DAIKOFCW 2594P

FCAW
  • DUPLEX - SUPERDUPLEX
2507

Description

Rutile all position flux cored wire for 25% Cr superduplex ferritic-austenitic stainless steels
Rutile flux cored wire for welding and cladding in all positions thanks to the fast-freezing slag. The deposit of this rod wire, designed for welding ferritic-austenitic superduplex steels, possess, in addition to high tensile strength and toughness, also excellent resistance to stress corrosion cracking, pitting and to inter-crystalline corrosion. The operating temperature range is –50 °C up to 250 °C. It offers excellent weldability, easy handling and slag control in all positions resulting in high productivity with outstanding welding performance.
Specifications
EN ISO 17633-A
T 25 9 4 N L P C1/M21 1
AWS A5.22
E2594T1-1/4
Certifications
CE
Shielding
M21, C1
Positions
PA, PB, PC, PD, PE, PF, PG
Current
DC+
Packaging Type
BS300 spool
Asme qualifications
F-No (QW432)
6
A-No (QW442)
-

Pren

43.1
Chem. Comp. %
DEFAULT
C
0.03
Mn
1.2
Ni
9.7
Cr
25.9
N
0.25
P
0.02
S
0.005
Mo
4
Si
0.5
Mechanical Properties
min
variant
Tensile strength Rm MPa
620
900
Yield strength Rp0.2 MPa
550
700
Elongation A (L0=5d0) %
18
27
Impact Charpy ISO-V
-
40J @ -50°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.2 mm
1.6 mm
Ampere
120A - 240A
200A - 350A
Voltage
20V - 28V
28V - 32V
Packaging
Ø 1,2÷1,6mm
Ø 1,2÷1,6mm
Packaging Type
BS300 spool
BS300 spool
2507
Description

Application

Super duplex stainless steel pipes, plates, fittings, and forgings have a microstructure composed of approximately 50% austenite and 50% ferrite matrix. This combination, along with the alloy composition, offers several key benefits: - high strength compared to standard austenitic steels like type 316L; - excellent overall corrosion resistance in a wide range of environments; - high resistance to chloride-induced stress corrosion cracking (CSCC); - remarkable resistance to pitting attack in environments containing chlorides, such as seawater. These characteristics make super duplex alloys ideal for continuously evolving applications in the
offshore oil/gas, chemical, and petrochemical industry. They are frequently used in piping systems, flow lines, risers, manifolds, and more.

Alloy Type

25%Cr ferritic-austenitic superduplex stainless steels.

Microstructure

Austenite-ferrite duplex microstructure in AW or solution annealed condition with an approximate 30- 60% ferrite level, depending on heat cycle conditions.

Materials

  • EN W.Nr.: 1.4410 (X2CrNiMoN25-7-4)
  • ASTM: A182 F53, A182 F55, A890 Gr5A, A890 Gr6A
  • UNS: S32750, S32760, J93404
  • PROPRIETARY: SAF 2507 (Sandvik), Uranus® 47N (Industeel)

Welding & PWHT

Generally, preheating is not required. The interpass temperature is set to a maximum of 150 °C. A heat input range of 1.0–2.0 kJ/mm, depending on the thickness of the material, is acceptable, with many codes specifying a maximum limit of 1.5 or 1.75 kJ/mm. Although welds on duplex stainless steels are almost always left as-welded, major repairs on castings are generally carried out in a solution-treated condition. Industry practices suggest that excellent mechanical properties can be obtained through water quenching at 1120 °C, held for 3-6 hours.

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