Alloy 400, also known as Monel 400, is a nickel-copper alloy known for its excellent corrosion resistance and high strength across a range of temperatures. It performs exceptionally well in marine and chemical environments, particularly resisting saltwater corrosion and various acids. The alloy's toughness and durability make it ideal for applications like pump shafts, valves, and heat exchangers. Alloy 400 is widely used in industries such as oil and gas, marine engineering, and chemical processing due to its versatility and reliability.