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1、BRITISH STANDARD CONFIRMED JULY 1990 BS 6323-7: 1982 (Reprinted, incorporating Amendment Nos. 1 and 2) Specification for Seamless and welded steel tubes for automobile, mechanical and general engineering purposes Part 7: Specific requirements for submerged arc welded steel tubes UDC 669.14 462.2:621
2、.774.21 BS 6323-7:1982 This British Standard, having been prepared under the direction of the Iron and Steel Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 December 1982 BSI 07-1999 The following BSI references relate to the work on this standa
3、rd: Committee reference PSE/8 Draft for comment 78/74961DC ISBN 0 580 12975 6 Cooperating organizations The Iron and Steel Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: British Constructional Steelwork Association Briti
4、sh Internal Combustion Engine Manufacturers Association British Ironfounders Association British Railways Board British Steel Industry* British Steel Industry Wire Section Concrete Society Ltd Council of Ironfoundry Associations Department of Industry (National Physical Laboratory) Electricity Suppl
5、y Industry in England and Wales Engineering Equipment Users Association Federation of Civil Engineering Contractors Institute of Quality Assurance Institution of Production Engineers Institution of Structural Engineers International Tin Research Institute Lloyds Register of Shipping National Associa
6、tion of Drop Forgers and Stampers Oil Companies Materials Association Process Plant Association Royal Institute of British Architects Society of Motor Manufacturers and Traders Ltd* Steel Casting Research and Trade Association Water-tube Boilermakers Association The organizations marked with an aste
7、risk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of Hydraulic Equipment Manufacturers British Steel Corporation British Welded Steel Tube Manufacturers Association Chartered
8、Institution of Building Services Confederation of British Industry Mechanical Handling Engineers Association Ministry of Defence Motor Cycle Association of Great Britain Coopted members Amendments issued since publication Amd.No.Date of issueComments 5143June 1986 6026June 1989Indicated by a sidelin
9、e in the margin BS 6323-7:1982 BSI 07-1999i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope1 2General1 3Method of manufacture1 4Delivery condition1 5Chemical composition1 6Mechanical properties1 7Dimensions and sectional properties1 8Tolerances1 9Tests2 Table 1 Chemical c
10、omposition and mechanical properties1 Table 2 Dimensions of submerged arc welded steel tubes2 Publications referred toInside back cover BS 6323-7:1982 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Iron and Steel Standards Committee. It is a combined stand
11、ard superseding BS 980:1950, BS 1775:1964 and BS 3014:1958 which are withdrawn. In BS 6323, manufacturing processes have been aligned with current procedures, and processes no longer used, i.e. oxy-acetylene welding and hydraulic lap welding, have been deleted. Terminology relating to the designatio
12、n of certain manufacturing processes has been updated, i.e. SAW replaces EFW, and CFS replaces CDS. Additionally, in combining the standards, steel grades have been rationalized and aligned, with delivery conditions now being clearly designated by letter codes. This standard is published in eight se
13、parate Parts as follows: Part 1: General requirements; Part 2: Specific requirements for hot finished welded steel tubes; Part 3: Specific requirements for hot finished seamless steel tubes; Part 4: Specific requirements for cold finished seamless steel tubes; Part 5: Specific requirements for elect
14、ric resistance welded (including induction welded) steel tubes; Part 6: Specific requirements for cold finished electric resistance welded (including induction welded) steel tubes; Part 7: Specific requirements for submerged arc welded steel tubes; Part 8: Specific requirements for longitudinally we
15、lded stainless steel tubes. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pa
16、ges This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cove
17、r. BS 6323-7:1982 BSI 07-19991 1 Scope This Part of BS 6323, which is used in conjunction with Part 1 of the same standard, covers the specific requirements for submerged arc welded steel tubes for use in the automobile, mechanical and general engineering industries. It specifies the chemical compos
18、ition, mechanical properties, dimensions, dimensional tolerances and technical delivery condition of the tubes. NOTE 1For tubes for pressure purposes, attention is drawn to BS 3601 to BS 3605 and for hollow sections for structural purposes to BS 4360 and BS 4848-2. NOTE 2The titles of the publicatio
19、ns referred to in this Part of this standard are listed on the inside back cover. 2 General The tubes shall comply with the general requirements of BS 6323-1 and the specific requirements of this Part of the same standard which covers tubes of 150 mm outside diameter and above. The tubes shall be of
