Precipitation-hardening (PH) stainless steels are essential materials in modern engineering. They bridge the gap between the superior corrosion resistance of austenitic grades (like 304 or 316) and the high hardness of martensitic grades (like 410 or 440). What is ASTM A564?
This is the most popular precipitation-hardening grade. It contains approximately 17% chromium and 4% nickel, supplemented with copper.
standard material specification for hot-rolled and cold-finished age-hardening stainless steel bars and shapes astm a564 pdf
To pass certification, a mill heat must meet strict mechanical thresholds defined in the ASTM A564 standard tables. The exact requirements vary drastically depending on the chosen aging temperature.
Aged at 1025°F (552°C) for 4 hours, air cool. A balanced condition offering high strength with improved ductility. This is the most popular precipitation-hardening grade
If your supplier offers a DIN 1.4542 certificate, it is chemically identical to ASTM A564 Grade 630, but you must ensure the heat treatment condition matches.
Fasteners and mechanical components subjected to saltwater or harsh environments. The exact requirements vary drastically depending on the
, it is important to ensure you are referencing the latest revision (e.g., ASTM A564/A564M-19). Official copies are typically managed by: ASTM International:
Can be heat-treated to various "H" conditions (e.g., H900, H1025) to achieve specific hardness and strength levels. For example, condition typically yields a Rockwell C hardness of 35–43. Zhengzhou Huitong Pipe Fittings Co.,Ltd. Resources and PDF Links
sacrifices ultimate strength to maximize material ductility, toughness, and resistance to stress-corrosion cracking. 4. Mechanical Property Requirements
ASTM A564 (Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes) covers a specific class of stainless steel alloys. These metals undergo a specialized heat treatment known as precipitation hardening (or age hardening) to achieve superior mechanical properties.