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.

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This specification covers rolled steel structural shapes for use in building framing or bridges, or for general structural purposes. 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.

Vent holes or unwelded area around the adjoining surfaces should be provided through one or both sides into the lapped area in accordance with the following tables. Cold Forming Before Galvanizing 9.

What are the differences between… | American Galvanizer’s Association

Furthermore, cleaning solution compounds that remain on these surfaces volatilize during the galvanizing process and may interfere with zinc wetting in adjacent areas. 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.

If there are galvanized parts in concrete near steel parts with no corrosion protection, there can be active corrosion cells whenever moisture is present. Galvanized Steel in Concrete Thank you for interesting in our services. Overlapping or Contacting Surfaces 4. The purpose of the calculation is to provide justification for the purchase of a higher initial cost system with a low life-cycle cost over an initially less expensive coating which has high future costs.

Scope zinc, resulting in the formation of several iron-zinc compound layers, for example, gamma not always visible microscopicallydelta, and zeta in Fig.

However, the AGA does provide a compilation of specifications pertinent to galvanizing. This specification covers the chemical, mechanical, and dimensional requirements for eight grades Grades O, A, B, C, D, DH, C3, and DH3 of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.


Should this occur on screws, scale removal prior to threading is desirable in order to avoid overpickling of the threaded area. Whenever different analyses of steel or different surfaces of steel are united in an assembly the galvanized finish is not generally uniform in appearance.

In addition, a center hole shall be provided so that the cumulative area of the vent holes meets the recommended minimum. It may also be known by its trade name, e.

Similarly these holes shall allow all solutions and molten zinc to drain freely from the assemblies.

ASTM Specifications

When no passivation layer is on the surface of the galvanized coating and no chromates are in the concrete, there is a slight chance of a reaction between the zinc metal and the concrete water solution.

ASTM A Practice for Repair of Damaged and Uncoated Areas of HOt-Dip Galvanized 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. These rare situations can be avoided by allowing the parts to weather for a few weeks before placement, adding chromates to the concrete, or applying a passivation layer onto the galvanized coating.

To accommodate the thickness of the galvanized coating on the bolt, the clearance hole may need to be reamed to remove excess galvanized coating so that the galvanized bolt will fit in the clearance hole. NOTE 1—Strengthening gussets in channel sections should be cropped for zinc drainage. Welding flux residues shall be removed by standard galvanizing cleaning techniques and are best removed at the gun.

Pipe handrail shall preferably be vented full open internally, as shown in Fig. This is accomplished by cropping the corner to provide an opening with a minimum area of 0. This specification covers black and hot-dipped galvanized hot-formed welded and seamless carbon steel square, round, rectangular, or special shape structural tubing for welded, riveted, or bolted construction or bridges and buildings, and 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.


Purchase a copy from the AGA, or contact your local galvanizer. There are coating thickness minimums, but no maximums, and the threads are not subject to the coating thickness requirement. 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. Please help us to share our service with your friends.

Link to Active This link will always route to the current Active version of the standard. Traditionally z385, 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.

The vent opening shall be a half circle with its diameter a3885 the base plate D, Fig. The requirements in the specification facilitate the production of a high-quality zinc coating and are similar to those found in A and A Such uncoated surfaces cause a rust staining after exposure to the environment. The highest quality system contains all galvanized steel parts.

Warpage and Distortion 8. Work Item s – proposed revisions of this standard. Re-machining or otherwise reprocessing of critical dimensions after hot-dip galvanizing may be required.

However, if the galvanizer has to perform additional work in order to prepare x385 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. We need your help! Permission rights to photocopy the standard may also be secured from the ASTM website www. They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate.