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.
Piping Definitions
Alloys 
