Alloy 825 Technical Information
Robert-James Sales, Inc.
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A l l o y s

Alloy 20
2205
Alloy C-276
317L
310S
321/321H
347/347H
254SMO
AL-6XN
6061 T6
904L
410
304/304L
316/316L
Alloy 200
Alloy 400
Alloy 600
Alloy 625
Alloy 800/800H/800HP
Alloy 825

Alloy 825
Chemical Composition %

C Cr Fe Ni Al Ti Cu Mo
Max   Max   Max     Max
0.05 19.25-23.5 0.50 38.0-46.0 0.2 0.6-1.2 1.5-3.0

2.5-3.5


AVAILABILITY
Seamless Pipe 1/2" - 8"
Welded Pipe 8" - 12"
Butt-Weld Fittings 1/2" - 8"
Flanges 1/2" - 8"
Bar 1" - 6"SPECIFICATIONS
ASTM B443, 8705, 8366, B425, B564
ASME SB443, SB705, SB366, SB925, SB564

DESCRIPTION
Alloy 825 is a Nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. The alloys chemical composition provides exceptional resistance to many corrosive environments. The Nickel content is sufficient for resistance to Chloride-ion stress corrosion cracking. The nickel, combined with molybdenium and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acid. The molybdenium also aids resistance to pitting and crevice corrosion. The alloys Chromium content confers resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salts. The titanium addition, with appropriate heat treatment, will stabilize the alloy against sensitization to intergranular corrosion.

DESIGN FEATURES
Good resistance to stress corrosion cracking.
Satisfactory resistance to pitting and crevice corrosion.
Good resistance to oxidising and non-oxidising hot acids.
Good mechanical properties at both room and elevated temperatures up to approximately 550 deg.C (1020 deg. F).
Permission for pressure-vessel use at wall temperature up to 425 deg. C (800 deg. F).

TYPICAL APPLICATIONS
Components such as heating coils, tanks, crates, baskets and chains in sulfuric acid pickling plants
Fuel element dissolvers-the alloy withstands the different media (sulfuric and nitric acids, caustic hydroxide etc.) used in processing
Sea water cooled heat exchangers; offshore product piping systems tubes and components in sour gas service - resistant to chloride-ion stresscorrosion cracking
Pipelines carrying wet sulphur dioxide gas and pulp digesters in the papermaking process
Heat exchangers, evaporators, scrubbers, etc. used in phosphoric acid production
Air cooled heat exchangers used in the processing of liquid petroleum gas (LPG)

TENSILE REQUIREMENTS
Tensile Strength (KSI) 85
Yield Strength (KSI) 35

KSI can be converted to MPA (Megapascals) by multiplying by 6.895.

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