1、BRITISH STANDARDBS EN ISO 10684:2004Fasteners Hot dip galvanized coatingsICS 21.060.01; 25.220.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Jul
2、y 2008Incorporating corrigendum BS EN ISO 10684:2004ISBN 978 0 580 63798 8National forewordThis British Standard is the UK implementation of EN ISO 10684:2004. It is identical with ISO 10684:2004, incorporating corrigendum July 2008.The UK participation in its preparation was entrusted by Technical
3、Committee FME/9, Nuts, bolts and accessories/Steering committee, to Subcommittee FME/9/1, Material.A list of organizations represented on this subcommittee can be obtained on request to its secretary.The UK as a member of CEN, is obliged to publish EN ISO 10684:2004 as a British Standard. However, a
4、ttention is drawn to the fact that during the development of this European Standard, the UK consistently voted against its approval as a European Standard for the following reasons:1. Clause 4.1 gives a silicon and phosphorous composition range (0.03 % to 0.13 %) where galvanizing at high temperatur
5、e is recommended. The UK committee believe that galvanizing at normal temperature can also be applied to this range if adequate precautions are taken.2. The UK committee disagree with the specified bath temperature range (455 to 480 C) in clause 5.5. The operating temperature of galvanizing baths in
6、 the UK is feasible at 440 to 465 C.3. Currently, there is no widely accepted adhesion test available at national or international level due to a lack of reproducibility. The issue regarding reproducibility would also apply to the test in Annex E.4. The committee believe that the maximum coating thi
7、cknesses in Tables 1 and 2 are too restrictive. It is quite possible that for any particular batch of material, coating thicknesses outside the ranges allowed can be produced.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correc
8、t application.Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on31 May 2006 BSI 2009Amendments/corrigenda issued since publicationDate Comments 30 November 2009 1,
9、column 12, for Pitch 5,5, 398 changed to 298Implementation of ISO corrigendum July 2008. Table EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 10684July 2004ICS 25.220.40; 21.060.01English versionFasteners - Hot dip galvanized coatings (ISO 10684:2004)lments de fixation - Revtements de galvani
10、sation chaud (ISO 10684:2004)Verbindungselemente - Feuerverzinkung (ISO 10684:2004)This European Standard was approved by CEN on 17 June 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a nati
11、onal standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any
12、other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, F
13、rance,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGMan
14、agement Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 10684:2004: EForeword This document (EN ISO 10684:2004) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in col
15、laboration with Technical Committee CEN/TC 185 “Threaded and non-threaded mechanical fasteners and accessories“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the late
16、st by January 2005, and conflicting national standards shall be withdrawn at the latest by January 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech R
17、epublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 10684:2004 has been approv
18、ed by CEN as EN ISO 10684:2004 without any modifications. BS EN ISO 10684:2004EN ISO 10684:2004Reference numberISO 10684:2004(E)INTERNATIONAL STANDARDISO10684First edition2004-07-15Fasteners Hot dip galvanized coatingslments de fixation Revtements de galvanisation chaud BS EN ISO 10684:2004EN ISO 10
19、684:2004iiBS EN ISO 10684:2004EN ISO 10684:2004iiiContents PageForeword iv1 Scope 12 Normative references . 13 Terms and definitions. 24 Materials. 34.1 Raw material of parts 34.2 Zinc. 35 Hot dip galvanizing procedures and precautions . 35.1 Stress relief 35.2 Cleaning and pickling. 35.3 Baking 35.
20、4 Fluxing 35.5 Hot dip galvanizing . 35.6 Spinning and quenching 45.7 Special requirements for nuts . 45.8 Post-treatment. 46 Requirements on thread tolerances and additional marking . 46.1 General. 46.2 Requirements and precautions in assembling hot dip galvanized threaded fasteners 46.3 Special re
21、quirements for marking when supplying fasteners in sealed containers 87 Mechanical properties of nuts tapped oversize and undersize threaded bolts, screws and studs. 88 Coating requirements . 88.1 Appearance of zinc coating . 88.2 Considerations for hot dip galvanized washers 88.3 Zinc coating thick
22、ness . 88.4 Adhesion of zinc coating 89 Lubrication. 910 Ordering requirements . 911 Designation 9Annex A (normative) Special requirements for bolts, screws and nuts with thread sizes M8 and M10 . 11Annex B (normative) Limits of sizes for hot dip galvanized internal and external screw thread M8 13An
23、nex C (informative) Calculation of minimum ultimate tensile loads and proof loads for bolts and screws M8 and M10 with threads undersized to tolerance class 6az 15Annex D (informative) Surface areas of bolts, screws and nuts . 16Annex E (normative) Adherence of hot-dip galvanized coating 19Annex F (
24、informative) Strength of hot dip galvanized bolt or screw and nut assemblies 20BS EN ISO 10684:2004EN ISO 10684:2004ivForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Stan
25、dards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also t
26、ake part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees
27、is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibil
28、ity that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 10684 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical properties of fasteners.BS EN ISO 1068
29、4:2004EN ISO 10684:20041Fasteners Hot dip galvanized coatings 1 Scope This International Standard specifies material, process, dimensional and some performance requirements for hot dip spun galvanized coatings applied to coarse threaded steel fasteners from M8 up to and including M64 and for propert
