Monel 400
UNS N04400
Supplier of Nickel Alloys and Specialist METALS
Monel 400
Trade Names
Monel® 400
UNS Ref:
N04400
Applications
Pumps, valves, and fittings, marine engineering, chemical and hydrocarbon processing equipment, shafts,, fasteners, and heat exchangers.
Standards
ASTM B-127 ASME SB-127 AMS 4544 QQ-N-281
Available Forms & Sizes
Range From
Range To
Round Bar
9.53mm
267mm
Sheet & Plate
0.25mm
101.6mm
Pipe
0.5 in
8 in
Pipe Fittings
0.5 in
8 in
Flanges
0.5 in
8 in
Monel 400 is a nickel-copper alloy known for its excellent corrosion resistance, high strength, and good mechanical properties, even at elevated temperatures. It is part of the Monel family of alloys, which are primarily composed of nickel (about 63%) and copper (about 28%). Monel 400 also contains small amounts of iron, manganese, carbon, and silicon, among other elements.
Characteristics
Key characteristics of Monel 400 include:
Corrosion Resistance:
- Monel 400 exhibits excellent corrosion resistance in various environments, including seawater, acids (sulfuric acid, hydrochloric acid), and alkaline solutions.
- It is highly resistant to stress-corrosion cracking and corrosion fatigue.
Mechanical Properties:
- Monel 400 has good mechanical properties, including high tensile strength and ductility.
- It retains its mechanical properties at both low and elevated temperatures.
High-Temperature Performance:
- Monel 400 maintains its strength and corrosion resistance at elevated temperatures, making it suitable for high-temperature applications.
Magnetic Properties:
- Monel 400 is ferromagnetic at room temperature.
Weldability:
- Monel 400 is weldable using various welding techniques, including gas-tungsten arc welding (GTAW) and gas-metal arc welding (GMAW).
- It does not require post-weld heat treatment in most applications.
Fatigue Resistance:
- The alloy exhibits good fatigue resistance, making it suitable for applications with cyclic loading.
Thermal Conductivity:
- Monel 400 has relatively high thermal conductivity, making it useful in certain heat exchange applications.
Machinability:
- Monel 400 is generally machinable, but it can work harden during machining, requiring appropriate tools and techniques.
Applications:
- Marine Industry: Monel 400 is widely used in marine applications, such as propeller shafts, pump shafts, and seawater valves, due to its corrosion resistance in seawater.
- Chemical Processing: It is used in various chemical processing equipment, including pumps, valves, and heat exchangers.
- Aerospace: Monel 400 finds applications in certain aerospace components where corrosion resistance is crucial.
- Oil and Gas Industry: It is used in equipment for oil and gas extraction and processing.
Monel K-500:
- Monel 400 is related to Monel K-500, which includes small additions of aluminum and titanium for increased strength and hardness.
Applications
Inconel 625 is commonly used in the manufacturing of components such as pipes, valves, fasteners, heat exchangers, and turbine blades. Its combination of high strength, corrosion resistance, and other mechanical properties makes it a popular choice for demanding and harsh environments.
