Full Transcript:

Hey what’s up guys, this is Michael with Michlin Metals. Guess what? Today we’re talking about super alloys! Today tho it’s all about COBALT!!!!! Get your checkbooks out folks because this stuff is super! Super expensive.

In our last video in this series about Nickel and Cobalt based alloys we talked about the Hastelloys…. Nickel based alloys made by Haynes International.

The name Hastelloy comes from Haynes Stellite Alloy….  Ha Ste lloy’. Stellite ” name is  also associated with products made by this company.

The early company was named Haynes Stellite and later became  the Stellite division of Union Carbide, and then of Cabot Corporation. The stellite name then went to Kennametal in hard facing and tooling products and the current Haynes International remains as the wrought metal products mill that we know today.

So what other type of alloys developed  by Haynes International can we talk about? You guessed it,they are alloys with Cobalt as the majority element.

As we did in the previous video, we will give you only the major elements required to define the alloy.  Specifications will include requirements and restrictions for other minor elements.

We have included some other names as well, so remember that a trade name product can only be produced by specific mills.  Generic products may be produced by others.

Cobalt based alloys are assigned the letter R prefix …. Other metal groups also share this prefix.  And remember the UNS designation only defines the chemical composition.

Here goes…. some of the more common grades of Cobalt based wrought alloys.

Haynes 188 UNS R30188 has a nominal composition consisting of  39% Cobalt, 22% Nickel, 22% Chromium, 3% Iron, and 14 % Tungsten.  Its strength comes from the elements in solid solution and cannot be increased by heat treatment. It is used in high temperature applications

Haynes Ultimet UNS R31233 is an alloy of 54% Cobalt, 9% Nickel, 26% Chromium, 3% Iron,5% Molybdenum, and 2% Tungsten.  It is used in corrosion environments with a need for some additional wear or galling resistance. Also a solution strengthened alloy.

Haynes 25  or  L-605  UNS R30605 is  51% Cobalt, 10% Nickel, 20% Chromium,15% Tungsten, and 1.5% Manganese.  Its strength and oxidation resistance have been long used in gas turbine components. A solid solution alloy.

Haynes 6B (aka Stellite 6B)  UNS R30016 has a nominal composition of 58% Cobalt ,2.5% Nickel, 30% Chromium, 4% Tungsten, 1.4% Mn, 3% Iron, and 1.5% Molybdenum.. A solid solution alloy for high temperature applications.

MP-35N   UNS R30035 is an alloy of 35% Cobalt, 35% Nickel,20% Chromium, and 10% Molybdenum. A solid solution alloy that can be strengthened by cold work with or without heat treatment for aerospace applications.

These alloys are very complex so application is best left to the very experienced aerospace and corrosion engineers and designers. Their specifications will fully define the material, so as we always say……..  Check the Specs

Thanks for watching everyone, this wraps up our discussion on Nickel and Cobalt based alloys. Thank you for tuning in! Next couple weeks for the holidays will be a little different. I will throw out a video next Thursday and that will be the last of 2020. Good riddance 2020, YOU SUCK! Next week will be a little different in that we’ll be talking about industry jargon and what words like VIM and VAR mean. Sounds great right? If you are still here, I have a secret for you. YOU LIKE METAL!!!! If you ARE still here then consider subscribing. Click here. If you missed any of the previous videos, click here. Thanks for watching, this is Michael with Michlin and I’m out!