Duplex Stainless
Steel
JSL Designation/Grade
|
UNS Designatoin
|
USA-Canada/ AISI-ASTM-ASME
|
INDIA/ IS LEtter Symbol
|
European
|
Chiness
|
GERMANY/DIN Designation
|
Japan/JIS
|
GOST
|
|
Duplex (Austenitic + Ferritic)
|
|||||||||
J-2205
|
S32205
|
2205
|
-
|
-
|
-
|
-
|
-
|
-
|
|
J-31803
|
S31803
|
-
|
-
|
1.4462
|
-
|
X2CrNiMoN22-5-3
|
SUS329J3L
|
-
|
|
J-2304
|
S32304
|
2304
|
-
|
1.4362
|
-
|
XCrN N 23-4
|
-
|
-
|
|
Duplex Stainless Steel grades contain relatively high
chromium (between 18% and 28%) and moderate amounts of nickel (1% to 8%). This
combination of ferritic and austenitic structures is called duplex. Many of
these grades contain molybdenum (1% to 5%) and nitrogen (0.05% to 0.3%). Some
duplex Stainless Steel grades also contain manganese (up to 5%), copper (up to
2%) and tungsten (up to 2%). These grades exhibit high resistance to stress,
corrosion cracking and chloride ion attack and have higher yield strength than
that of austenitic or ferritic steel grades. These properties combined with
suitable design lead to material saving. High quality fabrication and welding
are possible if the operator is trained well. These grades are used in marine
applications, offshore platforms, paper and pulp industry, chemical,
petrochemical and desalination plants.
