Hot dip galvanizing is a common metal anti-corrosion process widely used in steel products to extend their service life and provide better protection. ASTM (American Society for Testing and Materials) has developed multiple standards to standardize the procedures and requirements for hot-dip galvanizing, with ASTM A153 and ASTM A123 being the two main standards. The following are the comparisons and differences between these two standards:
ASTM A153:
ASTM A153 is a standard for hot-dip galvanized steel hardware. This standard is usually applicable to small iron parts, such as bolts, nuts, pins, screws,elbows,tees,reducers, etc.
1. Scope of application: Hot dip galvanizing for small metal parts.
2. Zinc layer thickness: Generally, the minimum thickness of the zinc layer is required. Usually lightweight galvanized, providing good corrosion resistance.
3. Application field: Commonly used in indoor environments with relatively low requirements for corrosion resistance, such as furniture, fences, household hardware, etc.
4. Temperature requirements: There are regulations for the hot dip temperature of different materials.
ASTM A123:
Unlike ASTM A153, ASTM A123 standard is applicable to larger sized structural components, steel pipes, steel beams, etc.
1. Scope of application: Suitable for larger structural components, such as steel components, bridges, pipelines, etc.
2. Zinc layer thickness: There is a higher minimum requirement for the coated zinc layer, usually providing a thicker zinc coating to provide stronger protection.
3. Field of use: Commonly used for outdoor and exposed structures in harsh environments, such as bridges, pipelines, outdoor equipment, etc.
4. Durability: Due to the involvement of more important structural components, the galvanized layer is required to withstand longer periods of corrosion and environmental erosion.
Comparison and Summary:
1. Different application ranges: A153 is suitable for small components, while A123 is suitable for larger structural components.
2. The thickness and durability of the zinc layer are different: A123′s zinc coating is thicker and more durable, providing a higher degree of protection.
3. Different fields of use: A153 is commonly used in indoor and relatively low corrosion environments, while A123 is suitable for outdoor and high corrosion environments.
4. Temperature requirements and process slightly different: The two standards have their own hot dip temperature and process requirements for different sizes and types of items.
Overall, the differences between ASTM A153 and ASTM A123 mainly lie in their scope of application, zinc layer thickness, usage environment, and durability requirements. According to specific usage scenarios and requirements, manufacturers and engineers need to select standards that meet corresponding needs to ensure product quality and durability.
Post time: Nov-02-2023
