AVAILABILITY
Seamless Pipe 1/2" - 8"
Weld Pipe 1/2" - 12"
Butt-Weld Fittings 1/2" - 12"
Flanges 1/2" - 12"
Pressure Fittings 1/2" - 2"
150# Fittings 1/4" - 2"
Tubing 1/4", 3/8", 1/2"
Valves 1/2" - 12"
Bar 1" - 8"
SPECIFICATIONS
ASTM
B729, B464, B366, B473, B462
ASME
SB729, SB464, SB366, SB473, SB462
DESCRIPTION
Alloy 20 is one of the so-called "Super"
stainless steels that was designed for maximum resistance
to acid attack. It's nickel, chromium, molybdenum
and copper content contribute to its overall resistance
to chlorideon stress corrosion cracking and general
pitting attack. The alloy is stabilized with columbium
to minimize carbide precipitation during welding.
It has good mechanical properties and can be fabricated
with comparative ease. Athough the alloy was designed
for use in sulfuric acid related industries, it
finds wide usage throughout the chemical processing
industry. It also is used for processing pharmaceuticals,
food, gasoline, solvents, plastics, explosives,
synthetic fibers and many other products.
DESIGN
FEATURES
• Superior resistance to stress-corrosion
cracking in boiling 20 to 40% sulfuric acid.
• Excellent general corrosion resistance to
sulfuric acid.
• Excellent resistance to chloride stress
corrosion cracking.
• Excellent mechanical properties and
fabricability.
• Minimal carbide precipitation during welding.
TYPICAL
APPLICATIONS
Chemical and allied industries
Food and dye production
Heat exchangers
SO 2 scrubbers and other severe environments
Tanks
Pickling racks
Valves
TENSILE
REQUIREMENTS
Tensile Strength (KSI) 80
Yield Strength (KSI) 35KSI can be converted to MPA
(Megapascals) by multiplying by 6.895.
Technical Information
Alloys 
