DAIKOWT 2594Cu

GTAW
  • DUPLEX - SUPERDUPLEX
ZERON 100

Description

Superduplex stainless steel rod for welding Zeron® 100 alloy
Superduplex rod corresponding to Zeron® 100 alloy, enriched with copper and tungsten that enhance resistance to sulfuric and hydrochloric acids compared to conventional alloys. It is ideal for offshore applications due to its high resistance to pitting and stress corrosion cracking in seawater, as well as caustic alkalis and phosphoric acid. It is widely used in the oil and gas industry.
Specifications
EN ISO 14343-A
W 25 9 4 N L
AWS A5.9
ER2594
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)
-

Ferrite

% 30-60

Pren

40.56
Chem. Comp. %
DEFAULT
C
0.02
Mn
0.6
Ni
9.1
Cr
25
N
0.23
P
0.02
S
0.015
Mo
3.6
Si
0.3
Cu
0.6
W
0.65
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
-
60J @ -50°C
Impact Charpy ISO-V
-
-
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
Description

Application

Zeron® 100 stands out for its extraordinary ability to resist corrosion and erosion in a wide range of aggressive environments. The special Cu+W combination significantly improves resistance to sulfuric and hydrochloric acids, compared to similar alloys without such additives. Thanks to its high resistance to pitting and stress corrosion cracking, Zeron® 100 is widely used in offshore applications, especially in seawater contexts. This material also offers excellent resistance to caustic alkalis and phosphoric acid. Its service temperature range generally varies between -50 °C and 280 °C, with the upper limit due to thermal instability (450 °C and sigma phase embrittlement). Zeron® 100 is highly valued in the oil and gas production sector and is used in a wide range of applications, including process piping, risers, manifolds, pressure vessels, valves, pumps, desalination plants, flue gas desulfurization (FGD) systems, and in the mining, chemical, and pharmaceutical industries. Furthermore, Zeron® 100 wires are ideal for joining supermartensitic stainless steels.

Alloy Type

25%Cr ferritic-austenitic superduplex stainless steels matching the proprietary Zeron® 100 alloy.

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.: 1.4508, 1.4501, 1.4469
  • ASTM: A890 6A, A182 F55, A890 5A
  • UNS: S32760, J93380, S32750, S32550, S32520, S39274, S32950, J93404
  • PROPRIETARY: Zeron 100 (Rolled Alloys) DP3W (Nippon Steel Corporation), 7-Mo Plus (Carpenter), SAF 2507 (Sandvik)

Welding & PWHT

For welding Zeron® 100, preheating is generally not required. The interpass temperature should not exceed 150 °C. A heat input between 1.0 and 2.0 kJ/mm (based on the material thickness) is considered optimal, though many industrial codes set a maximum limit of 1.5 or 1.75 kJ/mm. While welds in wrought duplex stainless steels are usually left as is, major repairs on castings often require a solution treatment. Field tests confirm that good properties are obtained by following a water quench treatment at 1120 °C for a period between 3 and 6 hours.

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