Alloy 400: The Pinnacle of Nickel-Copper Alloys

Alloy 400, or UNS N04400, is a strong nickel-copper alloy that is highly resistant to corrosion in different environments.

This metal is proof of progress in science. It has qualities that make it popular for different industries.

Unveiling the Strength of Alloy 400

At the heart of Alloy 400 lies its unique chemical composition. Comprising primarily of 66% nickel and 30% copper, this alloy is further enhanced with traces of iron, manganese, and carbon. Alloy 400 has a strong resistance to stress corrosion cracking, chloride ion pitting, and other types of corrosion. These problems are commonly found in many places.

Versatility in Fabrication

Alloy 400 is not just about resistance and strength; it's about adaptability. Its excellent mechanical properties, combined with its malleability, make it a popular choice in the manufacturing sector. Alloy 400 can be easily shaped, joined, and welded into sheets, plates, bars, or tubes to suit various project needs.

It conducts heat and electricity well, and doesn't expand much when heated. This makes it good for hot, high-pressure, and corrosive environments.

Applications Spanning Industries

Alloy 400 has proven its value in multiple industries. These industries include chemicals, marine, oil and gas, and power generation. Alloy 400 has demonstrated strong performance in each of these sectors. Its high resistance to corrosion, especially in challenging environments, makes it an invaluable asset in these industries.

A Deeper Dive into Alloy 400's Composition

The chemical makeup of Alloy 400 is meticulously balanced to offer the best of both strength and resistance. Typically, its composition includes:

  • Nickel (Ni): 66.0 - 70.0%
  • Copper (Cu): 29.0 - 33.0%
  • Iron (Fe): ≤ 1.5%
  • Manganese (Mn): ≤ 2.0%
  • Carbon (C): ≤ 0.15%
  • Silicon (Si): ≤ 0.5%
  • Sulfur (S): ≤ 0.015%

It's important to know that the composition of the product may vary depending on the manufacturer and grade.

Physical and
Mechanical Prowess

Alloy 400's physical properties, such as its density and melting point, combined with its mechanical strengths like tensile strength and yield strength, make it a robust and reliable choice for various applications. Its low annealed yield strength and work hardening rate further enhance its ease of fabrication.


Alloy 400 is a special mix of nickel and copper that is carefully made to perform exceptionally well. This alloy shows how innovative metallurgy can combine the best qualities of different metals to make an exceptional material.

The nickel component in Alloy 400 imparts remarkable strength and toughness, ensuring that the material can withstand significant stresses without deformation. On the other hand, the copper element enhances its corrosion resistance, making it resilient against a wide range of corrosive agents, from saline seawater to acidic solutions.

But the synergy of Alloy 400 goes beyond its elemental composition. The special structure of this alloy, made from nickel and copper, gives it a rare versatility not found in other metals. Alloy 400 stays strong and performs well even when faced with heat, chemicals, or physical strain.

Industries across the globe recognize the value that Alloy 400 brings to the table. Its longevity is a key factor that makes it a preferred choice for applications where durability is paramount. Alloy 400 is reliable in marine and industrial settings, providing corrosion resistance and mechanical strength.

Moreover, its adaptability ensures that it can be tailored to fit a wide range of applications. Alloy 400 is impressive because it maintains its properties in aerospace and oil and gas industries. It can retain its properties whether it is shaped into complex parts or pipes.

In conclusion, Alloy 400 is not just an alloy; it's a promise of reliability, durability, and excellence. The special mix of nickel and copper, along with its great qualities, makes it very valuable for industries that prioritize quality.