• Monel 400
  • Monel 400
  • Monel 400
  • Monel 400
  • Monel 400

Monel 400 Features

  • Good weldability and formability
  • Resistant to pitting and crevice corrosion
  • Low thermal expansion
  • High temperature strength
  • High thermal and electrical conductivity
  • Resistant to seawater
  • Non-magnetic
  • Low coefficient of friction
  • Low permeability
  • Easy to form and fabricate
  • Good dimensional stability

Leading Monel 400 Manufacturer in China – Tuolian

Tuolian Monel 400 also known as alloy 400. Contains 2/3 nickel and 1/3 copper, as well as a small amount of iron, manganese, carbon, & silicon. A unique alloy that boasts an impressive combination of strength, corrosion resistance, & durability. This nickel-copper alloy is known for its ability to withstand extreme temperatures up to 1000° C and with a 2370° – 2460° F melting point. Monel 400 is resistant to a variety of corrosive agents. That includes alkalis, acids, & seawater.  

At Tuolian, we manufacture Monel 400 in sheet, strip, tube, pipes, bar, forging stock, and wire, fittings, flanges forms. All sizes, shapes and thicknesses are available according to your request.

For your orders, please get in touch!

Monel 400

Monel 400 Sheet
Monel 400 Sheet
Monel 400 pipe
Monel 400 pipe
Monel 400 Bar
Monel 400 Bar
Monel 400 Rod
Monel 400 Rod
Monel 400 Strip
Monel 400 Strip
Monel 400 Coil
Monel 400 Coil
6 Products Found.

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Ultimate Guide to Monel 400: Composition, Properties, and Uses

Monel 400 is an alloy class with remarkable characteristics like its counterpart alloys. This alloy can be formed into various shapes and sizes, such as bars, rods, wires, flanges, etc.; each product of this alloy is immune to decay and other forms of deformation. Keep reading to learn more about Monel 400, its use cases, and how it differs from other alloy materials.

What Is Monel 400?

One feature that adds to the uniqueness of every alloy material is its chemical composition. While some alloys like Hastelloy have nickel and molybdenum as their main chemical elements, Monel 400 has nickel and copper. As the main alloying elements, they contribute the most to the material’s chemical composition but also receive support from other elements. 

 Monel 400

Since Monel 400 has a reasonable amount of copper in its chemical composition, it should pass as a copper-nickel alloy. But that isn’t the case because an alloy must have up to 60% copper to fit into this class. UNS N04400 retains its ductility and toughness at cryogenic temperatures, making it ideal for settings with high-temperature tolerance as a prerequisite. 

Monel nickel-copper alloy 400 can be easily fabricated and doctored into various forms and materials for daily industrial use, such as heat exchangers, valves, pumps, fasteners, and Monel 400 tubes. 

Properties of Monel 400

The Monel 400 material properties comprise its chemical composition,  physical properties, magnetic properties, and mechanical properties, measuring the ability of the alloy to withstand various mechanical stresses. This section highlights Monel 400 behavioral features with regard to various parameters and key properties.

1. Monel 400 Physical Properties

When talking about the physical properties of Monel 400, it is important not to leave out any relevant detail or parameters, such as Monel alloy 400 density, melting range, specific heat capacity, electrical resistivity, and its level of thermal energy conductivity. The table below throws more light on these properties and their occurring values.

Properties Values
Monel 400 Specific Heat Capacity 427 J/kg.K
Density 8.83 g/cm³
Melting Point 1300-1350°C (2372-2462°F)
Boiling Point 2460°C (4460°F)
Thermal Conductivity 21 W/m·K
Electrical Conductivity 34% IACS
Coefficient of Expansion 13.9 µm/m·°C (20-100°C)
Monel 400 Poisson’s Ratio 0.32

2. Monel 400 Chemical Composition

All the alloying chemical elements in Monel 400, no matter how little, contribute to the advantages it renders to users. For instance, the high volume of nickel in 400 Monel improves the alloy’s thermal stability, strength, corrosion resistance, and low magnetic permeability. Here’s an analysis of the chemical content of the 400 Monel.

Elements  Composition (%)
Copper 28 – 34
Iron Max 2.5
Manganese Max 2.0
Carbon Max 0.3
Silicon Max 0.5
Sulfur Max 0.024
Nickel Balance

3. Mechanical Properties of Monel 400

The Monel nickel-copper alloy 400 is ideal for processes with rust and heat resistance as a prerequisite. Keep reading to learn more about the Monel 400 mechanical properties.

