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Today’s topic is Monel alloy 405 when produced by Special Metals Corporation or simply alloy 405 in a generic form by other producing mills.  UNS designation for the chemical composition is  N04405.

A solid solution of nickel and copper, it cannot be strengthened by heat treatment.

Cold work can increase strength as in other commercial alloys. Typical of all the Monel alloys, it has an excellent combination of strength, toughness, and ease of fabrication.  A small sulfur addition increases the machinability of 405 as compared to alloy 400 for screw machine applications.  In other applications it would offer no advantage over alloy 400.

Excellent salt water corrosion performance leads to many marine applications such as components of valves, pumps, shafts, fixtures, fasteners, and fittings where the faster machining is important.

Monel is found in NACE applications in petroleum production and refining. Other  chemical processing equipment applications take advantage of its corrosion performance and thermal properties. It is recognized in ASME standards for applications within the Boiler and Pressure Vessel Code.

Chemical Composition   UNS N04405

Nickel (plus Cobalt)  …………………………………………….  63 % Minimum

Copper  ………………………………………………………………  28. 0 – 34.0 %

Carbon  ………………………………………………………………  0.3 % Maximum

Manganese  ………………………………………………………..  2.0 % Maximum

Iron  ……………………………………………………………………  2.5% Maximum

Sulfur  …………………………………………………………………  0.025 – 0.060%

Silicon  ………………………………………………………………..  0.5% Maximum

 

Density …….  .318 pounds per cubic inch

Typical room temperature  mechanical properties in the annealed condition:

 

Tensile strength ………..  70,000  –  85,000   psi

Yield strength  ………….. 25,000  –  40,000  psi

Elongation  ……………….   50  – 35 %

Curie temperature  …………..  70 – 120  deg F  ( dependent on actual chemistry)  making alloy 405  not reliably non-magnetic in near room temperature environments

 

Specifications

Bar and Forgings:

AMS 4674,  AMS  7234

QQ-N-281

ASTM B 164

ASME SB 164

Each specification has requirements that can add to or restrict the chemical composition or properties beyond what we have shown you today.  Additional processing and testing requirements exist in the individual specifications.

So we always say ……..         CHECK ….THE……. SPECS. Thanks again for tuning in, this is Michael with Michael Talks Metals. If you have made it this far and have yet to subscribe, please do, click here. If you have missed any of the previous videos, click here.  See you next Thursday and thanks for watching.