LongTeng E309LT1-1 Stainless Flux-Cored Welding Wire

Overview of LongTeng E309LT1-1 for Dissimilar and Buffer Welds

Joining carbon steel to stainless steel is one of the hardest everyday jobs in a process plant, because the two metals expand differently and the weld metal mixes with both. The usual answer is an overalloyed filler, and the 309L family exists for this purpose. LongTeng E309LT1-1 is the catalogue entry of Jiangsu Longteng Special Steel Group for a carbon dioxide shielded stainless flux-cored wire that the manufacturer lists under AWS A5.22 as E309LT1-1. The printed chemistry carries 23.82 percent chromium and 12.39 percent nickel, a much richer analysis than the 308L wire for plain stainless joints.

Seven Star LLC supplies LongTeng E309LT1-1 to fabricators and maintenance contractors in Oman and the GCC, with engineering support from Muscat. The general application line in the catalogue is not specific to this grade, so this page does not rely on it. Instead it describes the grade through its AWS class, as general information, and through the chemistry printed in the table.

What a 309L Deposit Does

This section is general class information and not a LongTeng guarantee. When a 308L filler is run onto carbon steel, iron from the base metal dilutes the deposit and drops the chromium and nickel below the level needed for a stable austenitic structure, so brittle martensite can form. A 309L filler starts with extra chromium and nickel, so even after dilution the first layer remains austenitic with a small amount of ferrite. The same property makes the class common for a buffer or first layer under 308L, 316L or higher-alloy overlays, and for welding stainless steel to mild or low-alloy steel.

The designation E309LT1-1 can be read as follows. E for electrode, 309L for the deposit composition with low carbon, T for tubular wire, the first 1 for all-position capability and the second 1 for classification with carbon dioxide shielding gas. The catalogue lists only carbon dioxide for LongTeng E309LT1-1, at 20 to 25 litres per minute.

Printed Analysis of LongTeng E309LT1-1

The listed chemical composition is carbon 0.021 percent, manganese 1.68, silicon 0.58, sulphur 0.003, phosphorus 0.018, nickel 12.39, chromium 23.82, molybdenum 0.08 and copper 0.07. Low carbon at 0.021 percent limits carbide precipitation, and the chromium to nickel ratio is in the range associated with ferrite-bearing austenitic weld metal that resists hot cracking. With sulphur at 0.003 percent, the deposit should be clean. A buyer who needs a ferrite number for a specification should ask for the measured value in the test certificate.

Mechanical Data and an Honest Caveat

The catalogue mechanical row for this grade shows a tensile strength of 545 MPa. The same row also prints yield strength, elongation and impact figures, but these could not be verified as specific to this grade. For that reason this page publishes only the 545 MPa tensile value as listed, and it leaves out yield, elongation and impact energy. Request the actual mechanical results from the test certificate of the lot you intend to buy.

Current, Diameter and Gas Settings

The reference table gives two diameters, 1.2 mm at 160 to 240 A and 1.6 mm at 180 to 270 A, both with DC electrode positive and carbon dioxide shielding. Stainless wires need moderate heat input, as stainless steel conducts heat poorly and distorts easily. On a dissimilar joint, keep the arc on the stainless side or centred in the root according to the approved procedure so that dilution stays controlled.

Strengths You Can Check in the Data

• Chromium at 23.82 percent and nickel at 12.39 percent are the overalloyed values expected from a 309L-type wire.
• Carbon of only 0.021 percent keeps the grade in the low-carbon L family.
• The AWS A5.22 listing places the wire in the specification used for stainless tubular wires.
• Carbon dioxide shielding is the single gas listed, so shop supply is straightforward.
• Two sizes, 1.2 mm and 1.6 mm, cover medium and heavier sections.
• The listed phosphorus of 0.018 percent and sulphur of 0.003 percent are modest.
• Only verified values are printed on this page, while doubtful catalogue lines are left out and referred to the certificate.

Applications in Oman and the GCC

Gulf industry combines carbon steel structures with stainless equipment at many interfaces. Examples include stainless nozzles welded to carbon steel vessels, clad plate repairs, stainless lining and weld overlay preparation, desalination and water treatment skids, heat exchangers and process piping tie-ins. Fabricators in Sohar, Duqm, Salalah and the Muscat industrial zones meet such joints regularly, and flux-cored 309L wire gives a productive route. Whether LongTeng E309LT1-1 is right for a specific joint depends on the base metals, the service temperature and the project specification, which must be confirmed by a welding engineer.

Seven Star LLC will answer grade and document questions about LongTeng E309LT1-1. When you enquire, give both base metal grades, thickness, position and the certificate wording you require. No approval from a classification society or other body is claimed on this page.

Technical Specifications of LongTeng E309LT1-1

The following typical values are listed by the manufacturer for LongTeng E309LT1-1, with doubtful mechanical entries omitted.

Supporting Equipment

Dissimilar joints need careful heat control and dependable wire feeding. Options from Seven Star LLC include the ESAB Rebel EMP 285ic, the high-capacity Lincoln Electric Power Wave S500, and the FLIR E96 for thermal checks on nozzle and buffer-layer welds.

How to Order

Send Seven Star LLC the diameter, quantity and delivery location for LongTeng E309LT1-1. Our team in Muscat will reply with availability and the lot documents, and the attached catalogue extract serves as the LongTeng E309LT1-1 datasheet for your engineers. A formal request for quotation can follow once the grade, certificate wording and joint design are agreed for your project in Oman or the GCC.