BS-EN-754-7-2008.pdf

BRITISH STANDARD BS EN 754-7:2008 Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 7: Seamless tubes, tolerances on dimensions and form ICS 77.150.10 ? BS EN 754-7:2008 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 © BSI 2008 ISBN 978 0 580 55600 5 National foreword This British Standard is the UK implementation of EN 754-7:2008. It supersedes BS EN 754-7:1998 which is withdrawn.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 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 publication DateComments EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 754-7 March 2008 ICS 77.150.10Supersedes EN 754-7:1998 English Version Aluminium and aluminium alloys - Cold drawn rod/bar and tube - Part 7: Seamless tubes, tolerances on dimensions and form Aluminium et alliages d'aluminium - Barres et tubes étirés - Partie 7: Tubes filés sur aiguille, tolérances sur dimensions et forme Aluminium und Aluminiumlegierungen - Gezogene Stangen und Rohre - Teil 7: Nahtlose Rohre, Grenzabmaße und Formtoleranzen This European Standard was approved by CEN on 10 February 2008. CEN members are bound to comply with the CEN/CENELEC 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 national standards may be obtained on application to the CEN Management Centre or 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 CEN Management Centre has the same status as the official versions. CEN members are the national 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 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2008 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 754-7:2008: E EN 754-7:2008 (E) 2 Contents Page Foreword3 1 Scope 5 2 Tolerances on dimensions .6 2.1 General6 2.2 Diameter - Round tube 6 2.3 Width, depth or width across flats - squares, rectangles, hexagons, octagons.7 2.4 Wall thickness variation (eccentricity) 7 2.5 Length.8 2.6 Squareness of cut ends 9 3 Tolerances on form9 3.1 General9 3.2 Straightness.9 3.3 Convexity-Concavity .10 3.4 Twist11 3.5 Angularity.12 3.6 Corner and fillet radii.13 3.7 Depth of dents for round tube13 Annex A (informative) Wall thickness variation (eccentricity) .14 A.1 General14 A.2 Specifying round tube sizes and tolerances 14 A.2.1 General14 A.2.2 Wall thickness variation for tubes specified as OD × × × × t or ID × × × × t14 A.2.3 Wall thickness variation for tubes specified as OD × × × × ID .15 Bibliography16 BS EN 754-7:2008 EN 754-7:2008 (E) 3 Foreword This document (EN 754-7:2008) 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 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 754-7:1998. Within its programme of work, Technical committee CEN/TC 132 entrusted CEN/TC 132/WG 5 “Extruded and drawn products“ to revise EN 754-7:1998. The following technical modifications have been introduced during the revision: Clause 1: Scope is clarified with respect to what is not included Subclause 2.4 and Table 3: Requirements to wall thickness variation (eccentricity) is introduced Annex A: Informative Annex A is added explaining wall thickness variation (eccentricity) EN 754 comprises the following parts under the general title “Aluminium and aluminium alloys Cold drawn rod/bar and tube“: 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, 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 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 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 754-7:2008 EN 754-7:2008 (E) 4 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, 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 the United Kingdom. BS EN 754-7:2008 EN 754-7:2008 (E) 5 1 Scope This document specifies the tolerances on dimensions and form for aluminium and aluminium alloys cold drawn seamless tubes with an outside diameter (OD) from 3 mm to 350 mm (round tube, see Figure 1) or with a cross section contained within a circumscribing circle (CD) from 8 mm to 300 mm (other than round tube, see Figure 2) supplied in straight lengths. This standard only applies to tube produced by the seamless die/mandrel method of extrusion (and then cold drawn to the final dimensions required). The temper designations used in this part are according to EN 515. This document applies to cold drawn, seamless tube for general engineering applications. This document does not apply to: cold drawn tube produced by the porthole/bridge method (EN 754-8), tubes delivered in coils (EN 13958), coiled tubes cut to length (EN 13958). Figure 1 Round tube Figure 2 Circumscribing circle for other than round tube BS EN 754-7:2008 EN 754-7:2008 (E) 6 2 Tolerances on dimensions 2.1 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 dimensions, but not to all three. As a result, the purchaser shall only state two nominal dimensions on any given order. 2.2 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 tolerances on diameter are specified in Table 1. Table 1 Tolerances on diameter for round tube Dimensions in millimetres Tolerance on diameter Diameter (OD or ID) Maximum allowable deviation of diameter at any point from specified diameter a Over Up to and including Maximum allowable deviation of mean diameter from specified diameter e Non-annealed and non heat treated tube b Heat treated tube c Tempers O, H111 and Tx510 3 8 ± 0,04 d ± 0,08 d ± 0,12 d ± 0,25 d 8 18 ± 0,05 ± 0,09 ± 0,15 ± 0,30 18 30 ± 0,06 ± 0,10 ± 0,20 ± 0,40 30 50 ± 0,07 ± 0,12 ± 0,25 ± 0,50 50 80 ± 0,09 ± 0,15 ± 0,36 ± 0,70 80 120 ± 0,14 ± 0,20 ± 0,60 ± 1,2 120 200 ± 0,25 ± 0,40 ± 1,2 ± 2,4 200 350 ± 0,38 ± 0,60 ± 1,7 ± 3,4 a Not 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 multiplying the applicable tolerance as follows: - wall thickness over 2,0 % up to and including 2,5 % of outside diameter : 1,5 x tolerance; - wall thickness