Monel R405 Hexagon Bar or Monel R405 Hex bar is used for an array of applications. However one difference between the standard Monel 400 and Monel R405 is the addition of Sulfur which means that welding Monel R405 is not possible. 405 proves resistant to corrosion in sea water, steam at high temps, chemical environments and other marine environments. Used in chemical, oil and other marine industries.
Moderate to high strength Monel R405 does also carry high resistance to sulfuric acid and hydrofluoric acids. Monel R405 is used in pumps and pump shafts, propellers, nuclear applications, pickling processes, oil and gas.
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Michlin made a video on 405, just hit play to watch below: