Alloy 400 / Monel 400 / N04400 / 2.4360
Monel 400, also known as Nicorros, is a nickel-copper, single phase curing alloy
with excellent corrosion resistance in a wide range of environments.
Monel (modifications MONEL 400, 401, 404, K-500, R-405) is a brand of the
Special Metals Corporation (USA).
Alloy 400 is characterized by a high degree of resistance to corrosion formation
in acidic and alkaline conditions, in sea salt water, in an atmosphere of high
humidity. Its feature and great advantage is the possibility of using it in
direct contact with fluorine and hydrogen fluoride, hydrofluoric acid. Alloy 400
is known for its resistance to neutral and alkaline salts. Monel 400's
composition allows the alloy to withstand direct contact with low concentration
acids such as hydrochloric and sulfuric. Chita
Alloy 400 is characterized by a high degree of resistance to corrosion formation
in acidic and alkaline conditions, in sea salt water, in an atmosphere of high
humidity. Its feature and great advantage is the possibility of using it in
direct contact with fluorine and hydrogen fluoride, hydrofluoric acid. Alloy 400
is known for its resistance to neutral and alkaline salts. Monel 400's
composition allows the alloy to withstand direct contact with low concentration
acids such as hydrochloric and sulfuric.
Physical properties
Density Monel 400 (weight) - 8.80 g / cm3
Thermal properties N04400
Monel 400, the properties of which make it possible to use an alloy with
hydrofluoric acid and fluorine, is actively used in the electrical field, in the
production of marine equipment, in the production of containers for the storage
and transportation of food products (including salts and alkalis). Elements for
medical equipment and devices are made from this alloy. In mechanical
engineering, instrument and aircraft construction, Monel 400 is used to produce
elements, pumping equipment parts, valves, impeller axles, springs, bushings,
etc.
Corrosion resistance
Nicorros 400 has excellent resistance to neutral and alkaline salts and has been
the standard material for salt production plants for many years.
Nicorros is one of the few standard materials that can be used in contact with
fluorine, hydrofluoric acid and hydrogen fluoride or their compounds.
The material is highly resistant to alkaline media. The behavior in seawater is
also excellent, in comparison with copper-based alloys with increased resistance
to cavitation. Nicorros® can be used in contact with dilute mineral acids such
as sulfuric acid and hydrochloric acid if they are in an airless environment.
Since the alloy does not contain chromium, corrosion can increase under
oxidizing conditions.
While Nickel 400 is considered resistant to stress corrosion cracking, tensile
cracks can still appear in the presence of mercury or in wet, ventilated
HF-napax. Under these conditions, stress relieving annealing is required.
Welding
Nicorros 400 is weldable by all conventional methods: TIG, TIG, plasma, manual
arc welding, MAG and SAW and submerged arc welding. For welding, the material
must be provided in a light annealed condition and free from scale, grease and
markings. Strict cleanliness should be observed during welding.
The following welding consumable is recommended:
Welding connection:
NicorrosS6530 FM60
W.-Nr. 2.4377
SG-NiCu30MnTi
AWSA5.14: ERNiCu-7
BS2901 NA35
For very high corrosive conditions, it is possible to select a welding material
from the NiCrMo group of alloys, if necessary, in consultation with the
manufacturer.
Nicrofer S 6020-FM 625
W.-Nr. 2.4831
SG-NiCr21Mo9Nb
Coated rod electrodes:
W.-Nr. 2.4366
EL-NiCu30Mn
AWSA5.15: ENiCu-7
Surfacing
NicorrosnS6530 WS60
W.-Nr. 2.4377
UP-NiCu30MnTi
Main features and advantages of the alloy:
Corrosion resistance in seawater and chemical plants;
Free from stress corrosion cracking;
Good mechanical properties up to temperatures of about 550 กใ C (1020 กใ F);
Approved for autoclaves with wall temperatures between -10 and + 425 กใ C (14800
กใ F) according to VdTOV material description 263 and up to 900 กใ F (480 กใ C)
according to ASME "Boiler and Pressure Shipping Code";
Good workability and weldability.
Spheres of use of the alloy:
Feed water and steam generator pipes in power plants;
Heater and evaporator of salt in seawater desalination plants;
Sulfur and hydrofluoric acid alkylating plants;
Heat exchangers in the chemical industry;
Plating components for oil distillation plants;
Sheathing of sprayer zones on offshore platforms;
Travel wheels and pump shafts in seawater installations;
Uranium purification and isotope separation plants for nuclear fuel production;
Industrial pumps and valves;
Plants for the production of ethylene perchlorate and chlorinated
กก