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A Comprehensive Guide to Nickel-based Alloy: Monel R-405 (UNS N04405)

What is Monel R-405?

Monel R-405 (also known as UNS N04405) is a nickel copper alloy, which is part of Monel series superalloys. Monel 405 is usually present in the form of sheet, strips, rods, bars and wires, which improves machinability due to its high sulfur content. In addition, the superalloy has excellent corrosion resistance and high strength. These properties make it very suitable for difficult marine and chemical environments. It is also resistant to sulfuric acid and performs well at sub zero temperatures.

20231024064129 23888 - A Comprehensive Guide to Nickel-based Alloy: Monel R-405 (UNS N04405)

Monel R-405 (UNS N04405) Seamless Pipe

Due to the increase of sulfur content, it has better processability than Monel 400. Its corrosion resistance and physical properties are similar to those of Monel 400, but the mechanical properties are slightly different from those of Monel 400.

Chemical Composition of Monel R-405 (UNS N04405)















Physical Properties of Monel R-405 (UNS N04405)

(g/cm3 )

Melting point

Poisson ratio

Curie temperature





Mechanical Properties of Monel R-405 (UNS N04405)

Material Form and Condition Tensile Strength Ksi Yield Strength (0.2% Offset) Ksi Elongation (%) Hardness Rockwell B
Alloy 405 Rod and Bar Annealed 70-85 25-40 50-35 60-76
Alloy 405 Rod and Bar Cold- Drawn, As- Drawn 85-115 50-105 35-15 85-23C
Alloy 405 Rod and Bar Hot Finished 75-90 35-60 45-30 72-86

Corrosion Resistant of Monel R-405 (UNS N04405)

Like Monel alloy 400, Monel R-405 is hardly affected by chloride stress corrosion cracking in typical environments. Generally speaking, it has good corrosion resistance in reducing environment, but poor in oxidation condition. It does not work in oxidizing acids such as nitric acid and nitrite. Nevertheless, it is resistant to most alkali, salt, water, food, organic matter and atmospheric conditions at normal and high temperatures.
The corrosion resistance of Monel 400 and R-405 is similar to that of nickel, but the maximum working pressure and temperature are higher, and the cost is lower due to their superior processing ability.

Characteristics of Monel R-405 (UNS N04405)

Corrosion resistance in a wide range of marine and chemical environments. From pure water to non oxidizing inorganic acids, salts and bases.

  • Monel R405 is more resistant to nickel than copper under reducing conditions and more resistant to copper under oxidizing conditions, but it does show a better anti reduction medium than oxidation.
  • Good mechanical properties from sub zero temperature to about 480 C.
  • It has good tolerance to sulfuric acid and hydrofluoric acid. However, aeration increases the corrosion rate. It can be used to treat hydrochloric acid, but the presence of oxidized salt will greatly accelerate the corrosion.
  • It is resistant to neutral, alkaline and acid salts, but the resistance to oxidizing acid salts (such as ferric chloride) is poor.
  • Excellent resistance to chloride stress corrosion cracking.

The machinability of Monel R-405

Machinability is good. High-speed tool steels should be used with oil base lubricants. Turning is done at speeds of 140-160 surface feet per minute with a feed rate of approximately 0.004 in./revolution. Drilling is done at 50-65 surface feet per min. with feed of 0.003 in./revolution.

Forming of Monel R-405

  • The alloy is especially adaptable to screw machine operations.

Welding of Monel R-405

  • Standard welding methods may be used.
  • Hot working of Monel R-405

    • Hot working is not recommended.

    Cold working of Monel R-405

    • The alloy is readily cold worked, especially in screw machine operations.

    Hardening of Monel R-405

    •  Hardens due to cold working only.

    Annealing of Monel R-405

    • Anneal at 1700 F and air cool. A stress relief only anneal may be done at 1000 F for 1-1/2 hour followed by air cool.

    Heat Treatment of Monel R-405

    • The alloy may be annealed but does not otherwise respond to heat treating.

    Application areas of nickel-based alloy Monel R-405 (UNS N04405)

    MonelR405 has been widely used in many industries:

    • The oil and gas industry: MonelR405 is used as a component for various highly corrosive environments, such as valves and pump parts.
    • Marine engineering: The marine environment is highly corrosive, so MonelR405 is widely used in the shipbuilding industry to make propellers for ships.
    • Medical devices: Due to its excellent corrosion resistance and biocompatibility, MonelR405 is used in the medical field to manufacture medical devices such as human implants.
    • Aerospace: MonelR405 is also widely used in the aerospace industry, such as making parts of engines.

    Variety specifications and supply status of Nickel-based super alloy: Monel R-405 (UNS N04405)

    Variety classification:

    Yaang Pipe Industry can produce various specifications of Monel R-405 seamless pipe, Monel R-405 steel plate, Monel R-405 round bar, Monel R-405 forgingsMonel R-405 flangeMonel R-405 pipe fittings, Monel R-405 welded pipe, Monel R-405 steel strip, Monel R-405 wire and supporting welding materials. 

    Delivery status:

    • Seamless pipe: solid solution + acid white, length can be set;
    • Plate: solid solution, pickling, trimming;
    • Welded pipe: solid solution acid white + RT% flaw detection;
    • Forging: annealing + car polish; Bars are forged and rolled, surface polished or car polished;
    • Strips are delivered after cold rolling, solid solution soft state, and deoxidized;
    • Wire rods are finely ground in solid solution pickled disk or straight strips, solid solution straight strips Delivery in light state.



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