Monel 400 is a nickel-copper alloy that offers excellent corrosion resistance and high strength over a wide temperature range. It is widely used in equipment such as pumps, valves, and tanks in the marine and chemical processing industries. It is a solid solution alloy that cannot be hardened by heat treatment, but can be strengthened by cold working. Pipe Cap is also called Steel Plug, it usually welded to the pipe end or mounted on the external thread of the pipe end to cover the pipe fittings. To close the pipeline so the function is the same as the pipe plug.(You can also to use a blind plate to close the pipeline, differently the blind plate is detachable and the welded steel cap is not removable. The cap includes a convex cap, a conical shell, a variable diameter section, a flat cover and a constricted opening.)