1、BRITISH STANDARDBS EN 755-6:2008Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 6: Hexagonal bars, tolerances on dimensions and formICS 77.150.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40
2、g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 755-6:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 55561 9National forewordThis British Standard is the UK implementation o
3、f EN 755-6:2008. It supersedes BS EN 755-6:1996 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee NFE/35, Light metals and their alloys.A list of organizations represented on this committee can be obtained on request to its secretary.This publication do
4、es not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISC
5、HE NORMEN 755-6March 2008ICS 77.150.10 Supersedes EN 755-6:1995 English VersionAluminium and aluminium alloys - Extruded rod/bar, tube andprofiles - Part 6: Hexagonal bars, tolerances on dimensions andformAluminium et alliages daluminium - Barres, tubes etprofils fils - Partie 6: Barres hexagonales,
6、 tolrances surdimensions et formeAluminium und Aluminiumlegierungen - StranggepressteStangen, Rohre und Profile - Teil 6: Sechskantstangen,Grenzabmae und FormtoleranzenThis European Standard was approved by CEN on 10 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulat
7、ions which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This Europ
8、ean Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the nation
9、al standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and Unit
10、ed Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 755-6:2008: EEN
11、755-6:2008 (E) 2 Contents Page Foreword3 1 Scope 5 2 Alloy groups .5 3 Tolerances on dimensions .5 3.1 Width across flats5 3.2 Corner radii.6 3.3 Length .6 3.4 Squareness of cut ends 7 4 Tolerances on form7 4.1 Straightness .7 4.2 Convexity-Concavity .8 4.3 Twist8 Bibliography 10 BS EN 755-6:2008EN
12、755-6:2008 (E) 3 Foreword This document (EN 755-6:2008) has been prepared by Technical Committee CEN/TC 132 “Aluminium and aluminium alloys”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text
13、 or by endorsement, at the latest by September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. This document supersedes EN 755-6:1995. Within its programme of work, Technical committee CEN/TC 132 entrusted CEN/TC 132/WG 5 “Extruded and drawn products“ to
14、revise EN 755-6:1995. The following technical modifications have been introduced during the revision: Clause 2: Alloys EN AW-3102, EN AW-6008, EN AW-6010A, EN AW-6014, EN AW-6023, EN AW-6360, EN AW-6262A, EN AW-6065 and EN AW-6182 are added in Group I Clause 2: Alloys EN AW-5049, EN AW-7108, EN AW-7
15、108A and EN AW-7021 are added in Group II EN 755 comprises the following parts under the general title “Aluminium and aluminium alloys Extruded rod/bar, tube and profiles“: Part 1: Technical conditions for inspection and delivery Part 2: Mechanical properties Part 3: Round bars, tolerances on dimens
16、ions and form Part 4: Square bars, tolerances on dimensions and form Part 5: Rectangular bars, tolerances on dimensions and form Part 6: Hexagonal bars, tolerances on dimensions and form Part 7: Seamless tubes, tolerances on dimensions and form Part 8: Porthole tubes, tolerances on dimensions and fo
17、rm Part 9: Profiles, tolerances on dimensions and form Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. CEN/TC 132 affirms it is its po
18、licy that in the case when a patentee refuses to grant licenses on standardized standards products under reasonable and not discriminatory conditions then this product shall be removed from the corresponding standard. BS EN 755-6:2008EN 755-6:2008 (E) 4 According to the CEN/CENELEC Internal Regulati
19、ons, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherla
20、nds, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 755-6:2008EN 755-6:2008 (E) 5 1 Scope This document specifies the dimension and form tolerances for aluminium and aluminium alloy extruded hexagonal bars having widths across flats in
21、 the range from 10 mm up to 220 mm. The temper designations used in this part are according to EN 515. 2 Alloy groups The division into group I and group II of the most commonly used general engineering alloys is specified in Table 1. Grouping of other alloys is subject to agreement between supplier
22、 and purchaser. Table 1 Alloy groups Group I EN AW-1050A, EN AW-1070A, EN AW-1200, EN AW-1350 EN AW-3102, EN AW-3003, EN AW-3103 EN AW-5005, EN AW-5005A, EN AW-5051A, EN AW-5251 EN AW-6101A, EN AW-6101B, EN AW-6005, EN AW-6005A, EN AW-6106, EN AW-6008, EN AW-6010A, EN AW-6012, EN AW-6014, EN AW-6018
