3305 Internationai Standard (ISO INTERNATIONALORGANIZATION FOR STANDARDIZATIONMEKAYHAPOAHAH OPTAHM3ALWA NO CTAHAAPTW3ALMM·ORGANISATION INTERNATIONALEDE NORMALISATION Plain end welded precision steel tubes - Technical conditions for delivery Tubes de precision en acier, soudes, a extremités lisses -- Conditions techniques de livraison Second edition - 1985-11-15 UDC 621.643.23 Ref. No. 1SO 3305-1985 (E) 1985 Descriptors : pipes (tubes), steel tubes, smooth tubes, welded tubes, precision tubes, specifications, chemical composition, mechanical 3305-1 properties, dimensions, tests, designation, delivery conditions, marking, acceptance testing. Price based on 7 pages Copyright International Organization for Standardization without license from IHS Not for Resale Foreword national standards bodies (ISo member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. international organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 3305 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings. This second edition cancels and replaces the first edition (ISO 3305-1976), of which it constitutes a technical revision. Users should note that all international Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. ? International Organizationfor Standardization,1985 Printed in Switzerland ed without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 3305-1985 (E) Plain end welded precision steel tubes -- Technical conditions for delivery Scope and field of application = Elongation after fracture, as a percentage, of A original gauge length (Lo), L。 = 5,65 S。 This International Standard specifies the technical conditions = Cross-sectional area of the gauge length S for delivery of welded tubes with plain ends, manufactured from the grades of steel shown in table 2, with precision di- BK = Cold-finished as-drawn BKW = Lightly cold-worked which have been selected from IS0 4200. GBK Annealed in controlled atmosphere Tubes in accordance with this International Standard are used mainly for purposes where importance attaches to dimensional GZF = Annealed in controlled atmosphere and descaled accuracy and, if required, small thicknesses and surface finish. NBK = Normalized in controlled atmosphere If such tubes are intended for use in hydraulic piping equip- NZF = Normalized in controlled atmosphere and descaled ment, they shall be used only in the annealed or normalized delivery condition. 4 Information to be supplied by the purchaser 4.1 Mandatory information 2 References The purchaser shall state the folowing details in his enquiry ISO 404, Steel and steel products - General technical delivery and order: requirements. a) quantity; Iso 2604/3, Steel products for pressure purposes Quality re b) reference to this International Standard; quirements -- Part 3: Electric resistance and induction-welded tubes. c) grade of steel; ISO3545,Steel tubesandtubularshapedaccessorieswith d) required condition of tubes at delivery; circular cross-section - Symbols to be used in specifications. e) outside diameter and thickness; Is0 4200, Plain end steel tubes, welded and seamless f) ength. General tables of dimensions and masses per unit length. 4.2 Optional conditions Iso 6892, Metallic materials - Tensile testing. Certain alternatives are pe