G-TECH 2209B

SMAW
  • DUPLEX - SUPERDUPLEX
2209

Description

Rutile-basic coated electrode for Duplex 22%Cr stainless steels
These alloys are finding widening application in the offshore oil/gas, chemical and petro-chemical process industries for their good resistance to stress corrosion cracking and pitting corrosion with typical pitting resistance equivalent number (PREN) of 35-36. The weld metal poses a high tensile and yield strength. Its basic coating ensures excellent positional welding characteristics with good gap bridging ability.
Specifications
EN ISO 3581-A
E 22 9 3 N L B 42
AWS A5.4
E2209-15
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
DC+;
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
5
A-No (QW442)
-

Ferrite

% 25-50

Pren

36.28
Chem. Comp. %
DEFAULT
C
0.035
Mn
1.5
Ni
9.2
Cr
23
N
0.17
P
0.02
S
0.01
Mo
3.2
Si
0.7
Cu
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
690
Yield strength Rp0.2 MPa
450
550
Elongation A (L0=5d0) %
20
28
Impact Charpy ISO-V
-
80J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4.0 mm
Ampere
50A - 80A
70A - 110A
100A - 160A
Voltage
-
-
-
Packaging
56 pcs/kg
30 pcs/kg
19 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
2209
Description

Application

The 2209 subfamily is used in pipes, plates, fittings, and forgings made from duplex stainless steel. This type of steel has a microstructure composed of about 50% austenite with a ferritic matrix. This composition, together with the general level of alloying, ensures superior strength compared to conventional austenitic steels, such as type 316L. It also offers excellent corrosion resistance in a wide range of environments, along with notable resistance to chloride-induced stress corrosion cracking (CSCC) and pitting attack in chlorinated environments, such as seawater. These characteristics make the alloys particularly appreciated in offshore applications in the oil, gas, chemical, and petrochemical sectors, including piping systems, flow lines, risers, and manifolds.

Alloy Type

22%Cr standard ferritic-austenitic duplex stainless steels.

Microstructure

Multipass welds in the as-welded condition contain about 25–50% ferrite depending on dilution and heat input/cooling rate conditions.

Materials

  • EN W.Nr.: 1.4462 (X2CrNiMoN22-5-3), 1.4362 (X2CrNiN23-4)
  • ASTM: A182 Gr F51, A890 Gr 4A (cast)
  • UNS: S31803, S32205, S32101, S32304, S32001, J92205
  • PROPRIETARY: SAF2205, SAF 2304 (Sandvik), Uranus® 45N, 35N (Industeel), A903 (voestalpine), Cronifer 2205LCN (VDM), Maresist F51 (Schmidt + Clemens), SM22Cr (Nippon Steel Corporation), LDX 2101 (Outokumpu)

Welding & PWHT

Generally, preheating is not necessary for welding. It is advisable to maintain a maximum interpass temperature of 150 °C. The heat input should be between 1.0 and 2.5 kJ/mm, depending on the material thickness; however, some codes limit the value to a maximum of 1.75 or 2.0 kJ/mm. Although welds on duplex stainless steels are almost always left as-welded, solution treatment is generally required for major repairs on castings. Studies and experience have shown that a water quench treatment at 1120 °C for 3-6 hours, with or without a cooling step at 1060 °C before quenching, imparts excellent metallurgical properties.

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