over 1,5 % up to and including 2,0 % of outside diameter : 2,0 x tolerance; - wall thickness over 1,0 % up to and including 1,5 % of outside diameter : 3,0 x tolerance; - wall thickness over 0,5 % up to and including 1,0 % of outside diameter : 4,0 x tolerance. b Applies to all alloys in H1x, H2x, H3x tempers, and to alloy EN AW-6063 in the T832 temper. c Applies to all alloys in T3, T4, T6, T66, T73, T8, T9 and Tx511 tempers. d This tolerance applies for outside diameter only, i.e. tube in this size range can only be specified as “Outside Diameter x Wall Thickness“. e Shall not apply to Tx510 or Tx511 tempers. BS EN 754-7:2008 EN 754-7:2008 (E) 7 2.3 Width, depth or width across flats - squares, rectangles, hexagons, octagons The tolerances on width, depth or width across flats are specified in Table 2. Table 2 Tolerances on width, depth or width across flats Dimensions in millimetres Width, depth or width across flats Maximum allowable deviation of width, depth or width across flats at any point from the specified value a Over Up to and including Non-annealed and non heat treated tube b Heat treated tube c Annealed tube d 8 18 ± 0,20 ± 0,30 ± 0,60 18 30 ± 0,25 ± 0,40 ± 0,80 30 50 ± 0,35 ± 0,50 ± 1,0 50 80 ± 0,50 ± 0,70 ± 1,4 80 120 ± 0,70 ± 1,0 ± 2,0 120 200 ± 1,0 ± 1,5 ± 3,0 a Not applicable to tubes having a wall thickness less than 2,5 % of the specified outside width, depth or width across flats. The tolerance for tubes with wall thickness less than 2,5 % of the specified width, depth or width across flats shall be determined by multiplying the applicable tolerance as follows: - wall thickness over 2,0 % up to and including 2,5 % of outside parameter : 1,5 x tolerance; - wall thickness over 1,5 % up to and including 2,0 % of outside parameter : 2,0 x tolerance; - wall thickness over 1,0 % up to and including 1,5 % of outside parameter : 3,0 x tolerance; - wall thickness over 0,5 % up to and including 1,0 % of outside parameter : 4,0 x tolerance. b Applies to all alloys in F, H1x, H2x, H3x tempers. c Applies to all alloys in T3, T4, T6, T66, T73, T8, T9 and Tx511 tempers. d Applies to all alloys in O, H111 and Tx510 tempers. 2.4 Wall thickness variation (eccentricity) The tolerances on wall thickness variation (eccentricity) are specified in Table 3. BS EN 754-7:2008 EN 754-7:2008 (E) 8 Table 3 Tolerances on wall thickness variation (eccentricity) Nominal wall thickness t mm Over Up to and including Tolerance on wall thickness variation for round tube (eccentricity) % a Tolerance on wall thickness variation for other than round tube % a 0,5 3 ± 10 ± 12 3 5 ± 9 ± 11 5 - ± 8 ± 10 a For OD greater than 150 mm together with and OD/t ratio of more than 10, the tolerance on wall thickness variation shall be subject to agreement between supplier and purchaser. NOTE Round tube dimensions can be expressed in three different ways i.e. outside diameter (OD) × wall thickness (t), inside diameter (ID) × t (where t is the nominal wall thickness) and OD × ID. Depending of the way of ordering the tube the values in Table 3 should be understood as follows (see Annex A for further explanation): for tubes specified as OD x t or ID x t the values are allowable variation at any point for tubes specified as OD x ID the above values are allowable variation from the calculated mean wall thickness. 2.5 Length If fixed lengths are to be supplied, this shall be stated in the order document. The tolerances on fixed length are specified in Table 4. Table 4 Tolerances on fixed length Dimensions in millimetres Outside diameter or diameter of the circumscribing circle Tolerances on fixed length Over Up to and including L 2 0002 000 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 1,2 0,80 3.4 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 tolerances are specified in Table 7 as a function of the width W and the length L of the tube. Key 1 base plate Figure 5 Measurement of twist BS EN 754-7:2008 EN 754-7:2008 (E) 12 Table 7 Twist tolerances Dimensions in millimetres Twist tolerance T Width W On total tube length L Over Up to and Including Per 1 000 mm of length a Up to and including 6 000 mm Over 6 000 mm - 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 a Twist tolerances for lengths less than 1 000 mm shall be subject to agreement between supplier and purchaser. 3.5 Angularity The deviation from square of square and rectangular tubes shall be measured as shown in Figure 6. The maximum allowable deviation from square is specified in Table 8 as a function of tube depth B. In the case of rectangular tubes, the tolerance on squareness shall apply to the shorter side of the tube. The maximum allowable 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. Figure 6 Measurement of deviation from square BS EN 754-7:2008 EN 754-7:2008 (E) 13 Table 8 Squareness tolerances for square and rectangular tubes Dimensions in millimetres Depth B Over Up to and including Maximum allowable deviation Z from right angle - 30 0,4 30 50 0,7 50 80 1,0 80 120 1,4 120 200 2,0 3.6 Corner and fillet radii Sharp corners and fillets radii may be slightly rounded unless otherwise indicated on the drawing. If corner and fillet radii are to be specified, these shall be subject to agreement between supplier and purchaser together with relevant tolerances. 3.7 Depth of dents for round tube The tolerances for depth of dents are specified in Table 9. The tolerances for other than round tube shall be subject to agreement between supplier and purchaser. Table 9 Depth of dents tolerances for round tube Dimensions in millimetres Outside or inside diameter Tolerance on depth of dent a Over Up to and including Non-annealed and non heat treated tube b Heat treated tube c Annealed tube d 3 8 0,08 0,12 0,25 8 18 0,09 0,15 0,30 18