30、y classes up to and including 10.9 for bolts, screws and studs and 12 for nuts. It is not recommended to hot dip galvanize threaded fasteners in diameters smaller than M8 and/or with pitches below 1,25 mm. NOTE Attention is drawn to the fact that the proof loads and stresses under proof load of over
31、size tapped nuts with threads M8 and M10 and the ultimate tensile loads and proof loads of undersize threaded bolts and screws with threads M8 and M10 are reduced as compared to the values specified in ISO 898-2 and ISO 898-1 respectively and are specified in Annex A. It primarily concerns the spun
32、hot dip galvanizing of threaded steel fasteners, but it may also be applied to other threaded steel parts. The specifications given in this International Standard may also be applied to non-threaded steel parts such as washers. 2 Normative references The following referenced documents are indispensa
33、ble for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts,
34、screws and studsISO 898-2, Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse threadISO 965-1, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic dataISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of si
35、zes for general purpose external and internal screw threads Medium qualityISO 965-3, ISO general purpose metric screw threads Tolerances Part 3: Deviations for constructional screw threadsISO 965-4, ISO general purpose metric screw threads Tolerances Part 4: Limits of sizes for hot-dip galvanized ex
36、ternal screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizingISO 965-5, ISO general purpose metric screw threads Tolerances Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size o
37、f tolerance position h before galvanizingBS EN ISO 10684:2004EN ISO 10684:20042ISO 1460, Metallic coatings Hot dip galvanized coatings on ferrous materials Gravimetric determination of the mass per unit areaISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles Specifications an
38、d test methodsISO 2064, Metallic and other inorganic coatings Definitions and conventions concerning the measurement of thicknessISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic methodISO 8991, Designation system for fasteners3 Terms and definitions Fo
39、r the purposes of this document, the terms and definitions given in ISO 2064 (in particular, the definitions of significant surface, measuring area, local thickness, minimum local thickness and average thickness) and the following apply. 3.1batch quantity of identical parts cleaned, pickled, fluxed
40、and galvanized together at one time in a galvanizing basket 3.2production lot batches of parts originating from the same manufacturing lot, processed continuously through cleaning, pickling, fluxing, dipping in molten zinc and spun in a centrifuge without any change in temperature and concentration
41、of the constituents of the process 3.3batch average thickness calculated average thickness of a coating as if it was uniformly distributed over the surface of the parts of the batch 3.4baking process of heating parts for a definite time at a given temperature in order to minimize the risk of hydroge
42、n embrittlement 3.5stress relief process of heating parts for a definite time at a given temperature in order to relieve stress induced by work hardening 3.6hot dip galvanizing of fasteners process whereby steel fasteners are zinc coated by immersion in a bath of molten zinc, resulting in the format
43、ion of a zinc-iron alloy coating or a zinc-iron alloy coating plus a zinc coating at the surface of the fastener NOTE This process involves the removal of excess zinc by spinning the parts in a centrifuge or by an equivalent method. BS EN ISO 10684:2004EN ISO 10684:200434 Materials 4.1 Raw material
44、of parts 4.1.1 Chemical composition Materials as included in ISO 898-1 and ISO 898-2 are suitable for hot dip galvanizing except if the total content of phosphorus and silicon is between 0,03 % and 0,13 %, in which case high temperature galvanizing (530 C to 560 C) is recommended. 4.1.2 Surface cond
45、ition The surface of the fastener, before immersion in the molten zinc, shall be clean and free from all contaminants that would adversely effect the galvanizing. 4.2 Zinc The zinc used for this process shall be in accordance with ISO 1461. 5 Hot dip galvanizing procedures and precautions 5.1 Stress
46、 relief Fasteners subjected to severe work hardening may require stress relief before acid cleaning and hot dip galvanizing. 5.2 Cleaning and pickling Parts shall be cleaned. During the cleaning process, hydrogen could be absorbed into the steel. The hydrogen may not effuse completely in the galvani
47、zing bath and consequently, may lead to brittle failure. Unless otherwise agreed, parts heat treated or work hardened to a hardness of W 320 HV shall be cleaned using an inhibited acid, alkaline or mechanical process. Immersion time in the inhibited acid depends on the as-received surface condition
48、and should be of minimum duration. NOTE An inhibited acid is an acid to which a suitable inhibitor has been added to reduce corrosive attack on the steel and absorption of hydrogen. 5.3 Baking If baking is carried out, it shall be carried out prior to surface activation. 5.4 Fluxing Parts shall be s
49、urface activated, and dried if necessary. 5.5 Hot dip galvanizing Normal temperature galvanizing is carried out at a bath temperature of 455 C to 480 C. High temperature galvanizing is used to produce a smoother and thinner coating and is carried out at a bath temperature of 530 C to 560 C. The finish obtained using the high temperature process is dull. In order to avoid micro-cracks, bolts, screws and studs of property class 10.9 in sizes M27 and above, shall not be high temperature galvanized. Galvanizing shall
