Home --> PRODUCTS --> Ti Ni Alloy --> Monel alloy
Name:MONEL 400 (UNS N04400)
Download PDF Copy
Brief introduction: MONEL 400 (UNS N04400)
Monel 400®, or K400 ( also known as UNS 04400), is used known for having high strength and resistance to most corrosive elements, especially saltwater.
Product Description
Service
Why choose us?
Buyers review

Monel 400 is a nickel-copper alloy (about 67% Ni – 23% Cu) 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 corrosion resistance, good weldability 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.

Monel® Alloy 400

This nickel alloy is particularly resistant to hydrochloric and hydrofluoric 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..

In what forms is Monel 400 Available at Mega Mex?

  • Sheet
  • Plate
  • Bar
  • Pipe & Tube (welded & seamless)
  • Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
  • Wire

What are the characteristics of Monel 400?

Resistant to seawater and steam at high temperatures
Excellent resistance to rapidly flowing brackish water or seawater
Excellent resistance to stress corrosion cracking in most freshwaters
Particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated
Offers some resistance to hydrochloric and sulfuric acids at modest temperatures and concentrations, but is seldom the material of choice for these acids
Excellent resistance to neutral and alkaline salt
Resistance to chloride induced stress corrosion cracking
Good mechanical properties from sub-zero temperatures up to 1020° F
High resistance to alkalis

Chemical Composition, %

C Mn S Si Ni Cu Fe
.30 max
2.00 max
.024 max
.50 max
63.0 min
28.0-34.0
2.50 max

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.

Fabrication with Monel 400




ASTM Specifications

Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet / Plate Bar Forging Fitting Wire
B165
B725
B163
B127
B164
B564
B366

Mechanical Properties

Typical room temperature Tensile Properties of Annealed Material

Product Form Condition Tensile (ksi) .2% Yield (ksi) Elongation (%) Hardness (HRB)
Rod & Bar
Annealed
75-90
25-50
60-35
60-80
Rod & Bar
Cold-Drawn Stress Relieved
84-120
55-100
40-22
85-20 HRC
Plate
Annealed
70-85
28-50
50-35
60-76
Sheet
Annealed
70-85
30-45
45-35
65-80
Tube & Pipe Seamless
Annealed
70-85
25-45
50-35
75 max*

*The ranges shown are composites for various product sizes and therefore are not suitable for specification purposes. Hardness values are suitable for specification purposes provided tensile properties are not also specified.



Special recommendation
5052 Aluminium
SUP9 Spring Steel | 55CrMnA | 55Cr3 | 1.7176 | 527A60
7075-t6 aluminum pipe
5754 aluminium alloy
6061 T6/T651 ALUMINIUM PLATE
CuZn36Pb3 (CW603N) lead brass
CONTACT US
NO.501 Dongshe Road, Dongjing Town, Songjiang District, Shanghai,China,201600
Mobile/Whatsapp/Zalo/Lines/Skype:+8616628500844
Copyright@2018-2030 LUOYUE PRECISION METAL (SHANGHAI) CO., LTD