Zinc Coating Thickness Requirements: ASTM A vs. F Dimension. ASTM A ASTM F Avg. Coating. Thickness of. Specimens. Tested. ASTM F covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special. ASTM A does not cover threaded bolts and fasteners. ASTM A and F are the ASTM specifications that cover the requirements for.
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Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
The amount of additional documentation beyond ASTM A requirements will vary depending on a number of optional requirements the customer can specify under F Sal- Are you asking which galvanizing standard you should be using?
It is intended to be applicable to fasteners that are centrifuged or otherwise handled to remove excess zinc. Work Item s – proposed revisions of this standard.
ASTM A This specification covers the requirements for hot-dip galvanizing on iron and steel products made from rolled pressed and forged shapes, castings, asym, bars, and strips.
A and F again are more or less the same, F references back to the processes in A, but goes into more detail with respect to the specifics of threaded fasteners.
The number of specimens to be tested per order shall be as speci?
The differences in the types of lots entail different sampling plans, which specify the number of test articles atm performing various test methods during inspection of the finished product. Adhesion testing is not typically performed when galvanizing to the requirements of A unless there is evidence of an adhesion concern, but F requires adhesion testing stout knife test to be performed for the number of articles listed in Table 1, and for every batch lot.
Parts may be dull due to the presence of silicon in the steel. The average of those selected measurements is the average coating thickness.
A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts axtm washers. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Historical Version s – view previous versions of standard.
Hot-Dip Galvanizing Specifications – Portland Bolt
In no case shall the average reading of a single specimen be below the average thickness shown in the Average Thickness on Individual Specimen column. The test methods for appearance and smoothness under F shall be conducted for every batch lot by visual inspection in accordance with methods provided in A The dull appearance shall not be cause for rejection. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
It does not cover threaded fasteners that are centrifuged or otherwise handled to remove excess zinc. Any insights would be deeply appreciated.
The purchaser shall ensure that the effect of the heat generated by the galvanizing process is compatible with the fastener regarding the? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
NOTE 1—The scope of this speci? Leave a Reply Cancel reply Your email address will not be published. Electroplating is an entirely different process and is a much thinner coating. F defines the two different lots and their associated sampling plans as follows: If the galvanizing process is carried out at a higher temperature than the stress relief or the tempering temperature of the fasteners, than the purchaser shall make provision for mechanical v2329.
F — 05 Standard Speci? Each bolt specification may list additional methods to adtm hydrogen embrittlement as well as place additional requirements on embrittlement testing which should be researched separately. Quenching According to F Paragraph 5.
Because A does not require water quenching nor chemical post-treatments, communication between the customer and the galvanizer is required to determine whether the galvanizer has a quench tank and the capability to perform chemical post-treatments, or if air-cooling will be acceptable.
Hot-Dip Galvanizing Specifications
Compared to the sampling plan in A, F requires fewer samples per batch lot size, but the galvanizer is required to also ff2329 adhesion testing and visual inspection for appearance on these test articles as defined by Table 1. Dane- Thanks for response. C Coating thickness frequency of measurements: The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for: Suitable acceptance criteria shall be ast between the purchaser and the galvanizer before placing the order.
See excerpt of Table 1 below. Combining values from the two systems may result in non-conformance with the standard.
ASTM F2329 vs. ASTM A153
Afif — The difference between hot dip galvanizing xstm articles and fasteners is the spinning. Current edition approved Feb. Baking shall be conducted after pickling and prior to hot-dip galvanizing. Note—Based upon mathematical calculations, 1.
In addition, small parts shall be air cooled as needed in order to prevent the formation of zinc oxide. Packaging and Package Marking F defines the two different lots and their associated sampling plans as follows:.
If the asrm specifies, the galvanizer will be required to provide the average galvanizing temperature the fasteners will be exposed to. This specification is intended to be applied to hardware items that are centrifuged or otherwise handled to remove excess zinc. Spinning removes excess zinc from the fastener so that the nut will mate with the bolt.