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 – Portland Bolt
Since the bolts are pre-tensioned, will there be any issues with Magni with regard to pre-tensioning i. This abstract is a brief summary of v1136 referenced standard. No metric equivalents are presented in this specification. Parham- We cannot make specific recommendations, but I can say that painting A bolts is quite common. We also see no issues with pre-tensioning. If so, did the tension will be higher?
But there are some doubts. The corrosion protection offered by F in those cases would be superior to nothing satm all. 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. Alkaline cleaning or vapor degreasing is required along with shot blasting to remove rust or scale.
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. The bolts and nuts are already coated with Dacromet and the proposal is to coat the DTI washers with Magni Hot-dip galvanized hex nuts are therefore tapped oversize to accommodate the thick coating, whereas F specifically states that the thread fit shall not be adversely affected.
We assumed that the properties on the bolts is not affected but the final tension might be change? Leave a Reply Cancel reply Your email address will not be published.
Work Item s – proposed revisions of this standard.
High Strength Bolts Coatings
Pierre-Paul — The properties of the bolt and the final tension should not be impacted. F Grade 3, commonly known as Dacromet.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard. No other units of measurement are included in this standard. 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.
Your email address will not be published. Since the Dacromet and Magni will be in contact with one another, Are they compatible with one another? Bandana- There are no c1136 mixing coatings with DTI washers. Leave this field empty.
Consulting a structural engineer involved on the project is always the best solution. 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.
The basecoat can contain chrome C or be non-chrome NC. Is fluorocarbon coating acceptable to A bolts for corrosion prevention? 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.
Protective Coatings ASTM recommends that if a protective coating astj required for A r1136, one of two approved coatings is recommended.
So what are the alternatives to provide corrosion resistance for A structural bolts? 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.
Is the coating that fragile? Your first question, is it appropriate to specify ASTM F Grade 3would be best answered by an engineer familiar with the coating and the application.
One year after installation the bolts are rusting. This fastener is made from weathering steel which is inherently corrosion resistant.
We are not sure how fragile the coating is during installation. I do not have any friction coefficient information on Magniso I do not know how much the torque will be affected. Serge- We have very little experience with Dacromet coating.
It is required that the bolt and nut are coated by the same process, but the washer can be an alternate coating. 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 ast, determine the applicability of regulatory limitations prior to use.
Historical Version s – view previous versions of standard. The tightening torque may vary from plain finish or other coatings, but the f113 should still function the ff1136.
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. That said, I do not know much about fluorocarbon coatings and how they are applied. Since we are using A bolts in our structure, we have to propose a replacement. What corrosion-resistant coatings f1136 available for high-strength over ksi bolts? However, these fasteners are not as readily available in the marketplace as A Type 1.
Depending on the amount of corrosive forces at work in the application, F may be sufficient, but it may not. 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.
As for the thickness of both coatings, F grade 3 specified a coating thickness of 0.