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Alloy 825 (UNS N08825/W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of copper, molybdenum and titanium. The chief characteristic of Alloy 825 tubing is its corrosion resistance; the alloy was designed with a specific chemical composition that provides exceptional resistance to many corrosive environments such as sulfuric acid, phosphoric acid, sulfur containing flue gases, sour gas and oil wells, and sea water.
The nickel content in Alloy 825 provides resistance to chloride-ion stress corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives Alloy 825 tubing great resistance to reducing environments, like those containing sulfuric and phosphoric acids. Aiding resistance to pitting and crevice corrosion is one of the chief benefits of the molybdenum. Resistance to a variety of oxidizing substances such as nitric acid, nitrates, and oxidizing salts comes from the chromium content. Titanium, often with heat treatment, serves to stabilize the alloy against sensitization to inter granular corrosion.
Alloy 825 tubing has excellent corrosion resistance. The possession of this resistance to both general and localized corrosion under diverse conditions is what allows this alloy to have a broad usefulness and wide range of applications. Such applications include the handling of radioactive wastes, nuclear fuel reprocessing, pickling operations, acid production, oil and gas recovery, pollution control and chemical processing. This alloy offers exceptional resistance to corrosion by sulfuric and phosphoric acids and is often the most cost effective alloy in sulfuric acid service.
Chemical Composition
Weight % Ni Fe Cr Mo Cu Ti C Mn S Si Al
Alloy 825 38 - 46 22 min 19.5 - 23.5 2.5 - 3.5 1.5 - 3 0.6 - 1.2 0.05 max 1 max 0.03 max 0.5 max 0.2 max
Alloy 825 is a nickel-iron-chromium alloy with additions of molybdenum and copper. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localised attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulphuric and phosphoric acid. Alloy 825 is used for chemical processing, pollution control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production and pickling equipment and handling of radioactive wastes.
Typical Mechanical Properties
Material Form and Condition Tensile Strength MPa Yield Strength (0.2% Offset) MPa Elongation (%)
Alloy 825 Tube Annealed 772 441 36
Alloy 825 Tube Cold Drawn 1000 889 15
Specifications
UNS N08825
WS 2.458
FMC Spec M41104, M40116, M40154
NACE MR-0175/ISO 15156
Alloy 825 Pipe and Tube
BS 3074 NA16
ASTM B163, ASME SB 163
ASTM B 423, ASME SB 423
ASTM B704, ASME SB 704
ASTM B 705, ASME SB 705
ASTM B 751, ASME SB 751
ASTM B 755, ASME SB 755
ASTM B 829, ASME SB 829
DIN 17751, VdTUV 432
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