Monel 400 Pipe
Steel Pipe & Tubes has been a leading supplier of Monel piping solutions.
Monel 400 Pipe Manufacturer in India and UNS N04400 Seamless Pipe and Alloy 400 ERW Pipe Supplier
Stellar Alloys is a reputed manufacturer, supplier and exporter of Monel 400 Pipe, UNS N04400 Seamless Pipe, Monel 400 Tube and Alloy 400 ERW Pipe with good presence in Indian and international market. Having over twenty five years experience in the manufacture of nickel alloy, we provide high performance seamless and welded Monel 400 piping products to withstand long term performance in the marine, offshore, chemical and high temperature service conditions.
Our Monel 400 products are manufactured under ASTM B165, ASTM B725, ASME SB165 SB725 as well as other DIN and EN specifications, and fully comply with international project requirements. The Monel 400 Seamless Pipe, Monel 400 Welded Pipe and Alloy 400 ERW Pipe are made of premium grade nickel copper alloy which has outstanding seawater, brackish water, neutral salts and a broad spectrum of chemical media resistant qualities. This contributes to making our piping a perfect application in marine engineering, desalination equipment, petrochemical units, refinery equipment, heat exchanger, boilers, and aerospace assembly where corrosion resistance and dimensional stability is required.
Our certified ISO and PED plants boast of high extrusion, pilgering, welding and heat treatment lines with in-house laboratories to conduct hydrostatic testing and ultrasonic testing, radiographic testing and a positive material identification facility. Each Monel 400 Pipe batch shipment is accompanied with standardized documentation such as EN 10204 3.1 and 3.2 Mill Test Certificates, heat numbers and traceability reports, which give confidence to both EPC contractors and oil and gas consultants and global procurement teams.
Stellar Alloys also offers high strength versions like Monel K500 Pipe which is used in cases where the strength is to be high, tensile performance is to be enhanced as well as in tougher situations. The two grades can be easily compared by the clients to choose the better one in the pumps, shafts, fasteners, high pressure systems and long offshore exposure.
Backed with stable export network, price competitiveness, stringent dimensional tolerance and on-time delivery, Stellar Alloys is a company of choice by companies requiring reliable Monel 400 Seamless Pipe, Monel 400 Tube, UNS N04400 Tubing and Alloy 400 ERW Pipe as essential components in their critical operations.
Understanding Monel 400 Pipe and UNS N04400 Tubing
Monel 400 pipes and tubes are produced using high performance nickel copper alloy that is valued to have a great strength, durability and resistance to a very broad range of corrosive conditions. This alloy is known as UNS N04400 and WNR 2.4360 and is a mixture of approximately sixty three percent nickel and twenty eight to thirty four percent copper that is precisely supplemented by iron and manganese and other trace elements. It is this balanced chemical structure that makes Monel 400 Pipe suitable to do duty in aggressive service environments where a large number of the stainless steels and common nickel alloys fail to sustain long term service.
As part of the ASTM B165, ASTM B725, ASME SB165 and ASME SB725, Monel 400 Seamless Pipe and Monel 400 Welded Pipe are produced in a manner that guarantees their dimensional stability, mechanical integrity and material consistency. Seamless pipes are made by the processes of hot extrusion and cold drawing which offers high level of accuracy, surface finish and pressure holding capacity. Control welding is used to produce welded pipes with larger diameter and provides a cost effective solution that does not affect the corrosion resistance. UNS N04400 Tubing is available with a large variety of outside diameter and wall thickness to satisfy the needs of high pressure applications and precision instrumentation.
One of the essential benefits of Monel 400 Pipes and Tubes is that it is tough and preserves mechanical strength over a wide temperature that spans a cryogenic temperature to about five hundred degrees Celsius. The alloy also has a good fabrication and welding properties, which provide easy forming, machining and joining in the course of installation. These qualities have predisposed Monel 400 Pipe and Tube as a good solution in the challenging environment like marine systems, desalination stations, chemical processing systems, refinery piping, heat exchangers, power generation plants and off shore structures where corrosion resistance and longevity are important.
Types of Monel 400 Seamless and Welded Pipe
Monel 400 is available in several forms of pipes and tubes, each designed to meet specific operational requirements. The table below summarizes the major types along with their characteristics and typical applications.
