ASTM A gives information on recommended steel chemistry for steel to be galvanized, as well as required venting/drainage hole. ASTM A/A M. Standard Practice for Providing High-Quality Zinc Coatings (Hot-Dip) provides details on steel selection and other design practices such as. ASTM Apdf – Download as PDF File .pdf), Text File .txt) or read online.

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Referenced Documents have a mottled or dull gray appearance. This specification covers the ast, for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process. Enter the email address you signed up with and we’ll email you a reset link.

Certain elements found in steels are known to have finish. The requirements for finish, appearance, and adherence are identical to those in the other main standards. Historical Version s – view previous versions of standard. They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate. However, the AGA does provide a compilation of specifications pertinent to galvanizing.

ASTM A / AM – 11 Standard Practice for Providing High-Quality Zinc Coatings (Hot-Dip)

However, if the galvanizer has to perform additional work in order to prepare the product for hot-dip galvanizing, such as drilling holes to facilitate drainage or venting, the galvanizer will communicate and resolve the issue with the customer. This standard is subject awtm revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.

ASTM does not give any warranty express or implied or make any representation that the contents of this asym are accurate, complete or up to date. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance.


All oil or grease should be removed from both the sheet steel and wire or rod before rolling. Where internal venting is not 7. Assemblies should consist of elements of similar chemistry and surface condition. Similarly these holes shall allow all solutions and molten 6. Critical Dimensions members intersect, vent holes are recommended at both sides This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes.

When an assembly of steel parts or an individual steel part has been designed and fabricated with critical dimensions and must be subsequently hot-dip galvanized, the designer should be aware that the hot-dip galvanizing process chemical cleaning to prepare the surfaces for coating and this may alter the critical dimensions.

Overlapping or Contacting Surfaces or Both 5.

See attached drawings for The specification outlines three acceptable forms of touch-up: Traditionally however, steel grating has been 4. This specification covers cold-formed welded and seamless carbon steel round, square, rectangular, ast, special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and for general structural purposes. This specification covers carbon structural steel shapes, plates, and bars of structural quality for use in riveted, bolted, or welded construction of bridges and buildings, and for general structural purposes.

The venting shall qstm 8.

ASTM Specifications | American Galvanizer’s Association

In the case of columns with end atm Fig. Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters. All markings shall remain legible after galvanizing.

Welding flux residues shall be removed by standard galvanizing cleaning techniques and are best removed at the gun. This should be accounted for in the critical be necessary to post heat these parts in order to have them dimension design. This specification covers black and hot-dipped galvanized hot-formed welded and seamless carbon steel square, round, rectangular, astmm special shape structural tubing for welded, riveted, or bolted construction or bridges and buildings, and for general structural purposes.


Sometimes, a large surface may have A Practice for Safeguarding Against Warpage and Dis- adjacent areas of matte finish and bright finish leading to a tortion During Hot-Dip Galvanizing of Steel Assemblies2 mottled appearance.

This is generate gas which will prevent zinc from sealing the contact accomplished by cropping the corner to provide an opening edges. A requires a continuous, smooth, and uniform finish with no uncoated areas including on the threads or issues that interfere with its intended use. This heating may cause discoloration of the critical dimensions after hot-dip galvanizing may be required.

A35 A Practice for Repair of Damaged and Uncoated Areas of HOt-Dip Astj Coatings covers appropriate methods used to repair damaged hot-dip galvanized coatings on hardware, structural shapes, and other hot-dip galvanized products, including uncoated areas remaining after initial hot-dip galvanizing. Standard Specification for Zinc Hot-Dip 3a85 Coatings on Iron and Steel Products covers individual steel pieces as well as assemblies of various classes of material.

The following is a summary of the various pertinent hot-dip galvanizing specifications. The vent openings shall be a 7. Specification for Structural Steel. It is the responsibility of the designer and fabricator to ensure the product has been properly designed and built before the hot-dip galvanizing process supporting specifications. A number in parentheses indicates the year of last reapproval.

What are the differences between ASTM A123/A123M and ASTM A385?

Failure to follow this practice will result in areas that will not galvanize properly, or 6. Current edition approved April 10, Gusset plates shall not be spaced closer than 36 in. For rectangular sections, calculate required area and check with galvanizer for positioning of openings.

Standard Specification for Zinc. Finally, the adherence requirement is for the entire coating to have a strong adherence throughout the service life of the galvanized steel.