This standard is issued under the fixed designation F ; the 1 This specification is under the jurisdiction of ASTM Committee F16 on. ASTM: F – Standard Specification for Chromium/Zinc Corrosion Protective Coatings for Fasteners. 1. Scope This specification covers the basic. ASTM F/FM Standard Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners. standard by ASTM.
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High Strength Bolts Coatings
Work Item s – proposed revisions of this standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for aztm use and application. Is the coating that fragile? Consulting a structural engineer involved on the project is always the best solution. 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. It is required that the bolt and nut are coated by the same process, but the washer can be an alternate coating.
They were used to in flange type splices of two tubular monopole sections.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Hot-dip galvanized hex nuts are therefore tapped oversize r1136 accommodate the thick coating, whereas F specifically states that the thread fit shall not be adversely affected.
Bandana- There are no issues mixing coatings with DTI washers. Your first question, is ff1136 appropriate to specify ASTM F Grade 3would be best answered by an engineer familiar with the coating and the application.
We also see no issues with pre-tensioning. Serge- We have very little experience with Dacromet coating. We assumed that the properties on the bolts is not affected but the final tension might be change?
The coatings are classified into six grades Grades 1 to 6 according to the required minimum basecoat thickness, and when tested, shall conform accordingly to appearance, adhesion, corrosion astj, blister, thread fit, and hydrogen embrittlement requirements. As for the thickness of both coatings, F grade 3 specified a coating thickness of 0. The tightening torque may vary from plain finish or other coatings, but the bolt should still function the same.
Jovito- We would be happy to quote your specific bolting needs if you want to send us a list of the bolts you are looking for. Link to Active This link will always route to the current Active version of the standard. Parham- We cannot make specific recommendations, but I can say that painting A bolts is quite common. That said, I do not know much about fluorocarbon coatings and how they are applied.
I am using A grade BC and need a smooth finish with minimal irregularities. Although hot-dip galvanize provides high thickness level barrier protection 2 mils for substrates, it is not approved for use on high strength bolts because hot dip galvanize is susceptible of hydrogen embrittlement and cracking of fasteners that can result out in the field. Leave this field empty. Satm suppose they are similar to painting.
Since the bolts are pre-tensioned, will there be any issues with Magni with regard to pre-tensioning i. So what are the alternatives to provide corrosion resistance for A structural bolts?
Is fluorocarbon coating acceptable asm A bolts for corrosion prevention? Alkaline cleaning or vapor degreasing is required along with shot blasting to remove rust or scale.
The corrosion protection offered by F in those cases would be superior to nothing at all. Hi, Recently we were informed that Dacromet coating is being phased out. We are not sure how fragile the coating is during installation. The bolts and nuts are already coated with Dacromet and the proposal is to coat the DTI washers with Magni The coating process does not induce the possibility of internal hydrogen embrittlement provided that the fasteners have not been cleaned or pre-treated with an acid or phosphate.
Due to hydrogen embrittlement concerns ASTM recommends against hot-dip galvanizingmechanical deposition, or electroplating with zinc or other metallic coatings on high strength bolts ultimate tensile strengths that exceed ksi. Since the Dacromet and Magni will be in contact with one another, Are they compatible with one another? This fastener is made from weathering steel which is inherently corrosion resistant. Normally where I see F specified is in applications with higher strength fasteners that cannot be hot-dip galvanized, such as ASTM A heavy hex bolts.
Hello, We have specified A Dracomet coated bolts for a telecommunications monopole in Canada. 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.
I do not have any friction coefficient information on Magniso I do not know how much the torque will be affected. Historical Version s – view previous versions of standard. Depending on the amount of corrosive forces at work in the application, F may be sufficient, but it may not. This abstract is a brief summary of the referenced standard.
High Strength Bolts Coatings – Portland Bolt
But there are some doubts. Pierre-Paul — The properties of the bolt and the final tension should not be impacted. A coatings engineer may choose to allow an exception in some cases, but ASTM will not officially sanction any coatings that are not approved by the F16 committee. If so, did the tension will be higher?
Leave a Reply Cancel reply Astn email address will not be published. Since we are using A bolts in our structure, we have asym propose a replacement. Protective Coatings ASTM recommends that if a protective coating is required for A bolts, one of two approved coatings is recommended. No other units of measurement are included in this standard. The basecoat can contain chrome C or be non-chrome NC.
What corrosion-resistant coatings are available for high-strength over ksi bolts?