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321/321H
(UNS N08825)

Products

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, B705, B366, B425, B564
ASME SB443, SB705, SB366, SB925, SB564

CHEMICAL COMPOSITION %

C Cr Fe Ni Al Ti AL/Ti
    MIN        
.06-.10 19.0-23.0 39.5 30.0-35.0 .15-.60 .15-.60 .85-1.20

DESCRIPTION

Alloy 825 is a Nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. The alloy chemical composition provides exceptional resistance to many corrosive environments. The Nickel content is sufficient for resistance 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 alloy 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.
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DESIGN FEATURES

TYPICAL APPLICATIONS

Components such as heating coils, tanks, crates, baskets and chains in sulfuric acid pickling plants. Fuel element dissolvers where the alloy withstands different media (sulfuric and nitric acids, caustic hydroxide, etc.) used in processing. Sea water cooled heat exchangers; offshore product piping system tubes and components in sour gas service – resistant to chloride-ion stress-corrosion 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
KSJ can be converted to MPA (Megapascals) by multiplying by 6.895


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