Properties Value
Tensile Strength 550 – 800 MPa
Yield Strength 240 – 520 MPa
Elongation 35 – 60%
Modulus of Elasticity 179 GPa
Monel 400 Rockwell Hardness (C) HRB 65 – 80

4. Monel 400 Magnetic Properties

Regarding Monel 400 magnetic properties, it is known as a non-magnetic alloy, meaning it has a low magnetic permeability. The low magnetic permeability of Monel 400 makes it an ideal choice for applications where magnetic interference or detection needs to be minimized. 

It is commonly used in industries such as aerospace, electronics, and marine engineering, where magnetic fields can disrupt sensitive equipment or affect the performance of instruments. This property also makes 400 Monel suitable for magnetic resonance imaging (MRI) technology applications. 

Cold working and deformation are popular methods used to add magnetism to non-magnetic alloys. Manufacturers use these methods on the 400 Monel material to make it a little magnetic. However, this minimal magnetism can be mitigated through appropriate annealing or heat-treating Monel 400.

Available Monel 400 Products

The Monel 400 product you choose depends on your industrial or personal operation. Still, you don’t have to worry about getting one for your project because manufacturers make various designs to fit any production need. Some of the available forms of Monel 400 include.

  • Monel 400 Sheets: Monel 400 sheets/plates are flat, thin pieces of the Monel nickel-copper alloy. They are used in various industries due to their excellent resistance to decay and heat, magnetic reduction, and strength.
  • Monel 400 Pipes: These pipes are cylindrical hollow tubes. Like the sheets and other Monel 400 products, these pipes are highly resistant to deformation, hence their use in transporting liquids and gases in any environment. 
  • Monel 400 Tubes: These tubes have a small bore than Monel 400 pipes and are used in heat exchangers, condensers, and other applications with excellent rust resistance, and high thermal conductivity is a prerequisite. 
  • Monel 400 Rod: These solid cylindrical bars are leveraged for settings requiring deformation resistance, offering excellent mechanical properties, including high strength and good ductility.
  • Monel 400 Flat Bar: Monel 400 flat bars are rectangular-shaped bars with a flat surface. They have vast applications in structural settings, manufacturing components, and machinery parts. 

All Toulian Metal Monel 400 products offer excellent resistance to decay, are versatile, and exhibit great strength. So, contact them today if you are looking for a Monel 400 product that can be easily formed or fabricated into desired shapes or structures.

Monel 400 ASTM Specifications

Monel 400 ASTM specification outlines the requirements and standards for the chemical composition, dimension, and mechanical properties of Monel 400, specifying the percentage ranges for various elements and the mechanical properties present in the alloy. These ranges ensure that the alloy possesses the desired characteristics and performance.

Form Standard
Bar B164
Sheet B127
Tube B165
Monel Plate B127
Welded Pipe B165
Forging B564

Characteristics of Monel 400

When exploring the characteristics of Monel nickel-copper alloy 400, you will find that it is among the most ductile, strongest, and heat-resistant alloy classes. Still, these are only some of its features; let’s dive into more of the key features of Monel 400 chemistry.

Characteristics of Monel 400

  • Resistance to Various Corrosive Media: Monel 400 exhibits remarkable corrosion resistance, making it highly suitable for various applications with corrosion resistance as a major requisite. 

Various industries, including marine and chemical processing sectors, require alloy materials with high resistance to elevated temperatures. They utilize Monel nickel-copper alloy 400 due to its immunity to acids, salts, seawater, and other corrosive substances

  • Excellent Mechanical Properties: Monel 400 has high tensile strength, which means it can withstand heavy loads and maintain its structural integrity under significant stress. This strength makes it suitable for fasteners, pumps, valves, and other components subjected to intense mechanical forces.
  • Thermal Conductivity and Low Coefficient of Thermal Expansion: Not all alloy materials have the same level of heat resistance possessed by Monel 400. It can withstand high temperatures of up to 1200°C while maintaining its mechanical and structural integrity.
  • Resistivity to Oxidizing and Reducing Agents: The nickel-copper alloy has impressive oxidizing and reducing media resistance, and it remains stable and resists degradation even in high-temperature environments. This quality is particularly advantageous in industries where high temperatures and aggressive chemical environments are common, such as oil and gas processing.
  • Highly Fabricable: Monel 400 can be machined, welded, and fabricated using conventional techniques. Its ductility allows for intricate designs and precise manufacturing, making it suitable for applications that require complex components.

