has a more homogeneous structure and more uniform fabrication behavior and mechanical properties than the conventional Lapelloy. It is used for highly stressed parts involving service temperatures up to 1200 Β° F. Lapelloy "C" has greater ductility and impact strength at both room and elevated temperatures than conventional Lapelloy when heat treated to the same strength level.
High mechanical properties can be developed by heat treatment. It has good resistance to scaling and oxidation for continuous service up to 1400 Β° F. The alloy offers best corrosion resistance when in the hardened and tempered condition. It is used for compressor wheels, turbine shafts, compressor buckets, blades, and bolts.
Type analysis of Carpenter Lapelloy "C" is:Carbon, 0.20-0.25%; Manganese, 0.65-1.00%; Silicon, 0.50% max. ; Chromium, 11.00-12.00%; Nickel, 0.50% max.; Molybdenum, 2.50-3.00% ; Copper, 1.75-2.25Β°-/o, and Nitrogen, 0.06-0.10%.
Lapelloy "C" is made by Carpenter's Mel-Trol process, a new quality control system with patented ingot design. Mel-Trol is used to minimize the causes of inconsistent centerline quality which so often causes erratic service in alloys of this type made by conventional methods.
Lapelloy "C" is readily machinable; in the annealed condition it is comparable to Type 420 stainless steel. It is available in billets, hot-rolled and cold-finished bars, wire, cold-rolled strip, and special shapes.