1、 STD-BSI BS EN IS0 15330-ENGL 1777 E 1b2gbb9 08081bb 325 BRITISH STANDARD Fasteners - Preloading test for the detection of hydrogen embrittlement - Parallel bearing surface method The European Stanard EN IS0 153301999 has the status of a British Standard ICs 21.060.01 NO COPYING WITHOUT BSI PERMISSI
2、ON EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 15330: 1999 STD-6SI BS EN IS0 15330-ENGL 3999 Lb211bb9 Q8081b7 2b3i direction of the Engineering Amd. No. Date Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 1999 Q BSI 11-1999 Nati
3、onal foreword Comments This British Standard is the English language versi identical with IS0 153301999. n f EN IS0 1533Q1999. It is The UK participation in its preparation was entrusted by Technical Committee FMEI, Bolts, nuts and accessories, to Subcommittee FME/!3/1, Mechanical properties of fast
4、eners, which has the responsibility to: - aid enquirers to understand the text, - present to the responsible intematio - monitor related internationai and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its s
5、ecretary, Cross-references Attention is dram to the fact that CEN and CENELEC Standards normally include an annex which lists nonnative references to intedonal publications with their corresponding European publications. The British Standards which implement international or European publications re
6、ferred to in this document may be found in the BSI Standards Catalogue under the section entitled “Intedonal Standards Correspondence index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a co
7、ntract Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN Is0 title page, the EN Is0 foreword pag
8、e, the Is0 title page, pages ii to iv, pages 1 to 9, the annex ZA page, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. ISBN O 580 36013 4 STD=BSI BS EN IS0 35330-ENGL 1999 Lb2ilbb9 OBOBlbB 1TB Ip EUROPEAN STANDA
9、RD NORME EUROPENNE EUROPISCHE NORM EN IS0 15330 September 1999 ICs 21.060.10 English version Fasteners - Preloading test for the detection of hydrogen embrittlement - Parallel bearing surface method (IS0 1 5330: 1 999) Elements de fixation - Essai de prcharge pour la dbtection de la fragilisation pa
10、r lhydrogne - Methode des plaques parallles (IS0 15330:1999) Verbindungselemente - Verspannungsversuch zur Entdeckung von WasserstoffversprMung - Verfahren mit paralleien Auflageflchen (IS0 15330:1999) This European Standard was approved by CEN on 21 July 1999. CEN members are bound to comply with t
11、he CEWCENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such natiOwl standards may be obtained on application to the Central Secretariat or
12、 to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the Official versi
13、ons. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France. Germany, Greece, Iceland. Ireland. Italy, Luxembourg, Netherlands. Norway. Portugal, Spain, Sweden, Swlzedand and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN D
14、E NORMALISATION EUROPAISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Starsert, 36 B-1050 Brussels (6 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IC0 15!330:1999 E Foreword The text of the Intemational Standard IS0 1
15、5330:1999 has been prepared by Technical Committee ISO/TC 2 “Fasteners in collaboration 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 standa
16、rd, either by publication of an identical tpxt or by endorsement, at the latest by March 2000, and conflicting national standards shall be withdrawn at the 1 latest by March 2000. I According to the CENCENELEC Intemal-Regulatienc,-ihe-RationaCstanasrganiations of .the following Switzerland and the U
17、nited Kingdom. l countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Endorsement notice I l The text of the International Standard IS0 15330:1999 was app
18、roved by CEN as a European Standard without any modification. NOTE: Normative references to Intemational Standards are listed in annex ZA (normative). STD=BSI BS EN IS0 L5330-ENGL 2777 Lb2Ybb9 0808270 85b EN IS0 16330:1999 INTERNATIONAL STANDARD IS0 15330 First edition 1999-09-01 Fasteners - Preload
19、ing test for the detection of hydrogen embrittlement - Parallel bearing surface method lments de fixation - Essai de prcharge pour la dtection de la fragi/isation par ihydrogne - Mthode des plaques parallles Reference number IC0 15330:19991E) - STD-BSI BS EN IS0 L5330-ENGL 11999 W lbZribb9 08061173
20、792 * 4 Principle . EN IS0 15330:1999 2 Contents page ii STDoBSI BS EN IS0 15330-ENGL 1999 = 1b24bb9 0808372 b29 EN IS0 16330:1999 Foreword IS0 (the Intemational Organization for Standardization) is a worldwide federation of national standards Wies (IS0 member bodies). The work of preparing Internat
21、ional Standards is normally carried out through IS0 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. Intemational organizations, governmental and non-governmental, in liaison with EO
22、, also take pari in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are draited in accordance with the rules given in the ISOAEC Directives, Pari 3. Draft International Standards a
23、dopted 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. International Standard IS0 15330 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee S
24、C 1 , Mechanical properties of fasteners. iii STD-BSI BS EN IS0 15330-ENGL 1999 lb2qbb9 0808173 5b5 iC EN IS0 15330:1999 Introduction When atomic hydrogen enters steels, it can cause loss of ductility or loadcarrying ability, cracking (usually as submicroscopic cracks) or catastrophic brittle failur
25、es at applied stresses well below the yield strength or evep the normal design strength for the alloys. This phenomenon often occurs in alloys that show no significant ductility when measured by conventional tensile tests, and is frequently referred to as hydrogen-induced britle failure, hydrogen st
26、ress cracking or hydrogen embrittlement. The hydrogen can be introduced treatment, gas carburizing, cleaning, pickling, phosphating, electroplating and in the service of cathodic protection or corrosion reactions. Hydrogen can also be introduced during during roll forming, machining, and drilling du
27、e to coolant or lubricant break-down as brazing operations. iv Fasteners - Preloading test for the detection of hydrogen embrittlement - Parallel bearing surface method 1 scope This Intemational Standard specifies a preloading test which is able to detect the occurence of hydrogen embritlement of fa
