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UNS S31803

UNS S31803 is a typical duplex stainless steel very similar to UNS S32205 except that it may have a bit lower content requirement of chromium, molybdenum and nitrogen. Generally, both UNS 31803 and S32205 can be called as “Duplex 2205” in practice.

ASTM A789 UNS S31803 seamless pipes, 33mm x 1mm.

ASTM A789 UNS S31803 seamless pipes, 33mm x 1mm.

1. Chemical Composition of UNS S31803

The Chemical Composition of S31803, %
Carbon0-0.03
Chromium21.00-23.00
Manganese≤2.00
Silicon≤1.00
Phosphorous0-0.03
Sulphur0-0.02
Nickel4.50-6.50
Nitrogen0.08-0.20
Molybdenum2.50-3.50
IronBalance

2. Mechanical Properties of UNS S31803

Tensile Strength,min.Yield Strength,min.Elongation,min.Hardness Brinell, max
MpaMpa%HB
62045025290

3. Physical Properties of UNS S31803

A floating ball valve with ASTM A182 F51 body.

A floating ball valve with ASTM A182 F51 body.

DensityThermal ExpansionModulus of ElasticityThermal ConductivityElectrical Resistivity
g/cm3KGpaW/m.kΩ.m
7.80513.7*10-620019.00.085*10-6

4. Product Forms and Standards

Duplex stainless steel UNS S31803 can be supplied in the following forms:

  1. Plates, sheets & strips: ASTM A240;
  2. Bars and shapes: ASTM A276, A479;
  3. Seamless and weld pipe/ tubes: ASTM A789, A790, A928;
  4. Wrought duplex pipe fittings: ASTM A815;
  5. Forgings(flanges, fittings, valve parts): ASTM A182, ASTM A988.

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Duplex Stainless Steel

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