Nickel Alloy UNS N04400 (Monel® 400) Product Introduction

Overview

Nickel Alloy UNS N04400, commonly known as Monel® 400, is a high-performance nickel-copper alloy renowned for its exceptional corrosion resistance, mechanical strength, and versatility in demanding environments. Developed for use in aggressive conditions, it is a premier choice for industries ranging from marine engineering to chemical processing.

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Composition

Monel® 400 is primarily composed of:

• Nickel (Ni): 63–67% (provides corrosion resistance and stability)

• Copper (Cu): 28–34% (enhances ductility and thermal conductivity)

• Iron (Fe): ≤ 2.5%

• Manganese (Mn): ≤ 2.0%

• Trace elements: Carbon (C), Silicon (Si), Sulfur (S) (each ≤ 0.5%)

This balanced composition ensures resilience in both reducing and neutral environments.

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Key Properties

• Corrosion Resistance: Excels in seawater, hydrofluoric acid, alkalis, and sulfuric/hydrochloric acids under reducing conditions. Resists stress corrosion cracking and pitting.

• Mechanical Strength: Maintains high tensile and yield strength across a wide temperature range (-150°C to 480°C).

• Thermal Stability: Retains properties at elevated temperatures, ideal for heat exchangers.

• Ductility: Easily fabricated into complex shapes despite its strength.

  
  

Applications

Monel® 400 is widely used in:

• Marine Engineering: Propeller shafts, pump components, seawater valves.

• Chemical Processing: Reactors, piping, and vessels handling acids and solvents.

• Oil & Gas: Wellhead components, fasteners, and heat exchanger tubing.

• Aerospace: Fuel and hydraulic systems.

• Other Uses: Fasteners, springs, and architectural applications in corrosive atmospheres.

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Fabrication Notes

• Machining: Use sharp tools with slow speeds to avoid work-hardening; coolant recommended.

• Welding: Employ compatible filler metals (e.g., Monel® 60) using TIG or MIG methods.

• Forming: Anneal at 870–980°C if cold-worked extensively.

• Cleanliness: Prevent contamination by avoiding sulfur-bearing lubricants.

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Availability

Available in multiple forms:

• Sheet/Plate (ASTM B127)

• Bar/Wire (ASTM B164)

• Tubing (ASTM B165)

• Custom forgings and fittings upon request.

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Safety Considerations

Standard metalworking precautions apply: ensure ventilation during machining to avoid inhalation of particulates.

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Why Choose Monel® 400?

UNS N04400 offers unmatched durability in corrosive and high-stress environments, outperforming stainless steels and other alloys in specific conditions. Its blend of strength, adaptability, and longevity makes it a cost-effective solution for critical applications.

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This introduction highlights Monel® 400’s key attributes, ensuring engineers and purchasers understand its value in challenging operational settings.

If you need more information about your current project, please contact me at Julie@gaoshengpipe.com