1、BS EN 755-8:2016Aluminium and aluminium alloys Extruded rod/bar, tube and profilesPart 8: Porthole tubes, tolerances on dimensions and formBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 755-8:2016 BRITISH STANDARDNational forewordThis British Standard is the U
2、K implementation of EN 755-8:2016. It supersedes BS EN 755-8:2008 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee NFE/35, Light metals and their alloys.A list of organizations represented on this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.Th
3、is publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016ISBN 978 0 580 91004 3 ICS 77.150.10 Compliance with a British Standard cannot conf
4、er immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2016.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 755-8:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 755-8 June 201
5、6 ICS 77.150.10 Supersedes EN 755-8:2008English Version Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 8: Porthole tubes, tolerances on dimensions and form Aluminium et alliages daluminium - Barres, tubes et profils fils - Partie 8 : Tubes fils pont, tolrances sur dimens
6、ions et forme Aluminium und Aluminiumlegierungen - Stranggepresste Stangen, Rohre und Profile - Teil 8: Mit Kammerwerkzeug stranggepresste Rohre, Grenzabmae und Formtoleranzen This European Standard was approved by CEN on 11 April 2016. CEN members are bound to comply with the CEN/CENELEC Internal R
7、egulations 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 national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN m
8、ember. 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 CEN-CENELEC Management Centre has the same status as the official versions
9、. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pola
10、nd, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation i
11、n any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 755-8:2016 EBS EN 755-8:2016EN 755-8:2016 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 5 3 Tolerances on dimensions . 5 3.1 General 5 3.2 Diameter - Round tube 5 3.3 Width, depth or wid
12、th across flats - squares, rectangles, hexagons, octagons . 6 3.4 Wall thickness variation (eccentricity) . 7 3.5 Length 8 3.6 Squareness of cut ends 9 4 Tolerances on form 9 4.1 General 9 4.2 Straightness . 9 4.3 Convexity-Concavity 10 4.4 Twist . 11 4.5 Angularity . 12 4.6 Corner and fillet radii
13、. 13 4.7 Depth of dents for round tube . 14 Annex A (informative) Wall thickness variation (eccentricity) . 15 A.1 General . 15 A.2 Specifying round tube sizes and tolerances . 15 A.2.1 General . 15 A.2.2 Wall thickness variation for tubes specified as OD t or ID t . 15 A.2.3 Wall thickness variatio
14、n for tubes specified as OD ID . 16 Bibliography . 17 BS EN 755-8:2016EN 755-8:2016 (E) 3 European foreword This document (EN 755-8:2016) 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 g
15、iven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2016, and conflicting national standards shall be withdrawn at the latest by December 2016. Attention is drawn to the possibility that some of the elements of this document
16、 may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 755-8:2008. The following technical modifications have been introduced during the revision: Figure 1; Subclause 3.2 Diameter - Round tube.
