Monel 400 Tubes Manufacturer & Supplier
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Midland Alloys Inc. is a leading manufacturer and exporter of Monel 400 Tubes, with its headquarters located in Mumbai, India. These tubes have exceptional resistance to seawater, acids and alkalis because they are made of the nickel copper alloy Monel UNS N04400. They are ideal for demanding marine, chemical, and industrial environments. This page includes essential details—ASTM B165 and ASME SB 163 specifications, types (seamless, welded, coiled), pressure ratings, sizes, and chemical composition. We supply globally compliant tubes with custom dimensions, precise tolerances, and test certifications. Explore below to choose the right Monel 400 tubing for your needs.
What is Monel 400 Tube?
Monel 400 Tube is made from UNS N04400, a solid-solution alloy of nickel and copper. It stands out for its excellent corrosion resistance in seawater, acidic, and alkaline environments. Monel 400 functions dependably in the face of extreme pressure and temperature because of its strong mechanical qualities and high ductility. It is a sensible option for crucial system since it also provides good weldability and resist stress corrosion cracking. These tubes are utilized in heat exchangers, condensers, chemical plants, and oil and gas pipelines—industries where performance and longevity are essential. Engineers use this material when they are working in challenging conditions.
Advantages of Monel 400 Tube (UNS N04400)
Monel 400 Tubes deliver a powerful mix of strength, corrosion resistance, and reliability—making them ideal for harsh and high-demand industrial environments. Below are the advantages of out monel UNS N04400 tube:
- Excellent corrosion resistance in saltwater, hydrofluoric acid, sulfuric acid, and alkaline media
- High mechanical strength with dependable performance in tough operating environments
- Maintains stability under high pressure and sub-zero temperatures
- Offers non-magnetic properties, ideal for precision instrumentation
- Resists stress corrosion cracking, even in chlorinated or acidic conditions
- Strong thermal conductivity, suitable for heat transfer applications
- Long service life in aggressive marine and chemical industries
Monel 400 Tubes vs Other Grades
Monel 400 tubes offer superior corrosion resistance in harsh marine and chemical environments compared to stainless steel. While stainless steel is cost-effective, Monel 400 performs better in acidic and chloride-rich settings. Compared to Inconel, Monel 400 is ideal for moderate temperatures and reducing conditions, whereas Inconel is preferred for high-temperature applications like aerospace and turbines due to its excellent heat resistance.
Monel 400 Tubes Specifications
Seamless Tube OD : 1/8 -12" NPS
Welded Tube OD : 6.00 mm OD up to 914.4 mm OD
EFW Tube Size : 6 mm OD x 0.7 mm to 50.8 mm OD x 3 mm thk.
ASTM B163 / ASME SB163, ASTM B730 / ASME SB730
Seamless / Welded / ERW / Fabricated / CDW / 100% X Ray Welded
Square, Rectangular, Round, etc.
Single Random, Double Random, Cut to length
Screwed, Beveled, Threaded, Plain
SCH XS, SCH 40, SCH 80S, SCH 5, SCH 80, SCH XXS, SCH 160, SCH10, All Schedules
No. 2B - Mill finish/ Matte finish, No.8 - Mirror finish, No. 4 - Brushed finish, Bright, Annealing, Polished, Mirror
Available Types of Monel Alloy 400 Tubes
To meet a variety of industrial needs, we provide a large selection of Monel 400 tubes in various forms. Custom diameters, lengths and surface finishes are offered for all varieties.
