What is ASTM?
ASTM is the common designation for the ASTM International (formerly known as American Society for Testing and Materials). ASTM International is an American based standard organisation that oversees the development and curation of technical standards. One of these technical standards is A564.
What is A564?
The ASTM A564 (A564M is the equivalent metric version of A564) is a technical specification a that covers bars and profiles of age-hardened stainless steels. Variations of the steels covered are hot-finished or cold-finished rounds, squares, hexagons, bar shapes, angles, tees, and channels are included. These various shapes may be produced by hot rolling, extruding, or forging. The material shall be subjected to tension, impact, and hardness tests. The steel grades for the specification are defined by the chemical composition. ASTM A564 equivalent materials in other standards (JIS, EN, DIN, GOST etc.) may be found by investigating the individual material grades.
Material Grades of A564
There are three common grade naming conventions for A564:
1.Three Number Code:
AZZ
3XX - Austenitic Chromium Nickel Alloys
4XX - Ferritic / Martensitic Chromium Alloys
Additional Letters are related to added elements.
Ti – Titanium
H – Higher Carbon
L – Lower carbon
N – Nitrogen
2. Unified Numbering System (UNS)
AXXXXXX
A – Primary material category letter S for steel or N for Nickel.
X – Unique Number code for category.
3. ASTM numbering system for proprietary steels.
XM - Z
Z - Code for steel grade.
Designations provided to represent the heat treatments provided to the materials:
Condition HXXXX
H - Heat Treatment
XXXXX - Temperature in Fahrenheit
Condition A
A - Annealed
See material pages of the steel grades of ASTM A564 for greater details on the material properties and equivalent materials: