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. Designation: A – 03 Standard Practice for Providing High-Quality Zinc ASTM Standards: These elements manifest their structural effect as an A. ASTM Apdf – Download as PDF File .pdf), Text File .txt) or read online.
|Published (Last):||11 May 2014|
|PDF File Size:||19.32 Mb|
|ePub File Size:||3.62 Mb|
|Price:||Free* [*Free Regsitration Required]|
This hole shall be located as close as astj to the weld bead joining astmm two steel pieces and the edge of the hole shall be not more than 0. Cosmetically this accelerated growth is seen as a gray matte finished coating as opposed to the usual bright and smooth appearance of galvanized coatings. The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A Also, the combination of two different steel types or thicknesses in one item may result in a nonuniform galvanizing finish.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. On trusses see Fig. The adherence requirement is the same as A, for strong bond throughout the life of the hot-dip galvanized steel. This is much superior to putting a hole with the circumference of the hole NOTE 1—Crop corners of gussets on fabricated columns. Using the following formulas, the chart shows typical sizes of holes and clipped corners.
All markings shall remain legible after galvanizing. Cold Forming Before Galvanizing 9.
A number in parentheses indicates the year of last reapproval. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The steel beams are then cooled back to ambient temperature so the thermal cycling can create thermal stresses in the area of the cope.
The highest quality system contains all galvanized steel parts. Assemblies should consist of elements of asrm chemistry and surface condition. The following is a summary of the various pertinent hot-dip galvanizing specifications. This will lessen the corrosion protection offered by the galvanized coating.
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.
Finally, there are requirements for passivating the material chromating to prevent reaction between concrete and the zinc coating, and on bend diameters. Welding flux residues shall be removed by standard galvanizing cleaning techniques and are best removed at the gun.
The reaction between zinc metal and concrete water solution can release small quantities of hydrogen gas bubbles.
This practice covers the precautions that should be taken to obtain high-quality galvanized coatings. Marking for Identification Within the text of this specification and where appropriate, SI units are shown in brackets.
ASTM Specifications | American Galvanizer’s Association
Ashm following can cause warpage and distortion: Scope zinc, resulting in the formation of several iron-zinc compound layers, for example, gamma not always visible microscopicallydelta, and zeta in Fig.
Asm addition, a center hole shall be provided so that the cumulative area of the vent holes meets the recommended minimum. This test method deals with the standard procedures for establishing the relative bond strength of steel reinforcing bars in concrete using beam-end specimens.
Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance.
Re-machining or otherwise reprocessing of critical dimensions after hot-dip galvanizing may be required. Historical Version s – view previous versions of standard. This test method shall determine the asstm of surface preparation or condition such as bar coatings on the bond strength of deformed steel reinforcing bars to concrete.
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. Permission rights to photocopy the standard may also be secured from the ASTM website www. For small cross sections, larger percent vent openings are recommended. We need your help! Standard Specification for Zinc Coating Hot-Dip on Iron and Hardware applies to hardware products such as castings, fasteners, rolled, pressed, and forged products, and miscellaneous threaded objects that will be centrifuged, spun, or otherwise handled to remove the excess zinc.
KnowledgeBase What is EN ? Vent holes or unwelded area x385 the adjoining surfaces should be provided through one or both sides into the lapped area in accordance with the following tables.
All steel should be degreased before pickling and in the case of folded assemblies, before folding and assembling see Fig. The requirements of this specification are very similar to those in A, except for the addition of threaded products and embrittlement requirements. The vent opening shall be a half circle with its diameter at the base plate D, Fig. Link to Active This link will always route to the current Active version of the standard.
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.
Weld Flux Removal and Welding Rods 7.
Traditionally however, steel grating has been manufactured without seal welding and when properly executed, this manufacturing means has permitted the galvanized coating to satisfy the quality requirements of the applicable ASTM specifications.
See attached drawings for specific recommendations.