LongTeng ER70S-4 Carbon Steel Solid MIG Welding Wire

LongTeng ER70S-4 in the solid wire range

LongTeng ER70S-4 sits beside the ER70S-3 grade on page 5 of the manufacturer’s catalogue, with its own mechanical and chemical figures. It is a solid carbon steel wire for MIG/MAG welding that the manufacturer describes for low-carbon steel and thin plates and for low-carbon steel parts with thorough surface treatment. The conformance line printed for it is ISO 14341-B-GS4 and the wire designation ER70S-4.

One detail deserves honesty up front. The AWS specification line printed beside this grade in the catalogue contains a typing error, so this page quotes only the ISO designation and the grade name ER70S-4 and does not reproduce that line. If your procedure needs the AWS wording, request the batch test certificate from us and read the classification there. Seven Star LLC supplies the manufacturer’s wire from Muscat for fabrication and maintenance customers across Oman and the GCC.

Mixed-gas capability

The most visible difference between this grade and its neighbour is the reference shielding gas. For LongTeng ER70S-4 the catalogue lists CO₂ or an argon and CO₂ mixture with 5 to 20 percent carbon dioxide. General class information: argon-rich mixtures give a smoother, more stable arc with less spatter and a flatter bead than straight CO₂, which lowers clean-up time on visible joints, while pure CO₂ remains the economical choice for fast production welding.

Having both options on one datasheet is useful for shops that move between jobs. A cell welding thin structural parts can run a mixture where appearance matters, then switch to CO₂ on hidden joints without changing consumable, provided the parameters are re-verified against the welding procedure.

LongTeng ER70S-4 data from the catalogue

The values below are typical values listed by the manufacturer on the datasheet page; they are not minimum guarantees.

Typical chemical composition as printed, weight percent:

What the figures tell an engineer

Carbon is the highest of the three carbon steel grades on this spread of pages at 0.085 percent, balanced by a moderate 1.05 percent manganese and 0.718 percent silicon. Sulphur and phosphorus are both 0.014 percent, lower than the figures printed for the ER70S-3 line, and the copper figure of 0.106 percent is a residual level. Elongation of 30 percent is the highest listed among the carbon steel solid wires on the same pages.

Impact energy was recorded at minus 30 degrees Celsius with three individual results from 87 to 95 joules. If your design temperature or code requires testing at a different temperature, treat these numbers only as an indication of the wire’s behaviour and ask for the certificate of the lot you will receive.

Welding parameters by diameter

The same current and flow windows apply to the whole carbon steel solid family in this catalogue. Settings are for DC electrode positive:

General guidance: choose the lower end of each range for out-of-position or thin-section work and the upper end for flat, thick joints; confirm final settings by procedure qualification on your own material and power source.

Typical uses

Use LongTeng ER70S-4 where the catalogue points: low-carbon steel sheet and plate, and parts that have been cleaned and prepared. That includes machinery guards, support steel, storage racks, cable trays, light vessels supports and the thousands of small fabrications that keep plants and workshops in Muscat, Sohar and Duqm running.

Because it welds with either gas option, LongTeng ER70S-4 suits operators who share a gas manifold between several stations. Inverter machines of the class of the Lincoln Electric Power Wave S500 are common in such shops, and our solid welding wire category shows related items from other makers.

Packaging reference

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.

Supply and documentation

Request LongTeng ER70S-4 from Seven Star LLC by diameter and spool format. We will return a written confirmation of availability and attach the datasheet extract. No approval is claimed for this grade on this page; if a classification society or end user needs one, ask for the certificate and we will request the applicable one for your batch.

Handling and storage guidance

The following is general practice and not a manufacturer instruction. Solid carbon steel wire should stay in its packaging until it is mounted on the feeder, spools should be stored dry and away from the floor, and opened spools should be protected from dust, oil mist and grinding debris. A light rust bloom on the wire is a sign that moisture has reached it and the spool should be inspected before use.

On site, remember that gas supply matters as much as wire quality. With LongTeng ER70S-4 you can use straight CO2 or a mixture, so check that regulators, hoses and flowmeters match the chosen gas and that there is no leak between the cylinder and the torch.

Documents that go with the order

Alongside the datasheet extract on this page, the buyer of LongTeng ER70S-4 should request the test certificate of the delivered lot. It is the correct place to read the AWS wording, the actual chemistry and the impact results, and it replaces any doubt caused by the typing error in the catalogue line. Seven Star LLC passes on the certificate we receive and can relay questions about the grade to the manufacturer. Reference packages and the shielding gas option you plan to use should be stated clearly on the enquiry.

Choosing LongTeng ER70S-4 against its neighbours

Pick LongTeng ER70S-4 when you want one wire that tolerates both straight CO2 and argon mixtures on low-carbon steel, and when elongation of 30 percent and impact testing at minus 30 degrees Celsius suit the specification. Pick ER70S-6 when the steel is dirtier or the design temperature is lower, and ER70S-3 when the work is thin and the gas is plain CO2. Whichever you choose, a short trial on actual plate is the quickest way to confirm that LongTeng ER70S-4 meets the appearance and strength you need.

Where a pipe system combines welded spools with mechanical joints such as the Victaulic Style 107N QuickVic Rigid Coupling, both items can be requested together.