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825 / 2.4858

Alloy 825 is a titanium-stabilized, fully austenitic nickel-iron-chromium alloy with additions of copper and molybdenum. Alloy 825 is characterized by:

- Approval for pressure vessels with operating temperatures up to 425 ° C

- good resistance to stress corrosion cracking

- good resistance to oxidizing and non-oxidizing hot acids

- good mechanical properties at both room and elevated temperatures up to 550 ° C

- satisfactory resistance to pitting and crevice corrosion

Material Data Sheet

Material Designation 2.4858
Alloy Alloy 825
EN Material Symbol NiCr21Mo
UNS N 08825
VdTÜV Datasheet 432/1
ISO NiFe30Cr21Mo3

Main fields of application of alloy 825

Typical examples for the use of 825 are as follows:

- chemical plants

- Air-cooled heat exchangers in LNG process (LPG)

- Heat exchangers, evaporators, scrubbers, fork tubes, in the phosphoric acid production

- Components in sulfuric acid pickling lines, such as heating coils, tanks, boilers, baskets and chains

- Fuel element for a variety of media, such as dissolver sulfuric and nitric acid, sodium hydroxide, etc., which are used in the recycling process

- Food preparation

- seawater-cooled heat exchangers, offshore pipelines, pipes and parts in natural gas operation

Chemical composition of alloy 825

C Si Mn P S Cr Mo
% ≤ % ≤ % ≤ % ≤ % % %
0.025 0.5 1.0 0.02 0.015 19.5-23.5 2.5-3.5
Ni Al Co Cu Fe Ti B
% % ≤ % ≤ % % % ≤ %
38.0-46.0 0.2 1.0 1.5-3.0 rest 0.6-1.2 0-0.006

Characteristics of alloy 825

Temperature Range up to 550°C
Density 8.1 g/cm³
Melting Range 1370°C – 1400°C
Elongation at break of Alloy 825 30 %
ISO-V notch impact toughness ≥ 150 J/cm² at room temperature, lengthwise (only bars and forgings)
  ≥ 100 J/cm² at room temperature, across

Filler metal (for welding with alloy 825)

Alloy 825 can be welded by all conventional methods.

The following welding is recommended:

SG- NiCr21Mo9NbFilter Rod2.4621
EL- NiCr20Mo9Nb

Delivery program

Sheets / Plates mm

2 - 15

Precision strip mm


With short delivery time:

plates or sheets, tubes, flanges, forged or die-cut rings and round blanks, elbows, T-fittings, reductions, screws, nuts or washers according to your request. According to your individual wishes, we are able to cut our material with our plasma- or water jet cutter. Our material is stocked in superformats of 2000x6000mm. Cut to size on request.

Material Outlet by Hempel

ECONOXX.com offers buyers a new and uncomplicated procurement channel, which also includes small quantities and materials in special alloys at favourable conditions.

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