LongTeng E71T-C1A4-Ni1 Nickel Flux-Cored Welding Wire

Introduction to LongTeng E71T-C1A4-Ni1 Nickel-Bearing Flux-Cored Wire

Some structures must stay tough at low temperature, and the welding wire chosen for them is often a flux-cored type with a small nickel addition. LongTeng E71T-C1A4-Ni1 is the designation printed in the Jiangsu Longteng Special Steel Group catalogue for a carbon dioxide shielded flux-cored wire that carries 0.90 percent nickel in its listed chemistry and reports Charpy impact energy at two low temperatures. This page uses the designation exactly as the catalogue prints it. The catalogue conformance line for this entry is not reproduced here, because it could not be verified against the full designation, so for any certification requirement the buyer should ask for the test certificate that names the class the lot was tested to.

Seven Star LLC supplies LongTeng E71T-C1A4-Ni1 to fabricators, pressure equipment shops and EPC contractors in Oman and the GCC, backed by engineering support from Muscat. Every number below is a typical value listed by the manufacturer, and the statements on classification are general information about wire families of this type.

Why Nickel Matters in a Rutile Wire

Plain carbon steel weld metal loses toughness as temperature falls, because the crystal structure favours brittle cleavage rather than ductile tearing. A modest nickel addition, in the region of one percent, refines the microstructure and lowers the temperature at which the transition occurs. General class information says that low-alloy rutile flux-cored wires carrying a Ni1 suffix are formulated around that addition, and the 0.90 percent figure in the catalogue table for LongTeng E71T-C1A4-Ni1 is consistent with it. The same table shows controlled residuals, with chromium at or below 0.15 percent, molybdenum at or below 0.35 percent and vanadium at or below 0.05 percent.

Together with low carbon at 0.04 percent, manganese at 1.28 percent and silicon at 0.38 percent, the chemistry points to a clean, low-carbon weld metal designed for toughness rather than for extra strength. Sulphur at 0.006 percent and phosphorus at 0.011 percent are also low, and those two elements are the usual enemies of impact performance.

Mechanical Properties Printed for LongTeng E71T-C1A4-Ni1

The catalogue lists 570 MPa tensile strength, 510 MPa yield strength and 27 percent elongation. The impact line reads 135 and 120 J against test temperatures printed as minus 30 and minus 40 degrees Celsius. Those numbers suggest high absorbed energy even at minus 40, which is the property that makes a nickel-bearing wire attractive for cold-service or dynamically loaded structures. Remember that these are typical values from the manufacturer, and that a code-compliant job will rely on procedure qualification and the lot certificate, not on a web page.

Shielding Gas, Diameters and Current

The reference table lists carbon dioxide shielding at 20 to 25 litres per minute and three diameters. The 1.2 mm wire is shown at 120 to 300 A, the 1.4 mm wire at 150 to 400 A and the 1.6 mm wire at 180 to 450 A, all on DC electrode positive. Choosing the lower end of each range gives better control in vertical or overhead work, whereas the upper end suits flat and horizontal positions with high deposition. Because this grade is listed only with carbon dioxide, an argon mixture should not be used unless the manufacturer confirms it in writing.

Highlights of LongTeng E71T-C1A4-Ni1

• The listed 0.90 percent nickel supports toughness in low-temperature service.
• Impact energy is reported as 135 and 120 J at the two temperatures printed in the catalogue, minus 30 and minus 40 degrees Celsius.
• Yield strength of 510 MPa with 27 percent elongation gives a balance of strength and ductility.
• Three sizes, 1.2, 1.4 and 1.6 mm, cover a wide span of plate thickness and deposition needs.
• Carbon dioxide shielding keeps the gas supply simple on yard and site work.
• Residual chromium, molybdenum and vanadium are printed as limits, which helps keep the deposit low-alloy.
• The wire comes from a producer that draws its own steel rod, so the origin of the material is traceable to a single group.

Applications for LongTeng E71T-C1A4-Ni1 Across Oman and the GCC

As general class information, a nickel-bearing rutile wire of this kind is considered for structural steelwork that sees cold, impact or fatigue loading, as well as for pressure-retaining fabrications where the code asks for proven toughness. In the Sultanate of Oman such jobs include offshore and onshore oil and gas structures, process module frames, storage tank components, pipe supports and heavy mechanical fabrication in Sohar, Duqm and the Muscat region. Refrigerated services and low-temperature qualification requirements set by international clients also make toughness data important.

Seven Star LLC supports buyers of LongTeng E71T-C1A4-Ni1 with datasheet exchange and enquiry handling. When you ask, name the base steel, plate thickness, welding position and the impact temperature your specification demands, so the available documents can be checked before ordering. No classification society or third-party approval is claimed on this page, and any such need should be listed in the enquiry.

Good Practice for Running LongTeng E71T-C1A4-Ni1

The advice here is general and not a warranty. Keep the electrode on positive polarity, maintain the gas flow in the listed band and protect the arc from wind with screens. Preheat and interpass temperatures should follow the procedure for the base steel, because excessive heat input reduces toughness in any wire. Remove slag fully between passes, avoid weaving too wide and keep a steady travel speed. Store spools in dry conditions in their sealed packs, as moist flux raises hydrogen.

Technical Specifications of LongTeng E71T-C1A4-Ni1

The values below are the typical values listed by the manufacturer for LongTeng E71T-C1A4-Ni1.

Power Sources and Temperature Checks

Toughness-critical welding depends on controlled heat input. Many fabricators therefore run nickel-bearing wire from an inverter such as the Lincoln Electric Power Wave S500, which Seven Star LLC supplies, or from the ESAB Rebel EMP 285ic, and they verify interpass temperature with the FLIR E96 thermal imager.

How to Order

Contact Seven Star LLC with the diameter, quantity and delivery point for LongTeng E71T-C1A4-Ni1, and our team in Muscat will respond about availability and the documents that can accompany the lot. The attached catalogue extract acts as the LongTeng E71T-C1A4-Ni1 datasheet for your engineers, and a formal request for quotation can follow once the grade and certificate wording are agreed for your project in Oman or the GCC.