UNS N04400 Square Pipe
Alloy 400 Decorative Pipe
Monel Alloy 400 Round Pipe
Nickel Alloy 400 Hollow Pipe
Nicorros 400 Rectangular Pipe
AMS 4574 Annealed Pipe
WNR 2.4360 Thick Wall Pipe
UNS N04400 Cold Finished Pipe
Alloy 400 Hot Finished Pipe
Monel 400 Pipe Specifications
To meet diverse industrial requirements, Monel 400 Pipes and Tubes are manufactured under strict international standards with precise dimensional accuracy and controlled chemical composition. The specifications below highlight the commonly supplied forms, sizes, and finishes offered by Stellar Alloys.
| Standard | ASTM B165 / ASTM B725 / ASME SB165 / SB725 |
| Grade | Monel 400 / UNS N04400 / WNR 2.4360 |
| Type | Seamless, Welded, ERW, Fabricated |
| Size Range | ½” to 24” NB (custom available) |
| Form | Round, Square, Rectangular, Hydraulic, Bush, Hexagonal |
| Length | Single Random, Double Random, Cut Length |
| Ends | Plain End, Beveled End, Threaded |
| Surface Finish | Annealed, Pickled, Polished, Bright Annealed |
Available Size Range of Monel 400 Pipes
Monel 400 Pipes and Tubes are supplied in a variety of diameters, wall thicknesses, and lengths to suit different project requirements. The table below provides a quick overview of the commonly available size ranges.
| Product Type | Size Range | Wall Thickness (WT) | Length |
| Seamless Pipes | ½” NB to 8” NB | 0.5 mm – 20 mm | Up to 12 m (custom cut available) |
| Welded Pipes | ½” NB to 24” NB | 0.5 mm – 20 mm | Single / Double Random, Cut Length |
| Seamless Tubes | OD 6.35 mm – 114.3 mm | 0.5 mm – 12 mm | Up to 12 m |
| Welded Tubes | OD 6.35 mm – 168.3 mm | 0.5 mm – 20 mm | Standard & Custom Lengths |
ASTM B165 UNS N04400 Tube Dimensions & Thickness Chart
Monel 400 Tubes are manufactured in a wide range of outside diameters (OD) and wall thicknesses (WT) to meet ASTM B165 standards. The following chart shows some of the most commonly supplied dimensions for seamless and welded tubes.
| OD (mm) | WT (mm) | OD (inch) | WT (inch) |
| 6.35 | 0.89 | 0.25 | 0.035 |
| 12.70 | 1.65 | 0.50 | 0.065 |
| 19.05 | 2.11 | 0.75 | 0.083 |
| 25.40 | 2.77 | 1.00 | 0.109 |
| 38.10 | 3.40 | 1.50 | 0.134 |
| 50.80 | 3.91 | 2.00 | 0.154 |
| 76.20 | 5.16 | 3.00 | 0.203 |
| 101.60 | 5.74 | 4.00 | 0.226 |
Pressure Ratings of ASTM B165 Monel 400 Square Pipes
The working pressure of Monel 400 Square Pipes depends on size, wall thickness, and whether the pipe is seamless or welded. The table below shows indicative pressure ratings at 38 °C (100 °F) for commonly used dimensions.
| Side × WT (mm) | Working Pressure – Seamless (bar) | Working Pressure – Welded (bar) |
| 25 × 2.0 | 380 | 325 |
| 50 × 3.0 | 260 | 220 |
| 75 × 5.0 | 430 | 370 |
| 100 × 6.0 | 510 | 440 |
Monel UNS N04400 Hollow Pipe Pressure Ratings
Monel 400 hollow pipes are used in high-pressure environments such as oil & gas, chemical processing, and marine applications. The pressure rating depends on pipe diameter, wall thickness, and whether the pipe is seamless or welded. The table below provides indicative working pressures at 38 °C (100 °F).
| OD × WT (mm) | Seamless Pressure (bar) | Welded Pressure (bar) |
| 40 × 2.5 | 290 | 250 |
| 60 × 4.0 | 410 | 350 |
| 80 × 5.0 | 520 | 460 |
Weight Chart of WNR 2.4360 Rectangular Pipes
The weight of Monel 400 (WNR 2.4360) rectangular pipes varies based on size and wall thickness. Knowing the weight per meter helps in accurate project planning, freight estimation, and structural load calculations. Below is an indicative weight chart for common sizes.
