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.
info section