Incoloy Alloy 825

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Description

INCOLOY alloy 825 (UNS N08825, W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The nickel content is sufficient for resistance to chloride-ion stress-corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids. The molybdenum also aids resistance to pitting and crevice corrosion. The alloy’s chromium content confers resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salt. The titanium addition serves, with an appropriate heat treatment, to stabilize the alloy against sensitization to intergranular corrosion.

Specifications

INCOLOY Alloy 825 is designated as UNS N08825 and Werkstoff Number 2.4858. It is listed in NACE MR0175 for oil and gas service.
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Incoloy Alloy 825  is a Registered Trademarks of Special Metals Corporation and Its subsidiaries.

Chemical Composition

Nickel………………………………………………………………..38.0-46.0
Iron…………………………………………………………………….22.0min.
Chromium…………………………………………………………..19.5-23.5
Molybdenum ………………………………………………………….2.5-3.5
Copper………………………………………………………………….1.5-3.0
Titanium…………………………………………………………………0.6-1.2
Carbon………………………………………………………………0.05 max.
Manganese………………………………………………………….1.0max.
Sulfur………………………………………………………………..0.03max.
Silicon…………………………………………………………………0.5max.
Aluminum…………………………………………………………….0.2 max.