The austenite and ferrite micro-structure of duplex
stainless steel has a number of benefits over austenitic stainless steel.
Much improved since their introduction in the 1930’s, the low nickel content of
duplex stainless steels makes them a more cost effective option.
The use of nitrogen as a replacement for expensive nickel gives several
advantages, including enhanced tensile properties and greater resistance to
pitting and crevice corrosion, and they are twice the strength of austenitic
stainless steels. Their lighter weight also makes duplex stainless steels
cheaper to transport and assemble.
NeoNickel have over 30 years experience, supplying metal alloy solutions to a
range of complex and challenging industries around the world. During this time
the use of duplex stainless steel has grown and is a popular choice for a number
of reasons including its price stability and higher strength.
Stainless Steel is used in many diverse applications including hot water and
brewing tanks and is also frequently found in swimming pool structures where it
is used in water temperature applications and disinfection systems.
The most widely used stainless steel is Duplex
2205 and is often referred to as the workhorse grade. It provides superior
protection against corrosion than most grades of stainless steel in the majority
Duplex stainless steels are used in corrosive environments where they will be
exposed to chloride and high temperatures and are a crucial component of the
shipbuilding industry. Their ability to withstand exposure to aggressive
chemicals means they are used to build most chemical tankers. Their mechanical
properties can reduce the tanker’s weight by up to 10%.
There has been a significant increase in the use of duplex stainless steels
in the chemical processing industry. They are an important component of the oil
and gas exploration, transportation and refinement business and are a cost
effective material for pollution control equipment.
Duplex stainless steel is also used in pulp and paper production and is
widely utilised in mining and even nuclear plants. The steel is also a favourite
of the construction industry and has been used in a variety of high profile
architectural projects due to its aesthetic and structural properties.
Fabrication and welding
Easy welding and machining means that duplex stainless steel is often a
cheaper option than other materials and is faster to weld than high nickel
alloys. Standard rolls and dies can be used to form most shapes making duplex a
cost efficient solution.
The most outstanding feature of duplex stainless steels is their resistance
to chloride stress corrosion cracking (CLSCC), a common cause of deterioration
in stainless steel pipes and containers widely used by petrochemical
Wrought austenitic steels are prone to stress corrosion cracking and have a
tendency to crack-before-break as a result of CLSCC and as these cracks can fill
with residue it is not always possible to identify a leak. NeoNickel understands
that the consequences of CLSCC can be costly and catastrophic and are dedicated
to creating high quality alloys that bring peace of mind to our customers.
To learn more about Duplex Stainless Steels contact
a member of our team today and we’ll be happy to help you.