DAIKOSTRIP 2594

ESW, SAW
  • DUPLEX - SUPERDUPLEX
2507

Description

Nitrogen alloyed duplex strip electrode to deposit 25%Cr/10%Ni/4%Mo/N composition
It is a nitrogen alloyed duplex chromium-nickel-molybdenum strip electrode to deposit a second and third layer corrosion resistant alloy of 25%Cr/10%Ni/4%Mo/N composition on carbon- and low alloyed steels. The high corrosion resistance of overlays using this strip electrode, makes it suitable for use in aggressive environments such as chlorinated seawater and acidic, chloride containing media up to temperatures of 280°C.
Specifications
EN ISO 14343-A
B 25 9 4 N L
AWS A5.9
EQ2594
Shielding
DAIKOFLUX 940, 942AS, 944
Positions
PA
Current
DC+
Packaging Type
Coils Standard 30x05mm 60x05mm 90x05mm Weight 25 300kg width and specific weights available on request
Asme qualifications
F-No (QW432)
6
A-No (QW442)
-

Pren

42.2
Chem. Comp. %
0
C
0.02
Mn
0.4
Ni
9.5
Cr
25
N
0.25
P
0.02
S
0.015
Mo
4
Si
0.3
Cu
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
620
860
Yield strength Rp0.2 MPa
550
650
Elongation A (L0=5d0) %
18
24
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
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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