17、 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 dimensions and form; Part 4: Square bars, toler
18、ances 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 form; Part 9: Profiles, tolerances on
19、dimensions and form. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of M
20、acedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 755-8:2016EN 755-8:2016 (E) 4 1 Scope This European Standard
21、 specifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded porthole tubes with an outside diameter (OD) from 8 mm to 450 mm (round tube, see Figure 1) or with a cross section contained within a circumscribing circle (CD) from 10 mm to 350 mm (other than round tube, s
22、ee Figure 2), supplied in straight lengths. This European Standard only applies to extruded porthole tube for general engineering applications made in the following alloys: EN AW-1050A, EN AW-1200, EN AW-1350; EN AW-3003, EN AW-3103; EN AW-5005, EN AW-5005A, EN AW-5049, EN AW-5051A, EN AW-5251, EN A
23、W-5052; EN AW-6101A, EN AW-6101B, EN AW-6005, EN AW-6005A, EN AW-6008, EN AW-6110A, EN AW-6012, EN AW-6014, EN AW-6018, 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; EN AW-7003
24、, EN AW-7005, EN AW-7108, EN AW-7108A, EN AW-7020. The temper designations used in this part are according to EN 515. This European Standard only applies to tube produced by the tube porthole/bridge method. This European Standard does not apply to: extruded tubes produced by the seamless, die/mandre
25、l method (EN 755-7), tubes delivered in coils (EN 13957), coiled tubes cut to length (EN 13957). Figure 1 Round tube BS EN 755-8:2016EN 755-8:2016 (E) 5 Figure 2 Circumscribing circle for other than round tube 2 Normative references The following documents, in whole or in part, are normatively refer
26、enced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 755-1:2016, Aluminium and aluminium alloys Extruded rod/bar, tube and p
27、rofiles Part 1: Technical conditions for inspection and delivery 3 Tolerances on dimensions 3.1 General When outside diameter OD, inside diameter ID, and wall thickness t (or their equivalent dimensions in other than round tube) are all specified, standard tolerances shall apply to any two of these
28、dimensions, but not to all three. As a result, the purchaser shall only state two nominal dimensions on any given order. 3.2 Diameter - Round tube Mean diameter is defined as the average of two diameter measurements taken at right angles to each other at any position along the length. The maximum al
29、lowable deviation of diameter at any point from the specified diameter is the maximum difference measured at any point along the length of the tube ie it is inclusive of any ovality in the cross section. The tolerances on diameter are specified in Table 1. As detailed in EN 755-1:2016, Clause 4, if
30、the original order does not make clear the nature of the diameter tolerances required, the supplier shall interpret them as inclusive of any ovality (i.e. maximum allowable deviation at any point from the specified diameter in Table 1). However, the diameter tolerances may be expressed as both mean
31、and inclusive of ovality if this is specifically requested by the purchaser. BS EN 755-8:2016EN 755-8:2016 (E) 6 Table 1 Tolerances on diameter for round tube Dimensions in millimetres Diameter (OD or ID) Tolerance on diameter Maximum allowable deviation of mean diameter from specified diameter fMax
32、imum allowable deviation of diameter at any point from specified diameter aOver Up to and including Non-annealed and non heat treated tube bHeat treated tube cAnnealed tube d 8 18 0,25 e 0,40 e 0,60 e 1,5 e 18 30 0,30 0,50 0,70 1,8 30 50 0,35 0,60 0,90 2,2 50 80 0,40 0,70 1,1 2,6 80 120 0,60 0,90 1,
33、4 3,6 120 200 0,90 1,4 2,0 5,0 200 350 1,4 1,9 3,0 7,6 350 450 1,9 2,8 4,0 10,0 aNot applicable to tubes having a wall thickness less than 2,5 % of the specified outside diameter. The tolerance for tubes with wall thickness less than 2,5 % of the specified outside diameter shall be determined by mul
34、tiplying the applicable tolerance as follows: wall thickness over 2,0 % up to and including 2,5 % of outside diameter: 1,5 tolerance; wall thickness over 1,5 % up to and including 2,0 % of outside diameter: 2,0 tolerance; wall thickness over 1,0 % up to and including 1,5 % of outside diameter: 3,0 t
35、olerance; wall thickness over 0,5 % up to and including 1,0 % of outside diameter: 4,0 tolerance. bApplies to all alloys in F or H112 tempers. cApplies to all alloys in T4, T5, T6, T64, T66 and Tx511 tempers. dApplies to all alloys in O, H111 and Tx510 tempers. eThis tolerance applies for outside di
