What is 15-5 Stainless Steel?

15-5 or UNS S15500 …. Whichever you choose to call it …… is a precipitation hardenable
corrosion resistant “stainless” steel alloy.
Heat treatment consists of two steps….
First is a “solution treatment” or “solution anneal” at 1900 deg F that is later followed by a
“precipitation” or “aging” heat treatment in the range of 900 to 1150 deg F.
The result is a combination of strength and corrosion resistance used in many applications.
Highest strength is achieved at 900 deg F and designated as H900.
Solution treatment is commonly performed at the producing mill and the precipitation treatment
during the manufacture of the component part.
Common aerospace material specifications are:
AMS 5659 for bars, forgings, tubing, wire, and rings
AMS 5862 for sheet, strip, and plate