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.
|Published (Last):||11 October 2004|
|PDF File Size:||18.28 Mb|
|ePub File Size:||1.47 Mb|
|Price:||Free* [*Free Regsitration Required]|
These instances can include when steel has been severely work hardened or when the galvanizing bath temperature exceeds the stress relief or tempering temperatures of the fasteners.
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. Best practice is to note the bath temperature when galvanizing steel to F, although only the average bath temperature is required. Your email address will not be published. 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.
The amount of additional documentation beyond ASTM A requirements will vary depending on a number of optional requirements the customer can specify under F It is not a dip spin coating like hot dip galvanizing is. For example, a lot size of articles under the detection process requires testing of 11 samples for coating thickness, 11 samples for visual appearance, and 3 samples for adhesion.
Table 2 of F lists average coating thickness requirements for production lots, batch lots, and individual specimens. Phil- The hot dip galvanizing process is more or less the same within all of those standards, the difference is how they are handled. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Historical Version s – view previous versions of standard.
Quenching According to F Paragraph 5. Also in which material we are coating or galavanizing. Each bolt specification may list additional methods to prevent hydrogen embrittlement as well as place additional requirements on embrittlement testing which should be researched separately. A summary of the numerical differences between the two specifications related to coating thickness requirements for all materials is presented in the table: Nails and rivets are not included in F Could you please clarify?
Hot-Dip Galvanizing Specifications – Portland Bolt
F defines the two different lots and their associated sampling plans as follows: The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers. Nails and rivets are not included in this specification. The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for:. Since threaded fasteners are spun at high speeds in a centrifuge to remove excess zinc from the threads, they would fall under the A class C specification.
Hot-Dip Galvanizing Specifications
If the customer ast, the galvanizer will be required to provide the average galvanizing temperature the fasteners will be exposed to. All the ASTM fastener standards refer to F for hot dip galvanizing, so that would be the most appropriate standard to reference.
ASTM A does not cover threaded bolts and fasteners. It is necessary for the galvanizer to communicate the bath temperature to the customer to xstm the end user understands the effects the galvanizing temperature will have on the steel. Link to Active This link will always route to the current Active r2329 of the standard.
This ASTM specification covers zinc coatings applied by the hot-dip process on iron and steel hardware. Electroplating is an entirely different process and is a much thinner coating. ASTM A A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers. 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.
Leave this field empty. The zinc used for the coating shall conform to the chemical composition required. Otherwise, a third xstm will be required to apply the lubricant at an additional cost.
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.
It also provides for minor coating repairs. Anyone making use of this information assumes all liability arising from such use. 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.
The acceptance number in all cases is zero defects. April 10, Authored by Bernardo A.
Therefore, it must be clarified whether the plant has the ability to lubricate g2329 after hot-dip galvanizing. Work Item s – proposed revisions of this standard.
Afif — The difference between hot dip galvanizing structural articles and fasteners is asgm spinning. One of our experienced sales reps will be happy to answer any of your questions.