It doesn’t just end at its fabricability and resistance to oxidizing and reducing agents, this alloy material can retain its mechanical properties under extremely low temperatures below -130°F.

Grades of Monel 400

Grades of Monel 400 have slightly different responsibilities than Monel 400 but exhibit many similarities. The table below explores some commonly available grades and their industrial applications:

Monel 400 Grades Description Common Applications
Monel 401 Monel 401 has higher copper content. The high copper content improves corrosion resistance in certain environments, particularly against sulfuric acid.  Valves and pump manufacturing and marine applications.
Monel 404 Monel 404 contains a small percentage of silicon, and this addition enhances the alloy’s resistance to seawater corrosion and erosion. Monel 404 finds applications in marine equipment, pump shafts, and valves.
Monel 405 Monel 405 is a variation of Monel 400 with added sulfur. Including sulfur enhances the alloy’s machinability. Leveraged by sectors with excellent machining capabilities as a prerequisite. These industries usually have products such as fasteners and other components in the marine industry.
Monel 450 Monel 450 contains aluminum and titanium. This additional volume of chemical elements improves its strength. Suitable for applications involving elevated temperatures and aggressive environments.
Monel K-500 Monel K-500 contains aluminum and titanium, which are known to improve the chemical properties of any alloy material.  Pump shafts manufacturing, valve, and fasteners production.
Monel R-405 Unlike K-500, which contains added aluminum and titanium, Monel R-405 contains added sulfur. It also stands out because of its immunity to rust and easy workability. Like every other Monel alloy, R-405 is utilized for its strength against corrosion and its unique easy machining characteristic.
Monel 502 Like Monel 450 and K-500, 502 has additional aluminum and titanium, and as aspected, it offers improved strength and resistance to various corrosive environments. Valve production, pipes for passing chemical fluids, pumps, etc.

Fabrication and Machinability of Monel 400

You don’t have to worry about workability with Monel 400. It can be easily formed and shaped using standard techniques such as hot or cold working, bending, and forging. For welding, regular gas tungsten arc welding is utilized. However, some manufacturers may opt for this or other effective methods.

However, Monel 400 tends to form a heat-affected zone during welding, leading to localized changes in its properties. Therefore, proper welding techniques, including appropriate preheating and post-weld heat treatment, should be used to minimize these effects and ensure the integrity of the welded joints.

Fabrication and Machinability of Monel 400

Work hardening poses a severe issue for the Monel 400 machining properties. Manufacturers use sharp tools, feeds, coolant, and controlled heating and cooling rounds because the alloy is extremely strong and can reduce tool lifespan and decrease Monel 400 machinability.

While Monel 400 may present some challenges in fabrication and machinability compared to more easily machinable materials, it is still possible to work with this alloy effectively. With proper techniques, tools, and processes, manufacturers can achieve precise and accurate machining, allowing for the production of high-quality components and parts from Monel 400.

Applications of Monel 400

If you work in a sector where durability is paramount or own a company with such requirements, Monel 400 is the alloy material for you. Many industries leverage this alloy, including valves, sheets, and pumps. Monel 400 uses include but are not limited to the following:

  • Marine Industry: Monel 400 is used in this sector due to its resistance to decay caused by salt water. It is utilized in seawater valves, pump shafts, propeller shafts, and other components exposed to saltwater environments.
  • Chemical Processing: The 400 Monel is commonly used in reactors, heat exchangers, piping systems, and vessels handling concentrated acids during industrial operations.
  • Oil and Gas Industry: It is employed in this sector for its resistance to high temperatures and corrosive environments. It finds applications in valves and pump manufacturing. In addition, Monel 400’s resistance to hydrogen sulfide makes it suitable for sour gas environments.
  • Aerospace: Monel nickel-copper alloy 400’s ability to retain its mechanical properties at cryogenic temperatures makes it valuable in the aerospace industry. It is used in aircraft components, cryogenic storage tanks, and instruments operating in extreme temperatures.
  • Fasteners and Springs: The alloy has unmatched strength and resistance to rust and wear. These characteristics make it an excellent choice for fasteners, bolts, screws, and springs. Its durability ensures long-lasting performance and reliability.
  • Electrical and Electronic Components: While it is a good choice for rust-induced damage and aerospace, Monel 400 also conducts electricity. Therefore consumers can incorporate it into the electrical and electronic sectors. It is used in electrical connectors, switchgear, and components with a prerequisite for high conductivity and corrosion resistance.
  • Seawater Desalination: Monel 400 is employed in desalination plants used in evaporators and other equipment used in the sea. Its corrosion resistance and durability in high-salinity environments suit these applications.

