ASTM F2329-2005(2011) Standard Specification for Zinc Coating Hot-Dip Requirements for Application to Carbon and Alloy Steel Bolts Screws Washers Nuts and Special Threaded Fastener.pdf

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1、Designation: F2329 05 (Reapproved 2011)Standard Specification forZinc Coating, Hot-Dip, Requirements for Application toCarbon and Alloy Steel Bolts, Screws, Washers, Nuts, andSpecial Threaded Fasteners1This standard is issued under the fixed designation F2329; the number immediately following the de

2、signation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers th

3、e requirements for hot-dipzinc coating applied to carbon steel and alloy steel bolts,screws, washers, nuts, and special threaded fasteners appliedby the hot-dip coating process. Nails and rivets are notincluded in this specification.1.2 It is intended to be applicable to fasteners that arecentrifuge

4、d or otherwise handled to remove excess galvanizingbath metal (free zinc).1.3 The values stated in inch-pound units are to be regardedas standard. No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated wi

5、th its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A153/A153M Specification for Zinc Coating (Hot-Dip) onIron and Ste

6、el HardwareA563 Specification for Carbon and Alloy Steel NutsB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination of CrossSectionE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy-Current (Electromagnetic) Exami-nation MethodsF606 Test

7、 Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, Direct Tension Indicators, and RivetsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical Fasteners3. Termi

8、nology3.1 Terms used in this specification are defined in Termi-nology F1789 unless otherwise defined in this specification.3.1.1 batch lotquantity of identical parts cleaned, pickled,fluxed, and galvanized together at one time in a galvanizingbasket.3.1.2 galvanizinghot-dip zinc coating.3.1.3 high

9、temperature galvanizinggalvanizing processcarried out in a ceramic vessel (kettle) at an approximatetemperature ranging between 990 and 1040F.3.1.4 hot-dip zinc coating of mechanical fastenersprocesswhereby fasteners are zinc coated by immersion in a bath ofmolten zinc, resulting in the formation of

10、 the iron/zinc alloycoating and a zinc coating at the surface of the fastener. Thisprocess involves the removal of excess zinc by spinning theparts in a centrifuge, or brushing the threaded portion, orhandling otherwise to remove the excess zinc.3.1.5 production lotbatches of parts originating from

11、thesame manufacturing lot, processed continuously through clean-ing, pickling, fluxing, dipping in molten zinc and spun in acentrifuge, or other means, without any significant change intime, temperature, and concentration of the constituents of theprocess.3.1.6 stress reliefprocess of heating parts

12、for a definitetime at a given temperature in order to relieve stress induced bywork hardening.4. Ordering Information4.1 Orders for zinc coating of fasteners to this specificationshall include the following:4.1.1 Name of product (that is bolt, stud, nut, washers, orother);4.1.2 ASTM designation and

13、year of issue, including fas-tener specification number;4.1.3 Hydrogen embrittlement relief, as required by thepurchaser see, 7.2.3;1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on Coatings onFasteners.Current

14、edition approved May 1, 2011. Published June 2011. Originallyapproved in 2005. Last previous edition approved in 2005 as F2329-05. DOI:10.1520/F2329-05R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM

15、Standards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.4 Quantity of fasteners to be hot-dip zinc coated;4.1.5 Stress relief or tempering temp

16、erature to which thefasteners where subjected, if applicable;4.1.6 Secondary processing such as chromating, phosphat-ing, or lubrication, if applicable;4.1.7 Average galvanizing temperature to which fastenerswill be subjected, if required by the purchaser (see 7.2.2);4.1.8 Specify baking if required

17、 (see 7.2.3); and4.1.9 Certification, if required (see 14.1).5. Materials and Manufacture5.1 Condition of the As-Received FastenersThe fastenersas received by the galvanizer shall be free from contaminantsthat are not readily removed in the cleaning process and wouldadversely affect the galvanizing.

