Carlson Alloy C 825 Nickel-Iron-Chromium Alloy

Subcategory: Superalloy; Nickel Alloy

Key Words: UNS N08825

Material Notes:
General Description

Carlson Alloy C 825 is a nickel-iron-chromium alloy, developed for use in extremely corrosive environments. The nickel content of this alloy makes it resistant to chloride-ion stress corrosion cracking; and in combination with its molybdenum and copper content, endows C 825 with resistance to oxidizing environments. When heated in the critical sensitization temperature range of 1200°F to 1400° (650°C to 760°C), C 825 resists pitting and intergranular attack.

Applications

C 825 is utilized in numerous corrosive environments, including the processing and storage of reducing acids such as sulfuric and phosphoric solution. It is also used in various oxidizing environments, including nitric and acid solutions, nitrates and oxidizing salts.

C 825 offers excellent resistance to corrosion by sea water

• Chemical Processing – heat exchangers, evaporators, pumps, piping, valves, vessels, expansion bellows, tank trucks, scrubbers, condensers, tank and vessel linings; and for processing and handling sulfuric acid, phosphoric acids, hydrofluoric acid, nitric acid, nitrates and oxidizing salts.
• Pulp and Paper – wet scrubber linings in systems using sodium sulfite and sodium bisulfate solutions.
• Pickling Processes – tank heaters and hooks
• Ore Processing – hydrometallurgy and plate heat exchangers in copper refining.
• Pollution Control – Hopper bottoms and trays in electrostatic precipitators; ducts and dampers, stack-gas reheaters, waste heat recovery exchangers, stack liners and other wet scrubber components; sludge-incinerator wet scrubbers; marine inert-gas scrubbers; radwaste evaporator systems.

Information provided by Carlson