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1、BRITISH STANDARDAluminium and aluminium alloys Cold drawn rod/bar and tube Part 8: Porthole tubes, tolerances on dimensions and formThe European Standard EN 754-8:1998 has the status of aBritish StandardICS 23.040.15; 77.150.10| BS EN754-8:1998|NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED B
2、Y COPYRIGHT LAWBS EN 754-8:1998National forewordThis British Standard is the English language version of EN 754-8:1998. This part of BS EN 754 is published together with:BS EN 754-7, Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 7: Seamless tubes, tolerances on dimensions and form.
3、BS EN 755-7, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 7: Seamless tubes, tolerances on dimensions and form.BS EN 755-8, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 8: Porthole tubes, tolerances on dimensions and form.As a result of the publi
4、cation of the above standards, BS 1471:1972 is withdrawn. The followingBritish Standards listed in the table are also partially superseded.NOTE The table gives the full list of published European Standards which partially supersede theBritish Standards.British Standards partially superseded by this
5、standard and other European StandardsBS 1474:1987BS 4300-4:1973BS 4300-12:1969BS 4300-15:1973EN 515EN 573-3EN 573-4EN 755-1EN 755-2EN 755-3EN 755-4EN 755-5EN 755-6EN 755-7EN 755-8EN 515EN 573-3EN 573-4EN 755-1EN 755-2EN 755-3EN 755-4EN 755-5EN 755-6EN 515EN 573-3EN 573-4EN 755-1EN 755-2EN 755-3EN 75
6、5-4EN 755-5EN 755-6EN 755-7EN 755-8EN 515EN 573-3EN 573-4EN 755-1EN 755-2EN 755-3EN 755-4EN 755-5EN 755-6EN 755-7EN 755-8This British Standard, having been prepared under the direction of the EngineeringSector Committee, was published under the authority of the Standards Committee and comes into eff
7、ect on 15 December 1998BSI 1998ISBN 0 580 30341 1In addition, the British Standards in the table will be withdrawn when the following EuropeanStandards are published:EN 755-9, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 9: Profiles, tolerances on dimensions and form.EN 12
8、020-1, Aluminium and aluminium alloys Extruded precision profiles in alloysEN AW 6060/EN AW 6063 Part 1: Technical conditions for inspection and delivery.EN 12020-2, Aluminium and aluminium alloys Extruded precision profiles in alloys EN AW6060/EN AW 6063 Part 2: Tolerances on dimensions and form.Th
9、e UK participation in its preparation was entrusted by Technical Committee NFE/35, Light metals and their alloys, to Subcommittee NFE/35/5, Wrought aluminium and aluminium alloys, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any
10、 enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesTh
11、e British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue.A Briti
12、sh Standard does not purport to include all the necessary provisions of a contract. Users ofBritish Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cov
13、er, an inside front cover, the EN title page, pages 2 to 9 and a back cover.Amd. No.DateText affectedAmendments issued since publicationEUROPEAN STANDARDEN 754-8NORME EUROPE ENNEEUROPA ISCHE NORMJuly 1998ICS 77.150.10Descriptors: aluminium, aluminium alloys, drawn products, aluminium tubes, toleranc
14、es on dimension, tolerances on formEnglish versionAluminium and aluminium alloys Cold drawn rod/bar and tube Part 8: Porthole tubes, tolerances on dimensions and formAluminium et alliages daluminium Barres et tubes e tire s Partie 8: Tubes file s a pont, tole rances surdimensions et formeAluminium u
15、nd Aluminiumlegierungen Gezogene Stangen und Rohre Teil 8: Mit Kammerwerkzeug stanggeprete Rohre, Grenzabmae und FormtoleranzenThis European Standard was approved by CEN on 1 July 1998.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving
16、 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 Central Secretariat or to any CEN member.This European Standard exists in three official versions
17、 (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 versions.CEN members are the national standards bodies of Austria, Belgium, Czech
18、 Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.CENEuropean Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r NormungCentral Secretariat: r
19、ue de Stassart 36, B-1050 Brussels1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationalMembers.Ref. No. EN 754-8:1998 EPage 9EN 754-8:1998BSI 1998ForewordThis European Standard has been prepared byTechnical Committee CEN/TC 132, Aluminium andContentsPag
20、ealuminium 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 January 1999, and conflicting national standards shall be withdrawn at the latest by Ja
21、nuary 1999.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
22、Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Within its programme of work, Technical CommitteeCEN/TC 132 entrusted CEN/TC 132/WG 5, Extrudedand drawn products, to prepare the following standard:EN 754-8, Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 8: Portho
23、le tubes, tolerances on dimensions and form.This standard is part of a series of eight standards. The other standards deal with:EN 754-1, Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 1: Technical conditions for inspection and delivery.EN 754-2, Aluminium and aluminium alloys Cold
24、drawn rod/bar and tube Part 2: Mechanical properties.EN 754-3, Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 3: Round bars, tolerances on dimensions and form.EN 754-4, Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 4: Square bars, tolerances on dimensions and form.