36、ameter only, i.e. tube in this size range can only be specified as “Outside Diameter x Wall Thickness”. fNot applicable to Tx510 or Tx511 tempers. 3.3 Width, depth or width across flats - squares, rectangles, hexagons, octagons The tolerances on width, depth or width across flats are specified in Ta
37、ble 2. BS EN 755-8:2016EN 755-8:2016 (E) 7 Table 2 Tolerances on width, depth or width across flats Dimensions in millimetres Width, depth or width across flats Tolerances on width, depth or width across flats a, bCD 100 100 5 - 30 0,30 0,20 30 60 0,40 0,30 60 100 0,60 0,40 100 150 0,90 0,60 150 200
38、 1,2 0,80 200 350 1,8 1,2 4.4 Twist Twist T shall be measured as shown in Figure 5 by placing the tube on a flat base plate, the tube resting under its own mass and measuring the maximum distance at any point along the length between the bottom surface of the tube and the base plate surface. Twist t
39、olerances are specified in Table 8 as a function of the width W and the length L of the tube. BS EN 755-8:2016EN 755-8:2016 (E) 12 Key 1 base plate Figure 5 Measurement of twist Table 8 Twist tolerances Dimensions in millimetres Width W Twist tolerance T per 1 000 mm of length aOn total tube length
40、L Over Up to and including up to and including 6 000 over 6 000 10 30 1,2 2,5 3,0 30 50 1,5 3,0 4,0 50 100 2,0 3,5 5,0 100 200 2,5 5,0 7,0 200 350 2,5 6,0 8,0 aTwist tolerances for lengths less than 1 000 mm shall be subject to agreement between supplier and purchaser. 4.5 Angularity The deviation f
41、rom square of square and rectangular tubes shall be measured as shown in Figure 6. The maximum allowable deviation from square is specified in Table 9 as a function of tube depth B. In case of rectangular tubes, the tolerance on squareness shall apply to the shorter side of the tube. The maximum all
42、owable deviation in an angle other than a right angle (hexagonal tubes, octagonal tubes) shall be included within the width across flats tolerances, see Table 2. BS EN 755-8:2016EN 755-8:2016 (E) 13 Figure 6 Measurement of deviation from square Table 9 Squareness tolerances for square and rectangula
43、r tubes Dimensions in millimetres Depth B Maximum allowable deviation Z from square Over Up to and including - 30 0,4 30 50 0,7 50 80 1,0 80 120 1,4 120 180 2,0 180 240 2,6 240 350 3,1 4.6 Corner and fillet radii Sharp corners and fillet radii may be slightly rounded unless otherwise indicated on th
44、e drawing. The maximum allowable radii are specified in Table 10. When a corner or fillet radius is specified the maximum allowable deviation from the specified radius is given in Table 11. Table 10 Maximum allowable corner and fillet radii Dimensions in millimetres Wall thickness Maximum allowable
45、corner and fillet radii 5 0,8 5 1,5 BS EN 755-8:2016EN 755-8:2016 (E) 14 Table 11 Maximum allowable deviation from specified corner and fillet radii Specified radius mm Maximum allowable deviation from nominal value of the radius 5 0,5 mm 5 10 % 4.7 Depth of dents for round tube It is recognized in
46、certain applications that the depth of surface dents can be an important factor particularly for round tube with large diameter to wall thickness ratios. In such cases the maximum allowable depth of dents shall be subject to agreement between supplier and purchaser. BS EN 755-8:2016EN 755-8:2016 (E)
47、 15 Annex A (informative) Wall thickness variation (eccentricity) A.1 General Wall thickness variation tolerances for round tube can be the source of a lot of confusion. In particular as to whether quoted values are based on the nominal or mean wall thickness. This present section is included in the
48、 standard to provide some guidelines as to when each of these possibilities is more appropriate. A.2 Specifying round tube sizes and tolerances A.2.1 General It is evident that round tube dimensions can be expressed in three different ways i.e. outside diameter (OD) wall thickness (t), inside diamet
49、er (ID) t (where t is the nominal wall thickness) and OD ID. Since all three dimensions interact in any given size tube, it is only possible to apply tolerances to any two of the parameters depending on which are the most important for the application of the tube in question. The choice of the dimensional parameters has a very significant effect on how the wall thickness variation is expressed. The method of measuring wall thickness t is
