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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Each bolt specification may list f23299 methods to prevent hydrogen embrittlement as well as place additional requirements on embrittlement testing which should be researched separately.
ASTM F vs. ASTM A | American Galvanizer’s Association
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Contact us if you have a need for hot-dip galvanized fasteners or with any technical questions regarding hot-dip galvanizing.
The standard specification that covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process. Galvanizing fasteners in accordance with A, will usually meet or exceed the requirements of F, because F defers to A in many sections.
Hot-Dip Galvanizing Specifications
d2329 If the customer specifies, the galvanizer will be required to provide the average galvanizing temperature the fasteners will be exposed to. Beams and structural members are defined as steel products and are galvanized per A This ASTM specification covers zinc coatings applied by the hot-dip process on iron and steel hardware.
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 Paragraph 9. Leave a Reply Cancel reply Your email address will not be published.
ASTM F – Portland Bolt
April 10, Authored by Alana Hochstein. Could you please clarify? According to Note C of Table 1, It is only required to conduct testing on samples for coating thickness once every five batch lots.
The information provided herein is not intended as a representation or warranty on the part of the AGA. The batch lot inspection process is more similar to inspection under A than inspection of d2329 lots, but Table 1 of F has some additional requirements to consider. F defines the two different lots and their associated sampling plans as follows:.
The zinc used for the coating shall conform to the chemical composition required.
Spinning removes excess zinc from the fastener so that the nut will mate with the bolt. This specification covers the requirements for hot-dip galvanizing on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips. ASTM F describes two different sampling plans for batch lots and production lots.
It is not a dip spin coating like hot dip galvanizing is. Asttm to F Paragraph 5. 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. Quenching According to F Paragraph 5. Suppliers shall furnish certified test results from which the shipping lots originated. The values stated in each system may not v2329 exact equivalents; therefore, each system shall be used independently of the other.
There are three columns listing the number of test articles for three different inspection tests required under F This specification is intended to be applied to hardware items that are centrifuged or otherwise handled to remove excess zinc.
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. The amount of additional documentation beyond ASTM A requirements will vary depending on a number of optional requirements the customer can specify under F All the ASTM fastener standards refer to F for hot dip galvanizing, so that would be the most appropriate standard to reference.
Otherwise, a third party will be required to apply the lubricant at an additional cost. Authored by Alana Hochstein.
Leave this field empty. Vinay- ASTM A and A both say that the maximum service temperature for galvanized bolts should not exceed F unless caution is used in regard to the potential for liquid hydrogen embirittlement. April 10, Authored by Bernardo A. 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.
ASTM A This specification covers the requirements for hot-dip galvanizing on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.
ASTM F2329 vs. ASTM A153
This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. Also in which material we are coating or galavanizing.
This specification covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process.
Therefore, it must be clarified whether the plant has the ability to lubricate hardware after hot-dip galvanizing. 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.
See excerpt of Table 1 below. Gagan- Sometimes the heat from the hot dip galvanizing operation can slightly soften small hardened items like this. This abstract is a brief summary of the referenced standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
However, if a purchaser also requires the galvanizer to inspect dimensional requirements of parts upon delivery, they must provide the galvanizer with the necessary tools and inspection gauges. Compared to the sampling plan in A, F requires fewer samples per batch lot size, but the galvanizer is required to also asgm adhesion testing and visual inspection for appearance on these test articles as defined by Asm 1.
Dane- Thanks for response. The two specifications have virtually identical f23299 thickness requirements.
Afif — The difference between hot dip galvanizing structural articles and fasteners is the spinning. A summary of the numerical differences between the two specifications related to coating thickness requirements for all materials is presented in the table: It is intended to be applicable to fasteners that are centrifuged or otherwise handled to remove excess zinc. The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for: 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.