Monel® is a trade name for a group of copper-based nickel alloys. Monel has high strength and excellent saltwater resistance, as well as the ability to perform well in low-temperature environments, i.e there is not a large reduction in ductility and there is an increase in hardness and strength. Monel® tends to work harden during cold forming, making it difficult to process. Typical alloys are Monel® 400, R-405, and K-500.