Duplex (Austenitic+ Ferritic) Pipes and Tubes

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.


International Equivalent of Stainless Steel Grades (Comparing International Standards)




Austenitic Stainless Steel grades


JSL Designation/Grade
UNS Designation
USA-Canada/ AISI-ASTM-ASME
INDIA/ IS Letter Symbol
European
Chinese
GERMANY/DIN Designation
Japan/JIS
GOST
Austenitic Cr-Mn
J-201
S20100
201
X10Cr17Mn6Ni4N20
-
-
X12CrMnNiN17-7-5
SUS201
-
J-201L
S20103
201L
-
1.4371
-
X2CrMnNiN17-7-5

-
J-201LN
S20153
201LN
-
-
-
-

-
J-202
S20200
201
X10Cr18Mn9Ni5
-
-
X12CrMnNiN18-9-5

-
J-204Cu
S20430
-
-
-
-


-
JSLAUS ( J1)
-
-
-
-
-
-
-
-
J-4
-
-
-
-
-
-
-
-
Austenitic Cr-Ni
J-301
S30100
301
X10Cr17Ni7
1.4310
1cR17nI7
X12CrNI17-7
SUS301
-
J301L
S30103
301L
-
-
-
-
-
-
J301LN
S30153
301LN
-
1.4318
-
X2CrNiN18-7
-
-
J-304
S30400
304
X4Cr19NiN9
1.4301
0Cr18Ni9
X5CrNi18-10
SUS304
-
J-304H
S30409
304H
-
-
-
-
-

J-304L
S30403
304L
-
1.4307
-
X2CrNi18-9
SUS304L

J-304LN
S30453
304LN
-
1.4311
-
X2CrNi18-10
SUS304LN

J-309
S30900
309
X15Cr24Ni13
1.4828
-
-
-

J-309S
S30908
309S
-
1.4833
1Cr23Ni13
X7CrNi23-14
SUS309S

J-310
S31000
310
X20Cr25Ni20
-
-
X15CrNiSi25-20
SUH310
20Ch25N2052
J-310S
S31008
310S
-
1.4845
0Cr25Ni20
X12CrNi25-21
SUS310S
2Ch23N18
J-316
S31600
316
X04Cr17Ni12Mo2
1.4401
0Cr17Ni12Mo2
X5CrNiMo17-12-2
SUS316
-
J-316L
S31603
316L
X02Cr17Ni12Mo2
1.4404
00Cr17Ni14Mo2
X2CrNiMo17-13-2
SUS316L
-
J-316LN
S31653
316LN
-
1.4429
-
X2CrNiMoN17-11-2
SUS316LN
-
J-316Ti
S31635
316Ti
X04Cr17Ni12Mo2Ti
1.4571
0Cr18Ni12Mo2Ti
X6CrNiMoTi17-12-2
SUS316Ti
10Ch17N13M2T
J-317
S31700
317
-
-
-
-
-
-
J-317L
S31703
317L
-
1.4438
00Cr19Ni13Mo3
X2CrNiMo18154
SUS317L
-
J-317LN
S31753
317LN
-
-
-
-
-
-
J31727
S31727
-
-
-
-
-
-
-
J-321
S32100
321
X04Cr18Ni10Ti
1.4541
0Cr18Ni10Ti
X6CrNiTi18-10
SUS321
08Ch18N10T
J-347
S34700
347
X04Cr18Ni10Nb
1.4550
0Cr18Ni11Nb
X6CrNiNb18-10
SUS347
08Ch18N12B

Austenitic Stainless Steel grades are characterized by superior corrosion and oxidation resistance, weld ability, ductility and toughness compared to ferritic and martensitic Stainless Steel grades for similar levels of chromium. Austenitic Stainless Steel grades exhibit excellent resistance to atmospheric corrosion. They effectively withstand attack of organic acids (e.g. acetic, lactic, citric etc.), exhibit good resistance to oxidizing acids (e.g. nitric acid) and fair resistance to mineral acids (e.g. sulfuric acid). Some grades work hardens to a high degree while others have been developed to minimize this tendency. Work hardening is advantageous in certain cases where high strength is required. Austenitic Stainless Steel grades are nonmagnetic in annealed condition but depending on composition, they may become mildly magnetic when cold worked.

These Stainless Steel grades possess good high temperature properties such as creep strength and resistance to oxidation or scaling. They also exhibit excellent low temperature ductility and impact strength. Austenitic Stainless Steel grades can be readily fabricated by bending, drawing, spinning, punching, drilling, machining and welding and can be readily polished to a high finish. These attributes make them very versatile and popular for diverse applications in a variety of industries. There are two broad categories of Austenitic Stainless Steel — chrome nickel (300 Series) and chrome manganese (200 Series). Currently, chrome-nickel is the largest produced Stainless Steel category globally.

Typical applications for this category include food processing, chemical plants, pharmaceutical equipment, hospitals, textile, architectural, building construction, kitchenware, consumer durables etc.

Chrome-manganese Stainless Steel is the fastest growing of all Stainless Steel categories on account of its high performance to cost ratio. Its applications include kitchenware, cutlery, sinks, automotive trim, architectural, buildings, furniture, buses, trains and ornamental tubes.

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