Monel 400 (ALLOY 400 - UNS N04400)

Monel 400 is a nickel-copper alloy (about 23% Cu–67% Ni ) that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Alloy 400 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good weldability, good corrosion resistance and high strength. A low corrosion rate in rapidly flowing brackish or seawater combined with excellent resistance to stress-corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions led to its wide use in marine applications and other non-oxidizing chloride solutions. This nickel alloy is particularly resistant to hydrofluoric and hydrochloric acids when they are de-aerated. As would be expected from its high copper content, alloy 400 is rapidly attacked by nitric acid and ammonia systems.
Monel 400 is a nickel-copper alloy that is hardened by cold working only. Monel 400 has low corrosion rate in flowing seawater, therefore it is widely used in marine applications. Monel 400® also has excellent resistance to stress corrosion cracking in most freshwaters. Monel 400® can be used in temperatures up to 1000 º F. The alloy has great mechanical properties at subzero temperatures.

Corrosion Resistant Monel 400
Alloy 400 is virtually immune to chloride ion stress corrosion cracking in typical environments. Generally, its corrosion resistance is very good in reducing environments, but poor in oxidizing conditions. It is not useful in oxidizing acids, such as nitric acid and nitrous. Nevertheless, it is resistant to most alkalis, salts, waters, food products, organic substances and atmospheric conditions at normal and elevated temperatures.
This nickel alloy is attacked in sulfur-bearing gases above approximately 700° F and molten sulfur attacks the alloy at temperatures over approximately 500° F.
Monel 400 offers about the same corrosion resistance as nickel but with higher maximum working pressures and temperatures and at a lower cost due to its superior ability to be machined.
In what applications is Monel 400 used?

• Marine engineering
• Chemical and hydrocarbon processing equipment
• Gasoline and freshwater tanks
• Crude petroleum stills
• De-aerating heaters
• Boiler feed water heaters and other heat exchangers
• Valves, pumps, shafts, fittings, and fasteners
• Industrial heat exchangers
• Chlorinated solvents
• Crude oil distillation towers

Fabrication with Monel 400
Alloy 400 can easily be welded by gas-tungsten arc, gas metal arc or shielded metal arc processes using appropriate filler metals. There is no need for post weld heat treatment, however, thorough cleaning after welding is critical for optimum corrosion resistance, otherwise there is the risk of contamination and embrittlement.
Finished fabrications can be produced to a wide range of mechanical properties when proper control of the amount of hot or cold working and the selection of appropriate thermal treatments is done.
Like most other nickel alloys, Monel 400 is typically tough to machine and will work harden. However, excellent results can e obtained if you make the correct choices for tooling and machining.
Monel 400 pipe is available up to 8" NB. Larger sizes are available in welded construction (100% X-ray) and can also be fabricated to order. Monel 400 tubing is available up 3". Monel 400 redrawn tubes and tubing with tight tolerances can be supplied in almost any size no matter how small the size or quantity.

Corrosion Resistant Monel 400
Alloy 400 is virtually immune to chloride ion stress corrosion cracking in typical environments. Generally, its corrosion resistance is very good in reducing environments, but poor in oxidizing conditions. It is not useful in oxidizing acids, such as nitric acid and nitrous. Nevertheless, it is resistant to most alkalis, salts, waters, food products, organic substances and atmospheric conditions at normal and elevated temperatures.
This nickel alloy is attacked in sulfur-bearing gases above approximately 700° F and molten sulfur attacks the alloy at temperatures over approximately 500° F.
Monel 400 offers about the same corrosion resistance as nickel but with higher maximum working pressures and temperatures and at a lower cost due to its superior ability to be machined.
In what applications is Monel 400 used?

• Marine engineering
• Chemical and hydrocarbon processing equipment
• Gasoline and freshwater tanks
• Crude petroleum stills
• De-aerating heaters
• Boiler feed water heaters and other heat exchangers
• Valves, pumps, shafts, fittings, and fasteners
• Industrial heat exchangers
• Chlorinated solvents
• Crude oil distillation towers

Fabrication with Monel 400
Alloy 400 can easily be welded by gas-tungsten arc, gas metal arc or shielded metal arc processes using appropriate filler metals. There is no need for post weld heat treatment, however, thorough cleaning after welding is critical for optimum corrosion resistance, otherwise there is the risk of contamination and embrittlement.
Finished fabrications can be produced to a wide range of mechanical properties when proper control of the amount of hot or cold working and the selection of appropriate thermal treatments is done.
Like most other nickel alloys, Monel 400 is typically tough to machine and will work harden. However, excellent results can e obtained if you make the correct choices for tooling and machining.
Monel 400 pipe is available up to 8" NB. Larger sizes are available in welded construction (100% X-ray) and can also be fabricated to order. Monel 400 tubing is available up 3". Monel 400 redrawn tubes and tubing with tight tolerances can be supplied in almost any size no matter how small the size or quantity.
Monel 400 Seamless Tubes are offered by us in wide range. All of our ranges are made up of high quality material procured from the reliable vendors. Our products are known for there durability, high utility and high quality, and they effectively serve numerous industries successfully across the world. Following specifications are available in our products-: Our products are compliant with norms ASTM, ASME SB 163 / 165. These are available in grades Monel 400 (uns no. N04400). These are available in dimensions 1 mm OD up to 254 mm OD in 0.2 to 20 mm thickness
Monel 400 sheet is available in thicknesses ranging from .018 to .140". Monel 400 strip in coil from is available in lighter gauges up 24" wide. Monel 400 plate is available up 3" thick.

Monel 400 Round Bar is available in wrought bar up to 11" diameter and larger sizes and shapes may be forged to order.
Monel 400 flanges offered by us are available in different sizes and are precisely engineered under the strictest of quality norms, and as per the international standards. These Monel flanges are considered as a durable, corrosion resistance, and oil & temperature resistance and have high tensile strength product range. These Monel flanges are basically used with stub end or daft which is butt welded to the pipe with the flange loose behind it. To reduce cost these Monel flanges are supplied without a hub and/or in treated, coated carbon steel.  Clients can avail these products in 1/8" NB TO 48"NB sizes and Monel 400 (UNS N0.4400) grade.  As per the ASTM / ASME SB 163 / 165 standards, these are available in different forms:Socket Weld, Weld Neck, Slip on, Long Weld Neck, Blind, Reducing, Lapped, Spectacle, Screwed and Ring Joint. 

Monel 400 Fasteners exported by us are widely appreciated for their dimensional accuracy, high performance and cost effectiveness. Known for long service life, each piece of these Monel fasteners is developed using premium quality, corrosion resistant steel to ensure optimum degree of satisfaction. Our product range finds its usage in various industrial operations. Our range is as per the ASTM / ASME SB 163 / 165 standards and are available in standard grade: Monel 400 (UNS No. N04400). 

Available forms are

Monel 400 Seamless Pipe,  Monel 400 Welded Pipe,  Monel 400 Seamless Tube,  Monel 400 Welded Tube,  Monel 400 Round Bars,  Monel 400 wire,  Monel 400 Sheet,  Monel 400 Plate,  Monel 400 Forgings,  Monel 400 Pipe Fittings,  Monel 400 Flanges, Monel 400 Fasteners