistance to pitting, crevice corrosion, intercrystalline corrosion,
and erode in oxide, also good resistance to inorganic acid corrosion, such as
nitric acid, phosphoric acid, sulfuric acid and hydrochloric acid. 625 can
resist the alkali and organic acid corrosion in the oxidation and reduction
environment. Effect resists the chloride reduction stress corrosion cracking.
Normally no corrosion in the sea-water and industry environments since high
corrosion resistance to the sea-water and salting liquid,as well as in high
temperature, without sensitivity during welding. 625 have the resistance to
oxidation and carbonizing in the static and cycle environments, also hacve the
resistance the chlorine corrosion.
Inconel 625 Application field :
Soften annealing low
carbon alloy 625 widely used in the chemical process industry, good corrosion
resistance and high strength made it an good choice for structural parts. 625
have application in sea-water for local mechanical stress attach.
Inconel 625 Typical application field as below:
1 .The Organic chemical process parts contains chloride, especially in the
use of acid chloride catalyst.
2. The digester and bleacherin the use of paper pulp and paper making
industry.
3.Absorption tower, re-heater,gas import board, fan, blender, fair water
fin, flue and so on for using in flue gas desulfurization system.
4. The equipment and parts in the use of acidic gas environments.
5. Acetic acid and anhydride reaction generator
6. Sulfur acid
cooling