What’s up guys?!?!?!?!?! This is Michael with Michael Talks Metal, back again for some more metal. Before we jump in, how about 91% of you subscribe….see this nifty little graphic here? Just numbers and math folks. You are all watching but only 9% are subscribed. Help me, help the channel, hit that little button!!! Ok, enough of the soapbox! Let’s do this!!!! Our topic for today is a precipitation hardening type of stainless steel 13-8.

The UNS designation for chemical composition is UNS S13800

Capable of high strength and toughness after heat treatment and with the corrosion and oxidation resistance typical of stainless steels, 13-8 finds applications in aircraft structural applications as well as chemical and petrochemical processing equipment.

For aerospace applications, the alloy is premium quality Consumable Electrode Melted CEM or Consumable Electrode Vacuum Melted CEVM.  Cleanliness requirements of AMS 2300 are applicable.

As in all precipitation hardening stainless grades the first step is a solution treatment followed by an aging treatment.

Typical solution treatment is at 1700  followed by rapid air cooling to room temperature.

Aging temperatures are specified by the condition description:

The H950 condition  is aged at 950  deg F,  H1100 is aged at  1100 deg F, etc.

Aging  requires  4 hours at temperature.  Cooling rate after aging is an air cool.


13-8 UNS S13800 Chemical Composition:
Carbon0.05 % Max
Manganese0.10 % Max
Silicon0.10 % Max
Phosphorus0.010 % Max
Sulfur0.008 % Max
Chromium12.25 – 13.25 %
Nickel7.50 – 8.50 %
Molybdenum2.00 – 2.50 %
Aluminum0.90 – 1.35 %
Nitrogen0.010 % Max


Density: .279 lbs per cubic inch

Minimum  Mechanical Properties:   H 950  condition –  Longitudinal

220,000 psi Tensile Strength

205,000 psi  Yield  Strength

10 % Elongation

45 % Reduction of Area


13-8 Specifications:
AMS 5659Bar and Forgings
ASTM A 564Bar and Forgings
ASME SA 564Bar and Forgings
AMS 5864Plate
ASTM A 693Plate
ASME SA 693Plate

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 we’re done with 40s, for the 50th, the 50th time….CHECK THE SPECS. This is Michael with Michael Talks Metal, thanks for watching, if you are still here and haven’t subscribed, please click here. If you have missed any previous videos, and want to catch up, click here!

Thanks for watching, this is Michael, see you next Thursday, 10am. I’m out!