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Duplex Stainless Steel

Duplex stainless steel plate in specification S31803 (1.4462) and S32205.

Duplex stainless steel was developed as a product which could improve upon some of the technical weaknesses of the standard austenitic and ferritic stainless steels that are available in the market. Both have low strength, ferritic steels have poor low temperature toughness, and austenitic steels have a very low resistance to stress corrosion cracking. Duplex stainless has a microstructure which is split roughly 50:50 between austenite and ferrite and balancing of these phases provides the following benefits:

  • ● Higher strength which is around twice that of Type 304 austenitic stainless steel. This leads to reduced plate thicknesses being used in fabrications reducing the weight which is of particular significance in items such as pressure vessels, storage tanks, and structural applications such as bridges.
  • ● Good weldability in thick plates.
  • ● Good low temperature toughness.
  • ● Resistance to stress corrosion cracking of importance in many applications including hot water tanks, process plant, brewing tanks, and desalination plant.

 

It is worth noting that Duplex stainless steels are still being developed and improved by steel makers.

Another key feature of Duplex stainless is its enhanced corrosion resistance. There is no single measure of corrosion resistance but the Pitting Resistance Equivalent Number (PREN) is widely used as a means of comparing the relative corrosion resistance of different steel grades. The PREN is obtained by applying a mathematical formula to the chemical composition of a steel so that PREN = %Cr (3.3 x %Mo) (16 x %N). Using this formula 31803 Duplex stainless has a PREN of 35 which when compared with the PREN of Type 304 and Type 316 (18 and 24 respectively) demonstrates its superior corrosion resistance.

In short, due to its higher strength, longer component life cycle, and lower alloy composition, Duplex stainless can be a very cost effective solution to an engineering problem.

1.4462 Duplex Steel Sheet

Duplex UNS S31803 / UNS S32205 | 1.4462

A wide range of large area duplex stainless steel plates which are certified to material grades UNS S31803, UNS S32205, and 1.4462. These steels are also compatible with the branded 2205 designation.

All material is produced and certified in accordance with NORSOK MDS D45 with plates up to and including 35 mm thick certified to Revision 4. Mill test certificates are produced with third party inspection to EN 10204 3.2.

S31803 / S32205 Properties Chemical Analysis (% max or range)

C
Mn
P
Si
Cr
Ni
Mo
N
0.03
2.00
0.03
0.02
1.00
21.0-23.0
4.5-6.5
2.5-3.5
0.08-0.20

S31803 / S32205 Duplex Stainless Steel

Thickness (mm)
Plate Sizes (mm)
5
12000 x 2000
6
12000 x 2000
12000 x 2500
12000 x 3000
8
12000 x 2000
12000 x 2500
12000 x 3000
10
12000 x 2000
12000 x 2500
12000 x 3000
12
12000 x 2000
12000 x 2500
12000 x 3000
15
12000 x 2000
12000 x 2500
12000 x 3000
20
12000 x 2000
12000 x 2500
12000 x 3000
25
12000 x 2000
12000 x 2500
12000 x 3000
30
6000 x 2000
5000 x 2500
35
6000 x 2000
5000 x 2500
40
6000 x 2000
5000 x 2500
45
6000 x 2000
5000 x 2500
50
6000 x 2000
5000 x 2500

 

 

S32205 Duplex Steel Sheet

Duplex U UNS S32205

A wide range of large area duplex stainless steel plates which are certified to material grades UNS S31803, UNS S32205, and 1.4462. These steels are also compatible with the branded 2205 designation. All material is produced and certified in accordance with NORSOK MDS D45 with plates up to and including 35 mm thick certified to Revision 4. Mill test certificates are produced with third party inspection to EN 10204 3.2.

S32205 Properties Chemical Analysis (% max or range)

C
Mn
P
Si
Cr
Ni
Mo
N
0.03
2.00
0.03
0.02
1.00
21.0-23.0
4.5-6.5
2.5-3.5
0.08-0.20

 

S31803 / S32205 Duplex Stainless Steel

Thickness (mm)
Plate Sizes (mm)
5
12000 x 2000
6
12000 x 2000
12000 x 2500
12000 x 3000
8
12000 x 2000
12000 x 2500
12000 x 3000
10
12000 x 2000
12000 x 2500
12000 x 3000
12
12000 x 2000
12000 x 2500
12000 x 3000
15
12000 x 2000
12000 x 2500
12000 x 3000
20
12000 x 2000
12000 x 2500
12000 x 3000
25
12000 x 2000
12000 x 2500
12000 x 3000
30
6000 x 2000
5000 x 2500
35
6000 x 2000
5000 x 2500
40
6000 x 2000
5000 x 2500
45
6000 x 2000
5000 x 2500
50
6000 x 2000
5000 x 2500

 

 

Duplex Stainless Steel Sheet 31083

Duplex UNS S31803 / UNS S32205 | 1.4462

A wide range of large area duplex stainless steel plates which are certified to material grades UNS S31803, UNS S32205, and 1.4462. These steels are also compatible with the branded 2205 designation.All material is produced and certified in accordance with NORSOK MDS D45 with plates up to and including 35 mm thick certified to Revision 4. Mill test certificates are produced with third party inspection to EN 10204 3.2.

S31803

Chemical Analysis (% max or range)

C
Mn
P
Si
Cr
Ni
Mo
N
0.03
2.00
0.03
0.02
1.00
21.0-23.0
4.5-6.5
2.5-3.5
0.08-0.20

S31803 Duplex Stainless Steel

Thickness (mm)
Plate Sizes (mm)
5
12000 x 2000
6
12000 x 2000
12000 x 2500
12000 x 3000
8
12000 x 2000
12000 x 2500
12000 x 3000
10
12000 x 2000
12000 x 2500
12000 x 3000
12
12000 x 2000
12000 x 2500
12000 x 3000
15
12000 x 2000
12000 x 2500
12000 x 3000
20
12000 x 2000
12000 x 2500
12000 x 3000
25
12000 x 2000
12000 x 2500
12000 x 3000
30
6000 x 2000
5000 x 2500
35
6000 x 2000
5000 x 2500
40
6000 x 2000
5000 x 2500
45
6000 x 2000
5000 x 2500
50
6000 x 2000
5000 x 2500