LongTeng ER90S-G Carbon Steel Solid MIG Welding Wire

Overview of LongTeng ER90S-G Carbon Steel Solid MIG Welding Wire

LongTeng ER90S-G is a copper-coated solid wire for gas-shielded arc welding of high-strength structural steel. The manufacturer, Jiangsu Longteng Special Steel Group, lists it under the AWS A5.28 designation ER90S-G and positions it for 620 MPa class steels used in construction machinery, pipelines, ships and pressure vessels. Within AWS A5.28 the letter G means the class does not fix a single chemical window, so the chemistry printed by the producer becomes the working reference for procedure writers. This page reproduces the LongTeng ER90S-G figures from the manufacturer catalogue datasheet so that an engineer can check the wire against a welding procedure before asking for a quotation.

Seven Star LLC supplies LongTeng welding consumables to buyers in Muscat, the Sultanate of Oman and the wider GCC, with supply coordination and engineering support. If your fabrication shop, pipe-spool contractor or maintenance team needs a low-alloy MIG wire in the 620 MPa strength class, the table below shows what the catalogue actually states, and the sections after it explain how to read those numbers. All mechanical and chemical values are typical values listed by the manufacturer, not Seven Star LLC guarantees, and a batch test certificate remains the document of record.

How the Wire Behaves in the Arc

In gas metal arc welding the wire is fed continuously through a contact tip while an arc melts it into the joint. The catalogue gives a shielding gas of argon plus carbon dioxide for LongTeng ER90S-G and recommends direct current electrode positive. An argon rich mixture with carbon dioxide gives a stable spray or short-circuit transfer, keeps spatter moderate and supplies a mildly oxidising atmosphere that works with the silicon and manganese in the wire to deoxidise the weld pool. Silicon in this wire is listed at 0.50 to 0.95 percent and manganese at 1.40 to 1.90 percent, which is a typical balance for sound, pore-free beads on rimmed or lightly scaled plate.

In LongTeng ER90S-G the molybdenum content of 0.20 to 0.60 percent is the element that separates this wire from plain ER70S-6 types. Molybdenum raises strength through solid solution and promotes a finer weld microstructure, which is why wires of this kind are chosen when the base metal is a quenched and tempered or thermo-mechanically rolled plate. Titanium is capped at 0.12 percent and copper, including the thin surface coating, at 0.50 percent. As general class information, higher strength weld metal also means higher hardness sensitivity, so heat input and interpass temperature need to be controlled in line with the plate supplier’s recommendations.

Wire Design and Supply Form

LongTeng ER90S-G is a solid, drawn wire with a bright copper finish that protects the surface from rust and improves electrical contact at the tip. The catalogue shows diameters of 0.8, 1.0, 1.2 and 1.6 mm. Its packaging pages describe reference spool formats for gas-shielded wire, including small D100 and D200 spools of 1 kg and 5 kg, and 15 kg formats such as D270, D300 and BS300, packed in corrugated cardboard. These are the manufacturer’s reference packages, not a statement of what is on the shelf at any moment, so confirm the diameter and package for your order with our sales team.

Wire quality shows up at the feeder rather than in the datasheet. Consistent diameter, clean layer winding and an even coating all reduce bird-nesting and tip wear. When you receive spools, store them off the floor in their sealed bags, avoid condensation by letting cold spools reach workshop temperature before opening them, and return unused wire to its packaging at shift end. In the humid coastal climate of Oman these simple habits protect LongTeng ER90S-G from surface rust far better than any later cleaning step.

Key Features

The following points summarise what the catalogue supports for LongTeng ER90S-G, each one tied to a printed figure or to well-known class behaviour.

• It is listed against AWS A5.28 ER90S-G, a low-alloy gas-shielded solid wire class intended for steels in the 620 MPa strength range.
• Typical all-weld-metal tensile strength is listed at 660 MPa with a yield strength of 545 MPa.
• Typical elongation is listed at 25 percent, which gives the joint useful ductility for formed or pressurised structures.
• Typical Charpy impact energy is listed as 103, 111 and 121 J at minus 20 degrees Celsius for the three test specimens.
• Chemistry is controlled with carbon at 0.10 percent maximum and sulphur and phosphorus each at 0.025 percent maximum, which supports clean, crack-resistant weld metal.
• Molybdenum of 0.20 to 0.60 percent contributes to the strength level without adding nickel.
• Four diameters from 0.8 to 1.6 mm cover thin sheet through heavy multipass work.
• Reference currents run from 50 to 550 A DC electrode positive depending on diameter, so one wire family covers a wide set of power sources.

Where LongTeng ER90S-G Is Applied

The manufacturer names construction machinery, pipelines, ships and pressure vessels as target uses for LongTeng ER90S-G. In Oman and the Gulf the same steel grades appear in crane booms, excavator and loader frames, offshore support structures, skid-mounted process packages and water or gas transmission spool fabrication. Heavy equipment workshops in Sohar and Duqm, and marine repair yards that service vessels visiting Muscat, are typical places where a 620 MPa class MIG wire is specified so the weld does not become the weak zone beside high-strength plate.

Seven Star LLC also supports plants that weld repairs with LongTeng ER90S-G on high-strength components. For those jobs, request the procedure details from the base-metal supplier first, then match wire diameter and current from the reference table. Inspection afterwards is as important as the wire itself: hardness checks on repaired zones are common, and our catalogue includes portable instruments, for example the Phase II PHT-3500 portable hardness tester, that fabricators use to verify results. For the welding power source, see the Lincoln Electric Power Wave S500 and the ESAB Rebel EMP 285ic, both multi-process machines that run solid MIG wire.

Technical Specifications

The table lists the figures printed in the manufacturer catalogue for LongTeng ER90S-G. Values are typical values listed by the manufacturer. Download the datasheet extract from the Documents tab for the original layout.

Selecting and Setting Up the Wire

Match the LongTeng ER90S-G strength class to the base metal, then confirm diameter against plate thickness and position. Thin sections favour 0.8 or 1.0 mm wire at the lower end of the current range, while thick multipass joints are normally welded with 1.2 or 1.6 mm at higher current. Set the gas flow within the catalogue band for your diameter, shield the arc from draughts, and keep contact tips and liners clean so the wire feeds smoothly. Preheat and interpass limits come from the steel specification rather than from the wire datasheet, and any welding procedure should be qualified on the actual materials.

Call To Action

To request a quotation for LongTeng ER90S-G, send your required diameter, quantity and delivery point to the Seven Star LLC instrumentation and industrial supplies team in Muscat. We confirm package options, advise on the matching shielding gas and welding equipment, and supply the datasheet extract on request. Ask for the batch test certificate of LongTeng ER90S-G when you order so your quality department receives the verified mechanical and chemical results with the consignment.