What materials are compatible with Monel 400?
What is Monel 400?
Monel 400, also known as Alloy 400, is a nickel alloy supplied by NeoNickel. It contains a high percentage of copper, which makes it extremely corrosion resistant.
Chemical Composition
Alloys are metals combined with one or more alloying elements to enhance their properties. Monel 400 is a nickel-copper alloy that has a higher copper content than other nickel alloys.
Nickel
Nickel is the parent metal of Monel 400, meaning it makes up its main component. In fact, nickel is present in a whopping 63-70% of the alloy. This high nickel content also makes it resistant to chloride-induced stress corrosion cracking.
Copper
Copper is the second largest element, making up 28-34% of its chemical composition. Copper is a highly corrosion resistant metal, thus enhancing the corrosion resistance of Monel 400.
Iron
The iron content of Monel 400 alloy is 0-2.5%, which helps to increase its mechanical strength and overall stability.
Other Elements
Alloy 400 contains trace amounts of other elements, including manganese (0-2%), silicon (0-0.5%), carbon (0-0.3%), and sulfur (0-0.024%).
Properties of Monel 400
Corrosion Resistance
Monel 400 alloy exhibits excellent corrosion resistance to a wide range of media, including seawater, hydrofluoric acid, fluorine, sulfuric acid, and alkalis. In fact, it is one of the few alloys that can be used in hydrofluoric acid and fluorine environments. Its high nickel content also makes it immune to chloride-induced stress corrosion cracking.
High Strength
Alloy 400 has high strength even at extreme temperatures. It maintains structural integrity and is suitable for high stress or high pressure applications. You can count on it to maintain good mechanical properties from sub-zero to 549°C.
Good Ductility
Monel 400 has good ductility and can be processed into a variety of shapes. NeoNickel offers Alloy 400 in a variety of forms including round bars, round tubes, pipes, fittings, flanges, plates and more. Being able to purchase Alloy 400 in such a variety of forms means it can be used in almost any application.
Applications of Monel 400
Chemical Processing
Monel 400 is resistant to a wide range of chemicals, including hydrofluoric acid, fluorine, sulfuric acid and alkalis. As a result, it is often the alloy of choice in the chemical processing industry. It is used in pumps, pipes, valves and pressure vessels. It is a cost-effective option for the industry, meaning they do not have to replace parts as often due to corrosion.
Oil and Gas
Like the chemical processing industry, the oil and gas industry also has to deal with a variety of corrosive substances. Monel 400 is one of the few alloys that can handle this type of corrosion. It can also withstand the harsh environment of seawater, so it is often used in underwater applications.
Marine Engineering
Seawater will quickly corrode most metals, such as iron or stainless steel. Due to its resistance to seawater corrosion, Monel 400 alloy is often used in marine engineering, including submarines, underwater pipes and valves.
Aerospace
Monel 400 can also be used in the aerospace industry, although this is less common. This is because it can withstand extreme temperatures from below zero to over 500°C. It is often used in aircraft fuel tanks, exhaust systems, and landing gear components.
Monel 400 is a low-cost, corrosion-resistant nickel alloy. Due to its excellent corrosion resistance, it is often the alloy of choice in the chemical processing industry and underwater applications. It can be used in areas that other alloys cannot reach.
Visit our Alloy 400 product page to learn more about this practical alloy. There you will find a complete analysis of its chemical composition and properties, including tensile strength, coefficient of thermal expansion, and thermal conductivity. If you need help understanding this data and its properties, please contact us at ss@gneesteel.com.
If you think Alloy 400 alloy is right for you, please fill out our enquiry form. It is suitable for a range of industries, including chemical processing, offshore engineering, and the oil and gas industry.
