Techalloy 309LMo description: This product is similar to 309 with the exception for the addition of 2.0 - 3.0% molybdenum to increase its pitting corrosion resistance in halide-containing environments. The primary application for this filler metal is surfacing of base metals to improve their resistance to corrosion. The 309LMo is used to achieve a single-layer overlay with a chemical composition similar to that of a 316L stainless steel. It is also used for the first layer of a multilayer overlays with filler metals such as 316L or 317L stainless steel.