Zinc Coating Thickness Requirements: ASTM A vs. F Dimension. ASTM A ASTM F Avg. Coating. Thickness of. Specimens. Tested. ASTM F covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special. 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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Thus, the thickness determined is a point value. 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.
Minor roughness that does not impair the intended use of the part, or roughness that is related to the uncoated surface condition of the part, shall not constitute grounds for rejection of the parts. If required by the product standard or by the purchaser, mechanical descaling with or without? Historical Version s – view previous versions of standard.
ASTM F vs. ASTM A | American Galvanizer’s Association
Many thanks Sal from Dubai. Your email address will not be published. Parts may be dull due to the presence of silicon in the steel. If the galvanizing process is carried out at a higher temperature than the stress relief or the tempering temperature of the fasteners, than the purchaser shall make provision for mechanical testing. 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.
Also, A and F have different sampling requirements; F requires more samples per lot than A See excerpt of Table 1 below. The method for testing the condition of adherence is speci? Nails and rivets are not included in F Also a high tension rod U Bolt 14mm diameter and 2 meters in length also with its respective fasteners.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Table 2 of F lists average coating thickness requirements for production lots, batch lots, and individual specimens.
April 10, Authored by Bernardo A. All inspections and tests shall be made at the place of manufacture prior to shipments, unless otherwise speci? I am having difficulty determining the hot dip zinc coating needed for an anchor bolt 60M 60mm and 1. If your requirement is for hot dip galvanizing, electroplating would not be sufficient.
Unless otherwise agreed to in the purchase order, delivered galvanized washers shall not be bonded to each other. The number of specimens to be tested per order shall be as speci?
Therefore, the supplier of the fasteners submitting the product to the galvanizer shall be aware of the tempering temperature of the fasteners relative to the temperature of the galvanizing bath and the potential effect it may have on the product. The major differences between the two specifications, described below, include topics related to sampling protocol, coating thickness, inspection, embrittlement, and documentation.
ASTM F – Portland Bolt
According to F Paragraph 5. 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. Because A does not require water quenching nor chemical post-treatments, communication between ast 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.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Anyone making use of this information assumes all liability arising from such use. Rob- Tensioning the bolt will not adversely affect the galvanizing. Sal- Are you asking which galvanizing standard you should be using?
Therefore, it must be clarified whether the plant has the ability to lubricate hardware after hot-dip galvanizing.
Hot-Dip Galvanizing Specifications
The packaging shall comply with the purchaser requirements. It does not cover threaded fasteners that are centrifuged or otherwise handled to remove excess zinc. ASTM A A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers. 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.
For test method, see Quenching According to F Paragraph 5. Suppliers shall furnish certified test results from which the shipping lots originated. 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.
This specification is intended to be applied to hardware items that are centrifuged or otherwise handled to remove excess zinc.
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 Will galvanizing bolts, that will be used for Sub-Sea hydratightightening using AquaMax jacks permissible, or would the stretching of the bolt under tension remove the galvanized warranty.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. 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.
This ASTM specification covers zinc coatings applied by the hot-dip process on iron and steel axtm. We are are not certain what standards are commonly used in Dubai, so we cannot speak to those. These requirements are established by the applicable product standard, t2329 as Speci? ASTM A does not cover threaded bolts and fasteners. Portland Bolt performs hot dip galvanizing of threaded fasteners within our 85, square foot manufacturing facility. The information provided herein is not intended as a representation or warranty on the part of the AGA.
A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers. The two specifications have virtually identical coating thickness requirements. Nails and rivets are not included in this specification.
C Coating thickness frequency of measurements: All the ASTM fastener standards refer to F for hot dip galvanizing, so that would be the most appropriate standard to reference.