Advantages of Monel 400

Just like they have exceptional applications, Monel 400 also offers certain advantages for numerous consumers and industries. Some benefits of the Monel nickel-copper alloy 400 include:

  • Excellent Corrosion Resistance: There is no discussion about alloy materials or Monel 400 without highlighting the level of its resistance to corrosive environments. Its immunity to these media makes it ideal for aggressive environments. 
  • High Strength and Durability: It possesses high tensile strength and maintains its structural integrity under significant stress. It is a robust and durable material, making it suitable for applications that require strength and reliability.
  • Good Thermal Conductivity: Heat transfer equipment manufacturers mostly enjoy this feature since they incorporate it in producing heat exchangers and other heat transmission equipment.
  • Wide Temperature Range: Monel 400 retains its mechanical properties over a high-temperature range, including cryogenic temperatures. It can withstand low temperatures of -130°F and high temperatures of up to 2000°F.

Limitations of Monel 400

While Monel 400 holds many benefits that make it ideal for several settings and industry applications, it has certain limitations hindering it from being the best alloy for some use cases. Here are some common disadvantages of the Monel 400:

  • Cost: Monel 400 is more expensive than other alloys due to its unique composition and desirable properties. The higher cost can be a limiting factor in certain applications where budget constraints are a concern.
  • Machinability of Monel 400: Monel 400 can be machined, but its high strength and work-hardening tendency can pose challenges. Special considerations and tools are often required to achieve optimal machining results and prolong tool life.
  • Heat-Affected Zone (HAZ) During Welding Monel 400: Monel 400 can form a heat-affected zone (HAZ) that may result in localized changes in its properties during welding. However, you can minimize these effects by using preheating and post-weld heat treatment.

Best Practices for Maintenance and Care of Monel 400

When it comes to maintaining and caring for Monel nickel-copper alloy 400, you must follow the best practices for prolonging the lifespan and performance of your 400 Monel material. Some precautionary measures include:

  • Regular Cleaning: Clean your Monel 400 often to remove any dirt, debris, or contaminants that can degrade its surface. Use a mild detergent or soap, warm water, and a soft cloth or sponge to clean the alloy, and avoid abrasive cleaners or materials that can cause surface deformation.
  • Keep Away From Hazardous Chemicals: If you want to prolong your Monel 400 lifetime, keep them off hazardous chemicals. Acidic solutions, strong alkalis, and chlorides can corrode the alloy, so be cautious when using such substances near your Monel 400.
  • Prevent Contact with Dissimilar Metals: Galvanic corrosion can occur when Monel 400 comes into contact with dissimilar metals in an electrolyte (such as moisture). To prevent this, it’s advisable to isolate your Monel 400 material from other metals through insulating gaskets and coatings or by maintaining adequate spacing between them.
  • Minimize Abrasive Wear: While Monel 400 has good resistance to wear, it’s essential to minimize abrasive contact with the alloy. Avoid using abrasive cleaning pads or tools that can scratch the surface. If abrasion is unavoidable in a particular application, consider using protective coatings or liners to reduce direct contact with the alloy.
  • Regular Inspections: Inspect Monel 400 often for signs of corrosion, pitting, or other damage. Early detection can help prevent further deterioration and facilitate timely maintenance or repairs. If you discover any issues with the Monel nickel-copper alloy, consult experts or manufacturers for guidance on the best action.