20、 steel grades 4 and 5. The grade required shall be specified in the enquiry and order, together with other details as specified in clause 5 of BS 6323-1:1982 as appropriate. 3 Method of manufacture The tubes shall be manufactured by longitudinally butt welding preformed steel plate or skelp by an au
21、tomatic submerged arc welding process. 4 Delivery condition The tubes shall be supplied in one of the following delivery conditions. a) As-welded; b) Hot sized; c) Cold sized. NOTECold sized tubes may be heat treated at the option of the manufacturer. 5 Chemical composition The steel shall show on l
22、adle analysis the composition given in Table 1. 6 Mechanical properties The tensile properties of the tubes, appropriate to their steel grade, determined in accordance with 15.2 of BS 6323-1:1982 shall be as given in Table 1. For other mechanical properties, see clause 9. 7 Dimensions and sectional
23、properties The dimensions of the tubes most commonly used are given in Table 2 and the sectional properties in Appendix B of BS 6323-1:1982. 8 Tolerances 8.1 Outside diameter. The outside diameter of the body of the tube, as calculated from measurement of the circumference, shall not deviate from th
24、e specified diameter by more than o 0.75 %, or o 10 mm, whichever is the less. 8.2 Thickness. The tolerance on thickness, including eccentricity, shall be: apart from any external reinforcement at the weld: 8.3 Length. Tubes shall be supplied in either: a) random lengths of 6 m to 9 m; or b) specifi
25、ed cut lengths to the following tolerances: up to and including 6 000 mm: over 6 000 mm: NOTECloser tolerances may be obtained by agreement between the purchaser and the manufacturer. Table 1 Chemical composition and mechanical properties (see note) + 10 5 % + 10 5 mm + 15 0 mm Chemical composition
26、(ladle analysis)Mechanical properties DesignationC max. Si max. Mn max. P max. S max. Re min. Rm min. A min. SAW 4 SAW 5a % 0.25 0.23 % 0.35 0.50 % 1.20 1.50 % 0.050 0.050 % 0.050 0.050 N/mm2 235 340 N/mm2 410 490 % 22 20 NOTEWelding of tubes of these grades does not require special techniques but c
27、are should be taken and welding should be carried out in accordance with the guidance given in the appropriate British Standard for welding, e.g. BS 5135. a Grain refining elements may be added to this grade at the option of the manufacturer. BS 6323-7:1982 2 BSI 07-1999 9 Tests 9.1 General. In addi
28、tion to the tensile test specified in clause 6, the tubes shall be subjected to a bend test (strip) as given in 9.2. The tests shall be carried out in accordance with 15.4 of BS 6323-1:1982. 9.2 Bend test (strip). The diameter of the bar shall be six times the thickness of the test piece. The test p
29、iece shall show no significant crack or flaw. The opening out of a slight defect due to incomplete root penetration or lack of root fusion need not be considered a cause for rejection provided the defect has sound metal at the back and on each side of it. In borderline cases further tests shall be m
30、ade on test pieces from the same weld adjacent to the original test piece. Table 2 Dimensions of submerged arc welded steel tubes Outside diameter Thicknesses Minimum thickness Thicknesses in common usageMaximum thickness mmmmmmmmmmmmmm 508 559 610 660 711 762 813 864 914 1 016 1 220 1 420 1 620 1 8
31、20 2 020 6.3 6.3 6.3 6.3 7.1 7.1 7.1 7.1 8.0 8.0 10 12.5 12.5 12.5 12.5 8.0 8.0 8.0 8.0 8.0 10 10 10 10 12.5 12.5 12.5 16 16 16 10 10 10 10 10 12.5 12.5 12.5 12.5 16 16 16 20 20 20 12.5 12.5 12.5 12.5 12.5 16 16 16 16 20 20 20 25 25 25 16 16 16 20 20 20 25 25 25 20 20 32 32 32 32 32 32 45 50 50 50 5
32、0 50 50 NOTEOther outside diameters and thicknesses are available by agreement between the purchaser and the manufacturer. For sectional properties including mass per unit length, see Appendix B of BS 6323-1:1982. BS 6323-7:1982 BSI 07-1999 Publications referred to BS 3601, Steel pipes and tubes for
33、 pressure purposes: carbon steel with specified room temperature properties. BS 3602, Specification for steel pipes and tubes for pressure purposes: carbon and carbon manganese steel with specified elevated temperature properties. BS 3603, Specification for steel pipes and tubes for pressure purpose
34、s: carbon and alloy steel with specified low temperature properties. BS 3604, Specification for steel pipes and tubes for pressure purposes: ferritic alloy steel with specified elevated temperature properties. BS 3605, Seamless and welded austenitic stainless steel pipes and tubes for pressure purpo
35、ses. BS 4360, Specification for weldable structural steels. BS 4848, Hot-rolled structural steel sections. BS 4848-2, Hollow sections. BS 5135, Metal-arc welding of carbon and carbon manganese steels. BS 6323, Specification for seamless and welded steel tubes for automobile, mechanical and general e
36、ngineering purposes. BS 6323-1, General requirements. BS 6323-7: 1982 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international l
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