L-605

Alloy L605  is a non-magnetic cobalt-based superalloy. It is the strongest of the formable cobalt alloys, useful for continuous service up to 1800°F and maintaining useful strength up to 2150°F.   L605 maintains good oxidation resistance up to 1900° F and has a unique ability to resist corrosion in very severe environments. L605 Is also highly resistant to hydrochloric acid, nitric acid, and wet chlorine (subject to the need for exercising care in its selection at certain concentrations and temperatures).

Because of long and widespread use, alloy L05 has been the subject of many investigations to determine its properties over a wide range of conditions, thus making it an unusually well-characterized material. Alloy L605 is also known as alloy 25.

When exposed for prolonged periods at intermediate temperatures, alloy L-605 exhibits a loss of room temperature ductility in much the same fashion as other superalloys, such as Hast-X or Inco 625.

Alloy L605 is welded using gas tungsten arc, gas metal arc, shielded metal arc, electron beam, and resistance welding. Submerged arc welding is not recommended. Use good joint fit-up, minimum restraint, low inter-pass temperature, and cool rapidly after welding. For maximum ductility fabricated components should be annealed 2150-2250°F, followed by a rapid cool.