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What’s up guys? This is Michael with Michael Talks Metal back for more metal musings. Today we’re talkin about Maraging 300 but before we do, if you can help out the channel and subscribe, we’d be grateful for the support, or worst case, if you like the video, make sure to SMASH that like button! (please) 🙂 So let’s jump in.

Today our Video topic is Maraging 300;  a high strength Iron base alloy of Nickel, Cobalt, and Molybdenum. Additions of Titanium and Aluminum  provide the ability to age harden with a simple low temperature heat treatment.  UNS designation is K93120.

A stable low carbon martensitic structure provides good fabricability in the solution treated or annealed condition and can be readily welded.

In aerospace applications it is used for parts requiring high strength with toughness in the final heat treated condition and is Consumable Electrode Melted for cleanliness to AMS 2300 quality requirements

Both the annealed and solution treated conditions create a stable martensitic structure and would normally be performed by the producing mill.

Typical age hardening of fabricated parts is performed at 900 deg F for 4 to 6 hours at temperature to develop the high strength final condition.

Maraging 300 UNS K93120 Chemical Composition: 
Carbon0.03 % Max
Manganese0.10 % Max
Phosphorus0.010 % Max
Sulfur0.010 % Max
Silicon0.10 % Max
Nickel18.00 – 19.00 %
Cobalt8.50 – 9.50 %
Molybdenum4.60 – 5.20 %
Titanium0.50 – 0.80 %
Aluminum0.05 – 0.15 %

Density:  .289 lbs per cubic inch

Mechanical Properties after aging at 900 F – Longitudinal – Bars up to 4 inches 

Tensile Strength ………   280,000 psi Minimum

Yield Strength  …………   270,000 psi Minimum

Elongation  ……………..       5 %  Minimum

Reduction of Area   …..     30 % Minimum

Maraging 300 Specifications: 
AMS  6514Bars, Forgings, Tubing, and Rings;   CEVM, Annealed
Mil – S- 46850

As we have told our viewers many times before, specifications, prints,  and part requirements can add to or alter the information we have presented to you today so for time 60!!!!!  CHECK THE SPECS – check the specs – twice. Michlin is a supplier and distributor of Maraging 300 and for more info, visit us at or website… michlinmetals.com. Made it this far and haven’t subscribed please click here, missed our last video, click here for the Nickel 200/201 video.