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):||17 November 2004|
|PDF File Size:||7.35 Mb|
|ePub File Size:||13.53 Mb|
|Price:||Free* [*Free Regsitration Required]|
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. It is important to ensure the customer specifies which type of lot is required. If f232 requirement is for hot dip galvanizing, electroplating would not be sufficient.
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 If you are concerned about the hardness dropping, you could look at alternatives platings that do not require heat, like mechanical galvanizing.
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.
Leave this field empty. Gagan- Sometimes the heat from the hot dip galvanizing operation can slightly soften small hardened items like this. 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. If certified test reports are not available, then the supplier must default to Sample Size C and conduct the tests required.
Vinay- ASTM A and A both say that the maximum service temperature for galvanized bolts should not exceed Asstm unless caution is used in regard to the potential for liquid hydrogen embirittlement.
The major differences between the two specifications, described below, include topics related to sampling protocol, coating thickness, inspection, embrittlement, and documentation. Spinning removes excess asym from the fastener so that the nut will mate with the bolt. Furthermore, there are two types of production lots: 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.
It is not a dip spin coating like hot dip galvanizing is. On the other hand, if embrittlement testing is necessary under F, it is to be conducted per ASTM Asstm a wedge positioned and f3229 under a asm headwhich is a different method than any of the methods described within A Paragraph 9. This ASTM specification covers zinc coatings applied by the hot-dip process on iron and steel hardware.
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. Otherwise, a third party will be required to apply the lubricant at an additional cost.
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.
According to F Paragraph 5. Work Item s – proposed revisions of this standard. The differences in the types d2329 lots entail different sampling plans, which specify the number of test articles for performing various test methods during inspection of the finished product.
Because T2329 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.
It is important to note the acceptance criterion in all cases is zero defects. If the customer specifies, the galvanizer will be required to provide the average galvanizing temperature the fasteners will be exposed to.
One of our experienced sales reps will be happy to answer any of your questions. ASTM A A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers. The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for: F defines the two different lots and their associated sampling plans as follows: Nails and rivets are not included in this specification.
Anyone making use of this information assumes all liability arising from such use. Your email address will not be published.
ASTM F vs. ASTM A | American Galvanizer’s Association
It does not cover threaded fasteners that are centrifuged or otherwise handled to remove excess zinc. Leave a Reply Cancel reply Your email address will not be published. There are three columns listing the number of test articles for three different inspection tests required under F Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The standard asmt 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 f22329 the hot-dip coating process.
The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
ASTM F2329 vs. ASTM A153
Asm 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. All the ASTM fastener standards refer to F for hot dip galvanizing, so that would be the most appropriate standard to reference. 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.
Suppliers shall furnish certified test results from which f2239 shipping lots originated. Coating Thickness Table 2 of F lists average coating thickness requirements f23229 production lots, batch lots, and individual specimens.
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. Historical Version aatm – view previous versions of standard.
These instances can include when steel has been severely work hardened or when the galvanizing bath temperature exceeds the stress adtm or tempering temperatures of the fasteners. Also, A and F have different sampling requirements; F requires more samples per lot than A The zinc used for the coating shall conform to the chemical composition required. ASTM F describes two different sampling plans for batch lots and production lots. Dane- Thanks for response.