Safety Considerations When Working With Monel 400

Working with Monel 400 requires attention to safety to ensure the well-being of those involved and to prevent any potential hazards. Consider the following safety considerations when handling or working with Monel 400:

Safety Considerations When Working With Monel 400

  • Proper Ventilation: During Monel 400 casting, welding, cutting, or other processes that generate fumes or dust, ensure proper ventilation in the workspace. Adequate ventilation helps remove airborne particles and prevents the accumulation of potentially harmful gasses.
  • Personal Protective Equipment (PPE): Wear appropriate PPE, such as safety glasses, gloves, and personal protective clothing, to protect yourself from potential contact with sharp edges, hot surfaces, or chemical exposure. When selecting PPE, ensure it is based on the specific task and any associated risks.
  • Fire Safety: During Monel nickel-copper alloy 400 welding and other industrial applications, ensure you follow the necessary fire safety protocols and have your fire extinguishers close in case of a fire outbreak.
  • Handle Sharp Edges With Care: Some Monel 400 materials have sharp edges after fabrication or machining. Take care when handling the alloy to avoid cuts or injuries. Consider using gloves or other appropriate hand protection when necessary.
  • Appropriate Knowledge about Monel 400: Ensure that personnel working with Monel 400 are adequately trained and familiar with the proper handling and safety procedures specific to the alloy. This includes understanding the potential hazards, following industry guidelines, and staying updated on safety practices.

Who Is the Best Manufacturer of Monel 400

Toulian Metal is the best Monel 400 manufacturer that stands out through their unwavering commitment to superior quality, vast experience in working with Monel 400, and a comprehensive product range from sheets, plates, and bars to pipes, fittings, and wire, catering to diverse industries. 

Toulian prioritizes customer satisfaction, technical expertise, and timely delivery while adhering to industry standards and holding relevant certifications. They embrace innovation, sustainability, and responsible practices, solidifying their reputation as leaders in the Monel 400 and other stainless steel materials manufacturing industries.

Inconel 625 vs. Monel 400: Differences and Similarities

When considering Inconel 625 vs.Monel 400, you must assess the specific requirements of your intended application and workspace. This will help you select the most appropriate alloy for optimal performance and longevity. While you are at it, the table below highlights the differences and similarities between Inconel 625 and Monel 400.

Parameter Inconel 625 Monel 400 Similarities
Composition Nickel-Chromium-molybdenum alloy Nickel-Copper alloy Nickel-based alloys
Strength High Moderate Good mechanical strength
Corrosion Resistance Excellent Superior resistance in reducing environments Resistance to aggressive environments
Use Cases Hazardous chemical processing equipment, etc. Marine, chemical processing tools, etc. Industrial applications
Pitting/Crevice Corrosion Resistance Excellent Moderate Resistance to specific forms of corrosion
Resistance to Acids/Alkalis Good Excellent Chemical resistance
Stress-Corrosion Cracking Resistance Good  Good Protection against stress-related corrosion
Thermal Stability High High Retains properties under temperatures above 2000°F.

Alloy 400 vs. Monel 400: Differences and Similarities

When comparing Monel 400 vs. Alloy 400, you’ll find that they are the same alloy material used instead of the other. The main difference between Alloy 400 vs. Monel 400 lies in their conventional naming; this distinction primarily arises from suppliers or manufacturers using their proprietary names.

In terms of their applications, they are commonly used in marine engineering for components exposed to seawater and in the chemical processing industry, where resistance to corrosive environments is crucial. Also, they are used in producing hydrocarbon equipment and various other industrial applications.

What is the Difference Between Monel 400 and Monel K500

Monel 400 and Monel K500 have different chemical compositions and mechanical and physical properties. Here’s a tabular form highlighting the key differences between Monel 400 and Monel K500:

Parameter Monel 400 Monel K500
Composition Nickel-Copper alloy (67% Ni, 30% Cu) Nickel-Copper alloy (63% Ni, 30% Cu) with Aluminum (2.3%) and Titanium (0.35%) additions
Tensile Strength 483-621 MPa 1103-1379 MPa
Yield Strength 193-276 MPa 793-1034 MPa
Elongation 40-45% 15-20%
Corrosion Resistance Excellent Excellent
Applications Marine Engineering, Chemical Processing, Pump Shafts, Valve manufacturing, and Fasteners. Pump Shafts, Oil and Gas Industry Components, Valve and Pump Parts, Springs
Magnetism Non-Magnetic Slightly Magnetic
Age Hardening Not capable of age hardening Capable of age hardening

Monel 400 Welding Procedure

Many individuals can weld Monel 400; however, only a few can weld it to another steel efficiently. You can do it yourself or work with a professional to guide you through the entire process. If you consider welding Monel 400 to other alloys independently, these procedures will help you to achieve the desired result.