| Size (mm) | Wall Thickness (mm) | Weight (kg/m) |
| 40 × 20 | 2.0 | 2.15 |
| 60 × 40 | 3.0 | 4.90 |
| 100 × 50 | 5.0 | 12.10 |
ASME SB725 Alloy 400 Hexagonal Pipe Characteristics
Find below the detailed specifications of ASME SB725 Alloy 400 hexagonal pipes characteristics highlighting material grade, sizes, finishes and typical applications:
| Parameter | Specification / Range |
| Material Grade | Monel 400 / Alloy 400, UNS N04400, W. Nr. 2.4360 |
| Product Form | Hexagonal pipe / Hex nipple (machined from SB725 pipe or hex bar) |
| Size Range | 1/4″ – 4″ NPS; custom AF (Across Flats) sizes on request |
| Wall Thickness | Schedule 10S – Schedule 80S |
| End / Threads | NPT / BSPT male & female, bevel, plain; custom PE / BE blanks |
| Finishes | Bright annealed, pickled, polished |
| Standards | ASME SB725 for pipe; threads per ASME B1.20.1 / ISO 7/1 |
| Testing / Inspection | Hydro test, thread-gauge checks, PMI; documentation on request |
| Typical Uses | Instrumentation tie-ins, chemical dosing lines, high-temp headers, OEM skids; compact, wrench-friendly hex profile |
| Notes | Hex sections are short machined parts, not continuous mill-made; confirm AF, thread, pressure class before manufacture |
HSN Code of Monel 400 Seamless Pipe
For international trade and customs classification, Monel 400 Seamless Pipes are categorized under specific Harmonized System of Nomenclature (HSN) codes. This helps in standardized identification, taxation and global commerce. The table below provides the relevant HSN code details:
| Product | HSN Code | Description |
| Monel 400 Seamless Pipes | 75071200 | Nickel-copper alloy pipes and tubes, seamless, of nickel content >99% |
Physical Properties of DIN 2.4360 Square Pipes (Annealed Condition)
Monel 400 (WNR 2.4360) square pipes, when supplied in the annealed condition, demonstrate a combination of high strength, ductility and thermal stability. The table below highlights the key physical properties that make them suitable for use in demanding marine, chemical and power generation environments:
| Property | Value |
| Density | 8.80 g/cm³ |
| Melting Range | 1300–1350 °C |
| Elastic Modulus | 179 GPa |
| Electrical Resistivity | 5.47 µΩ·cm |
| Magnetic Permeability | 1.002 (slightly magnetic) |
Temperature Range of UNS N04400 Welded Pipe
Monel 400 welded pipes can operate reliably across a wide temperature spectrum, from sub-zero cryogenic conditions to elevated service environments. Their ability to retain mechanical strength and corrosion resistance makes them suitable for diverse industrial applications such as marine systems, chemical plants, and heat exchangers. The table below provides the indicative service temperature range:
| Condition | Service Temperature Range |
| Minimum Operating Temp. | −100 °C |
| Maximum Operating Temp. | +500 °C |
| Recommended Application Use | Cryogenic to moderately high-temperature service |
Stress Rupture Properties of Monel 400 Bright Annealed Pipes
Monel 400 bright annealed pipes are designed to retain their strength and ductility under long-term exposure to elevated temperatures and stress. Stress rupture testing helps determine the time-to-failure of the material under constant load and temperature, ensuring safe design for high-temperature applications. The table below highlights typical stress rupture values.
| Temperature (°C) | Applied Stress (MPa) | Rupture Life (hours) |
| 400 | 100 | 1000 |
| 500 | 80 | 500 |
| 600 | 60 | 200 |
Testing & Quality Standards for Nickel Alloy 400 ERW Pipes
To ensure that Nickel Alloy 400 ERW pipes meet the highest industry standards, a comprehensive testing and quality assurance program is implemented. The following checks and inspections guarantee structural integrity, material compliance and defect-free performance for critical applications:
- Hydrostatic Test: Pipes are filled with pressurized water to check their ability to withstand internal pressure without leakage. This ensures the structural integrity of the pipe under working conditions. It is one of the most reliable methods to guarantee safe performance in high-pressure service.
- Ultrasonic Testing (UT): High-frequency sound waves are passed through the pipe walls to detect internal flaws. The reflections are analyzed to identify cracks, voids, or inclusions that may weaken the pipe. This method is non-destructive and provides precise results without affecting pipe usability.
- Eddy Current Test: An electromagnetic field is applied to the pipe surface to locate cracks and near-surface defects. Variations in the induced current highlight imperfections in conductivity or material uniformity. It is a rapid quality control method, especially effective for ERW pipes.
- Radiography Test (RT): X-rays or gamma rays are used to examine welded joints for porosity, inclusions, or lack of fusion. The radiographic image clearly displays hidden weld defects that could compromise strength. This test ensures weld seams meet stringent international standards.
- Positive Material Identification (PMI): Specialized analyzers check the chemical composition of the alloy against UNS N04400 requirements. This prevents material mix-ups during production and confirms nickel-copper ratios. It ensures full compliance with client specifications and international codes.
