INCONEL® alloy 625LCF (UNS N06626 / W. Nr. 2.4856) was developed as a fatigue-resistant, bellows-quality version of INCONEL alloy 625. Alloying, melting and processing are designed and controlled to provide a sheet product with optimum resistance to low-cycle and thermal fatigue at up to 1200°F (650°C). The alloy offers a high level of performance in aircraft exhaust and automotive flexible coupling bellows, expansion joints in process or transport piping, and other applications involving resistance to low-cycle or thermal fatigue. INCONEL alloy 625LCF is covered by U.S patent 4,765,956. Table 1 - Limiting Chemical Composition, wt %* *UNS N06626 a Plus Ta. ªMean coefficient of linear expansion between 70°F (21°C) and temperature shown. Nickel..........................................................................58.0 min. Chromium..................................................................20.0-23.0 Molybdenum................................................................8.0-10.0 Niobiuma .....................................................................3.15-4.15  Iron...............................................................................5.0 max. Carbon.......................................................................0.03 max. Manganese................................................................0.50 max. Silicon........................................................................0.15 max. Sulfur........................................................................0.015 max. Aluminum...................................................................0.40 max. Titanium ....................................................................0.40 max. Phosphorus.............................................................0.015 max. Cobalt.........................................................................1.0 max. Nitrogen....... ...........................................................0.02 max.