18、5.2 ProcessUnless otherwise covered in this specifica-tion, all processing parameters shall be in accordance with therequirements of Specification A153/A153M.5.2.1 Process ControlGalvanized fasteners subjected to aprocess control plan based upon batch lot level shall complywith the batch lot samplin

19、g plan in Table 1, and the samplingplan for production lot (prevention process) as determined in10.2.2 shall be applied.5.3 Spinning and Quenching:5.3.1 Parts shall be spun immediately following removalfrom the galvanizing bath and quenched in water. In addition,small parts shall be air cooled, as n

20、eeded, in order to preventthe formation of zinc oxide.5.3.2 Parts, which cannot be spun shall be brushed orhandled otherwise to remove the excess zinc.5.4 Alteration of Threaded Fasteners:5.4.1 Fasteners that have been hot-dip galvanized shall notbe further altered (such as subjected to a cutting, r

21、olling,finishing-tool operation) by the galvanizer unless specificallyauthorized in writing by the purchaser.5.4.2 Hot-dip galvanizing of externally threaded fastenersshall meet the thread fitting requirements of the specifiedproduct standard or specific allowance as determined by thecustomer.NOTE 1

22、The scope of this specification does not cover the require-ments regarding the overtapping of galvanized nuts. These requirementsare established by the applicable product standard, such as SpecificationA563 (or others), or in writing by the purchaser, if needed.5.5 Secondary Processing:5.5.1 When re

23、quested by the purchaser, treatments such aschromating or phosphating shall be applied to reduce thepossibility of wet storage staining (white corrosion) or to assistsubsequent painting.5.5.2 When specified on the purchase order, the nuts, bolts,or screws shall be lubricated to enhance assembly.6. C

24、hemical Composition of Zinc6.1 Unless otherwise specified in the product standard, thezinc used for the coating shall conform to the requirements ofthe section on Zinc of Specification A153/A153M.7. Safeguards Against Alteration of Fasteners MechanicalProperties7.1 Stress ReliefFasteners subjected t

25、o severe work hard-ening shall be stress-relieved by the fastener manufacturerprior to hot-dip zinc coating (galvanizing).7.2 Hot-Dip Zinc Coating:7.2.1 Effect of Temperature on Mechanical Properties:7.2.1.1 Galvanizing carried out at a temperature above800F can adversely affect the final mechanical

26、 properties ofthe fasteners. Therefore, the supplier of the fasteners submit-ting the product to the galvanizer shall be aware of thetempering temperature of the fasteners relative to the tempera-ture of the galvanizing bath and the potential effect it may haveon the product. When requested by the p

27、urchaser, the averagegalvanizing temperature that the fasteners will be subjected toshall be furnished.7.2.1.2 Unless otherwise required by the product standard orby the purchaser, testing for mechanical properties is notnecessary if the galvanizing process is carried out at a lowertemperature than

28、the stress relief or tempering temperature ofthe fasteners. If the galvanizing process is carried out at ahigher temperature than the stress relief or the temperingtemperature of the fasteners, than the purchaser shall makeprovision for mechanical testing.7.2.1.3 Threaded fasteners made from carbon

29、or alloy steelheat treated to a minimum specified hardness of 40 HRC, orcase hardened steel fasteners shall not be hot-dip zinc coated.7.2.2 Effect of Hydrogen on the Mechanical Properties afterGalvanizing Hydrogen has the potential of being introducedinto the steel during acid pickling, prior to ho

30、t-dip galvanizing.For high strength fasteners (having a specified minimumproduct hardness of 33 HRC), there is a risk of internalhydrogen embrittlement. If required by the product standard orby the purchaser, mechanical descaling (with or without flashpickling) or baking shall be conducted to reduce

31、 the risk ofinternal hydrogen embrittlement. Baking shall be conductedafter pickling and prior to hot-dip galvanizing.7.2.3 Effect of the Galvanizing TemperatureExternallythreaded ferrous fasteners over 1.00 in. diameter with aspecified minimum hardness of HRC 33 and higher shall not behot-dip zinc

32、coated at high temperature (see definition in 3.1.3)in order to avoid microcracks.8. Coating and Dimensional Requirements8.1 Coating ThicknessThe zinc coating thickness shallmeet the requirements of Table 2.TABLE 1 Process Control of Batch LotASampling PlanSample SizeBBatch Lot Size Average CoatingT

33、hicknessCAdhesion AppearanceD5to25 1 1 126 to 50 1 1 251 to 150 2 1 2151 and over 2 2 2AThe acceptance criterion in all cases is zero defects.BThe sample size is the number of specimen(s) required to be tested/inspectedto the applicable criteria.CCoating thickness frequency of measurements: one set

34、of specimen(s) forevery five batch lots. For test method, see 11.1.DVisual inspection for conformance.F2329 05 (2011)28.2 DimensionThe dimensional characteristics of the fas-teners shall be in accordance with the requirements of thepurchaser, when specified in the order. The purchaser shallensure th

