Nickel and nickel alloys have excellent corrosion resistance and heat resistance. They are widely used in harsh corrosive environment and show effective resistance. In many cases, these corrosive conditions are not resistant to materials such as stainless steel or super stainless steel. Nickel itself is a multifunctional corrosion-resistant material with the characteristics of high strength, high plasticity, good ductility and malleability. As an alloying element, nickel has metallurgical compatibility with other metal elements in most composition ranges, and has become many binary and ternary alloys and other complex alloy systems. Nickel and nickel alloys are widely used in pressure vessels, heat exchangers, towers, evaporators, agitators, condensers, reactors, storage and transportation in chemical, alkali, metallurgy, petroleum and other industries. Nickel is also stable in many organic acids and can be used in pharmaceutical and food industries.