Alloy 825, UNSN08825, 2.4858

Alloy 825

 

Alloy 825 (UNS N08825)

Summary

A nickel-iron-chromium alloy with additions of molybdenum and copper. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. The alloy is especially resisitant to sulfuric and phosphoric acids. Used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.

Standard Product Forms

Pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire.

Chemical Composition Wt,%

 

Min

Max.

 

Min.

Max.

 

Min.

Max.

Ni

38.0

46.0

Cu

1.5

3.0

C

 

0.05

Cr

19.5

23.5

Co

 

 

Si

 

0.5

Fe

22.0

 

Al

 

0.2

P

 

 

Mo

2.5

3.5

Ti

0.6

1.2

S

 

0.03

Nb

 

 

Mn

 

1.0

N

 

 

Physical

Constants

Density,g/ 8.14

Melting Range,℃ 1370-1400

Typical Mechanical Properties

(Annealed)

Tensile Strength, ksi 100

Mpa 690

Yield Strength (0.2% Offset),ksi 45

Mpa 310

Elongation, % 45

 


Microstructure

Incoloy 825 has a stable face-centered-cubic structure.


Characters

Good resistance to stress-corrosion cracking;

Satisfactory resistance to pitting and crevice corrosion;

Good resistance to oxidizing and non-oxidizing hot acids;

Good mechanical properties at both room and elevated temperature, up to approximately 550℃;

Approval for pressure vessels with wall temperatures up to 450℃.


Corrosion Resistance

Alloy 825 is a versatile general engineering alloy with resistance to corrosion in acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions. The versatility of Alloy 825 is illustrated by its use nuclear fuel element dissolvers where o variety of corrosive media, e.g. Sulphuric and nitric acids and sodium hydroxide, are handled in the same equipment.


Applications

Alloy 825 is used in a wide variety of applications up to a temperature of approximately 550℃. The typical applications are:

1. Components such as heating coils, tanks, crates, baskets and chains in sulphuric acid picking plants;

2. Sea-water-cooled heat exchangers, offshore product piping systems; tubes and components in sour gas service ;

3. Heat exchangers, evaporators, scrubbers, dip pipes etc. In phosphoric acid production;

4. Air-cooled heat exchangers in petroleum refineries;

5. Food processing;

6. Chemical plant;

7. Combustion-resistant alloy for high pressure O2 applications.


We have products:

seamless pipe,seamless tube,

 

 

 

 

 

welded pipe,welded tube,

pipe fitting,flange,bar,plate


Complete inspection equipment and quality system.
Eddy current test, Ultrasonic detector, hydraulic test equipment, Universal testing machine, Arldirect-reading spectrometer...... Recently we have replaced a new set of advanced PMI equipment, OXFORD INSTRUMENTS X-MET7000
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Advanced equipment and technological process.
We have 5 bright annealed furnace with 30 mtrs in length, the highest temperature can reach 1350℃, and the tolerance between the set and real temperature could be within 2℃, and it ensures the mechanical properities and the quality of the pipe surface.
Straightening Machine, this equipment can ensure the straightness of our big OD pipes
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