S522508-I26 - Lincoln 308/308L Stainless MIG Wire .035 30lb Spool

Technical Overview

The Lincoln Electric 308/308L (I) is a high-quality austenitic stainless steel solid wire designed for the Gas Metal Arc Welding (GMAW) process. This consumable meets AWS A5.9 specifications for both ER308 and ER308L classifications. The chemical composition is strictly controlled, featuring a maximum carbon content of 0.03%. This low carbon formulation is critical for preventing carbide precipitation at the grain boundaries during the welding thermal cycle, thereby significantly enhancing the weldment's resistance to intergranular corrosion without the need for post-weld heat treatment.

The wire is engineered for joining 18% Cr - 8% Ni austenitic stainless steels, specifically Types 304, 304L, 308, and 308L. It is also suitable for welding Types 201 and 302. The inclusion of the 'I' designation typically refers to the Indalco manufacturing process, known for superior surface finish and consistent cast and helix, which promotes reliable feedability through long conduit liners and contact tips. Mechanical properties of the deposited weld metal are excellent, providing high tensile strength and ductility suitable for service temperatures up to 350°C (660°F).

Metallurgical Properties

The alloy composition balances chromium and nickel to ensure a ferrite number (FN) that prevents hot cracking while maintaining excellent corrosion resistance. The wire is designed to operate with Direct Current Electrode Positive (DCEP) polarity. Recommended shielding gases include mixtures of Argon with 1-2% Oxygen or 2-5% Carbon Dioxide to stabilize the arc and improve wetting action. For optimal performance in spray transfer modes, high-argon blends are preferred.