This means that the thickness and thickness tolerance are larger for astm a 123 than a 153. The following table presents a comprehensive listing of the standards applicable to hotdip galvanized materials. Astm a123 a123m 09 standard specification for zinc hot. The astm spec that covers structural steel shapes is astm a123123m. Astm a123a123m17 red standard specification for zinc hot. The equivalent aashto specification to astm a153 is aashto m232. The zinciron alloy of the coating has hardness values. Astm a123a123m17 standard specification for zinc hotdip galvanized coatings on iron and steel products.
Or is there other standards that can be looked at in relation to being hot dipped galvanized. This specification covers the standard requirements for hotdip galvanized zinc coatings on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips. Hotdip galvanizing to astm a123 fact sheet american. A123 a123m17 standard specification for zinc hot dip galvanized coatings on iron and steel products hotdip galvanizing zinc coating steel plates steel strips steel bars steel forgings zinccoated steel products. The astm specifications a143a143m, astm a384a384m, and astm a385 provide guidelines for preparing products for hotdip galvanizing. Hotdip galvanizing complies with numerous astm standards. Afterfabrication, batch hotdip galvanizers, including those that are members of the aga, galvanize to astm a123123m, specification for zinc hotdip galvanized coatings on iron and steel products. Conclusion the hotdip galvanization of structural steel should be considered in projects featuring. Hot dip galvanized coating procedure certified iso 9001. While the steel is in the kettle, the iron in the steel metallurgically reacts with the molten zinc to form a tightlybonded alloy coating that provides superior corrosion protection to steel. Coatings on iron and steel products should be the cornerstone of your project speci fication. Question what are the most commonly used specifications.
I am doing hotdip galvanizing as per standard of astm a123 affil. This article details the use of defelsko coating thickness gages within the zinc galvanizing industry. Astm is composed of more than 30,000 technical experts from 5 countries around the world, with each expert serving on one of 141 technical committees. There are many differences between galvanizing per astm a153 a123 and plating per astm b633, including. Astm a123a123m09 standard specification for zinc hotdip. Hotdip galvanized coated iron and steel product and hardware surfaces for powder coating. Astm123 vs astm 153 astm testing materials code issues.
An astm designation number identifies a unique version of an astm standard. Standard specification for zinc hotdip galvanized coatings on iron and steel products covers guidelines for zinc coating galvanizing by the hotdip process on iron and steel products made from rolled, pressed, and forged shapes, castings, plates, bars, and ships. Hot dip galvanizing of fasteners is typically specified to meet the requirements of astm a153, class c aashto m232, class c. If something has been hot dipped galvanized does that mean that it has been done in accordance with the astm 153 or astm a123 affil. Surface preparation surface preparation is the most important step in the application of any coating. Astm a123 a123m09, standard specification for zinc hot dip galvanized coatings on iron and steel products, astm international, west conshohocken, pa, 2009. Standard specification for zinccoated galvanized steel bars for concrete reinforcement is exclusively applicable to hotdip galvanizing. Astm a123 requires the finish to be smooth, uniform, and continuous to ensure longterm corrosion resistance from the.
Astm a123a123m standard specification for zinc hot. Steel materials to be hotdip galvanized or electrodeposit plated go through a three step process. Astm a123 is a related hotdip galvanizing specification covering iron and steel products made from rolled and pressed shapes, castings, plates, bars, and strips. This specification covers the standard requirements for hotdip galvanized zinc coatings on iron and steel products made from rolled pressed and forged shapes. Once the material has been hotdip galvanized, it can be fully inspected at the galvanizing plant prior to shipment. Corrosion protection hot dip galvanizedastm a153 vs b633. Astm a123 a123m zinc coatings on iron and steel products this specification covers the requirements for zinc coating galvanizing by the hotdip process on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips. Hot dip galvanizing for concrete reinforcing steel shall comply with astm a 767.
Products are galvanized according to long established, wellaccepted, and approved standards of astm a123a123m, asnzs 4680, and bs. This specification covers the requirements for zinc coating galvanizing by the hotdip process on iron and. Hotdip galvanizing to astm a123 fact sheet hotdip galvanizing hdg is the process of dipping fabricated steel into a kettle or vat containing molten zinc. For annual book of astm standards volume information, refer to the standards document summary page on the astm website. Note 1this specification covers those products previously addressed in specifications a 12378 and a 38678. These technical committees maintain approximately 12,000 standards that help guide a wide range of industries. O hslpol bo box meet accqou abbcata glrq 01 etauqglq doi. The hotdip galvanizing process the galvanizing process consists of three basic steps. A basic understanding of how steel is handled in the galvanizing plant and what the steel undergoes in the application of. This specification was developed as a fastener specific standard in 2005, and is slowly replacing astm a153 as each individual fastener standard is updated. Specifying and detailing for hotdip galvanizing aisc. A123 a123m17 standard specification for zinc hotdip galvanized coatings on iron and steel products hotdip.
Specifying and detailing for h igh quality galvanized coatings are obtained when steel assemblies are designed to promote unrestricted. Astm a123 a123m 17 standard specification for zinc hotdip. Astm standard practices a143, a384 and a 385 should also be observed so that a high quality coating can be achieved. It does note include themass weight of iron reacted with the zinc coating and may overestimatecoating mass weight by up to 10 %. Galvanizing in this step, the material is completely immersed in a bath consisting of a mini. A number in parentheses indicates the year of last reapproval. These are each defined below and discussed in more detail later in this course. What is the astm spec for galvanizing for structural steel shapes. Galvanizing is a term often wrongly used to describe zinc coatings in general. Astm a123 a123m zinc coatings on iron and steel products.
Astm a123 for structural steel american galvanizers. Astm a123a123m09 standard specification for zinc hotdip galvanized coatings on iron and steel products. Astm a123a123m standard specification for zinc hotdip. Zinc hotdip galvanized coatings on iron and steel products1. Astm a123 is a related hotdip galvanizing specification covering iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.
Active standard astm a123 a123m developed by subcommittee. In most instances, incorrect or inadequate surface preparation is generally the cause of a coating. Astm a123 123 m, and asnzs 4680 speed of application can be applied in minutes faster construction no site surface preparation is necessary. Our spinner and structural material adheres to all astm 153 f2329 and astm 123 latest revisions. Repair of damaged and uncoated areas of hotdip galvanized coatings. This specification also covers steel forgings and iron castings incorporated into pieces fabricated before galvanizing or which are too large to be centrifuged or otherwise handled to remove excess galvanizing bath metal. Hotdip galvanizing hdg is the process of dipping fabricated steel into a kettle or vat containing molten zinc. Sspinner material adheres to all astm a153 f2329 latest revisions structural material adheres to all astm 123 revisions all material hot dipped galvanized proudly in u. The chemical comppsition of the zinc material astm b 6 is identical. A123a123m 12 standard specification for zinc hotdip galvanized coatings on iron and.
The requirements listed in astm a123a123m include coating thickness, finish, appearance, and adherence. Astm a384a384m standard practice for safeguarding against warpage and distortion during hotdip galvanizing of steel assemblies published by astm on may 1, 2007 steel assemblies and subassemblies fabricated by welding, such as composite structural members, sash, weldments, etc. Galvanizing thickness measurement resources defelsko. Astm a123 for structural steel american galvanizers association. Thickness or weight of zinc coating for various classes.
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