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Incoloy 825 has high corrosion resistance. It has a high nickel content sufficient to resist chloride stress corrosion cracking and a very stable austenitic structure. The content of molybdenum and copper makes the alloy resistant to reducing agents and acids. Chromium is resistant to oxidizing conditions such as nitric acid solutions, nitrates and oxidizing salts. The alloy is stabilized with titanium to protect against post-fabrication pitting and intergranular corrosion, especially during welding, including heating in the critical sensitization temperature range (650°C – 760°C).
Alloy 825 has excellent resistance to sulfuric and phosphoric acid corrosion and is generally the most economical grade for sulfuric acid service.
Austral Wright Metals can process this alloy into sheets, sheets, strip, bars, bars, wire, pipes, tubes, fittings, fasteners.
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). 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). Incoloy 825 is approved for pressure vessel operating temperatures up to 525°C (AS1210, AS4041), 538°C (ASME Boiler and Pressure Vessel Code Sections I, III, VIII, IX Case 1936, N-188). Incoloy 825 is approved for pressure vessel operating temperatures up to 525°C (AS1210, AS4041), 538°C (ASME Boiler and Pressure Vessel Code Sections I, III, VIII, IX Case 1936, N-188). At temperatures above ~540°C, a brittle phase can form in alloy 825, so it is generally not used at temperatures where creep strength is a design factor.
Table 2. Typical tensile properties at room temperature (not used for calculation. Refer to the specifications of the respective material or product for design values)
The outstanding characteristic of Incoloy 825 is its corrosion resistance. In reducing & oxidising conditions, Incoloy 825 resists general corrosion, pitting & crevice corrosion, intergranular corrosion and stress corrosion cracking. In reducing & oxidizing conditions, Incoloy 825 resists general corrosion, pitting & crevice corrosion, intergranular corrosion and stress corrosion cracking. Under reducing and oxidizing conditions, Incoloy 825 is resistant to general corrosion, pitting, crevice corrosion, intergranular corrosion and stress corrosion cracking. Under reducing and oxidizing conditions, Incoloy 825 is resistant to general corrosion, pitting, crevice corrosion, intergranular corrosion and stress corrosion cracking. It is particularly useful in sulphuric & phosphoric acids, sulphur containing flue gases, sour gas and oil wells and sea water. It is particularly useful in sulphuric & phosphoric acids, sulphur containing flue gases, sour gas and oil wells and sea water. It is particularly useful in sulfuric and phosphoric acids, sulphurous flue gases, sour gases and oil wells, as well as sea water. It is particularly suitable for use in sulfuric and phosphoric acid, sour flue gases, sour gases and oil wells, as well as sea water.
Incoloy 825 is easily hot or cold worked. Hot working should be carried out at 870 – 980°C in the range 870 – 1180°C. For maximum corrosion resistance, hot worked parts must be annealed stabilized before use. This alloy is easier to cold work than stainless steel.
The alloy is easily welded by conventional methods (GMAW (MIG), GTAW (TIG), SMAW (manual), SAW). Joints must be clean to avoid contamination of the weld pool.
Incoloy 825 fires consistently at 940°C. The softest structure was obtained at 980°C. Sections heavier than sheet, strip and wire must be hardened to avoid sensitivity.
This information has been verified and adapted from materials provided by Austral Wright Metals – Black, Non-Ferrous and High Performance Alloys.
For more information on this source, visit the Austral Wright Metals – Black, Non-Ferrous and Performance Alloys website.
Austral Wright Metals – Ferrous, non-ferrous and high performance alloys. (June 10, 2020). Incoloy 825 – properties, applications, manufacturing, machinability and weldability of Incoloy 825. AZ. Retrieved August 14, 2022 from https://www.azom.com/article.aspx?ArticleID=4245.
Austral Wright Metals – Ferrous, non-ferrous and high performance alloys. “Incoloy 825 – Properties, Applications, Manufacture, Processability and Weldability of Incoloy 825″. AZOM. August 14, 2022 . August 14, 2022 .
Austral Wright Metals – Ferrous, non-ferrous and high performance alloys. “Incoloy 825 – Properties, Applications, Manufacture, Processability and Weldability of Incoloy 825″. AZOM. https://www.azom.com/article.aspx?ArticleID=4245. (As of August 14, 2022).
Austral Wright Metals – Ferrous, non-ferrous and high performance alloys. 2020. Incoloy 825 – Properties, Applications, Fabrication, Processability and Weldability of Incoloy 825. AZoM, accessed 14 August 2022, https://www.azom.com/article.aspx?ArticleID=4245.
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