25、EN 754-5, Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 5: Rectangular bars, tolerances on dimensions and form.EN 754-6, Aluminium and aluminium alloys Cold drawn rod/bar and tube Part 6: Hexagonal bars, tolerances on dimensions and form.EN 754-7, Aluminium and aluminium alloys Col
26、d drawn rod/bar and tube Part 7: Seamless tubes, tolerances on dimensions and form.Foreword 21Scope 32Tolerances on dimensions 32.1General 32.2Diameter round tube 32.3Width, depth or width across flats squares, rectangles, hexagons,octagons 32.4Wall thickness 52.5Length 52.6Squareness of cut ends 53
27、Tolerances on form 63.1General 63.2Straightness 63.3Convexityconcavity 73.4Twist 83.5Angularity 83.6Corner and fillet radii 93.7Depth of dents for round tubes 91 ScopeThis part of EN 754 specifies the tolerances on dimensions and form for aluminium and aluminium alloy cold drawn porthole tubes with
28、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 applies only to tube produced by the porthole/bridge met
29、hod of extrusion (and then cold drawn to the final dimensions required).This standard applies only to cold drawn 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-5051A, EN AW-5251, EN AW-
30、5052;EN AW-6101A, EN AW-6101B, EN AW-6005, EN AW-6005A, EN AW-6012, EN AW-6018;EN AW-6351, EN AW-6060, EN AW-6061, EN AW-6261, EN AW-6262;EN AW-6063, EN AW-6063A, EN AW-6463, EN AW-6081, EN AW-6082;EN AW-7003, EN AW-7005, EN AW-7020.This standard does not apply to extruded cold drawn tube produced b
31、y the die/mandrel method or coiled tubes.Figure 2 Circumscribing circle for other than round tube2 Tolerances on dimensions2.1 GeneralWhen outside diameter OD, inside diameter ID, and wall thickness t, (or their equivalent dimensions in other than round tube) are all specified, standard tolerances s
32、hall apply to any two of these dimensions, but not to all three. As a result, the purchaser shall state only two nominal dimensions on any given order.2.2 Diameter round tubeMean diameter is defined as the average of two diameter measurements taken at right angles to each other at any point along th
33、e length.The tolerances on diameter are specified in Table 1.2.3 Width, depth or width across flats squares, rectangles, hexagons, octagonsThe tolerances on width, depth or width across flats are specified in Table 2.Figure 1 Round tubeTable 1 Tolerances on diameter for round tubeDimensions in milli
34、metresDiameter (OD or ID)Tolerance on diameterMaximum allowable deviation of mean diameter from specified diameter6)Maximum allowable deviation of diameter at any point from specified diameter1)OverUp to and includingNon-annealed and non heat treated tube2)Heat treated tube3)Annealed tube4)$ 380,045
35、)0,085)0,125)0,255)8180,050,090,150,3018300,060,100,200,4030500,070,120,250,5050800,090,150,360,70801200,140,200,601,21202000,250,401,22,42003500,380,601,73,41) Not applicable to tubes having a wall thickness less than 2,5 % of the specified outside diameter. The tolerance for tubes with wall thickn
36、ess 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 3 tolerance; wall thickness over 1,5 % up to and including 2,0 % of outside diameter: 2,0 3 toler
37、ance; wall thickness over 1,0 % up to and including 1,5 % of outside diameter: 3,0 3 tolerance; wall thickness over 0,5 % up to and including 1,0 % of outside diameter: 4,0 3 tolerance.2) Applies to all alloys in F, H1x, H2x, H3x tempers, and to alloy EN AW-6063 in the T832 temper.3) Applies to all
38、alloys in T3, T4, T6, T66, T73, T8, T9 and Tx511 tempers.4) Applies to all alloys in O, H111 and Tx510 tempers.5) This tolerance applies for outside diameter only, i.e. tube in this size range can only be specified as Outside Diameter 3 WallThickness.6) Shall not apply to Tx510 or Tx511 tempers.Tabl
39、e 2 Tolerances on width, depth or width across flatsDimensions in millimetresWidth, depth or width across flatsMaximum allowable deviation of width, depth or width across flats at any point from the specified value1)OverUp to and includingNon-annealed and non heat treated tube2)Heat treated tube3)An
40、nealed tube4)$ 8180,200,300,6018300,250,400,8030500,350,501,050800,500,701,4801200,701,02,01202001,01,53,01) 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
41、 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 3 tolerance; wall thickness over 1,5 % up to and including 2,0 % of outside parameter: 2,0 3 tolerance;
42、wall thickness over 1,0 % up to and including 1,5 % of outside parameter: 3,0 3 tolerance; wall thickness over 0,5 % up to and including 1,0 % of outside parameter: 4,0 3 tolerance.2) Applies to all alloys in F, H1x, H2x, H3x tempers.3) Applies to all alloys in T3, T4, T6, T66, T73, T8, T9 and Tx511
43、 tempers.4) Applies to all alloys in O, H111 and Tx510 tempers.2.4 Wall thicknessThe tolerances on wall thickness are specified inTable 3.Table 3 Tolerances on wall thickness2.5 LengthIf fixed lengths are to be supplied, this shall be stated on the order. The maximum allowable tolerances on fixed length are specified in Table 4.If no fixed length is specified in the order, porthole tubes may be delivered in random lengths. The length range and the tolerances on the random len
