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: | |
|---|---|
| Carbon | 0.05 % Max |
| Manganese | 0.10 % Max |
| Silicon | 0.10 % Max |
| Phosphorus | 0.010 % Max |
| Sulfur | 0.008 % Max |
| Chromium | 12.25 – 13.25 % |
| Nickel | 7.50 – 8.50 % |
| Molybdenum | 2.00 – 2.50 % |
| Aluminum | 0.90 – 1.35 % |
| Nitrogen | 0.010 % 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 5659 | Bar and Forgings |
| ASTM A 564 | Bar and Forgings |
| ASME SA 564 | Bar and Forgings |
| AMS 5864 | Plate |
| ASTM A 693 | Plate |
| ASME SA 693 | Plate |
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!