- Third-Party Inspection (TPI): Reputed agencies such as SGS, Lloyd’s, or Bureau Veritas verify the pipes independently. They cross-check dimensions, material test certificates, and quality documentation. This adds an additional layer of trust and credibility for global buyers.
Most Popular Types of Monel 400 Alloy Pipes
The Monel 400 alloy pipes come in different types and product forms, which are used to make different products for various industries. The categories have some most commonly used types of this material, like Monel 400 and UNS N04400 Tubes, with many applications and performance advantages.
Monel 400 alloy pipes are manufactured in various product forms which are supposed to serve certain performance needs of industries. The following categories identify the most frequently supplied types of Monel 400 Pipe and UNS N04400 Tube characteristics, their applications and benefits of usage.
Monel 400 Seamless Pipe and Monel 400 Welded Pipe
The Monel 400 Seamless Pipe is made by the controlled extrusion and cold drawing methods that ensure high strength, even wall thickness and leak proof performance. High pressure systems, critical flow lines, marine water handling equipment, and chemical processing units where dimensional stability and long term durability are crucial are the ones that use seamless pipes.
The Monel 400 Welded Pipe is made by welding the metal through the most sophisticated welding technology to fit larger diameters and tailored lengths but with high resistance to corrosion. Welded pipes can be used to provide cost effective solution to structural use, utility lines, moderate pressure application in refineries, petrochemical plants and power generation facilities.
Monel 400 ERW Pipe
Monel 400 ERW Pipe is produced through electric resistance welding process and it provides uniformity of wall thickness, interior surfaces and good dimensional accuracy. These pipes are lightweight, easy to install and suitable in medium pressure system, structural supports, HVAC units and general utility piping. They can perform well in the industrial settings that necessitate corrosion resistance, but not at high pressure, which is their balance of the performance and affordability.
Monel 400 Fabricated Pipe
The Monel 400 Fabricated Pipes are fabricated to follow specifications of project details (bending, forming, cutting, or special welding). The pipes are popular in sophisticated industrial applications like refinery heaters, power plant equipment, offshore vessels, skid assemblies and marine systems which require custom geometry or special end construction.
Monel 400 Heat Exchanger Tubes
Monel 400 Heat Exchanger Tubes are offered with high thermal conductivity and excellent corrosion resistance in heat transfer systems that are based on seawater and are chemically aggressive. The tubes are popular in condensers, evaporators, coolers, and brine handling systems because they have long service life, are pitting resistant and have fewer service requirements.
Monel 400 Condenser Tubes
The Monel 400 Condenser Tubes are designed to meet thermal power plant, desalination units, chemical industries and marine condensers that have to deal with hot vapors, steam and corrosive condensate. The tubes are very resistant to stress corrosion cracking, thermal fatigue and high velocity water flow and they are safe and can operate continuously with the changing cycle of temperatures.
Monel 400 Instrumentation Tubes
Monel 400 Instrumentation Tubes are Instrumentation Tubes that are precision tubes which are used in control systems, measuring instruments and pressure monitoring units. They have repeatable tolerances and are also fined off with great surface finish and dependable performance in corrosive, high pressure and offshore environments. They are also perfect in petrochemical instrumentation, refinery analyzers and process automation systems due to their level of stability.
Monel 400 High Pressure Seamless Pipe
The Monel 400 High Pressure Seamless Pipes are fabricated to operate in extremely high working pressures and high operating environment requirements. These pipes are produced to very fine tolerances and are commonly used as oil and gas exploration, undersea assemblies, defense equipment, pressure vessels and other systems where safety, strength and reliability are important.
Specification Sheet of Monel 400 Bush Hex Pipes
Monel 400 Bush Hex Pipes are widely used in industries that require a combination of strength, corrosion resistance, and machinability. Their hexagonal form provides added grip and structural versatility, making them suitable for fittings, fasteners, and custom components. The table below outlines the key specifications.
| Parameter | Value |
| Material | Nickel-Copper Alloy 400 |
| Standard | ASTM B165 / ASTM B725 |
| Grade | UNS N04400 / WNR 2.4360 |
| Shape | Hexagonal / Bush Form |
| Surface Finish | Bright Annealed, Pickled, Polished |
| Lengths Available | Single Random, Double Random, Custom Cut |
| End Finish | Plain End / Beveled End / Threaded |
Why Choose Stellar Alloys for Monel 400 Pipes & Tubes?
Stellar Alloys is committed to providing high quality Monel 400 Pipes and Tubes that would meet high standards of performance and safety requirements of the industries of the world. The clients all over the globe have confidence in our nickel alloy products because they are precision engineered and reliable, consistent and technically sound.
