LongTeng ER70S-6 Carbon Steel Solid MIG Welding Wire

LongTeng ER70S-6 structural steel solid wire

LongTeng ER70S-6 is the workhorse entry on page 6 of the manufacturer’s catalogue. The datasheet describes it for welding all kinds of 500 MPa structural steel parts, and for 500 MPa plates and pipes, and lists the conformance as AWS A5.18 ER70S-6. The catalogue also prints an ISO designation on this page, but the string looks garbled, so we do not repeat it here and rely on the AWS class and the batch test certificate instead.

Compared with the ER70S-3 and ER70S-4 entries, this wire carries more manganese and silicon, and it reports impact values at minus 40 degrees Celsius instead of minus 20 or minus 30. Seven Star LLC supplies it from Muscat to structural fabricators, pipe-spool shops and maintenance contractors working in Oman and the GCC.

Why the 6 grade is the common choice

General class information: the ER70S-6 chemistry carries the highest level of deoxidisers in the AWS A5.18 carbon steel series. Extra manganese and silicon allow the weld pool to cope better with light mill scale or rust films, and they give a smooth-wetting bead on joints that cannot be cleaned perfectly. That is why this grade tends to be stocked by default in shops that weld mixed steel from several mills.

The trade-off is slightly more silica islands on the bead surface in multipass welding, which should be brushed between runs, and a marginally higher hardness in the weld metal than a lower-silicon wire would give. Neither is a defect, but both are good reasons to qualify the procedure on your own plate.

LongTeng ER70S-6 datasheet values

All figures are typical values listed by the manufacturer for this grade.

Typical chemical composition as printed, weight percent:

Interpreting the chemistry and impact figures

Silicon of 0.87 percent and manganese of 1.45 percent are the signature of this class, and the low sulphur and phosphorus figures of 0.013 and 0.012 percent support clean weld metal. The 0.125 percent copper value is the residual level in the wire analysis and should not be confused with the copper surface coating of the spool wire.

The three impact results of 77, 95 and 83 joules at minus 40 degrees Celsius are the lowest-temperature results among the plain carbon steel wires on pages 5 to 7. They are typical values, so a project that specifies a minimum average must be backed by the certificate for the delivered lot.

Gas choice and parameters

The catalogue gives two reference gases for LongTeng ER70S-6: 100 percent CO₂ and an 80 percent argon with 20 percent CO₂ blend. Flow rate and current by diameter are listed for DC electrode positive:

General guidance: the 80/20 blend favours spray-like transfer at higher currents and a flatter bead, while pure CO₂ gives deeper penetration with more spatter. Pick the gas to match the thickness, position and appearance requirement of the joint, then lock it into the procedure.

Applications

The catalogue application notes for LongTeng ER70S-6 focus on 500 MPa structural steel parts, plates and pipes. Typical regional jobs of that kind include structural steel for process plants, pipe racks and supports, pressure-vessel skirts and attachments, tank fabrication and shipyard secondary steel, always subject to the code and procedure that govern the job.

A 1.2 mm wire at 80 to 350 A is a common production setting on equipment of the class of the ESAB Rebel EMP 285ic, while 0.8 and 1.0 mm diameters suit lighter work. Look at our solid welding wire listings for sibling grades when the design calls for lower or higher strength.

Packaging and ordering

The manufacturer’s package reference lists GMAW spools to EN ISO 544 in several formats: BS300 (steel, 15 kg), D270 (plastic, 15 kg), D300 (plastic, 15 kg), D200 (plastic, 5 kg) and D100 (plastic, 1 kg), each in corrugated cardboard outer packing. These are the manufacturer’s reference packages, not a statement of what is on our shelves; confirm the spool format and quantity you need when you send the enquiry.

Tell us the diameter, spool format and quantity of LongTeng ER70S-6 you need, along with the delivery location in Oman or the wider GCC, and we will reply with a written confirmation. The catalogue approval certificates are held by specific entities for specific grades; none is claimed on this page, and we recommend requesting the test certificate of the lot for any inspected work.

Practical welding notes

General class information: keep the welding parameters inside the windows listed for the diameter, and treat the first runs on a new lot as a verification step. On structural joints, interpass cleaning removes the thin silicate layer that forms on the bead, which helps avoid inclusions in multipass welds. Using the correct stick-out, typically stated in the power source manual, keeps the current within the range printed above.

Wire storage follows the usual rules for LongTeng ER70S-6 and any copper-coated wire: dry room, sealed packaging, no direct contact with the floor, and removal of the spool from the feeder when the machine is idle for long periods in humid conditions.

Specifying LongTeng ER70S-6 in your procedure

Write the AWS class ER70S-6 and the shielding gas into the welding procedure specification, then record the manufacturer, the diameter and the lot number. When an inspector asks for evidence, the datasheet extract on this page and the batch certificate together show what the wire is. Seven Star LLC can help assemble that paperwork for Oman and GCC projects, but the qualification of the procedure itself remains the responsibility of the welding contractor and its inspection body.

Choosing LongTeng ER70S-6 against its neighbours

If the job involves 500 MPa structural plate, pipes and mixed-quality steel, LongTeng ER70S-6 is the entry in this group aimed squarely at it. For thin, clean sheet, the ER70S-3 line is the lighter option, while the G-class grades on the following page suit high-speed production. For a feeding-sensitive or mechanised cell, review the copper free version that sits directly beneath LongTeng ER70S-6 on the same datasheet page and compare it with the plated wire in a short trial.

Pipe-spool jobs that finish with grooved connections like the Victaulic Style 107N QuickVic Rigid Coupling can be quoted alongside the wire.