Astec Tubes, located in Mumbai, India, is a leading manufacturer and supplier of Alloy Steel, Carbon Steel, Inconel, Stainless Steel, and other industrial piping products. Astec Tubes has built a solid reputation in the industry by supporting critical industrial projects with its extensive product offerings, nationwide distribution network, and a vendor base that uses only certified raw materials and advanced technology.
Monel 400 Pipe Fittings are designated as UNS N04400 and are a member of the nickel-copper alloys group, comprising a minimum of 63% nickel and 28% to 34% copper. This alloy composition gives the fittings a tensile strength of 550 MPa, yield strength of 240 MPa, and elongation of 40%. The fittings are manufactured to ASTM B366 / ASME SB366 standards and are dimensionally compliant with ASME/ANSI B16.9, ASME B16.28, and MSS-SP-43. Key performance characteristics include resistance to seawater corrosion, high mechanical strength at elevated temperatures, and excellent resistance to hydrofluoric acid and chloride stress corrosion cracking.
Monel 400 Butt weld Fittings
used in many chemical and engineering industries like chemical and hydrocarbon
processing equipment. Freshwater tank and also used in gasoline. There is much more
application where it is used likes in marine industries, oil and gas industries.
Monel pipe fittings are the most used pipe fittings techniques all over the world.
To ensure the quality and service of our products we
perform many different testing like micro and macro testing, flattening test, hardness
testing, pitting resistance test and many more. We also provide the best transportation of
our products. So that products can easily reach our customers without any damage.
Monel 400 Butt weld Elbow
Monel 400 Butt weld Cross
Monel 400 Butt weld Reducer
Monel 400 Butt weld Stub End
Monel 400 Butt weld Pipe Bend
Equivalent Grades of Monel 400 Pipe Fittings
Monel 400 Pipe Fittings carry different grade designations depending on the applicable international standard. The table below maps all equivalent identifiers across major global specifications.
| Standard |
Werkstoff Nr. |
UNS |
JIS |
BS |
GOST |
AFNOR |
EN |
| Monel 400 |
2.4360 |
N04400 |
NW 4400 |
NA 13 |
МНЖМц 28-2,5-1,5 |
NU-30M |
NiCu30Fe |
Have you any question or query
General Queries While Buying Monel 400 Pipe Fittings
Chemical Composition of Monel 400 Pipe Fittings
At Astec Tubes, every batch of Monel 400 Pipe Fittings is tested for composition to ensure the elemental percentage is within the required limits for UNS N04400. The table below displays the chemical composition.
| Grade |
C |
Mn |
Si |
S |
Cu |
Fe |
Ni |
| Monel 400 |
0.30 max |
2.00 max |
0.50 max |
0.024 max |
28.00 – 34.00 |
2.50 max |
63.00 min |
Mechanical Properties of Monel 400 Pipe Fittings
The structural performance of Monel 400 Pipe Fittings depends on consistent mechanical values across production lots. The table below confirms the physical and tensile parameters for this alloy grade.
| Element |
Density |
Melting Point |
Tensile Strength |
Yield Strength (0.2% Offset) |
Elongation |
| Monel 400 |
8.8 g/cm³ |
1350°C (2460°F) |
Psi – 80,000 / MPa – 550 |
Psi – 35,000 / MPa – 240 |
40% |
Types of Monel 400 Buttweld Fittings
Astec Tubes stocks and supplies Monel 400 Pipe Fittings in the following product forms, each manufactured to ASTM B366 and dimensional standards under ASME/ANSI B16.9:
UNS N04400 Buttweld Elbow
Monel 400 Pipe Elbow
Monel 400 Equal Tee
Monel 2.4360 Butt weld Cross
ANSI B16.9 Monel 400 Welded Elbow
Monel 400 Reducer Exporter
Monel 2.4360 Pipe Fittings
Monel N04400 Pipe Fittings
UNS N04400 Eccentric Reducer
Monel 2.4360 Concentric Reducer
Monel 400 Pipe Cap Supplier
JIS NW 4400 Buttweld End Cap
UNS N04400 Butt weld Fittings
Monel 400 Long Stub End
ASME SB366 Monel 400 Buttweld Bend
2.4360 Butt weld Fittings
UNS N04400 Pipe Fittings
Monel 400 Short Stub End Manufacturer
Monel 400 Pipe Bend
Monel 400 90 deg. Elbow Stockist
JIS NW 4400 Pipe Fittings Stockholder
ASTM B366 Monel 400 Welded Fittings
Monel 400 Seamless Fittings
Nickel Alloy 400 Pipe Fittings
Manufacturing Standards of Monel 400 Pipe Fittings
Manufacturers in India & Globally
| ASME B16.9 |
Factory-Made Wrought Buttwelding Fittings |
400 Monel Long Radius Elbows, Long Radius Reducing Elbows, Alloy 400 Long
Radius Returns, 400 Steel Short Radius Elbows, Monel 400 Short Radius
180-deg Rerurns, Monel 400 3D elbows, Straight Tees, Straight Crosses,
Reducing Outlet Tees, Reducing Outlet Crosses, Monel 400 Lap Joint Stub
Ends, Monel 400 Caps, Reducers |
| ASME B16.28 |
|
400 Monel Short Radius Elbows, Monel 400 Short Radius 180-deg Returns |
| MSS SP43 |
Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion
Resistant Applications |
Monel 400 Long Radius Elbows, Straight and Reducing-on-the-Outlet Tees, Lap
Joint Stub ends, 400 Monel 400 caps, long radius 180 Degree returns,
concentric reducers, eccentric reducers |
| Mss SP75 |
|
Monel 400 Long Radius Elbows, 3R elbows, straight tees, reducing outlet
tees, caps, 400 Monel reducers |
Industrial Applications of Monel 400 Pipe Fittings
Monel 400 Pipe Fittings serve demanding process environments where standard carbon steel or even stainless steel fittings fail to hold up. Below are the primary sectors where these fittings deliver long-term, reliable service.
