Nickel 400, commonly known as Monel® 400, is a nickel-copper wire alloy containing approximately 63% nickel and 28–34% copper, providing excellent corrosion resistance, high strength, and outstanding toughness across a wide range of temperatures. The nickel-copper chemistry of Nickel 400 offers exceptional resistance to seawater, salt solutions, acids, alkalis, and other harsh environments, making it particularly well suited for marine hardware, chemical processing equipment, oil and gas components, aerospace applications, wire forms, springs, fasteners, and electrical equipment. Nickel 400 is widely used where long-term corrosion resistance, durability, and reliable performance are required in demanding industrial and marine environments.
Nickel 400 alloy wire is identified under multiple naming conventions, including grade, alloy, and UNS designations; depending on the specification, industry, or standard being used.
Nickel 400
Nickel Alloy 400
Alloy 400
Monel® 400
Monel 400
UNS N04400
N400
NiCu 400
Nickel-Copper Alloy 400
67Ni-30Cu Alloy
Cu-Ni 400
Marine Grade Nickel Alloy
Corrosion Resistant Nickel-Copper Alloy
ASTM B164 Nickel 400
W.Nr. 2.4360
DIN 2.4360
EN 2.4360
NiCu30Fe
Nickel 400 Wire
Nickel Alloy Wire 400
Nickel 400 alloys are known by several names depending on the standard, specification, or drawing being used. Understanding these alternate names matters because the same alloy can appear under different designation systems across quotes, certifications, standards, and legacy prints. For buyers and engineers working with wire, this is especially important, since Nickel 400 may be referenced through material standards tied to specific product forms and applications rather than by one simple trade name alone.
Alloy 400 is a general commercial shorthand and conversational naming style used throughout the nickel alloy industry when the nickel-copper alloy family is already understood. Best for casual product discussions, internal communication, sales conversations, and simplified technical language where the audience already knows the material is a nickel alloy. It is concise, recognizable, and easy to read, but it is less precise than formal designation systems because the term “alloy” by itself does not identify the governing specification, standards organization, or numbering system associated with the material. Alloy 400 is widely recognized throughout industry as the nickel-copper alloy commonly known as Nickel 400 or Monel® 400, valued for its excellent corrosion resistance, strength, and durability in marine, chemical processing, and industrial environments.
Monel® 400, or just Monel 400, is the most widely recognized trade name for Nickel 400, a nickel-copper alloy known for its exceptional corrosion resistance, strength, and durability in harsh environments. Best for product descriptions, marketing materials, engineering discussions, procurement specifications, and industry references where brand recognition is valuable. The designation Monel® 400 is widely used throughout the marine, chemical processing, oil and gas, aerospace, and power generation industries and is often used interchangeably with Nickel 400, Alloy 400, and UNS N04400. This trade name immediately identifies the alloy as a high-performance nickel-copper material that offers outstanding resistance to seawater, salt solutions, caustic environments, and many corrosive chemicals, making it one of the most recognized nickel alloys in industrial service.
UNS N04400 is the official Unified Numbering System (UNS) designation for Nickel 400. Best for formal material identification, cross-referencing between industry standards, quality assurance documentation, mill certifications, engineering specifications, and multi-standard procurement requirements. This designation serves as the clearest and most unambiguous identifier when matching Nickel 400 across different specification systems and international standards. It is especially useful when a drawing, certification, purchase order, or compliance document requires a formal material designation rather than a commercial or trade-style name. The designation UNS N04400 is widely recognized throughout the marine, chemical processing, aerospace, oil and gas, and industrial sectors as the standardized identifier for the nickel-copper alloy commonly known as Nickel 400 or Monel® 400.
NiCu 400 is a chemistry-based designation commonly used to describe Nickel 400 based on its nickel-copper alloy composition. Best for technical discussions, alloy comparisons, metallurgy references, and international material specifications where alloys are identified by their principal alloying elements. This designation highlights the alloy’s nickel-copper chemistry, which provides excellent resistance to seawater, salt solutions, caustic environments, and many corrosive chemicals. While widely understood within technical and engineering communities, NiCu 400 is a compositional descriptor rather than a formal material designation such as UNS N04400 or W.Nr. 2.4360, and it is commonly used interchangeably with Nickel 400, Alloy 400, and Monel® 400.
