Alloy 825
Alloy 825 is an austenitic nickel-iron-chromium alloy also defined by additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing.
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Description
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Alloy 825 is an austenitic nickel-iron-chromium alloy also defined by additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing. With a nickel content range between 38%–46%, this grade exhibits pronounced resistance to stress corrosion cracking (SCC) induced by chlorides and alkalis. The chromium and molybdenum content also provides good pitting resistance in all environments except strongly oxidizing chloride solutions. Utilized as an effective material in a wide variety of process environments, alloy 825 maintains good mechanical properties from cryogenic temperatures up to 1,000° F.
MECHANICAL PROPERTIES
Alloy 825 can be provided in the annealed condition or strengthened through the pilger process. Alloy 825 maintains useful mechanical properties up to about 1000°F (538°C) and good toughness down to cryogenic temperatures.
SERVICE TEMPERATURE
Alloy 825 is used at temperatures from cryogenic up to 1000°F (540°C). The use of Alloy 825 at temperatures above 1000°F (538°C) is not recommended as harmful phases can form with a negative effect on impact toughness and ductility.
CORROSION RESISTANCE
Alloy 825 has a PREN of 31 and a significant nickel content of 42%, which provides good corrosion resistance in many environments, including reducing and oxidizing acids, organic acids, seawater, salts, and alkalis. It is particularly resistant to sulfuric and phosphoric acids. The molybdenum addition gives Alloy 825 good resistance to chloride-induced localized corrosion, including pitting, crevice corrosion, and stress corrosion cracking. Additionally, alloy 825 has good oxidation resistance.
Size Range
|
Outside Diameter (OD) |
Wall Thickness |
|
.250”–.750” |
.035”–.065” |
Cold finished and bright annealed tube.
Chemical Requirements
Alloy 825 (UNS N08825)
Composition %
|
Ni |
Cu |
Mo |
Fe |
Mn |
C Carbon |
Si |
S |
Cr Chromium |
Al |
Ti |
|
38.0–46.0 |
1.5–3.0 |
2.5–3.5 |
22.0 min |
1.0 max |
0.05 max |
0.5 max |
0.03 max |
19.5–23.5 |
0.2 max |
0.6–1.2 |
Dimensional Tolerances
|
OD |
OD Tolerance |
Wall Tolerance |
|
.250"–.500" excl |
+.004”/-.000” |
± 10% |
|
.500”–.750” incl |
+.005”/-.000” |
± 10% |
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