Incoloy 825 2.4858
UNS N08825 is a nickel-iron-chromium alloy with additions of molybdenum and copper
. This nickel steel alloy’s chemical composition is designed to provide exceptional resistance to many corrosive environments. It is similar to alloy 800 but has improved resistance to aqueous corrosion
. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulfuric acids
and phosphoric acids
. This nickel steel alloy is used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.
Incoloy 825 Characteristic as below:
1. Good stress corrosion cracking
2. Good resistance for pitting and crevice corrosion performance
3. Good anti-oxidation and non-oxidzing heat acid performance
4. Good mechanical
performance in both room temperature and up to 550℃
5. Have the pressure
vessel authenticate when manufacture temperature
up to 450℃
Incoloy 825 is approved for pressure
vessel operating temperatures up to 525°C (AS1210, AS4041), 538°C (ASME Boiler & Pressure Vessel Code, Sections I, III, VIII, IX, Cases 1936, N-188). Brittle phases may form in alloy 825 at temperatures above ~ 540°C, so it is not normally used at these temperatures, where creep-rupture properties would be design factors.
Incoloy 825 Metallurgical structure: 825 is the face-centered cubic lattice structure.
Incoloy 825 Corrosion resistance
825 is an all-purpose project alloy, have good corrosion resistance of the acid and alkali metal property in both oxidation and reduction environments. High nickel
content made it with effective stress corrosion cracking resistance performance. 825 have excellent corrosion resistance in different kinds of media, such as sulfuric acid
, phosphoric acid
, nitric acid
and organic acid, alkali metal such as sodium hydroxide, potassium hydroxide, and hydrochloric acid
. A variety of media corrosion of nuclear-burning dissolver show 825 high integrated prpperty, like sulfuric acid
, nitric acid and potassium hydroxide are all dealing in a same device.
Incoloy Alloy 825 Specification:
ASM specifications for Incoloy Alloy 825.
||Seamless Nickel and Nickel Alloy Condenser and Heat Exchanger Tube
||Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221)* Seamless Pipe and Tube
||Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Plate, Sheet, and Strip
||Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825)
||Welded UNS N06625 and UNS N08825 Alloy Tubes
||Nickel-Alloy (UNS N06625 and N08825) Welded Pipe
||General Requirements for Nickel and Nickel Alloy Welded Tube
ASME SB163 Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes
ASME SB165 Standard Specification for Nickel-Copper Alloy (UNS N04400)* Seamless Pipe and Tube
ASME SB167 Standard Specification for Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS N06617),and Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674) Seamless Pipe and Tube
ASME SB407 Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube
ASME SB423 Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825, N08221, and N06845) Seamless Pipe and Tube
ASME SB444 Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube
ASME SB622 Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube
ASME SB668 UNS N08028 Seamless Pipe and Tube
ASME SB690 Standard Specification for Iron-Nickel-Chromium-Molybdenum Alloys (UNS N08366 and UNS N08367) Seamless Pipe and Tube
ASME SB729 Standard Specification for seamless UNS N08020, UNS N08026, and UNS N08024 nickel alloy pipe and Tube
Incoloy 825 Application field: 825widely use in many kinds of industry field that the working temperature no more than 550℃.
Incoloy 825 Typical application field:
1. Sulfuric acid factory usage for heating pipe, container, basket,chain and so on.
2. Cooling heat exchanger, marine product pipeline system and gas pipeline of acidic environment.
3. Heat exchanger, steam machine, washing, impregnation pipe, etc. for phosphoric acid produce
4. Oil refining in the air heat exchanger
5. Food project
6. Chemical process
7. Application of high pressure oxygen flam-retardant alloy