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
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 30x0,5mm, 60x0,5mm, 90x0,5mm, 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

Superduplex stainless steel pipes, plates, fittings, and forgings exhibit a microstructure comprising approximately equal parts of austenite and a ferrite matrix. This unique composition, in conjunction with a general alloying level, imparts notable characteristics: Superduplex exhibits high strength in comparison to standard austenitic steels like type 316L. Its robustness extends to good general corrosion resistance across diverse environments. Additionally, the alloy demonstrates exceptional resistance to chloride-induced stress corrosion cracking (CSCC) and pitting attacks in chloride-rich environments, such as seawater. In scenarios involving dilute sulfuric acid contaminated with chloride ions, 2507 outperforms 904L—a highly alloyed austenitic steel designed for pure sulfuric acid resistance. These alloys are increasingly finding broader applications in the offshore oil/gas, chemical, and petrochemical process industries. Their versatile use encompasses pipework systems, flowlines, risers, manifolds, and other critical components.

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

Preheating is typically deemed unnecessary, with stringent control over the interpass temperature, capped at 150°C. While a heat input ranging between 1.0 and 2.0 kJ/mm (depending on material thickness) is generally deemed acceptable, it's worth noting that numerous codes impose a stricter maximum limit, often restricting it to 1.5 or 1.75 kJ/mm. Notably, welds in wrought duplex stainless steels are customarily left in the as-welded condition. However, for substantial repairs to castings, specifications often recommend adopting the solution-treated condition. Drawing from accumulated experience, it has been observed that desirable material properties can be attained through a treatment regimen involving exposure to 1120°C for a duration of 3-6 hours, followed by a water quenching process. This established procedure has demonstrated positive outcomes in enhancing the structural characteristics and overall performance of the welded components.

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