DAIKOWT 2594

GTAW
  • DUPLEX - SUPERDUPLEX
2507

Description

Superduplex stainless steel rod for welding 25% Cr ferritic-austenitic stainless steel
Rod developed for welding superduplex ferritic-austenitic steels, with high tensile strength and toughness, excellent resistance to stress corrosion, pitting, and intergranular corrosion. The service temperature ranges from -50°C to 250°C. For optimal performance, controlled dilution and thorough purging are essential. It offers excellent mechanical properties and ease of use.
Specifications
EN ISO 14343-A
W 25 9 4 N L
AWS A5.9
ER2594
Certifications
CE, TUV
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Asme qualifications
F-No (QW432)
6
A-No (QW442)
-

Pren

42.2

Hardness

290HV - 310HV
Chem. Comp. %
DEFAULT
C
0.01
Mn
0.55
Ni
9.3
Cr
25
N
0.25
P
0.02
S
0.015
Mo
4
Si
0.4
Cu
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
620
870
Yield strength Rp0.2 MPa
550
670
Elongation A (L0=5d0) %
18
24
Impact Charpy ISO-V
-
130J @ -50°C
Impact Charpy ISO-V
-
100J @ -75°C
Welding Parameters
1.6 mm
2.4 mm
Ampere
80A - 100A
110A - 160A
Voltage
-
-
Packaging
Ø 1,0÷4,0mm
Ø 1,0÷4,0mm
Packaging Type
5kg carton tube
5kg carton tube
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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