Comparable to 304 stainless steel in many environments.
The PDF details the "aging" process. Unlike standard steels that are hardened by quenching (rapid cooling), A564 steels are hardened by holding them at moderate temperatures (900°F to 1150°F) for an hour. This causes microscopic particles to "precipitate" out of the metal matrix, locking the structure in place and dramatically increasing strength. The PDF provides the precise temperatures and times required to achieve conditions like H900 (highest strength) or H1150 (more ductile). astm a564 pdf
is the standard specification for hot-rolled and cold-finished age-hardening stainless steel bars and shapes . In plain English: It covers stainless steel that gets stronger after heat treatment. Comparable to 304 stainless steel in many environments