Zinc Coating Thickness Requirements: ASTM A vs. F Dimension. ASTM A ASTM F Avg. Coating. Thickness of. Specimens. Tested. 23 Feb ASTM F covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special. 4 Jan 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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Vinay- ASTM A and A both say that the maximum service atm for galvanized bolts aetm not exceed F unless caution is used in regard to the potential for liquid hydrogen embirittlement. It is necessary for the galvanizer to communicate the bath temperature to the customer to ensure the end user understands the effects the galvanizing temperature will have on the steel. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
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Hot-Dip Galvanizing Specifications – Portland Bolt
F defines the two different lots and their associated sampling plans as follows: Galvanizing fasteners in accordance with A, will usually meet or exceed the requirements of F, because F defers to A in many sections. Phil- The hot dip galvanizing process is more or less the same within all of those standards, the difference is how they are handled.
Therefore, it must be clarified whether the plant has the ability to lubricate hardware after hot-dip galvanizing. On the other hand, if embrittlement testing is necessary under F, it is to be conducted per ASTM F a wedge positioned and tensioned under a bolt headwhich is a different method than any of the methods described within A Awtm 9.
Authored by Alana Hochstein. Furthermore, there are two types of production lots: For long pieces anchor rods or articles greater than five feet in lengthcoating thickness measurements must be taken on each end and in the middle of the article. A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers. F2392 you are concerned about the hardness dropping, you could look at alternatives platings that do not require heat, like mechanical galvanizing.
According to F Paragraph 5. The type of production lot process will determine which column should be referenced for the sample size of each inspection criteria, as summarized in the table below, or per the F Sampling Plan Flow Chart.
Combining values from the two systems may result in non-conformance with the standard. A summary f232 the numerical differences between the two specifications related to coating thickness requirements for all materials is presented in the table: This specification is intended to be applied to hardware items that are centrifuged or otherwise handled to remove excess zinc.
It also provides for minor coating repairs. Coating Thickness Table 2 of F lists average coating thickness requirements for production lots, batch lots, and individual specimens.
ASTM F vs. ASTM A | American Galvanizer’s Association
If your requirement is for hot dip galvanizing, electroplating would not be sufficient. The batch lot inspection process is more similar to atm under V2329 than inspection of production lots, but Table 1 of F has some additional requirements to consider. A and F again are more or less the same, F g2329 back to the processes in A, but goes into more detail with respect to the specifics of threaded fasteners.
The temperatures used in the hot-dip galvanizing process typically do not appreciably alter the mechanical properties of steel, but there are some instances when there are potential concerns.
To determine how many samples are required to test for conformance based on the lot size, F refers to Table 3 of F, Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection.
Could you please clarify? It is not a dip spin coating like hot dip galvanizing is. Electroplating is an entirely different process and is a much thinner coating. 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.
Anyone making use of this information assumes all liability arising from such use. It is important to ensure the customer specifies which type of lot is required.
Hot-Dip Galvanizing Specifications
Ast, shall furnish certified test results from which the shipping lots originated. Also, A and F have different sampling requirements; F requires more samples per lot than A Leave this field empty.
Link to Active This link will always route to the current Active version of the standard. 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.
If certified test reports are not available, then the supplier must default to Sample Size C and conduct the tests required.
Gagan- Sometimes the heat from the hot dip galvanizing operation can slightly soften small hardened items like this. Work Item s – proposed revisions of this standard.