Nickel-Copper Alloy 400 is a common technical designation for Nickel 400 that highlights the alloy’s primary composition of nickel and copper. Best for engineering discussions, metallurgy references, alloy comparisons, and technical documentation where material chemistry is important. This designation emphasizes the alloy’s unique nickel-copper combination, which provides excellent resistance to seawater, salt solutions, acids, alkalis, and other corrosive environments. Widely recognized throughout the marine, chemical processing, oil and gas, and industrial sectors, Nickel-Copper Alloy 400 is commonly used interchangeably with Nickel 400, Alloy 400, Monel® 400, and UNS N04400 when describing this high-performance corrosion-resistant alloy.
67Ni-30Cu Alloy is a chemistry-based designation commonly used to describe Nickel 400 based on its approximate composition of 67% nickel and 30% copper. Best for educational content, alloy comparisons, metallurgy discussions, and technical references focused on nickel-copper alloy chemistry. This designation highlights the alloy’s unique combination of nickel and copper, which provides outstanding resistance to seawater, salt solutions, caustic environments, and many corrosive chemicals. While useful for describing the material’s composition, 67Ni-30Cu Alloy is a compositional descriptor rather than a formal material designation such as UNS N04400 or W.Nr. 2.4360, and it is commonly associated with Nickel 400, Alloy 400, and Monel® 400.
Cu-Ni 400 is a chemistry-based designation sometimes used to describe Nickel 400 based on its copper-nickel alloy composition. Best for metallurgy discussions, alloy comparisons, technical references, and international material specifications where alloys are identified by their principal alloying elements. This designation highlights the alloy’s balanced nickel-copper chemistry, which provides excellent resistance to seawater, salt solutions, caustic environments, and many corrosive chemicals. While Cu-Ni 400 is useful for describing the alloy’s composition, it is less precise than formal material designations such as UNS N04400 or W.Nr. 2.4360, and it is commonly associated with Nickel 400, Alloy 400, NiCu 400, and Monel® 400.
Marine Grade Nickel Alloy is a common industry description for Nickel 400 because of its exceptional resistance to seawater, saltwater, brackish water, and marine atmospheric conditions. Best for marine hardware, offshore equipment, seawater piping systems, pumps, valves, fasteners, wire forms, and other applications exposed to harsh marine environments. This designation highlights the alloy’s nickel-copper chemistry, which provides outstanding resistance to corrosion, erosion, and stress-corrosion cracking in many marine service conditions. As a result, Nickel 400 is widely regarded as one of the most trusted nickel alloys for long-term performance in demanding marine and offshore applications.
Corrosion Resistant Nickel-Copper Alloy is a common technical description for Nickel 400 because of its exceptional ability to withstand corrosion in seawater, salt solutions, caustic environments, and many non-oxidizing acids. Best for marine equipment, chemical processing systems, oil and gas components, offshore hardware, wire forms, and industrial applications exposed to aggressive service conditions. This designation highlights the alloy’s nickel-copper chemistry, which provides outstanding resistance to corrosion, erosion, and environmental degradation while maintaining excellent strength and toughness. As a result, Nickel 400 is widely recognized as one of the most versatile and dependable corrosion-resistant nickel alloys used throughout the marine, chemical processing, and industrial sectors.
ASTM B164 Nickel 400 is the designation used when Nickel 400 is supplied in accordance with ASTM B164, the industry specification covering nickel-copper alloy rod, bar, and wire products. Best for engineering specifications, procurement documents, quality requirements, and applications involving Nickel 400 wire, rod, bar, springs, fasteners, and machined components. This designation helps identify the alloy within ASTM-controlled requirements and is frequently referenced in technical documentation, certifications, and purchasing specifications where the mechanical and chemical properties of Nickel 400 (UNS N04400) must conform to recognized ASTM standards. ASTM B164 is one of the most common specifications associated with Nickel 400, particularly for wire and bar products used in marine, chemical processing, aerospace, and industrial applications.