23、, EN AW-6023, EN AW-6351, EN AW-6060, EN AW-6360, EN AW-6061, EN AW-6261, EN AW-6262, EN AW-6262A, EN AW-6063, EN AW-6063A, EN AW-6463, EN AW-6065, EN AW-6081, EN AW-6082, EN AW-6182 Group II EN AW-2007, EN AW-2011, EN AW-2011A, EN AW-2014, EN AW-2014A, EN AW-2017A, EN AW-2024, EN AW-2030 EN AW-5019
24、, EN AW-5049, EN AW-5052, EN AW-5154A, EN AW-5454, EN AW-5754, EN AW-5083, EN AW-5086 EN AW-7003, EN AW-7005, EN AW-7108, EN AW-7108A, EN AW-7020, EN AW-7021, EN AW-7022, EN AW-7049A, EN AW-7075 3 Tolerances on dimensions 3.1 Width across flats The tolerances on width across flats are specified in T
25、able 2. For the purpose of this European Standard the alloys are distributed into two groups which correspond to varying difficulty when manufacturing the products. The division into group I and group II of the most commonly used general engineering alloys is specified in Table 1. BS EN 755-6:2008EN
26、 755-6:2008 (E) 6 Table 2 Tolerances on width across flats Dimensions in millimetres Width across flats S Tolerances Over Up to and including Alloy group I Alloy group II 10 18 0,22 0,30 18 25 0,25 0,35 25 40 0,30 0,40 40 50 0,35 0,45 50 65 0,40 0,50 65 80 0,50 0,70 80 100 0,55 0,90 100 120 0,65 1,0
27、 120 150 0,80 1,2 150 180 1,0 1,4 180 220 1,15 1,7 3.2 Corner radii Maximum corner radii are specified in Table 3. Table 3 Maximum comer radii Dimensions in millimetres Width across flats S Over Up to and including Maximum corner radii 10 30 1,5 30 60 2,0 60 80 2,5 80 120 3,0 120 180 4,0 180 220 5,0
28、 3.3 Length If fixed lengths are to be supplied, this shall be stated in the order document. The fixed length tolerances are specified in Table 4. BS EN 755-6:2008EN 755-6:2008 (E) 7 Table 4 Fixed length tolerances Dimensions in millimetres Width across flats S Tolerances on length Over Up to and in
29、cluding L 2 000 2 000 5 000 - 100 05+07+010+100 200 07+09+012+200 220 08+011+014+If no fixed or minimum length is specified in the order document, hexagonal extruded bars may be delivered in random lengths. The actual lengths and tolerances on random lengths shall be agreed between supplier and purc
30、haser. 3.4 Squareness of cut ends The squareness of cut ends shall be within half of the fixed-length tolerance range (Table 4) for both fixed and random lengths (e.g. for a fixed length tolerance of 10 0 +mm the squareness of cut ends shall be within 5 mm). 4 Tolerances on form 4.1 Straightness Dev
31、iations from straightness, hsand ht,shall be measured as shown in Figure 1 with the hexagonal bar placed on a horizontal base plate so that its mass decreases the deviation. Straightness tolerances are specified in Table 5 (The straightness tolerance htapplies to the whole length, e.g. for a length
32、of 6 m the maximum deviation from straightness htis the value given in the table multiplied by 6 m). The straightness tolerances apply to hexagonal bars in all tempers except O and Tx510. If a straightness tolerance is required for either O or Tx510 temper, it shall be agreed between supplier and pu
33、rchaser. BS EN 755-6:2008EN 755-6:2008 (E) 8 Key 1 base plate 2 straight edge Figure 1 Measurement of deviation from straightness Table 5 Straightness tolerances Dimensions in millimetres Width across flats S Over Up to and including Maximum deviation from straightness per metre length ht/length mm/
34、m Maximum localised kink in any 300 mm portion hs 10 80 2 0,8 80 120 2 1,0 120 220 3 1,5 4.2 Convexity-Concavity The convexity-concavity tolerances for hexagonal bar shall be included within the width-across-flats tolerances as given in Table 2. 4.3 Twist The twist measurement shall be carried out a
35、s shown in Figure 2. The twist tolerances are specified in Table 6. The twist tolerances apply to hexagonal bars in all tempers except O and Tx510. If a twist tolerance is required for either O or Tx510 temper, it shall be agreed between supplier and purchaser. BS EN 755-6:2008EN 755-6:2008 (E) 9 Ke
36、y 1 base plate Figure 2 Measurement of twist Table 6 Twist tolerances Dimensions in millimetres Width across flats S Twist tolerances T Over Up to and including Per 1 000 mm of length Over the total length 10 30 1 1,5 30 80 1,5 2,5 80 120 2 3 120 220 2,5 4 BS EN 755-6:2008EN 755-6:2008 (E) 10 Biblio
37、graphy 1 EN 515, Aluminium and aluminium alloys Wrought products Temper designations BS EN 755-6:2008blankBS EN 755-6:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on
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