What is the material of 825 pipe?
825 alloy nickel pipe
UNS N08825/W.NR. 2.4858
Common trade names: Incoloy 825, Inc825, Sanicro 41
Alloy 825 is a nickel-chromium-iron solid-solution strengthened alloy with a nominal chemical composition of 42% nickel, 21% chromium, and 22% iron, with additional additions of molybdenum, titanium, and copper. It is commonly known by the trade name Incoloy 825 and the common name UNS N08825.
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Corrosion graphics
Corrosion resistance
Alloy 825 has good corrosion resistance in many environments, including reducing and oxidizing acids, organic acids, seawater, salts and alkalis. It is particularly resistant to sulfuric acid and phosphoric acid. The addition of molybdenum gives Alloy 825 good resistance to localized corrosion caused by chlorides, including pitting, crevice corrosion and stress corrosion cracking. In addition, 825 alloy also has good oxidation resistance.
Operating temperature
Operating temperature
Alloy 825 can be used at temperatures as low as 1000°F (540°C). The use of Alloy 825 at temperatures above 1000°F (538°C) is not recommended due to the formation of deleterious phases that negatively affect impact toughness and ductility.
Mechanical behavior
Mechanical behavior
Alloy 825 is available in the annealed condition or strengthened by the Pilger process. Alloy 825 retains useful mechanical properties at temperatures up to about 1000°F (538°C) and retains good toughness at low temperatures.
heat treatment mark
heat treatment
Alloy 825 cannot be strengthened by heat treatment. For high temperature applications or where the product is to be welded, a stabilization anneal around 1725°F (940°C) is recommended. At this temperature, the carbon is bound as titanium carbide. This prevents chromium carbide precipitation (i.e. sensitization) from occurring at grain boundaries during use or welding. For optimal toughness and ductility, higher temperature annealing can be performed.
Processability
Workability
Alloy 825 is suitable for both hot and cold working.
Application areas
Alloy 825 is widely used in oil and gas applications. Other uses include chemical processing equipment, exhaust systems and power generation. CRA offers specialty alloy 825 seamless tubing for a variety of industries and applications, including:
Exhaust Systems Power Generation Petroleum and Gas Chemical Process Equipment
