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Duplex S31803/F51

Material: Duplex 2205, Grade S31083, DIN 1.4462, F51
Type: Pipes
          Plates
          Bars
          Fittings
          Forgings
          Flanges
          Prefabrication
Availability:
Duplex S31803 Features:

The alloy consists of around 40-50% ferrite in the annealed condition.  It has superior resistance to chloride pitting and crevice corrosion as compared to 317L stainless steel. The alloy has outstanding corrosion resistance to seawater and most concentrations of sulphuric acid. In addition, it is also resistant to sulphide stress corrosion cracking (sour-gas environments).


Duplex stainlesss steel S31803 Chemical Composition, %

Carbon (C)

0.0 - 0.03

Chromium (Cr)

21.00 - 23.00

Manganese (Mn)

2.00 max

Silicon (Si)

1.00 max

Phosphorous (P)

0.0 - 0.03

Sulphur (S)

0.0 - 0.02

Nickel (Ni)

4.50 - 6.50

Nitrogen (N)

0.08 - 0.20

Molybdenum (Mo)

2.50 - 3.50

Iron (Fe)

Balance


Duplex stainlesss steel S31803 Mechanical Properties

Mechanical properties

Tensile, min, ksi[MPa]

Yield, min, ksi[MPa]

Elongation, %(min)

Hardness, HB(max)

S31803

90 [620]

65 [450]

25

290


Duplex stainlesss steel S31803 Equivalent Grades

STANDARD

WERKSTOFF NR.

UNS

EN

Duplex S31803

1.4462

S31803

X2CrNiMoN22-5-3


Duplex stainless steel S31803 ASTM Specifications

Pipe
SMLS& Welded

Tube
SMLS& Welded

Sheet/Plate

Bar /Rod

Forging /Flange

BW Fittings

ASTM A790

ASTM A789

ASTM A240

ASTM A276/A479

ASTM A182

ASTM A815


Corrosion Resistance:
Duplex stainless steels are extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulphide environments, duplex stainless steels exhibit very high resistance to stress corrosion cracking. While the super duplex grades are even more resistant to corrosion.

Heat Resistance:
The high chromium content of duplex stainless steels that protects against corrosion, causes embrittlement at temperatures over about 300°C.  At low temperatures duplex stainless steels have better ductility than the ferritic and martensitic grades. Duplex grades can readily  be used down to at least -50°C.

Heat Treatment:
The solution treatment temperature is 1040-1100°C, and it must be quenched after heat treatment. The cooling rate should be as fast as possible, and the time of exposure to the brittle temperature range (475°C brittle temperature range, σ brittle temperature range) must be shortened.

Pickling:
Pickling uses a mixture of nitric and hydrofluoric acids. Since the scale of S31803 is slightly more difficult to remove compared to SUS 304, it may be more effective to perform a short alkali immersion before pickling or, if possible, shot peening.


Duplex stainless steel S31803 Application:

  • Seawater systems

  • Oil field piping

  • Chemical process vessels, piping, and heat exchangers

  • FGD scrubber systems

  • Pulp mill digesters, bleach washers

  • Food process equipment


JN Alloy Products

JN Alloy is a distributor and product manufacturer of stainless steel, duplex steel, and nickel.
Tel: +86 19339900211
Add: Stainless steel Market 289, Xinwu District , Wuxi, China
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