LongTeng ER316L Stainless Steel Solid MIG Welding Wire

LongTeng ER316L Molybdenum-Alloyed Stainless MIG Wire

LongTeng ER316L is the molybdenum-bearing stainless member of the Longteng solid wire range, cited by the manufacturer against AWS A5.9 ER316L. The catalogue states that it is applied in petrochemical and chemical fertilizer equipment, including welding of SUS316L and other materials. Where a 308L filler is adequate for general austenitic work, LongTeng ER316L is chosen when the service fluid contains chlorides or reducing acids, because molybdenum improves resistance to pitting and crevice attack. Seawater, brine and process streams in the Gulf are typical examples.

Seven Star LLC supplies LongTeng consumables from Muscat to customers in Oman and across the GCC. This page lays out what the manufacturer has printed for LongTeng ER316L, explains how to interpret it and clarifies one important point: the mechanical property row shown on the catalogue page for this grade is a duplicate of a carbon steel wire row and is not suitable for stainless steel, so it is withheld here. Request the batch test certificate for mechanical values.

The Role of Molybdenum

The typical analysis for LongTeng ER316L lists molybdenum at 2.59 percent, chromium at 19.12 percent and nickel at 12.59 percent. In general class terms, 316L fillers are designed to contain roughly 2 to 3 percent molybdenum, and the printed figure falls in that region. Compared with a 308L wire, the nickel is higher to keep the weld structure austenitic in the presence of extra molybdenum, and the chromium is slightly lower. The deposit is therefore better prepared for chloride-bearing services, though the actual corrosion performance of a welded joint also depends on heat tint removal, surface finish and design.

Carbon is shown at 0.023 percent, a low value in line with the L designation, which limits sensitisation in the heat-affected zone. Manganese is 1.90 percent and silicon 0.42 percent; these elements support deoxidation and wetting. Phosphorus at 0.009 percent and sulphur at 0.008 percent are low, and copper is 0.28 percent. All are typical values listed by the manufacturer rather than guaranteed limits, so for regulated equipment ask for the heat analysis in the test certificate.

Operating Window from the Catalogue

For LongTeng ER316L the catalogue gives argon plus 20 percent carbon dioxide at 20 to 25 L/min, direct current electrode positive, and three diameters: 0.8, 1.0 and 1.2 mm. Reference current ranges are 70 to 150 A for 0.8 mm, 100 to 200 A for 1.0 mm and 140 to 220 A for 1.2 mm. Many stainless procedures specify a gas with a smaller carbon dioxide share to reduce carbon pickup, so treat the catalogue figure as manufacturer reference and align the final gas choice with your qualified procedure.

The packaging pages show reference spool formats that also apply to LongTeng ER316L for gas-shielded wire from 1 kg to 15 kg in corrugated cardboard. They illustrate formats the producer uses and are not a statement that a particular size is on a shelf in Oman. Ask our team which package can be arranged for your required diameter.

Advantages Worth Noting

Here is what the datasheet and standard class knowledge say about LongTeng ER316L.

• It is listed to AWS A5.9 ER316L, the common bare wire classification for 316L filler metal.
• Molybdenum of 2.59 percent in the typical analysis supports pitting resistance in chloride environments.
• Nickel of 12.59 percent helps maintain a stable austenitic structure.
• Low carbon of 0.023 percent reduces the risk of carbide precipitation in service.
• Phosphorus and sulphur are both below 0.01 percent in the printed analysis.
• Diameters of 0.8, 1.0 and 1.2 mm cover sheet and medium plate fabrication.
• Reference currents from 70 to 220 A suit standard MIG power sources.

Applications for Petrochemical and Fertilizer Plant

The manufacturer points to petrochemical and chemical fertilizer equipment, and it mentions SUS316L base metal explicitly. In Oman and the GCC, the same steel appears in heat exchangers, reactor internals, storage tanks for chemicals, desalination components, dosing skids and pharmaceutical or food utility piping. A matching filler is important because under-alloyed weld metal can corrode faster than the surrounding plate, which is exactly the risk LongTeng ER316L is meant to avoid when the parent metal contains molybdenum.

Fabrication quality depends on cleanliness and heat control. Use stainless-only tools, remove oxide tint after welding, and control interpass temperature so that the joint stays within the process limits. For the welding power source, the Lincoln Electric Power Wave S500 and the ESAB Rebel EMP 285ic are multi-process machines in our range, and hardness spot checks on welded assemblies can be made with the Phase II PHT-3500 portable hardness tester where the inspection plan calls for it.

Technical Specifications

The table below carries the chemistry, gas and current data printed for LongTeng ER316L. Mechanical values are not listed, since the catalogue row looks copied from another grade; refer to the batch certificate. The datasheet extract is attached to this page.

Choosing Between 316L and 308L

Select LongTeng ER316L by service environment. If the process fluid or atmosphere is mildly corrosive and the base steel is 304 or 304L, a 308L wire is typically sufficient. If the steel is 316 or 316L, or if chlorides, acids or sea air are present, a molybdenum-alloyed filler is the safer match. Never mix fillers casually on a single vessel: record the filler, the heat or lot, and the gas used so the documentation follows the equipment.

Storage and Feeding Tips

Keep spools of LongTeng ER316L sealed and dry, away from carbon steel grinding dust and from contact with the floor. Load the wire with clean gloves, choose a liner that suits stainless wire, and keep the contact tip free of spatter so the feed stays smooth. Surface contamination on the wire shows up later as porosity and discoloured beads, and cleaning the finished weld cannot fully correct it. Allow cold spools to warm to workshop temperature before unwrapping them in humid weather.

How to Order

To request a quotation for LongTeng ER316L, send Seven Star LLC the diameter, quantity and delivery point you need in Oman or the GCC. Our Muscat team will confirm package format, send the datasheet extract and remind you to ask for the batch test certificate, which carries the mechanical results for your project quality file.