Manufacturing Types
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Seamless TubesPreferred for high-pressure, leak-proof systems in chemical and offshore industries
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Welded TubesSuitable for general-purpose piping, heat exchangers, and low-to-moderate pressure applications
Pipe Forms
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Capillary TubesIdeal for precision flow control in lab and medical equipment
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Coiled TubesUsed in hydraulic lines, heat exchangers, and instrumentation systems
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Instrumentation TubesDesigned for high-accuracy measurement and control systems
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Heat Exchanger TubesUsed in condensers, boilers, and thermal transfer units
Contact us today to discuss how Monel 400 Tubes can benefit your application. Whether you need guidance in selecting the right Tubes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr |
| Monel 400 | 0.30 max | 2.00 max | 0.50 max | 0.24max | 28.0-34.0 | 2.50 max | 63.00 min | – |
| Element | Density | Melting Range | Tensile Stress | Yield Stress (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 % |
| NPS | OD | Weight | Weight | |
|---|---|---|---|---|
| in | mm | Lb/ft | kg/Mtr | |
| 1/2 | 0.840 | 21 | 0.851 | 1.268 |
| 3/4 | 1.050 | 27 | 1.131 | 1.684 |
| 1 | 1.315 | 33 | 1.679 | 2.501 |
| 1 1/4 | 1.660 | 42 | 2.273 | 3.385 |
| 1 1/2 | 1.900 | 48 | 2.718 | 4.048 |
| 2 | 2.375 | 60 | 3.653 | 5.441 |
| 2 1/2 | 2.875 | 73 | 5.793 | 8.629 |
| 3 | 3.500 | 89 | 7.576 | 11.284 |
| 4 | 4.500 | 114 | 10.790 | 16.073 |
| 6 | 6.625 | 168 | 12.924 | 19.252 |
| 8 | 8.625 | 219 | 16.940 | 25.233 |
| 10 | 10.750 | 273 | 21.207 | 31.588 |
| 12 | 12.750 | 324 | 25.222 | 37.570 |
| 14 | 14 | 356 | 27.732 | 41.308 |
| 16” | 16 | 406 | 21.748 | 47.290 |
| 18 | 18 | 457 | 41.588 | 61.948 |
| 20 | 20 | 508 | 52.733 | 78.547 |
| 24 | 24 | 610 | 63.413 | 94.456 |
| 30 | 30 | 762 | 79.433 | 118.318 |
| 36 | 36 | 914 | 95.453 | 142.180 |
| 42 | 42 | 1067 | 138.911 | 206.914 |
| 48 | 48 | 1219 | 190.738 | 284.112 |
Excellent pressure-handling capabilities are provided by Monel 400 tubes particularly in systems subjected to high temperatures, corrosive media or high stress. Operating temperature, wall thickness, and outer diameter (OD) all affect pressure ratings.
A typical pressure rating chart for Monel 400 tubes at room temperature (up to 100°F/38°C) is shown below:
| Tube O.D. (in.) | Wall Thickness of Tube (inches) | |||||||
|---|---|---|---|---|---|---|---|---|
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (psig) | ||||||||
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | |||
Monel 400 (UNS N04400) tubes, whether seamless or welded, are recognized under various international material standards. These equivalent grades give engineers and international procurement teams the confidence to specify and cross-reference Monel 400 across different regional codes and projects.
Below are globally accepted equivalents:
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN | |
| Monel 400 | 2.4360 | N04400 | NW 4400 | NA 13 | МНЖМц 28-2,5-1,5 | >
| NiCu30Fe |
| Wall Thickness | Monel 400 Tube Sizes ( O.D.) |
|---|---|
| .010 | 1/16″ , 1/8″ , 3/16″ |
| .020 | 1/16″ , 1/8″ , 3/16″ , 1/4″ , 5/16″ , 3/8″ |
| .012 | 1/8″ |
| .016 | 1/8″ , 3/16″ |
| .028 | 1/8″ , 3/16″ , 1/4″ , 5/16″ , 3/8″ , 1/2″ , 3/4″ , 1″ , 1 1/2″ , 2″ |
| .035 | 1/8″ , 3/16″ , 1/4″ , 5/16″ , 3/8″ , 7/16″ , 1/2″ , 16″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 2″ , 2 1/4″ |
| .049 | 3/16″ , 1/4″ , 5/16″ , 3/8″ , 1/2″ , 16″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/8″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 2″ , 2 1/4″ |
| .065 | 1/4″ , 5/16″ , 3/8″ , 1/2″ , 16″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 1 3/4″ , 2″ , 2 1/2″ , 3″ |
| .083 | 1/4″ , 3/8″ , 1/2″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 1 5/8″ , 1 7/8″ , 2″ , 2 1/2″ ,3″ |
| .095 | 1/2″ , 5/8″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ |
| .109 | 1/2″ , 3/4″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ |
| .120 | 1/2″ , 5/8″ , 3/4″ , 7/8″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ , 2 1/4″ , 2 1/2″ , 3″ |
| .125 | 3/4″ , 1″ , 1 1/4″ , 1 1/2″ , 2″ , 3″ , 3 1/4″ |
| .134 | 1″ |
| .250 | 3″ |
| .375 | 3 1/2″ |
Monel Tube Grades We Offer
Difference Between Monel Tubes and Inconel Tubes
Though Monel and Inconel both fall in the category of high-performance nickel alloys, they differ in their composition as well as application. Monel Tubes are nickel-copper alloys primarily designed for excellent corrosion resistance in marine and chemical settings, particularly where acids and alkalis are present. On the other hand, nickel-chromium-based Inconel tubes, like those composed of Inconel 600 or 625, are designed to withstand oxidation at high temperatures, which makes them perfect for use in heat-treatment, and aerospace settings. In mechanical terms, Inconel performs well in processes involving high heat and oxidation, while Monel provides superior corrosion resistance in seawater. Compared to Inconel, which maintains its strength even at high temperatures, Monel tubes are also more ductile and easy to work with at room temperature.
