NAS 329J3L (UNS S32205, S31803)
NAS High Corrosion Resistant Duplex Stainless SteelNAS 329J3L (SUS 329J3L, UNS S32205, S31803) is an Austenitic-ferritic stainless steel, which has superior corrosion
resistance and high strength. It has better localized corrosion resistance than Type 316L and 317L, and the steel isapplied in the industrial fields like chemical plant, seawater desalination plant, seawater pump, and so on. Nippon
Yakin supplies this product in plate, sheet and strip form.

Steel Grade/StandardNASJIS G4304/4305

ASTM A240

EN 10088-2/10028-7

NAS 329J3L

SUS 329J3L

UNS S32205/S31803

1.4462

Chemical Composition[wt %]CSi

MnPSNi

CrMo

N

Specification(SUS 329J3L)

0.030

1.00

2.00

0.040

0.030

4.50~
6.50

21.00~
24.00

2.50~
3.50

0.08~
0.20

Specification(UNS S32205)

0.030

1.00

2.00

0.030

0.020

4.5~
6.5

22.0~
23.0

3.0~
3.5

0.14~
0.20

Specification(UNS S31803)

0.030

1.00

2.00

0.030

0.020

4.5~
6.5

21.0~
23.0

2.5~
3.5

0.08~
0.20

Physical Properties
Density[g/cm3]

7.80

Specific heat

[J/kg . K]

460

Electrical resistivity[μΩ . cm]

87.0

Thermal conductivity[W/m . K]

13.9

Average coefficient of thermal expansion [10–6/°C]

Young’s modulus[MPa]

Magnetism
Melting range

20~100°C

12.7

20~200°C

13.1

20~300°C

13.5

20~400°C

13.8
19.5 × 104
Y (magnetizable)[°C]

1420~1465

NAS 329J3L (UNS S32205, S31803)

It consists of 40~50% of ferritic phase and the rest of austenitic phase. (Grey part

Microstructure

is ferritic phase and white part is austenitic phase)

A cross sectional microstructureof 16mm thick plate

Mechanical Properties
Mechanical Properties at Room Temperature
0.2% proof stress Tensile strength
[MPa]

[MPa]

Specification (SUS 329J3L)

450

Specification (UNS S32205)
Specification (UNS S31803)

Elongation

Hardness

Example

[%]

[Hv]

620

18320

302

450

655

25—

293

450

620

25—

293

16mmt

563

780

35—

222

Cold-rolled sheet  2mmt

630

828

28253

—

Hot-rolled plateCorrosion Resistance[HB]

Local corrosion resistance such as pitting, crevice, and stress corrosion cracking ofNAS 329J3L is better than conventional stainless steel such as type 304 and 316L.
General corrosion resistance in acidic environment is good if the acid content islow.

Pitting Corrosion Resistance
ASTM G48 Method A
Alloy

ASTM G48 Method C22°C50°C

Critical pitting corrosion temperature
CPT (°C)

SUS 304

××10

SUS 316L

××15NAS 329J3L○×50

Test conditions

ASTM G48 Method A (○: No pitting corrosion, ×: Pitting corrosion)• Test solution: 6%FeCl3• Test temperature: 22°C, 50°C (Recommended temperature in this test)• Test time: 72h

ASTM G48 Method C• Test solution: 6%FeCl3 + 1%HCl• Test time: 72h

NAS 329J3L (UNS S32205, S31803)

Crevice Corrosion Resistance
ASTM G48 Method D

Alloy

Critical crevice corrosion temperature CCT (°C)

< –10
< –10

SUS 304
SUS 316L
NAS 329J3L
Test conditions

25
ASTM G48 Method D• Test solution: 6%FeCl3 + 1%HCl• Test time: 72hStress Corrosion Cracking Resistance
MgCl2 concentration (boiling point (°C) are in brackets)
Alloy

45%

42%

40%

38%

35%

30%

25%20%(155°C)(143°C)(138°C)(134°C)(126°C)(115°C)(110°C)(108°C)SUS 304

××××××××

SUS 316L

×××××××○

NAS 329J3L

××××××○○Test conditions• Immersion in boiling MgCl2 solution• Test time: 300h
• U-bend test specimen is used.

○: No stress corrosion cracking
×: Stress corrosion cracking

Acid Resistance

AlloyCorrosion rate in sulfuric acid at 80°C (mm/y)
5%

10%

20%

40%60%

80%

SUS 304

1.93

14.59

195.2

1347

231.8

151.4

SUS 316L

1.67

4.69

71.91

764.9

704.5

33.74

NAS 329J3L

0.01

0.17

4.65365.91456

106.4
Test time: 24h

AlloyCorrosion rate in hydrochloric acid at 80°C
(mm/y)
0.1%

1%

2%

3%

SUS 304

0.02

2.42

7.16

18.99

SUS 316L

0.02

2.73

6.75

14.88

NAS 329J3L

0.02

0.03

31.10

60.62
Test time: 24h(Reference)

Nippon YakinJISUNS No.

Chemical composition

SUS 304

SUS 304

S3040018Cr-8Ni

SUS 316L

SUS 316L

S3160317Cr-12Ni-2Mo

NAS 329J3L

SUS 329J3L

S3220522Cr-5.3Ni-3.2Mo-0.16N

NAS 329J3L (UNS S32205, S31803)

Workability

High temperature strength is similar to Type 430 in the range of 950~1150°C.
However the steel shows rapid increase in the strength below 900°C. Regarding
cold workability, care is required as proof stress is high and elongation is low incomparison with Type 304.

Weldability

Various welding methods are applicable in the same manner as with the standard
austenitic stainless steels, including shielded metal arc welding, TIG welding, andplasma welding. Use of welding electrodes for UNS S32205 is recommended.
Preheating and postheating are not necessary. In welding, the interpass temperature should be no more than 100°C in order to prevent formation of intermetallic
compounds.

Heat Treatment

Solution annealing of NAS 329J3L should be performed at 1040°C and higher
followed by being quenched in water or rapidly cooled by other means. (Conditions
provided in ASTM A480/A480M)

Pickling

A mixture of nitric acid and fluoric acid is used in pickling. However, because
descaling is somewhat difficult in comparison with Type 304, alkali immersion
before acid pickling, and if possible, shot blasting are extremely effective.

Applications• Chemical Plant, Chemical Tanker• Seawater desalination Plant, Seawater pump• Thermal power plant flue gas desulfurization plants• Pulp and paper plants• BridgeCertification

It is possible to manufacture UNS S32205/S31803 in accordance with theNORSOK standard below. The thickness is up to 50mm.
• NORSOK M-650• NORSOK M-630 MDS D45

For more information, please contact:
Nippon Yakin Kogyo Co., Ltd.
Material Solutions Sales Department
San-Ei Bldg., 5-8, 1-chome Kyobashi, Chuo-ku,
Tokyo 104-8365 Japan
TEL: +81-3-3273-4649 FAX: +81-3-3273-4642
E-Mail: inquiry@nyk.jp
URL: http://www.nyk.co.jp/en/Note regarding the handling of property data:
The technical information contained in this product guide is representativevalues obtained in property tests and other items used to explain the performance of the product. With the exception of items specifically mentioned
as provisions of a “Standard,” the contents do not represent guaranteed
upper limit or lower limit values. The respective data given on this technicalinformation are typical examples and may be different in some cases fromthe data obtained from the actual product. No responsibility shall, therefore,
be assumed for damages arising from using the technical information data.
This information is also subject to change in the future without notice. To
obtain the most recent information, please contact Nippon Yakin.

2016.6.10