CHARACTERISTICS & APPLICATIONS
íshín-309LR has nominal composition (wt. %) of weld metal 23.5 Cr, 13 Ni which is same as that deposited by E309 electrodes, except for the lower carbon content. The 0.04 percent maximum carbon content of these weld deposits ensures higher ferrite content than the E309H, usually greater than 8 FN and reduces the possibility of intergranular carbide precipitation. This thereby increases the resistance to intergranular corrosion without the use of niobium (columbium). E309L deposits are not as strong at elevated temperature as the niobium-stabilized alloy or E309H deposits. E309L electrodes are commonly used for welding dissimilar steels, such as joining Type 304 to mild or low-alloy steel, welding the clad side of Type 304-clad steels, welding the first layer of E308L weld cladding, and applying stainless steel sheet linings to carbon steel. Embrittlement or cracking can occur if these dissimilar steel welds are subjected to a post weld heat treatment or to service above 370°C. If post weld heat treatment of the carbon steel is essential, the total procedure, welding and heat treatment should be proven prior to implementation.
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 | 22.0-25.0 | 12.0-14.0 | 0.75 | NS | 0.5-2.5 | 1.00 | 0.04 | 0.03 | NS | 0.75 | 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 |
| 520 | NS | 30 | 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.