Technical specifications and scope of the ASTM/ASME A/SA 153M standard
The ASTM/ASME A/SA 153M standard regulates the requirements for zinc coating applied by the hot-dip method to iron and steel components, including fasteners and hardware. The process technology is based on immersing products in a molten zinc bath, which initiates a metallurgical reaction between the metal surface and the zinc. As a result, durable iron-zinc (Zn/Fe) intermetallic layers are formed, providing high corrosion resistance and coating adhesion.
The specification is designed for products that undergo centrifuging or mechanical processing after removal from the molten bath to remove excess free zinc. The coating thickness parameters established by EV Group China strictly comply with this standard, taking into account the specifics of post-processing.
For fastener products subject to the Fastener Quality Act, strict statistical sampling protocols are provided. Sampling procedures for inspection control are regulated by the F2329/F2329M standard.
This standard allows for the use of two unit systems: inch-pound (ASTM A153) or SI (ASTM A153M). It is important to note that the values in these systems are not direct equivalents. EV Group China engineers recommend using the systems independently of each other. When placing an order in SI units, it is necessary to pre-coordinate the use of metric testing and control methods with the production department.
Compliance with ASTM/ASME A/SA 153M requirements is the key to the durability of metal structures in aggressive environments. The user of the standard is responsible for observing safety and occupational health protocols during hot-dip galvanizing operations.