What is the temperature range for Inconel 825?
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 additions of molybdenum, titanium, and copper. The alloy is commonly referred to by the trade name Incoloy® 825 and the generic name UNS N08825.
Properties
Corrosion Resistance
Alloy 825 has good corrosion resistance in a wide range of environments, including reducing and oxidizing acids, organic acids, seawater, salts, and alkalis. It is particularly resistant to sulfuric and phosphoric acids. The addition of molybdenum gives Alloy 825 good resistance to chloride-induced localized corrosion, including pitting, crevice corrosion, and stress corrosion cracking. Alloy 825 also has good oxidation resistance.
Service Temperature
Alloy 825 has a service temperature range from cryogenic to 1000°F (540°C). It is not recommended to use Alloy 825 at temperatures above 1000°F (538°C) because deleterious phases may form, which negatively affect impact toughness and ductility.
Mechanical Properties
825 alloy is available in the annealed condition and can be strengthened by the pilger process. 825 alloy retains useful mechanical properties up to about 1000°F (538°C) and maintains good toughness down to cryogenic temperatures.
Heat Treatment
825 alloy cannot be strengthened by heat treatment. For high temperature applications or products that require welding, a stabilization anneal at about 1725°F (940°C) is recommended. At this temperature, the carbon is bound up in the form of titanium carbides. This prevents precipitation of chromium carbides at grain boundaries (i.e., sensitization) during service or welding. For optimum toughness and ductility, higher temperature anneals are used.
Machinability
825 alloy is readily hot- and cold-worked.
Applications
825 alloy is widely used in the oil and gas industry. Other uses include chemical equipment, exhaust systems, and power generation. CRA offers specialty 825 alloy seamless tubing for a variety of industries and applications including:
Exhaust Systems,
Power Generation,
Oil and Gas,
Chemical Equipment
