ED035122 - Lincoln Blue Max ER320LR Stainless MIG Wire 0.035 33lb

Technical Overview: Lincoln Electric Blue Max MIG 320LR

The Lincoln Electric Blue Max MIG 320LR is a premium austenitic stainless steel welding wire designed specifically for joining Alloy 20 base materials. This consumable meets AWS ER320LR classification. The 'LR' designation stands for 'Low Residuals,' indicating a tightly controlled chemical composition where elements such as carbon, silicon, phosphorus, and sulfur are kept to minimum levels. This specific chemistry is critical for mitigating the tendency toward microfissuring (hot cracking), a common metallurgical challenge when welding fully austenitic materials like Alloy 20.

In addition to its crack-resistant properties, the wire is stabilized with Columbium (Niobium) to prevent carbide precipitation and subsequent intergranular corrosion. This makes it an ideal choice for fabrication involving Carpenter 20, ASTM B463, B464, B472, and B474 materials. The deposited weld metal exhibits exceptional corrosion resistance, particularly in environments containing sulfuric acid, phosphoric acid, and other aggressive organic and inorganic media. It is engineered for use with direct current positive (DCEP) polarity and operates best with Argon or Argon-Helium shielding gas mixtures.

Industries relying on the integrity of chemical processing equipment—such as petrochemical plants, pharmaceutical manufacturing, and metal pickling facilities—specify Blue Max 320LR to ensure the longevity and safety of their pressure vessels and piping systems. The 33 lb spool provides ample material for continuous automated or semi-automated welding operations.