CHARACTERISTICS & APPLICATIONS
íshín-2593R deposits weld metal containing 25 Cr, 9.5 Ni, 3.4 Mo, 2.5 Cu, and 0.2 N. These electrodes are used primarily to weld duplex stainless steels which contain approximately 25 percent chromium. Weld metal deposited by these electrodes has a “duplex” microstructure consisting of an austenite-ferrite matrix. Weld metal deposited by E2593 electrodes combines increased tensile strength with improved resistance to pitting corrosive attack and to stress corrosion cracking. If post weld annealing is required, this weld metal will require a higher annealing temperature than that required by the E2553 classification or the duplex base metal.
The covering for these electrodes generally contains readily ionizing elements to stabilize the arc for welding with alternating current. Electrode sizes 4.0 mm and smaller may be used in all positions of welding.
Storage and Drying Conditions: Hydrogen can have adverse effects on welds in some steels under certain conditions. One source of this hydrogen is moisture in the electrode coverings. For this reason, the proper storage, treatment, and handling of electrodes are necessary.
Holding Ovens: 125°C–150°C.
Drying Conditions: 250°C–425°C for 1 hour prior to use.
CHEMICAL COMPOSITION OF UNDILUTED WELD
| C | Cr | Ni | Mo | Nb+Ta | Mn | Si | P | S | N | Cu | Others |
| 0.04 | 24.0-27.0 | 8.50-10.50 | 2.90-3.90 | NS | 0.50-1.50 | 1.00 | 0.04 | 0.03 | 0.08-0.25 | 1.50-3.00 | NS |
Single values are maxima, except where specified otherwise.
ALL-WELD-METAL MECHANICAL PROPERTIES
| Tensile Strength, MPa | Yield Strength, At 0.2% Offset, MPa | Elongation % | Lateral Expansion, mm | Charpy V-Notch Impact at NS°C, Joules |
| 760 | NS | 15 | NS | NS |
Single values are minimal.
ELECTRODE SIZE & WELDING CURRENT (AC and DCEP)
| DIAMETER, mm | LENGTH, mm | Amperes |
| 2.50 | 350 | 65-90 |
| 3.15, 3.20 | 350 | 90-120 |
| 4.00 | 350 | 120-150 |
| 5.00 | 350 | 160-200 |
WARNING: Safety and health information is available from many sources, including, but not limited to Safety and Health Fact Sheets listed in A11.3, ANSI Z49.1 Safety in Welding, Cutting, and Allied Processes published by the American Welding Society, 8669 Doral Blvd., Suite 130, Doral, FL 33166., and applicable federal and state regulations. The Safety and Health Fact Sheets are revised, and additional sheets added periodically.