What’s up guys?!?!?! This is Michael with Michael Talks Metal back for more metal monologues! Say THAT 10 times fast!
Our topic for today is A286! What is A286? Is A286 stainless steel? A286 is another precipitation hardening type of stainless steel high temperature alloy. The UNS designation for the chemical composition is UNS S66286 and the AISI alloy number is 660.
Capable of high strength after heat treatment and good corrosion and oxidation resistance , A-286 finds applications in aircraft or turbine components requiring strength and oxidation resistance at temperatures up to 1300° F. Oxidation resistance remains at useful levels at temperatures as high as 1500° F
For aircraft applications premium aircraft quality AMS 2300 and Consumable Electrode Melting (CEM) are requirements.
As in all of the precipitation hardening stainless grades, it receives a solution anneal that is followed by a hardening treatment to develop final properties.
Solution treatment is typically performed by one of the following methods depending on specification:
1800° F for 1 hour at heat, then cool rapidly to room temperature or 1650° F for 2 hours at heat, then cool rapidly to room temperature.
Aging: 1300 / 1400° F for 12 to 16 hours at heat, then air cool
a second aging at 1200° F for 8 to 12 hours is sometimes specified to provide an increase in notch rupture strength.
|A286 UNS S66286 Chemical Composition:|
|Carbon||0.08 % Max|
|Manganese||2.00 % Max|
|Silicon||1.00 % Max|
|Phosphorus||0.025 % Max|
|Sulfur||0.025 % Max|
|Chromium||13.50 – 16.00 %|
|Nickel||24.00 – 27.00 %|
|Molybdenum||1.00 – 1.50 %|
|Titanium||1.90 – 2.30 %|
|Aluminum||.35 % Max|
|Vanadium||0.10 – 0.50 %|
|Boron||0.003 – 0.010 %|
Density .286 lbs per cubic inch in the solution annealed condition
Minimum Mechanical Properties for Bars:
After 1800 deg F Solution Treatment and Aging
130,000 psi Tensile Strength
85,000 psi Yield Strength
15 % Elongation
20 % Reduction of Area
After 1650 deg F Solution Treatment and Aging
140,000 psi Tensile Strength
95,000 psi Yield Strength
12 % Elongation
15 % Reduction of Area
And now to specs! Holy Moly, look at all those. So, here’s the deal. A286 is an extremely dynamic grade. As you can see here, there are a ton of specs. In addition to that, they all vary significantly, so much that we decided to make this a 2 part video. Next week we’ll discuss these specs at length but for now, take a gander, and we’ll move on. Make sure to tune in next week for part 2.
ASTM A 483
ASTM A 638
But as we have told our viewers many times before, specifications and part requirements can add to or alter the information we have presented to you today. So for time 56 CHECK THE SPECS, then check them again.
Appreciate you all tuning in, if you made it this far and haven’t subscribed please consider doing so now. Click here. If you missed our previous video, click here. Michlin Metals is a supplier/distributor of A286 and for more info check out our website… michlinmetals.com.
Thanks for watching, see you next Thursday, 10am. I’m out!