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Inconel 825 Fittings Flanges Manufacturer

Incoloy 825

INCOLOY® alloy 825 (UNS N08825/W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The alloy’s chemical composition, is designed to provide exceptional resistance to many corrosive environments. 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.

Physical Properties

Density, lb/in3…………………..0.294
Density, Mg/m3 ………………..8.14
Melting Range, °F ……………..2500-2550
Melting Range,°C ………………1370-1400
Specific Heat, Btu/lb•°F ………0.105
Specific Heat, J/kg•°C …………440
Curie Temperature, °F…………<-320
Curie Temperature,°C …………<-196
Permeability at 200 oersted (15.9 kA/m)……..1.005

Chemical Composition

Nickel ……………………………38.0-46.0
Iron……………………………….22.0 min.
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 ……………………..1.0 max.
Sulfur …………………………….0.03 max.
Silicon ……………………………0.5 max.
Aluminum……………………….0.2 max.

Designation & Standards

Rod, Bar, Wire and Forging Stock: BS 3076NA16, ASTM B 425, ASTM B 564, ASME SB 425, ASME SB 564, ASME Code Case N-572, DIN 17752, DIN 17753, DIN 17754, VdTÜV 432, ISO 9723, ISO 9724, ISO 9725

Plate, Sheet and Strip: BS 3072NA16, BS 3073NA16, ASTM B 424, ASTM B 906, ASME SB 424, ASME SB 906, DIN 17750, VdTÜV 432, ISO 6208

Pipe and Tube: BS 3074NA16, ASTM B 163, ASTM B 423, ASTM B 704, ASTM B 705, ASTM B 751, ASTM B 775,
ASTM B 829, ASME SB 163, ASME SB 423, ASME SB 704, ASME SB 705, ASME SB 751, ASME SB 775, ASME SB
829, ASME Code Case 1936, DIN 17751, VdTÜV 432, ISO 6207

Others– ASTM B 366, ASME SB 366, DIN 17744.

Applications

Alloy 825 is used in the oil and gas industry and in a wide variety of chemical processes. Typical application
fields include:

  • Pipes, tubes and fittings in the oil and gas extraction, e. g. in heat exchangers, evaporators, washers, immersion
    pipes in sea water cooled heat exchangers, offshore piping.
  • Components in sulfuric acid pickling plants like heating coils, vessels, boilers, baskets and chains.
  • Heat exchangers, evaporators, washers, immersion pipes in phosphoric acid production.
  • Food industry