W.Nr. 2.4360 is the Werkstoffnummer (material number) designation for Nickel 400 and is widely used in European engineering specifications, certifications, and technical documentation. Best for international procurement, material cross-referencing, and quality documentation. The designation W.Nr. 2.4360 provides a standardized material identifier that helps engineers and buyers match Nickel 400 across European and global standards systems while identifying it as a corrosion-resistant nickel-copper alloy known for its excellent performance in marine, chemical processing, oil and gas, and industrial applications. It is commonly cross-referenced with UNS N04400, Monel® 400, Alloy 400, and EN 2.4360.
DIN 2.4360 is the German material designation for Nickel 400 and is commonly used in European engineering specifications, material certifications, and procurement documents. Best for international sourcing, technical documentation, and material cross-referencing. The designation DIN 2.4360 provides a standardized identifier that helps engineers and buyers match Nickel 400 across global standards systems while identifying it as a corrosion-resistant nickel-copper alloy known for its excellent resistance to seawater, salt solutions, and harsh chemical environments. It is commonly cross-referenced with UNS N04400, Monel® 400, Alloy 400, and W.Nr. 2.4360 in international engineering and manufacturing applications.
EN 2.4360 is the European material number designation for Nickel 400 within the EN (European Norm) standards system. Best for European engineering specifications, international procurement, material certifications, technical documentation, and cross-referencing between global nickel alloy standards. The use of EN 2.4360 immediately identifies the material according to a standardized European classification, making it easier to match Nickel 400 across international supply chains and regulatory requirements. This designation is widely recognized throughout Europe and is commonly found on mill certificates, engineering drawings, quality documentation, and material specifications where compliance with European standards is required. It is commonly cross-referenced with UNS N04400, Monel® 400, Alloy 400, and W.Nr. 2.4360 as an equivalent designation for this corrosion-resistant nickel-copper alloy.
NiCu30Fe is the European chemical designation commonly used to describe Nickel 400 based on its nickel-copper-iron composition. Best for European engineering specifications, metallurgy discussions, alloy comparisons, and technical documentation where materials are identified by their principal alloying elements. This designation highlights the alloy’s approximate composition of 30% copper and iron additions within a nickel-rich matrix, which contribute to its excellent corrosion resistance, strength, and toughness in marine and chemical processing environments. Widely recognized throughout Europe, NiCu30Fe is commonly associated with Nickel 400, Monel® 400, Alloy 400, UNS N04400, and EN 2.4360, making it a useful reference for international material cross-referencing and technical communication.
Nickel 400 has a density of approximately 8.80 g/cm³ (0.318 lb/in³) and is composed of 63.00% minimum nickel, 28.00–34.00% copper, 2.50% maximum iron, 2.00% maximum manganese, 0.50% maximum silicon, 0.30% maximum carbon, and 0.024% maximum sulfur, with trace amounts of other elements permitted within specification limits. It is a solid-solution nickel-copper alloy known for its exceptional corrosion resistance, high strength, and outstanding toughness across a wide range of temperatures. The unique nickel-copper chemistry of Type 400 provides excellent resistance to seawater, brackish water, salt solutions, caustic environments, and many reducing acids, making Nickel 400 an excellent choice for marine hardware, offshore equipment, chemical processing systems, oil and gas components, wire forms, springs, fasteners, aerospace hardware, and other demanding applications requiring long-term corrosion resistance and reliable mechanical performance.
Nickel wire alloys are used in various industries, including:
Sunset Wire can manufacture custom diameters of N400 for your project. Common sizes of UNS N04400 include:
Sunset Wire stocks a large inventory of stainless steel wire to ensure you get it fast. Get your wire in 1 lb cans, 1 lb spools or 5 lb spools. Other spool sizes are available upon request.
Why Choose Sunset Wire?
Sunset Wire provides domestically drawn wire in various diameters, lengths and packages. Get your stainless steel wire delivered anywhere in the US thanks to our large inventory and dedicated supply chain management capabilities.
Nickel wire alloys are metal wires primarily composed of nickel, often combined with other elements like chromium, copper, iron or molybdenum.