Monel 405 alloy steel

Monel 405 steel material is the free machining version of Monel 405. It is a nickel-copper alloy with a controlled amount of sulfur added to provide sulfide inclusions that act as chip breakers during machining. Like Monel 405, alloy Monel 405 is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Monel 405 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good corrosion-resistance, good weldability and high strength. A low corrosion rate in rapidly flowing brackish or seawater combined with excellent resistance to stress corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions led to its wide use in marine applications and other non-oxidizing chloride solutions. This nickel steel alloy is particularly resistant to hydrochloric and hydrofluoric acidswhenthey are de-aerated. As would be expected from its high copper content, alloy Monel 405 is rapidly attacked by nitric acid and ammonia systems.
Monel 405 Nickel alloy usually used in the following industries :UNS N04405
Monel 405 is chiefly used for automatic-screw-machine stock and it not generally recommended for other applications. Screw machine stock for fasteners and similar high production run items.
Meter and valve parts
Screw machine products

Monel 405 alloy steel

Chemical Composition, % of Monel 405 Nickel base alloy

Ni Cu Fe S Mn C Si
63.0 min 28.0-34.0 2.5 max 0.025-0.060 2.0 max 0.3 max 0.5 max

Mechanical Properties of Monel 405 Nickel base alloy

Condition Tensile (ksi) .2% Yield (ksi) Elongation % Hardness Brinell (3000 kg) Hardness Rockwell B
Annealed 70-85 25-40 50-35 110-140 60-76
Hot-Finished 75-90 35-60 45-30 130-170 72-86
Cold-Drawn, As-Drawn 85-115 50-105 35-15 160-245 85-23C

Monel 405 Nickel base alloy characteristics :
Characteristics are essentially the same as those of Monel 400 such as:
Good machinability and is recommended for use with automatic screw machines
Resistant to seawater and steam at high temperatures
Excellent resistance to rapidly flowing brackish water or seawater
Excellent resistance to stress corrosion cracking in most freshwaters
Particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated
Offers some resistance to hydrochloric and sulfuric acids a modest temperatures and concentrations, but is seldom the material of choice for these acids
Excellent resistance to neutral and alkaline salt
Resistance to chloride induced stress corrosion cracking
High resistance to alkalis


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