Monel 400 Seamless Tube Manufacturing Process
Midland Alloys manufactures Monel 400 seamless tubes using advanced, quality controlled processes to ensure dimensional accuracy and corrosion resistance. Each stage of the process is designed to meet international standards like ASTM B165.
- Drawing/Floating Process: To achieve precise wall thickness and refine inner diameter, the tube is floated or drawn over a mandrel.
- Continuous Seamless Tube Mills: High-capacity mills continuously shape and size the tubes while maintaining uniform structure and surface finish.
- Continuous Casting: For subsequent processing into seamless tubes, molten monel alloy is formed into billets or blooms.
- Annealing: To improve ductility and reduce internal stresses, tubes undergo controlled heat treatment.
- Sinking Process: Further reduces tube diameter without internal mandrels, improving wall finish and dimensional tolerance.
- Inspection and Testing: To guarantee adherence to Monel 400 requirements, each tube is subjected to stringent non-destructive testing (NDT), dimensional inspection, and pressure testing.
Round Bar
Analytic
Cut to Length
Centering
Heating
Perforation
Inspection of Size
Pickling
Inspection of Surface
Lubricating
Cold Drawing (Cold Rolling)
Degreasing
Annealing
Straightening
Cut
Pickling / Passivating
Inspection
Analytic
Marking
Packing & Shipping
Applications and Uses of Monel 400 Tubes
Monel 400 tubes are widely used in industries that demand superior corrosion resistance and strength. Because of their resistance to extreme temperature and harsh conditions, they are perfect for chemical processing, jet engine exhaust systems and the production of sour gas. These tubes function dependably under heat and stress in motor racing and aerospace. Because of its resilience in corrosive and radioactive environments, Monel 400 is also utilized in chimney linings and nuclear waste reprocessing equipment making it a material of choice for high-performance and critical applications.
Customization Options & Stock Availability
Midland Alloys Inc. provides customized Monel 400 tubes with tailored OD/ID dimensions, wall thicknesses, and lengths. Options include cut-to-length services, surface finishes like polished, annealed, or pickled, and end configurations such as plain, beveled, or threaded ends. In accordance with project specifications, we provide precise tolerances and finishing. We can handle both small and large orders because of our flexible MOQs. We have seamless and welded types of our ready stock, which spans from 1/8 NB to 30 NB in schedules SCH 5 to SCH XXS. Custom orders have a set production timeframe but in stock items can be shipped the same day.
One of the top exporters of Monel 400 tubes to international markets is Midland Alloys Inc., which has its headquarters in India. Because of the demand for oil and gas, we frequently supply to Gulf countries like the United Arab Emirates, Saudi Arabia, Oman, Qatar and Kuwait. Our footprint is expanding steadily throughout Asia-Pacific (Singapore, Malaysia, South Korea) and Europe (Germany, UK, France, Italy). We also serve South Africa, Egypt, Nigeria, Brazil, and other countries in Africa and Latin America.
We ensure that all Monel 400 Tubes meet international certifications and compliance standards for global acceptance. Our tubes are produced in compliance with ASTM B165 standards and, if necessary, come certified by EN 10204 3.1 or 3.2. Additionally, we meet PED/AD 2000 requirements for European markets and NACE MR0175/ISO 15156 standards for sour service applications.
Monel 400 Tubes from Midland Alloys Inc. are securely packed using export-grade materials to ensure damage-free transit. We use HDPE wrapping, shrink wrap, wooden boxes, and tube bundles with protective end caps, with the option for customised packaging per client specifications. Each package is clearly tagged with size, grade, heat number, and standards. We provide road and rail delivery throughout India, as well as international shipping via air and sea freight. With same-day dispatch for in-stock items and prompt delivery for custom orders, our team manages urgent, bulk, and project-based shipments.
Why Choose Midland Alloys Inc. for Monel 400 Tubes
One of India’s top producers and exporters of premium Monel 400 tubes is Midland Alloys Inc. Following ISO-certified procedures and ASTM/EN specifications, we are dedicated to precision manufacturing. In order to meet the specific needs of each project, our tubes are available in cut-to-length sizes, a variety of end finishes, customized schedules, and surface treatments. We serve customers in the Gulf, Europe, Africa and Southeast Asia because of a robust global supply network. Customers rely on us for prompt delivery, knowledgeable project assistance, and enduring alliances built on excellence and contentment.
FAQS
Alternatives include Inconel 625, Hastelloy C276, and Duplex stainless steels, depending on the application’s corrosion resistance and strength needs.
Yes, Monel 400 offers excellent long-term resistance to seawater corrosion, making it ideal for marine and offshore environments.
Standard lengths range from 6 meters (20 feet) to 12 meters (40 feet), with custom cut-to-length options available.