- Two Decades of Expertise :
Having over two decades of concentrated experience within nickel alloys, we know what functional and engineering requirements are in the critical service environments. Our staff liaise with the design engineers and procurement experts to suggest the most appropriate solutions of Monel 400 Pipe and UNS N04400 Tube that assure reliable performance as well as extended life span. - Certified Manufacturing :
We have our production plants under ISO 9001 certifications, PED and ISO 14001 certifications and stringent quality control of each of our production phases. Monel 400 pipes and tubes are produced through controlled processes to ensure global standards of international quality and safety in terms of mechanical, chemical and dimensional requirements, providing full confidence of quality and safety of the products. - Comprehensive Range:
Our product range includes Fabricated ERW, Welded Monel 400 Pipes of round, square, rectangular and hexagonal profile. High choices of sizes, thickness and tailor made enable buyers to get all their requirements under one, trusted supplier thereby minimizing complexity of the project and lead times. - Global Export Capability:
We have export business in Middle East, Europe, Asia and North America whereby we have reliable logistics partners who will deliver in good time and in good condition. This would make Stellar Alloys a reliable one-stop solution in both large scale purchases and project supply in a variety of industrial applications. - MTC and Documentation:
Each shipment will be with full documentation of EN 10204 3.1 and 3.2 Mill Test Certificate and optional third party inspection report. Complete traceability and test records give buyers assurance of authenticity of materials and compliance with codes. - Custom Solutions:
We also provide cut to length supply, specified surface finishes and protective export packaging on the use of marine and offshore. The clients are also able to demand project specific alteration in order to minimize onsite fabrication and simplify installation. Such custom-made solutions render Stellar Alloys an ideal collaborator to EPC contractors and international procurement teams.
Monel Alloy 400 Tube Chemical Composition
| Grade | Ni | C | Al | Mn | Si | Fe | Cu | S |
| Monel 400 | 63.0 min | 0.3 max | 0.50 max | 2.0 max | 0.5 max | 1.0 – 2.5 | 28.0 – 34.0 | 0.02 max |
Monel 400 Tubing Mechanical Properties
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.8 g/cm3 | 1350 °C (2460 °F) | Psi – 35,000 , MPa – 240 | Psi – 80,000 , MPa – 550 | 40 % |
High Temperature Equivalent Grades for Monel 400 Seamless and Welded Tube
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST |
| Monel 400 | N04400 | 2.4360 | NU-30M | NiCu30Fe | NW 4400 | NA 13 | МНЖМц 28-2,5-1,5 |
Alloy 400 Tubing Physical Properties
| Properties | Metric | Imperial |
| Density | 8.8 gm/cm3 | 0.318 lb/in3 |
Frequently Asked Questions About Monel 400 Pipe
The application of Monel 400 is in marine, seawater handling, desalination plants and chemical processing, oil and gas equipment, heat exchangers and high temperature service lines. Its resistance to corrosions and mechanical strength depicts it as fit in the harsh and corrosive conditions.
Approximately sixty three percent nickel and twenty eight to thirty four percent copper mixed with minute quantities of iron, manganese, silicon and other elements compose Monel 400 pipe. This piece is a great corrosion resistant and durable piece in marine and chemical services.
Monel 400 has a much greater resistance to seawater, acidic media and alkaline conditions than stainless steel 316. It works in brackish water, hydrofluoric acid service and high temperature service whereas 316 is cheaper but does not work in highly corrosive or high chloride environments.
Monel 400 pipe is high performance nickel and copper alloy pipe, which is used in industrial conditions involving heavy work. It is available in seamless and welded shapes as per ASTM B165 and ASTM B725 requirements and finds large application in seawater services, chemical units and refinery piping systems.
Monel 400 pipe is high performance nickel and copper alloy pipe, which is used in industrial conditions involving heavy work. It is available in seamless and welded shapes as per ASTM B165 and ASTM B725 requirements and finds large application in seawater services, chemical units and refinery piping systems.
Yes, Monel 400 has an excellent corrosion resistance in salty water, brackish water and neutral salts, alkaline environment and most acidic conditions. It is also a good pitting and stress corrosion cracking and high velocity water flow resistant material.
The monel 400 pipe is capable of working in cryogenic temperatures to the tune of one thousand degrees Fahrenheit. It retains mechanical strength and toughness throughout this wide range of temperature, which is why it can be used in heat exchangers, boilers and in high temperature chemical processing.
EN 10204 3.1 or 3.2 Mill Test Certificate is supplied with Monel 400 seamless and welded pipes along with hydrostatic test, ultrasonic test and PMI reports where necessary. All industrial and project based applications are fully traceable.
