The Weld Star ER309L Stainless Steel TIG Wire is a low-carbon austenitic filler designed for TIG (GTAW) welding where excellent corrosion resistance, high-temperature performance and dissimilar metal compatibility are required. Its low carbon content reduces the risk of intergranular carbide precipitation, improving resistance to intergranular corrosion without the need for stabilising elements such as niobium or titanium.
This wire performs exceptionally well in carburising atmospheres and high-temperature environments, making it ideal for furnace components and heat-resistant fabrications. ER309L is also widely used for dissimilar welding between stainless and carbon steels, as well as for buffer layers prior to hardfacing or cladding operations. Typical applications include industrial furnaces, boiler parts, annealing chambers, heat exchangers and fused salt treatment installations.
Key Features
Low-Carbon Austenitic Stainless Alloy: Reduces risk of intergranular corrosion without stabilisers such as Nb or Ti.
Excellent High-Temperature Performance: Strong resistance to oxidation and corrosion in elevated-temperature environments.
Ideal for Dissimilar Metal Welding: Suitable for joining stainless to carbon steels and for buffer layer applications.
Performs in Carburising Atmospheres: Reliable in furnace and heat-treatment environments.
Versatile Industrial Use: Ideal for furnaces, boilers, heat exchangers, annealing chambers and cladding work.
Consistent Quality: Produced from virgin raw materials by specialised steel mills for dependable chemistry and performance.
Standards Compliance: EN ISO 14343-A – W 23 12 L | AWS A5.9 – ER309L.
Typical Chemical Composition (%): C: 0.019 | Mn: 1.82 | Si: 0.34 | P: 0.025 | S: 0.010 | Ni: 12.70 | Cr: 23.35 | Mo: 0.06 | Cu: 0.07.
Mechanical Properties (Typical): Tensile Strength: ≥510 MPa | Yield Strength: ≥320 MPa | Elongation: ≥25% | Impact Strength: ≥50 J (Values may vary depending on welding parameters, base material and shielding gas).
Shielding Gas: TIG – I1 (Argon) per EN ISO 14175.
Welding Positions: PA, PB, PC, PD, PE, PF, PG per EN ISO 6947.
Workshop-Friendly Packaging: Available in multiple TIG diameters (1.00mm, 1.20mm, 1.60mm, 2.40mm and 3.20mm), supplied in 5kg packs with 1000mm rod length for professional workshop and site use.
Download Product Specification.