1. Welding Monel 400 to Carbon Steel

Monel 400 and carbon steel are not the same alloys. In fact, they are from different families and with unique compositions. So, if you are welding Monel 400 to carbon steel, one thing that will guarantee a successful weld is your familiarity with the process. Nevertheless, if you aren’t knowledgeable about the process, appropriate welding materials will be helpful. 

Manufacturers use GTAW or gas metal arc welding to ensure proper fusion and reduce or completely eradicate the risk of welding-induced cracking. Then clean both alloys and use a filler metal. 

Ensure the filler you are using is ideal for this combination. This will enable you to achieve a sound weld. It is advisable to use Nickel-based filler metals, such as Monel filler metal 60, for welding Monel 400 to carbon steel. They enable great compatibility in the chemical composition of the two alloys while giving you the desired result.

During welding, excessive heat can lead to distortion, while insufficient heat may result in incomplete fusion. Proper heat control and joint preparation techniques, such as preheating, can help ensure a strong and durable weld between Monel 400 and carbon steel.

Welding Monel 400 to Carbon Steel

2. Welding Monel 400 to Stainless Steel

When welding Monel 400 to stainless steel, you must do so in a controlled environment. To weld Monel 400 to stainless steel, select the appropriate welding technique offering good control over the welding process and facilitating the formation of a good joint.

Thoroughly clean the materials to remove any contaminants that could affect the quality of the weld. Degreasing and removal of surface oxides promote optimal adhesion and minimize the risk of defects in this welding process.

Use filler metals that can maintain the desired properties of the weld joint and ensure good fusion between dissimilar alloys and follow the heat control process in the previous welding method. 


1. Monel 400 Equivalent Material

Every industrial process requires specific alloys to achieve the purpose of their operations. While there is no alloy that can fit into Monel 400’s shoes, consumers and industries consider Monel 400 equivalent materials in the absence of Monel 400. Some of these alloys include the following:

  • AMS 4574
  • AMS 4731
  • AMS 4675 
  • ASTM B165
  • ASTM B163
  • ASTM F96
  • UNS N04400

2. What Is Monel 400 Price?

The price of Monel 400, like any other metal or alloy, varies based on various factors such as market conditions, supply and demand, quantity ordered, the supplier’s pricing, the material (sheet, wire, tube, fitting, rod, plate, screws, etc.,). However,  on average, Monel 400 costs between $25-$50 per kg.

3. Monel 400 Vs. Hastelloy C276

Regarding Monel 400 vs. Hastelloy C276, they are both alloys with high rust, wear, and heat resistance. Monel 400 is a nickel-copper alloy that is resistant to seawater-induced decay. It has applications in valve and pump manufacturing, fasteners, and other materials used in power generation, marine engineering, and other industrial processes.

On the other hand, Hastelloy C276 is a nickel-molybdenum-chromium exhibiting high strength, excellent fabricability, and good thermal stability. Hastelloy C276 is often used in food processing equipment, pipes for passing chemical fluids, and other applications requiring immunity against metal rusting. 

4. Inconel 600 vs. Monel 400 Hardness

Inconel 600 has excellent high-temperature strength and oxidation resistance, while Monel 400 exhibits good mechanical properties and superior corrosion resistance. When comparing Inconel 600 vs. Monel 400 hardness, it is essential to note that the first has higher hardness than the second. 

Monel 400 offers moderate hardness, allowing easy machining and forming, while Inconel 600 possesses higher hardness due to its solid solution strengthening and precipitation-hardening capabilities. However, heat treatment can modify their hardness depending on your desired properties.

5. Is Monel 400 Magnetic?

Yes, Monel 400 is non-magnetic. It retains its non-magnetic properties even at extremely low temperatures. This characteristic makes Monel 400 suitable for applications requiring non-magnetic and magnetic reduction behavior, such as in certain electronic or sensitive equipment.

6. Is the Alloy 400 the Same as Monel 400?

Alloy 400 and Monel 400 are the same. “Alloy 400” and “Monel 400” are often used interchangeably to refer to the same nickel-copper alloy. They both describe the same composition and exhibit similar properties, making them identical. 

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