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What’s up everyone?!?! This is Michael with Michael Talks Metals back for another round on Monel. Today’s topic is Monel alloy K-500 when produced by Special Metals Corporation or simply alloy 500 in a generic form by other producing mills. The  UNS designation for the chemical composition is  N05500. K-500 offers the corrosion resistance of alloy 400 but with greater strength and hardness.

A solid solution of nickel and copper with additions of aluminum and titanium, K – 500 can be strengthened by heat treatment. Precipitation ( aka aging) provides the increased strength. Cold work can further enhance strength and hardness.

Typical of all the Monel alloys it has excellent corrosion resistance and it is used where higher strength and hardness is also required.

Excellent salt water corrosion performance leads to many marine applications such as components of valves, pumps, shafts, fixtures, fasteners, and fittings.

K-500 has a curie temperature well below 0 degrees F in all conditions making it suitable for many non- magnetic applications where alloys 400 and 405 would not be acceptable.

Monel is found in NACE applications in petroleum production and refining that require high strength or non – magnetic properties. Other  chemical processing equipment applications take advantage of its high strength, corrosion performance, and thermal properties. It is recognized in ASME standards for certain applications within the Boiler and Pressure Vessel Code.

Chemical Composition   UNS N05500

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

Copper  ………………………………………………………………  27. 0 – 33.0 %

Carbon  ………………………………………………………………  0.25 % Maximum

Manganese  ………………………………………………………..  1.5 % Maximum

Iron  ……………………………………………………………………  2.0 % Maximum

Sulfur  …………………………………………………………………  0.01 % Maximum

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

Aluminum …………………………………………………………….  2.30 – 3.15 %

Titanium  ………………………………………………………………  0.35 – 0.85 %

Density …….  .305 pounds per cubic inch

Typical room temperature  mechanical properties in the hot finished, annealed and aged condition:

Tensile strength ………..  130,000  –  165,000   psi

Yield strength  ………….. 85,000  –  120,000  psi

Elongation  ……………….   35  –  20 %

Curie temperature varies from minus 130 degrees F to minus 210 degrees F depending and actual chemistry, heat treatment and any cold work

Specifications

Bar and Forgings:

AMS 4676

QQ-N-286

ASTM B 865

Plate, Sheet, and Strip

QQ – N – 286

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 for watching this is Michael with Michael Talks Metal. If you have missed any previous videos, click here. If you have made it this far and haven’t subscribed please consider doing so now. Please make sure to tune in next week for another session where Michael Talks Metal!