However, the AGA does provide a compilation of specifications pertinent to galvanizing. Purchase a copy from the AGA, or contact your local galvanizer. The material categories covered in the specification include structural steel and plate, strips and bars, pipes and tubing, and wires. Fabrications can have more than one material category, such as a frame assembly.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope excess of about 0. Steels 1. Recent studies have shown that even in 1. Referenced Documents have a mottled or dull gray appearance.
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. Steel Selection normal coatings. There is also evidence that these coatings are 3. In addition, a layer of the until after an item has been galvanized.
Not all combinations of molten zinc adheres to the surface of the compound layers as silicon, phosphorus, carbon, and manganese can be galvanized the steel is withdrawn from the galvanizing bath. Upon successfully. When the steel chemistry is known beforehand, solidification, this adherent zinc forms the eta layer. Certain elements found in steels are known to have finish. The experience of the steel supplier, designer, manufac- an influence on the coating structure. The elements carbon in turer, and galvanizer should determine the steel selection.
The 1 This practice is under the jurisdiction of ASTM Committee A05 on Metallic relative corrosion resistance of the normal and abnormal Coated Iron and Steel Products and is the direct responsibility of Subcommittee coatings is, for all practical purposes, equal.
Current edition approved April 10, Published May Originally approved in Last previous edition approved in as A — Assemblies of Different Materials or Different Surfaces 5. Overlapping or Contacting Surfaces or Both 5. Furthermore, cleaning solution compounds not generally uniform in appearance.
These differences in- that remain on these surfaces volatilize during the galvanizing clude: process and may interfere with zinc wetting in adjacent areas. Such uncoated surfaces cause a rust staining after exposure to 4. Traditionally however, steel grating has been 4.
ASTM specifications. Vent holes or unwelded area around the blasting of the entire assembly will normally improve galva- adjoining surfaces should be provided through one or both nizing quality. Similarly these holes shall allow all solutions and molten 6. Failure to follow this practice will result in areas that will not galvanize properly, or 6.
Grease or oil This is generate gas which will prevent zinc from sealing the contact accomplished by cropping the corner to provide an opening edges. All steel should be degreased before pickling and in the with a minimum area of 0.
Weld Flux Removal and Welding Rods pressures when heated to the galvanizing temperature. Pipe 7. Thus, they will not be removed by standard shown in Fig. Where internal venting is not 7. The vent openings shall be a 7. Cold Forming Before Galvanizing with tubular product assemblies. The venting shall open 8. This is the most desirable situation. A A Shearing, Cutting and Punching Before Galvanizing 9.
Warpage and Distortion NOTE 1—Strengthening gussets in channel sections should be cropped for zinc drainage. While FIG. For small cross sections, larger percent in Specification A See attached drawings for In box sections Fig.
In addition, a center hole shall be provided so that tapping of the nut that is required for proper fit. Gusset plates shall not be spaced closer than 36 in.
In the case of columns with end plates Fig. Should this occur on screws, scale removal prior to shall be vented. The vent opening shall be a half circle with its threading is desirable in order to avoid overpickling of the diameter at the base plate D, Fig.
This is much superior threaded area. On trusses Fig. Critical Dimensions members intersect, vent holes are recommended at both sides Moving Parts and must be subsequently hot-dip galvanized, the designer should be aware that the hot-dip galvanizing process uses It may scribed in Section 3. This should be accounted for in the critical be necessary to post heat these parts in order to have them dimension design.
Re-machining or otherwise reprocessing of function freely. This heating may cause discoloration of the critical dimensions after hot-dip galvanizing may be required. Marking for Identification Keywords Using the following formulas, the chart shows typical sizes of holes and clipped corners.
Internal Gussets—Should be spaced a minimum of 36 in. The following chart is for square box sections only. For rectangular sections, calculate required area and check with galvanizer for positioning of openings. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm. Related Papers. By William Marquez. By Neo YT. Galv Manual. By Rajesh Pais. By Sofian Hadi. By Andres Benitez.
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Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More A This practice covers the precautions that should be taken to obtain high-quality galvanized coatings. Assemblies should consist of elements of similar chemistry and surface condition. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance. These differences include excessively rusted surfaces, pitted surfaces, machined surfaces, cast iron especially with sand inclusion, cast steel, malleable iron, hot-rolled steel, and cold-rolled steel.
What are the differences between ASTM A123/A123M and ASTM A385?