Alloy 825 Pipe/Tube, Flanges, Fittings

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:

ASTM B163 / B423 ASME SB163 / SB423 Alloy 825 Nickel Alloy Seamless Tube; ASTM A269 Welded Capillary Tube SS TP316L Downhle Tube For Oilfield Services; ASTM B407 / B829 Inc 800 / 800H / 800HT Nickel Alloy Seamless Pipe; DDV Control Line Alloy 825 Stainless Steel Welded Coiled Tubing For Chemical Injection Line; ASTM B704 UNS N08825 Oilfield Welded Inhibitor Supply Line With PVDF Encapsulation; ASTM B677 / B829 Alloy 926 / UNS N08926 Nickel Alloy Seamless Pipe; ASTM B704 Alloy 825 Multi-Core Encapsulated Control Line 1500psi; ASTM A269 / ASME SA269 1 / 4 Inch Stainless Steel Welded Super Long Coiled Tube; ASTM A564 Alloy 800 / UNS N08800 Nickel Alloy Slip On Flange; ASTM A366 Alloy 825 / 926 UNS N08825 / N08926 Nickel Alloy Blind Flange; Alloy 825 / 718 Nickel Alloy Steel Sheet For Gas And Oil Industry; Alloy C276/601/625/825 Nickel Alloy Sheet/Bar/Strip With High Quality; ASME SB163 / SB423 Nickel Alloy Seamless Alloy 825 Pipe; Nickel Capillary Tube Alloy 825/625 Downhle Welded Coiled Tube For Oilfield Services; Stainless Steel Welding Heat Exchange Tube ASTM A213 For Air Condenser; TP316 Stainless Steel Straight Heat Exchange Tube, ASTM A213 For Chemical Equipment; ASTM A213/269 Heat Exchange Stainless Steel Tubing With A&P Surface For Pressure Vessel; TP321/321H 19.05mm Stainless Steel Tubing Cold Rolled For Boiler; Duplex Steel S31803 31.8mm Seamless/ Welded U Bend Tubing For Desalination; S31803 Duplex Steel Heat Exchanger Tube With Annealed&Pickling Surface; S31803/2205 ASTM A789 Heat Exchanger Seamless /Welded Tube For Petroleum Refining; Petroleum Refining Used S31803/32750 Heat Exchanger Tube; 25.4mm Cold Rolled U Bend Tube Duplex Steel For Heat Exchanger; 25.4mm Cold Rolled S31803 Tube Desalination Used Duplex Steel For Heat Exchanger; Instrumentation Used Nickel Alloy 825/625 Heat Exchange U Tube; Cold Rolled Nickel Alloy Heat Exchange Seamless U Tube With Annealed; Heat Exchange Tube Nickel Alloy 625/825 For Chemical Equipment with BA/AP Surface; Nickel Alloy Cold Rolled Heat Exchange Tube Alloy 625/UNS N06625 For Pressure Vessel; 19.05mm Cold Rolled U Bend Tube Nickel Alloy Seamless For Heat Exchanger; Chemical Equipment Used 31.8mm Cold Rolled Nickel Alloy Straight/ U Bend Tube Corrosion Resistance; Alloy 400/600 Nickel Alloy Heat Exchanger U Bend Tube With Annealed Surface;
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