| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
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Audited Supplier Incoloy 825 is a titanium-stabilized fully austenitic nickel-iron-chromium alloy with additions of copper and molybdenum. Incoloy 825 is a general purpose engineering alloy that is resistant to acid and alkali metal corrosion in both oxidizing and reducing environments.
Foreign name: Incoloy825
Field of application: Air heat exchangers in petroleum refining
Alloy Properties: Good Stress Corrosion Cracking Resistance
Chemical composition: Nickel Ni: 38-46
Alloy Overview
The high nickel content makes the alloy effective against stress corrosion cracking. It has good corrosion resistance in various media, such as sulfuric acid, phosphoric acid, nitric acid and organic acids, and alkali metals such as sodium hydroxide, potassium hydroxide and hydrochloric acid solutions. The higher comprehensive performance of Incoloy 825 is manifested in nuclear combustion dissolvers with various corrosive media, such as sulfuric acid, nitric acid and sodium hydroxide, which are all processed in the same equipment.
Similar grades
NS142 (China), NC21FeDu (France), W.N r.2.4858 NiCr21Mo (Germany) NA16 (UK) Incoloy825, UNS NO8825 (US) NiFe30Cr21Mo3 (ISO)
Chemical composition
Nickel Ni: 38-46
Chromium Cr: 19.5-23.5
Iron Fe: balance
Carbon C: ≤0.025
Manganese Mn: ≤1.0
Silicon Si: ≤0.5
Molybdenum Mo: 2.5-3.5
Copper Cu: 1.5-3.0
Cobalt Co: ≤1.0
Aluminum Al: ≤0.2
Titanium Ti: 0.6-1.2
Alloy properties
Good resistance to stress corrosion cracking
Good resistance to pitting and crevice corrosion
Good anti-oxidative and non-oxidative thermal acid properties
Good mechanical properties at room temperature and high temperature up to 550ºC
Approved for pressure vessels with manufacturing temperature up to 450ºC
Application areas of alloys
Incoloy 825 is widely used in various industrial fields where the operating temperature does not exceed 550 ºC.
Typical applications are:
Heating pipes, containers, baskets and chains used in sulfuric acid pickling plants.
Seawater cooling heat exchanger, marine product piping system, acid gas environment piping.
Heat exchangers, evaporators, scrubbers, dip tubes, etc. in phosphoric acid production.
Air heat exchanger in petroleum refining
Food engineering
Chemical process
Flame retardant alloys for high pressure oxygen applications
welding
Incoloy 825 is suitable for welding with the same material or other metals by any conventional welding process, such as tungsten electrode inert gas welding, plasma arc welding, manual argon arc welding, metal inert gas welding, MIG welding, where pulsed Arc welding is the preferred solution. When using manual argon arc welding, it is recommended to use a shielding gas mixed with various components (Ar+He+H2+CO2).
Welding of Incoloy 825 must be carried out in the annealed condition and cleaned with a stainless steel wire brush to remove stains, dust and various markings. When welding the root of the weld, extreme care must be taken (Argon 99.99) to obtain the best quality of the root weld so that the weld does not produce oxides after the root has been welded. Color from the weld heat-affected zone should be removed with a stainless steel brush while the weld area is not cool.
Welding materials
For the gas shielded welding process, the following filler metals are recommended
Metal electrode:
Nicrofer S 6020-FM625
Material No. 2.4831
SG-NiCr21Mo9Nb
AWS A5.14: ERNiCrMo-3
Coated electrode
Material No. 2.4621
EL-NiCr20Mo9Nb
AWS A5.11: ENiCrMo-3
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