35、at the effect of the heat generated by the galvanizingprocess is compatible with the fastener regarding the finaldimensional characteristics of the parts. Furthermore, thegalvanizer shall not be held responsible for any unanticipateddistortion of parts. In addition, the purchaser shall providefasten

36、ers having sufficient dimensional allowance to accom-modate the zinc thickness deposition, as required in 8.1.8.3 Adhesion of Zinc CoatingThe zinc coating shalladhere tenaciously to the surface of the base metal. The methodfor testing the condition of adherence is specified in 11.5.9. Workmanship, F

37、inish, and Appearance9.1 Appearance of Zinc Coating:9.1.1 After hot-dip galvanizing, the fasteners shall meet therequirements of the section on Workmanship, Finish, andAppearance of Specification A153/A153M. Galvanized wash-ers shall not be bonded to each other (See Note 2). Parts maybe dull due to

38、the presence of silicon in the steel. The dullappearance shall not be cause for rejection.NOTE 2Hot-dip washers tend to bond to each other. Suitable accep-tance criteria shall be agreed between the purchaser and the galvanizerbefore placing the order. Unless otherwise agreed to in the purchase order

39、,delievered galvanized washers shall not be bonded to each other.9.1.2 The test method shall be in accordance with 11.3.9.2 Smoothness of Zinc Coating:9.2.1 The zinc coating shall be smooth and reasonablyuniform in thickness, as defined in the section on Workman-ship, Finish, and Appearance of Speci

40、fication A153/A153M.Smoothness of a surface is a relative term. Minor roughnessthat does not impair the intended use of the part, or roughnessthat is related to the uncoated surface condition of the part,shall not consititue grounds for rejection of the parts.9.2.2 The test method shall be in accord

41、ance with 11.3.10. Sampling10.1 Test specimens shall be selected at random from eachproduction lot or batch lot, when applicable.10.2 Selection of the Sampling PlanProduction LotTwosampling plans are proposed, one based on detection processand one based on prevention process as defined in Terminolog

42、yF1789. The selection of the sampling plan shall be in accor-dance with Guide F1470.10.2.1 Production LotDetection ProcessSampling forcoating thickness and for visual appearance shall be conductedin accordance with Table 1, Sample Level A, and Table 3,Sample Size A, of Guide F1470. Sampling for adhe

43、sion testshall be in accordance with Table 1, Sample Level C, and Table3, Sample Size C, of Guide F1470.10.2.2 Production LotPrevention ProcessSampling forcoating thickness and for visual appearance shall be conductedin accordance with Table 2, Sample Level B, and Table 3Sample Size B, of Guide F147

44、0. Sampling for adhesion testshall be in accordance with Table 2, Sample Level D, and Table3, Sample Size D, of Guide F1470.11. Test Methods11.1 Tests shall be made to ensure that the zinc coating isbeing furnished in accordance with this specification and asspecified for the following:11.2 Coating

45、Thickness:11.2.1 Average Coating Thickness on an Individual Speci-men:11.2.1.1 To calculate the average coating thickness of onespecimen, a minimum of five readings shall be taken. In casethe geometry of the specimen does not permit five readings,five test specimens shall be used to establish the av

46、eragereading.11.2.1.2 The determination of the coating thickness shall bemade on a portion of the fastener that does not include anythreads in accordance with Practice E376.11.2.1.3 In case of arbitration, the thickness of coating shallbe determined by cross section and optical measurement, inaccord

47、ance with Test Method B487. Thus, the thicknessdetermined is a point value. No less than five measurementsshall be made at locations on the test specimen, which are aswidely dispersed as practical, so as to be representative of thewhole surface of the test specimen. The average of thoseselected meas

48、urements is the average coating thickness.11.3 Finish and AppearanceFinish and appearance shallbe visually inspected.TABLE 2 Zinc Coating ThicknessMinimum Thickness on SurfaceDimensionAAverage Thickness of AllSpecimens Tested(Production Lot)BAverage Thickness of AllSpecimens Tested(Batch Lot)CAverag

49、e Thickness ofIndividual SpecimenFasteners and nuts over38 in. in diameterWashers316 in. and14 in. in thickness0.0020 in. 0.0017 in. 0.0017 in.Fasteners and nuts38 in. and under in diameterWashers under316 in. in thickness0.0017 in. 0.0015 in. 0.0015 in.AIn the case of long pieces, such as anchor rods and similar articles over 5 ft in length, the thickness measurement shall be determined at each end and the middleof the article. In the case of a fully threaded rod, the thickness measurements shall be determined at each end of the article. In no case shal