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. ASTM F – Download as PDF File .pdf), Text File .txt) or read online.
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If certified test reports are not available, then the supplier must default to Sample Size C and conduct the tests required. Best practice is to note astm f2329 bath temperature when galvanizing steel astm f2329 F, although only the average bath temperature is required.
This abstract is a brief summary of the referenced standard. This method is similar to an inspection of coating thickness on multi-specimen articles galvanized per ATSM A Adhesion testing g2329 not typically performed when galvanizing to the requirements of A unless there is evidence of astm f2329 adhesion concern, but F requires adhesion testing stout knife test to be astm f2329 for the number of articles listed in Table 1, and for every batch lot.
Galvanizing astm f2329 in accordance with A, will usually meet or exceed the requirements of F, because F defers to A in many sections.
However, if a purchaser also requires astm f2329 galvanizer to inspect dimensional requirements of parts upon delivery, they must provide the galvanizer with the astm f2329 tools and inspection gauges. Authored by Alana Hochstein.
It is important to note the acceptance criterion in all cases is zero defects. It is important to ensure the customer specifies which type of lot is required. Coating Thickness Table 2 of F lists average coating thickness requirements for production lots, batch lots, and individual specimens.
Because A does not require water quenching nor chemical post-treatments, communication between the customer and the galvanizer is required astm f2329 determine whether the galvanizer has a quench tank and the capability astm f2329 perform chemical post-treatments, or if air-cooling will be acceptable. It is necessary astm f2329 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 zinc used for the coating shall conform to the chemical composition required. The batch lot inspection process is more similar to inspection under A than inspection of production lots, but Table 1 of F has some additional requirements to consider. On astm f2329 other hand, astk embrittlement testing is astm f2329 under F, it is to be conducted per ASTM F a wedge positioned and tensioned under a bolt headwhich astm f2329 a different method than any of the methods described within A Paragraph 9.
It also provides for minor coating repairs.
ASTM F vs. ASTM A | American Galvanizer’s Association
The temperatures used astm f2329 the hot-dip galvanizing process typically do not appreciably alter the mechanical properties of steel, but there are some instances when there astm f2329 potential concerns.
See excerpt of Table 1 below. Nails and rivets are not included in this specification. If the customer specifies, the galvanizer will be required to provide the average galvanizing temperature the fasteners will be exposed to. ASTM F describes two different sampling plans for batch lots and production lots. Compared to the sampling plan in A, F requires fewer astm f2329 per batch lot size, but the galvanizer is required to also conduct adhesion testing and visual inspection for appearance on these test articles as defined by Table 1.
For example, a lot size astm f2329 articles under the detection process requires testing of 11 samples for coating thickness, 11 samples for visual appearance, and 3 samples for adhesion. It is informational only and not an official part of the standard; the full text astm f2329 the standard itself must be referred to for astm f2329 use and application.
Fasteners which are subjected to severe work hardening must be stress-relieved prior to galvanizing. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for: Each bolt specification may list additional methods to prevent hydrogen embrittlement as well asm place additional requirements on embrittlement testing which should be researched separately.
The amount of additional astm f2329 beyond ASTM A requirements will vary depending on astm f2329 number of optional requirements the customer can specify under F Suppliers shall furnish certified test results from which the shipping lots originated. F defines the two different lots and astm f2329 associated sampling plans as follows: The coating f23329 requirements astm f2329 A Table 1 meet or exceed those of F Table 2 except for:.
Table 2 of F lists average coating thickness requirements for production lots, batch lots, and individual specimens.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Astm f2329 long pieces anchor rods or articles greater than astm f2329 feet in lengthcoating thickness measurements must be taken on each end and in the middle of the article.
ASTM F – Portland Bolt
ASTM does not give any warranty express or implied astm f2329 make any representation that the contents of this astm f2329 are accurate, complete or up to date. Quenching According to F Paragraph atm. According to F Paragraph 5. The acceptance number in all cases is zero defects. Otherwise, a third party will be required to apply the lubricant at an additional cost. Zinc Coating Thickness Requirements: Link to Active This link will always route to the current Active version of the standard.
Work Item s – proposed revisions of this standard. According to Note C of Table 1, It astm f2329 only required to conduct testing on samples for coating thickness once every five batch lots.