Incoloy Alloy 825 Seamless Nickel Alloy Pipe BS 3074NA16 ASTM B 163
ASTM B 423
Incoloy Alloy 825 seamless Nickel Alloy Pipe, BS 3074NA16 ASTM B
163 ASTM B 423 ASTM B 704 ASTM B 705 ASTM B 751
Incoloy Alloy 825
Common Trade Names: Incoloy 825, Alloy 825, Nickelvac 825, Nicrofer
4241.
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.
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
INCOLOY 825 SEAMLESS TUBES
UNS No: UNS N08825
Werkstoff Nr: 2.4858
The above names are trade names and/or trademarks of specific
manufactures including Special Metal Corporation. Prosaic Steel
& Alloy is not affiliated with any manufacturer(s). Orders will
be filled to meet specifications from any available source(s).
Names are listed solely for reference to help identify products
consistent with listed specificationsto help identify products
consistent with listed specifications.
Specifications Incoloy 825 Tubes- UNS N08825
Product Range -Seamless tubes 6 mm OD x 0.7 mm to 50.8 mm OD x 3 mm
thk.
Specifications - B 163 / B 423.
Finish Conditions-Cold Drawn Solution Annealed & Pickled / Cold
Drawn Bright annealed / NACE MRO 175
Incoloy alloy 825 is a nickel-iron-chromium alloy with additions of
copper, molybdenum 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 nitrates,
nitric acid and oxidizing salts. The titanium addition serves, with
an appropriate heat treatment, to stabilize the alloy against
sensitization to intergranular corrosion. The resistance of Incoloy
825 to general and localized corrosion under diverse conditions
gives the alloy broad usefulness. Applications include chemical
processing, pollution control, oil and gas recovery, acid
production, pickling operations, nuclear fuel reprocessing and
handling of radioactive wastes.
.The outstanding property of Incoloy 825 is its corrosion
resistance. In reducing & oxidising conditions, Incoloy 825
resists general corrosion, pitting & crevice corrosion,
intergranular corrosion and stress corrosion cracking. It is
particularly useful in sulphuric & phosphoric acids, sulphur
containing flue gases, sour gas and oil wells and sea water.
Incoloy 825 is approved for pressure vessel operating temperatures
up to 525C (AS1210, AS4041), 538C (ASME Boiler & Pressure
Vessel Code, Sections I, III, VIII, IX, Cases 1936, N-188). Brittle
phases may form in alloy 825 at temperatures above ~ 540C, so it is
not normally used at these temperatures, where creep-rupture
properties would be design factors.
Chemical Composition of Incoloy Alloy 825
Table 1. Chemical composition of Incoloy Alloy 825 (ASTM B163
Heat exchanger tube)
Element | % | Element | % |
Nickel | 38.0--46.0 | Carbon | 0.05 max |
Chromium | 19.5--23.5 | Manganese | 1.0 max |
Molybdenum | 2.5--3.5 | Sulfur | 0.03 max |
Copper | 1.5 --3.0 | Silicon | 0.5 max |
Titanium | 0.6--1.2 | Aluminium | 0.2 max |
Iron | 22.0 min (~33%) | | |
Tensile Properties of Incoloy Alloy 825
Table 2. Typical room temperature tensile properties (not for
design. Consult the relevant material or product specification for
design values)
Form
| | Condition | | 0.2% Proof Stress
MPa | | Tensile Strength
MPa | | Elong
% |
Tube | | Annealed | | 440 | | 770 | | 35 |
Tube | | Cold drawn | | 880 | | 1000 | | 15 |
