AMS 5643 is an aerospace material specification for a corrosion resistant precipitation
hardenable steel alloy. Common names for the alloy are 17-4, type 630, or UNS S17400.
AMS 5643 includes material in the form of bars, wire,forgings, forging stock, tubing, and rings.
This alloy is typically used where a combination of strength and corrosion resistance is required
in applications with service temperatures up to 600 deg F.
With the exception of forging stock, material to this standard is supplied in the solution heat
treated condition that can be readily heat treated to final properties during the manufacture of
To assure the results of the final precipitation hardening treatment; samples of the product are
precipitation hardened to the H900 condition and tensile tested for conformance to specification
For more info check out our 17-4 grade page here.