28、steners at room temperature. This test is applicable to - metric bolts, screws and studs; - thread rolling screws; - seif-tapping screws: - self-drilling screws; - nuts; - washers which are made of steel and are under tensile stress. The test shall be carried out within a temperature range of 10 “C
29、to 35 “C. The test is suitable only for in-process control and may be carried out after any step of the manufacturing process. It is not intended as an acceptance test. It is capable of assessing differences or changes in processing conditions or techniques and to determine the effectiveness of the
30、various processing steps including pre- and post-coating treatments (baking) to reduce the mobile hydrogen in the fasteners. This test does not relieve the manufacturer or processor from the responsibility of imposing and monitoring suitable process control. NOTE The chance of detecting hydrogen emb
31、ritlement decreases significantly if the test is started more than 24 h aiter the last step of manufacturing process. Therefore, in normal cases this test is not suitable for acceptance testing. Special attention shall be given to the reference test in clause 7.3. 2 Normative references The followin
32、g normative documents contain provisions which, through reference in this text, constitute provisions of this Intemational Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Sta
33、ndard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of currently valid International St
34、andards. IS0 273:1979, Fasteners - Clearance holes for bolts and screws. IS0 2702: 1992, Heat-treated steel tapping screws - Mechanical properties. 1 IS0 70831 999, Mechanical and performance requirements of case hardened and tempered metric thread rolling screws. IS0 10666:1999, Drilling screws wit
35、h tapping screw thread - Mechanical and functional properties. 3 Terms and definitions For the purposes of this international Standard the following terms and definitions apply. 3.1 susceptibility to hydrogen embrittlement characteristic of a steel fastener to display brittle failure due to the pres
36、ence of mobile hydrogen and subjected to a significant degree of tensile stress and/or adverse service conditions NOTE 1 brittle failure decreases markedly. NOTE 2 unsusceptible condition, even by any post-coating heat treatment (baking). With increasing susceptibility to hydrogen embrittlement, the
37、 critical amount of mobile hydrogen which may After the manufacturing process, susceptibility to hydrogen embnttlement cannot be reduced or changed ii 3.2 risk of hydrogen embrittlement risk of failure which arises if fasteners made from steel which are susceptible to hydrogen embrittlement al hydro
38、gen and are subjected to tensile stress and/or residual tensile stress when :ause to an sorb NOTE The risk of hydrogen embrittlement can be reduced when in the relevant process steps hydrogen supply is minimized andor when suitable post-coating heat treatment is carried out to enable hydrogen to eff
39、use andior to trap hydngen irreversibly in the steel. 3.3 manufacturing lot quantity of fasteners of a single designation including product grade, property class and size, manufactured from bar, wire, rod or flat product from a single cast, processed through the same or similar steps at the same tim
40、e or over a continuous time period through the same heat treatment and/or coating process, if any Same heat treatment or coating process means: - for a continuous process, the same treatment cycle without any setting modification; - for a discontinuous process, the same treatment cycle for identical
41、 consecutive loads (batches). NOTE reassembled into the same manufacturing lot. The manufacturing lot may be split into a number of manufacturing batches for processing purposes and then 3.4 manufachiring batch quantity of identical fasteners from the same manufacturing lot processed together at one
42、 time 4 Principle The preloading test is carried out in suitable test devices. The fasteners are subjected to stress in the range of the yield point or the breaking toque either by torquing with a mating nut (or bolt) or by driving in a pretapped plate, see Figures 1 to 3. Other loading systems and
43、fixtures are permissible, provided that the required stress in the range of the yield point or breaking toque of the relevant fastener can be achieved. The stress or toque is held at lea$t for 48 h. After every 24 h the fasteners are retightened to the initial stress or torque and at the same time c
44、heckd if failure due to hydrogen embrittlement has occurred. 2 5 Test apparatus According to the different types of fasteners different test devices shall be used. 5.1 Metric bob, screws and studs For metric bolts, screws and studs fixtures of hardened plates of steel with parallel faces and with on
45、e hole or with multiple holes perpendicular to the surfaces of the plates shall be used, see Figure 1. 1 2 3 Key 1 Upper plate 2 3 Lower plate 4 Nut serving as head Filler plate (for long bolts, screws or studs) a Clearance hole according to IS0 273, fine series Figure 1 - Test devices for metric bo
46、lts, scmws and studs The apparatus for metric bolts, screws and studs comprises a top and a bottom steel plate, see Figure 1. The hardness of top plate and bottom plate shall be 45 HRC minimum. The bearing surfaces shall be ground, and the roughness shall not exceed Ru = 8 pm. The thickness of each
47、plate shall be Id minimum (d is the nominal thread diameter). The clearance holes shall have diameters dh in accordance with IS0 273, fine series, and shall not be chamfered. The distance of the clearance holes, L, from each other shall be three diameters (3d) minimum. When carrying out the test, a
48、free threaded length of at least Id shall be subjected to stress, and no more than 5 full threads shall extend beyond the nut. To meet these requirements, one or more plates of steel with parallel and ground faces may be used as filler plate). The filler plate) may be manufactured from other steel g
49、rades and with a different hardness compared to upper and bottom plate. 3 EN IS0 16330:1999 The bolts, screws and studs to be tested are preloaded by tensioning with a mating nut. In the case of studs or threaded rod, nuts shall be used at both sides of the test plate(s). When they are threaded with different ,pitch threads, the nut on the fine thread shall be considered as the head. The nut representing the head shall be screwed to finger tightness up to the relevant thread end. In the case of a short screw (1 2,5 d) only one plate with pret
