Ador Tiginox 2594 ER2594 Super Duplex TIG Welding Rod

Overview

Ador Tiginox 2594 is a 25/9/4 type super duplex stainless steel TIG rod manufactured by Ador Welding Limited, classified as AWS A/SFA 5.9 ER2594 and EN ISO 14343-A W 25 9 4 N L. Its austenitic-ferritic deposit is designed for a high pitting resistance equivalent number, with Ador specifying PREN 40 minimum, and it is described as offering high tensile and yield strength together with improved resistance to pitting and sulphide stress cracking in chloride environments. For root runs and complete welds on thin and medium wall super duplex pipe, a TIG rod of this type is usually the first choice of offshore and process piping fabricators.

Seven Star LLC supplies the Ador Tiginox 2594 from Muscat to oil and gas operators, desalination contractors and fabrication shops throughout Oman and the GCC. The official CE-marked product data sheet is attached to this page so that welding coordinators can confirm classification, chemistry and packing before purchase orders are raised.

Gas Tungsten Arc Welding of Super Duplex

As general welding knowledge, the corrosion performance of super duplex joints depends heavily on the root, because the inside surface of the pipe is the face in contact with seawater, brine or produced water. TIG welding gives the controlled heat input and clean shielding needed to keep the ferrite-austenite balance within limits and to avoid the formation of harmful intermetallic phases. Back purging with high-purity argon is standard practice to prevent oxidation of the root, and many specifications add nitrogen to shielding or purge gas to limit nitrogen loss from the weld.

Filler composition is the other half of the equation. The typical bare wire analysis of the Ador Tiginox 2594 is 0.02 C, 0.9 Mn, 0.45 Si, 24.3 Cr, 8.5 Ni, 3.2 Mo, 0.17 Cu and 0.30 N. The elevated nickel relative to typical base metal helps the weld form sufficient austenite as it cools, while the high nitrogen content supports both strength and pitting resistance.

Joint preparation also deserves attention with any super duplex filler. In general, fabricators use a slightly wider root opening and bevel angle than for carbon steel so that the filler can dilute properly and the weld does not end up with base-metal-like ferrite levels. Grinding discs and brushes should be dedicated to stainless work to avoid iron contamination, and post weld cleaning or pickling is often specified to restore the passive surface. When the Ador Tiginox 2594 is used for the full joint rather than only the root, procedure qualification normally includes ferrite measurement and a corrosion test such as ASTM G48, according to the client specification. Following these general practices helps the finished Ador Tiginox 2594 weld deliver the corrosion resistance that justifies a super duplex design.

Engineering Design of the Ador Tiginox 2594

The rod is supplied in straight 1000 mm lengths in diameters of 1.6 mm, 2.0 mm and 2.4 mm. Each 20 kg carton contains four plastic tubes of 5 kg, which keeps the rods clean and identifiable on the shop floor. Ador specifies DCEN polarity, all-position capability and pure argon shielding at 10 to 15 litres per minute; storage guidance is to keep the product dry during storage and handling.

The specification minimum mechanical properties for as-welded all weld metal are 760 MPa ultimate tensile strength and 15 percent elongation, alongside the PREN 40 minimum. Those values match the strength class of super duplex base metals, which is one reason the Ador Tiginox 2594 is suitable for pressure-containing pipe work where the weld must not be weaker than the parent material.

Key Features

The manufacturer data sheet for the Ador Tiginox 2594 lists the following points.

• 25/9/4 type super duplex stainless steel TIG rod with nitrogen alloying.
• Austenitic-ferritic duplex microstructure in the weld deposit.
• High PREN, specified as 40 minimum.
• Improved resistance to pitting and SSC in chloride environments.
• High tensile and yield strength, with 760 MPa minimum UTS as welded.
• Radiographic quality welds for critical piping.
• Usable in all positions on DCEN with argon shielding.
• CE approval stated on the product data sheet.

Industrial Applications

Ador names the welding of super duplex stainless steels UNS S32750, S32760, SAF 2507, Zeron 100 and casting alloys such as ASTM A890 Gr. 5A. Applications include pipe work systems, flow lines, risers and manifolds, pumps and valves, and process equipment in offshore oil and gas and petrochemical plant; Ador also notes the rod can be used on duplex 2205 grade. Within Oman, super duplex piping is found in seawater intake and cooling systems at coastal power and water plants, in high-pressure RO trains, and in produced water and injection networks on inland oil fields operated in the Sultanate.

Pump and valve repair shops are another regular user, as cast super duplex bodies and impellers sometimes need weld repair or overlay. Seven Star LLC supplies the Ador Tiginox 2594 for both fabrication and repair, and Ador offers process equivalents such as Betanox 2594 stick electrodes for situations where TIG is impractical, so a project can keep a consistent super duplex consumable family across processes.

Technical Specifications

Data below is reproduced from the official Ador Tiginox 2594 data sheet.

Related Welding Products

A versatile inverter for TIG and MMA field work is the ESAB Rebel EMP 285ic, while larger shops may prefer the Lincoln Power Wave S500. Carbon steel supports and skids can be welded with SuperArc L-59 ER70S-6. View the complete list of TIG filler rods.

Call To Action

Seven Star LLC can quote the Ador Tiginox 2594 once we know your rod diameters, the number of 20 kg cartons and the delivery address in Oman or the GCC. Download the Ador Tiginox 2594 datasheet from this page for your records, and reach our Muscat team for help matching it to your super duplex WPS and purge practice.