Oil and Gas Processing
Monel 400 withstands hydrogen sulfide, brine, and crude oil contaminants without surface degradation. In subsea pipelines and offshore processing platforms, where chloride exposure is constant, these fittings maintain structural integrity at depths and temperatures that would cause stress corrosion cracking in lesser alloys.
Marine and Seawater Systems
Saltwater attacks most metals at an accelerated rate. Monel 400 holds corrosion rates below 0.025 mm/year in flowing seawater, making it the first choice for ship propeller shafts, pump shafts, desalination plant piping, and dock hardware. Astec Tubes supplies these fittings in sizes from 1/8" NB to 48" NB to cover the full scope of marine installations.
Chemical Processing Equipment
Hydrofluoric acid, sulfuric acid, and alkaline solutions all appear in chemical plant process streams. Monel 400 resists all three effectively, particularly hydrofluoric acid at concentrations up to 100%, where few other alloys survive without rapid pitting. Fittings in this grade see use in acid handling lines, neutralisation columns, and chemical reactors.
Power Generation
Steam turbine condensers, heat exchanger tube sheets, and brine heaters in power plants operate under high thermal load and corrosive water chemistry. A yield strength of 240 MPa and a melting point of 1350°C give Monel 400 fittings the thermal margin to handle these service conditions without creep or deformation over long operating cycles.
Pharmaceutical and Food Processing
Process cleanliness and resistance to organic acids matter in pharmaceutical manufacturing. Monel 400 will not leach harmful compounds into process streams and is resistant to common cleaning agents used in sanitary piping systems. Its smooth surface finish after fabrication also reduces microbial adhesion, which is critical in sterile process environments.
Pulp and Paper Industry
Bleaching chemicals including chlorine dioxide and sodium hypochlorite degrade most piping materials rapidly. Monel 400 pipe fittings resist these chlorine-based environments at elevated temperatures, making them a durable solution for digesters, bleach plant headers, and chemical feed lines within pulp mills.
Frequently Asked Questions
These fittings are used to join, redirect or transition piping in corrosive environments such as chemical plants, marine systems, oil refineries, and desalination facilities where normal steel fittings would give out.
Monel 400 offers tensile strength of 550 MPa, elongation of 40%, melting point of 1350°C and density of 8.8 g/cm3, with exceptional resistance to hydrofluoric acid and saltwater.
Yes. Monel 400 resists corrosion rates below 0.025 mm per year in seawater and is resistant to hydrofluoric acid, brine, alkaline solutions and chloride-bearing environments without pitting or stress cracking.
Oil and gas, marine engineering, chemical processing, power generation, pharmaceutical manufacturing and pulp and paper manufacturing all use these fittings in critical process piping applications.
Astec Tubes supplies elbows, tees, reducers, caps, crosses, stub ends, pipe bends, and lap joint stub ends in seamless, welded, and fabricated construction from 1/8" NB to 48" NB.
Specifications of Monel 400 Pipe Fittings
Astec Tubes manufactures Monel 400 Pipe Fittings in a comprehensive range of sizes, wall thicknesses and construction types to meet project specific requirements. The table below covers the complete specification range.
Standard :ASTM B366 / ASME SB366
Dimensions : ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Size : 1/8” NB TO 48” NB. (Seamless & 100% X-Ray Welded, Fabricated)
Thickness : Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS
Type : Seamless / Welded / Fabricated
Bending Radius : R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom