1、BRITISH STANDARDBS EN 755-4:2008Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 4: Square bars, tolerances on dimensions and formICS 77.150.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53
2、g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 755-4:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 55558 9National forewordThis British Standard is the UK implementation of E
3、N 755-4:2008. It supersedes BS EN 755-4:1996 which is withdrawn.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 does
4、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 EUROPENNEEUROPISCHE
5、NORMEN 755-4March 2008ICS 77.150.10 Supersedes EN 755-4:1995 English VersionAluminium and aluminium alloys - Extruded rod/bar, tube andprofiles - Part 4: Square bars, tolerances on dimensions andformAluminium et alliages daluminium - Barres, tubes etprofils fils - Partie 4: Barres carres, tolrances
6、surdimensions et formeAluminium und Aluminiumlegierungen - StranggepressteStangen, Rohre und Profile - Teil 4: Vierkantstangen,Grenzabmae und FormtoleranzenThis European Standard was approved by CEN on 10 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which s
7、tipulate 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 European Standard
8、 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 national standards
9、 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 United Kingdom.E
10、UROPEAN 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 755-4:2008: EEN 755-4:2008 (
11、E) 2 Contents Page Foreword3 1 Scope 5 2 Alloy groups .5 3 Tolerances on dimensions .5 3.1 Width across flats 5 3.2 Corner radii.6 3.3 Length .6 3.4 Squareness of cut ends 7 4 Tolerances on forms .7 4.1 Straightness .7 4.2 Convexity - Concavity .8 4.3 Twist8 4.4 Squareness.9 Bibliography 11 BS EN 75
12、5-4:2008EN 755-4:2008 (E) 3 Foreword This document (EN 755-4:2008) 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 ide
13、ntical text 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 755-4:1995. Within its programme of work, Technical committee CEN/TC 132 entrusted CEN/TC 132/WG 5 “Extruded and drawn pr
14、oducts“ to revise EN 755-4:1995. 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-71
15、08, EN AW-7108A 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, tolerance
16、s on dimensions 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 dimens
17、ions and form 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 i
18、t is its policy 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 755-4:2008EN 755-4:2008 (E) 4 According to the CEN/CENELEC Intern
19、al Regulations, 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, Malt
20、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 755-4:2008EN 755-4:2008 (E) 5 1 Scope This document specifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded square bars having widths acr
21、oss flats 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 Ta
25、ble 2. For the purpose of this 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 755-4:2008EN 755-4:200
26、8 (E) 6 Table 2 Width across flats tolerances 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 0,45 0,70 80 100 0,55 0,90 100 120 0,65 1,0 120 150 0,80
27、 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 corner radii Dimensions in millimetres Width across flats S Maximum corner radii Over Up to and including Alloy group I Alloy group II 10 25 1,0 1,5 25 50 1,5 2,0 50 80 2,0 3,0 80 12
28、0 2,5 3,0 120 180 2,5 4,0 180 220 3,5 5,0 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 755-4:2008EN 755-4:2008 (E) 7 Table 4 Fixed length tolerances Dimensions in millimetres Width across flats
29、 S Tolerances on length Over Up to and including L 2000 2000 5000 10 100 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, square extruded bars may be delivered in random lengths. The actual lengths and tolerances on random lengths shall
30、 be agreed between supplier and purchaser. 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 To
31、lerances on forms 4.1 Straightness Deviations from straightness, hsand ht,shall be measured as shown in Figure 1 with the square bar placed on a horizontal base plate so that its mass decreases the deviation. The straightness tolerances are specified in Table 5 (The straightness tolerance htapplies
32、to the whole length, e.g. for a length of 6 m the maximum deviation from straightness htis the value given in the table multiplied by 6 m). The straightness tolerances apply to square bars in all tempers except O and Tx510. lf a straightness tolerance is required for either O or Tx510 temper, it sha
33、ll be agreed between supplier and purchaser. BS EN 755-4:2008EN 755-4:2008 (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 straigh
34、tness per metre length ht/length mm/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 for square bars shall be included within the width across flats tolerances as given in Table 2. 4.3 Twist The twist measure
35、ment shall be carried out as shown in Figure 2. The twist tolerances are specified in Table 6. The twist tolerances apply to square 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 755-4:20
36、08EN 755-4:2008 (E) 9 Key 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 3 30 50 1,5 4 50 120 2 5 120 220 3 6 4.4 Squareness The deviat
37、ion from square shall be measured as shown in Figure 3. Squareness tolerances are specified in Table 7. BS EN 755-4:2008EN 755-4:2008 (E) 10 Figure 3 Measurement of deviation from square Table 7 Squareness tolerances Dimensions in millimetres Width across flats S Over Up to and including Maximum dev
38、iation from square Z 10 100 0,01 x width 100 180 1,0 180 220 1,5 BS EN 755-4:2008EN 755-4:2008 (E) 11 Bibliography 1 EN 515, Aluminium and aluminium alloys Wrought products Temper designations BS EN 755-4:2008BS EN 755-4:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI i
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