DAIKOWS 2209

SAW
  • DUPLEX - SUPERDUPLEX
2209

Description

Solid duplex stainless wire rod for welding 22% Cr ferritic-austenitic stainless steel
The deposit of this rod wire, designed for welding ferritic-austenitic duplex steels, possess, in addition to high tensile strength and toughness, also excellent resistance to stress corrosion cracking and pitting. The operating temperature range is –60 °C up to 250 °C. To ensure particularly good weld metal properties care must be taken to achieve controlled dilution and thorough back purging. It offers very high quality standards for ease of operation and good mechanical properties.
Specifications
ISO 14343-A
S 22 9 3 N L
AWS A5.9
ER2209
Shielding
DAIKOFLUX 900-W
Positions
PA, PB, PC
Current
DC/AC
Packaging Type
K415 spool and drums.
Asme qualifications
F-No (QW432)
6
A-No (QW442)
-

Ferrite

% 25-50

Pren

36.81
Chem. Comp. %
DEFAULT
C
0.01
Mn
1.45
Ni
8.6
Cr
23.2
N
0.17
P
0.015
S
0.015
Mo
3.3
Si
0.45
Cu
0.05
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
690
Yield strength Rp0.2 MPa
450
550
Elongation A (L0=5d0) %
20
36
Impact Charpy ISO-V
-
60J @ -50°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.4 mm
Ampere
250A - 420A
Voltage
28V - 32V
Packaging
Ø 2,0÷4,0mm
Packaging Type
K415 spool and drums.
2209
Description

Application

Duplex stainless steel pipes, plates, fittings, and forgings exhibit a microstructure comprising approximately equal parts of austenite and a ferrite matrix. This composition, in tandem with a general alloying level, imparts notable characteristics. These alloys exhibit high strength compared to standard austenitic steels like type 316L, ensuring robustness in various applications. Their corrosion resistance extends across diverse environments, making them well-suited for challenging conditions. Notably, they demonstrate elevated resistance to chloride-induced stress corrosion cracking (CSCC) and pitting attacks in chloride-rich environments, such as seawater. In the offshore oil/gas, chemical, and petrochemical process industries, these alloys find expanding applications, encompassing pipework systems, flowlines, risers, manifolds, and more. Additionally, the filler metal derived from these alloys is utilized for welding stainless structures requiring exceptionally high strength.

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

Preheating is typically considered unnecessary in welding processes, and adherence to a maximum interpass temperature of 150°C is recommended. The acceptable range for heat input falls within 1.0–2.5 kJ/mm, contingent on material thickness, though certain codes impose more stringent limits, often capping it at 1.75 or 2.0 kJ/mm. While welds in wrought duplex stainless steels are commonly left in the as-welded condition, substantial repairs to castings are typically specified in the solution-treated state. Experience in the field has consistently demonstrated favorable material properties when employing a treatment regimen involving exposure to 1120°C for 3-6 hours, followed by a water quenching process. In some instances, incorporating an additional cooling step to 1060°C before quenching has shown promising results in further enhancing the structural characteristics and overall performance of the welded components.

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