Monel 400 Alloy N04400
Monel 400 is a nickel copper alloy with high strength and broad corrosion resistance, including seawater, hydrofluoric acid, sulphuric acid and alkali. It is used across marine engineering, chemical and hydrocarbon…
What This Product Is For
Monel 400 is a nickel copper alloy with high strength and broad corrosion resistance, including seawater, hydrofluoric acid, sulphuric acid and alkali. It is used across marine engineering, chemical and hydrocarbon production equipment, valves, pumps, shafts, fittings, fasteners and heat exchangers. Supply covers pipe, plate, strip, round bar, wire and profile in the same grade.
Key Benefits
- Nickel copper chemistry resists seawater and brine where stainless pits
- One of the few alloys that will take hydrofluoric acid service
- Resists sulphuric acid and alkali, so one grade can cover a mixed plant
- High strength for loaded parts such as pump shafts and valve internals
- Available across pipe, plate, strip, bar, wire and profile
Who It Is For
- Marine and offshore equipment fabricators
- Refinery engineers specifying hydrofluoric acid service materials
- Pump and valve manufacturers sourcing shaft and trim material
- Heat exchanger builders working with saline cooling water
Problems It Solves
- Pitting and crevice failure of stainless components in seawater
- Lack of a workable material for hydrofluoric acid duty
- Premature shaft and fastener failure in chemical and hydrocarbon plant
- Buying pipe, bar and wire in one nickel copper grade from separate mills
Application Scenarios
- Marine engineering and seawater handling equipment
- Hydrofluoric acid alkylation units and related hardware
- Hydrocarbon production equipment, valves and pumps
- Heat exchangers running brackish or saline cooling water
Specifications
Every value below is taken from the published product data. Where a figure is not published it is left out rather than estimated.
| Grade | Monel 400, UNS N04400 |
|---|---|
| Alloy Family | Nickel copper alloy |
| Nickel | 63.0 percent minimum |
| Copper | 28.0 to 34.0 percent |
| Iron | 2.5 percent maximum |
| Manganese | 2.0 percent maximum |
| Carbon | 0.3 percent maximum |
| Silicon | 0.5 percent maximum |
| Sulphur | 0.024 percent maximum |
| Product Forms | Pipe, plate, strip, round bar, wire, profile |
| Media Resistance | Seawater, hydrofluoric acid, sulphuric acid, alkali |
Technical Features
- Nickel copper alloy with high strength
- Nickel 63.0 percent minimum and copper 28.0 to 34.0 percent
- Iron 2.5 percent maximum, manganese 2.0 percent maximum
- Carbon 0.3 percent maximum, silicon 0.5 percent maximum, sulphur 0.024 percent maximum
- Designation UNS N04400
Materials
- Nickel copper alloy 400
Manufacturing Process
- Hot working
- Cold working
- Wire drawing
- Machining
Quality Control
- Chemistry verified against the nickel and copper ranges for N04400
- Sulphur held to 0.024 percent maximum to protect hot workability
- Dimensional inspection on each product form
- Certificate issued naming the grade and heat
Customisation Options
- Pipe, plate, strip, bar, wire or profile to your specification
- Cut lengths and machined blanks on request
- Matched fasteners and fittings supplied with the main item
Use Guide
- Use Monel 400 for seawater, hydrofluoric acid, sulphuric acid and alkali service
- Step up to K500 when the part carries mechanical load at temperature
- Weld with matching nickel copper filler and clean the joint before service
- Avoid stagnant seawater conditions where biofouling can set up local cells
How It Compares With the Alternatives
| Monel K500 | K500 is the higher strength member of the same nickel copper family, chosen for loaded shafts and fasteners, while Monel 400 covers general corrosion duty |
|---|---|
| 316L stainless steel | Monel 400 resists seawater and hydrofluoric acid, both of which will destroy 316L |
| Nickel 200 | Pure nickel is the better choice in strong caustic, Monel 400 in seawater and hydrofluoric acid because of the copper content |
Related Products
Nickel 200 Seamless Pipe
Nickel 200 seamless pipe is commercially pure wrought nickel supplied to ASTM B161 under UNS N02200. It is the standard choice for…
View specifications →
Nickel Alloy 625 Exhaust Tubing
Nickel alloy 625 exhaust tubing is cold worked seamless tube covered by ASTM B444 under UNS N06625, also carried as BS 3074 NA21…
View specifications →
SS316 Equal Angle Bar 75 x 75 x 6 mm x 6 m
This is a 316 stainless equal angle bar in 75 x 75 x 6 mm section at 6 m length, produced to JIS, AISI and ASTM chemical…
View specifications →
Monel Alloy K500
Monel Alloy K500 is a nickel copper superalloy with high strength and strong corrosion resistance in marine environments. It is…
View specifications →Monel 400 Alloy N04400 Questions
What is the copper content
Is Monel 400 suitable for hydrofluoric acid
Which product forms can you supply
What is the UNS number
Where is the alloy commonly used
When should I use K500 instead
Quote Monel 400 Alloy N04400
Send the size, wall or thickness, quantity and destination port. Certificates, packing and lead time are confirmed on the quotation.