International Standard (!@ 3304 0 Q 4 4!l! l INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON*ME~YHAPOflHAR OPTAHMBALWIR fl0 CTAH~APTH3Al&lWORGANlSATlON INTERNATIONALE DE NORMALISATION Plain end seamles[.]
I n tern ati o n al I N TERN ATI ON AL ORG AN I ZATI ON Pl n en d FOR Tu bes iii ? U DC for d e prkci si on Secon d STAN DARDI ZATl ON *M E~ YH APOflH AR seam l ess d i ti on s en edi ti on aci er, - S tan d ard OPTAH M BALWI R preci si on fl (! @ Q 4! l !4 l CTAH ~ APTH 3Al &l WORG AN l SATl ON steel tu bes - Descri ptors : pi pes properti es, I N TERN ATI ON ALE N ORM ALI SATI ON Tech n i cal san s sou d u re, rl extr&m i t& l i sses - Con d i ti on s tech n i q u es de l i vrai son 985-1 -1 Ref (tu bes) , DE d el i very 521 X43 23 m ech an i cal 3304 m etal del ivery tu bes, d i ti on s, steel tu bes, acceptan ce seam l ess tu bes, speci fi cati on s, d i m en si on s, tests, N o d esi g n ati on , I S0 3304-1 985 ch em i cal E) com posi ti on , testi n g i= z Pri ce based on pag es Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies) The work of preparing International Standards is normally carried out through IS0 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, governmental 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 IS0 Council They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting International Standard IS0 3304 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings This second edition cancels and replaces the first edition (IS0 3304-1 9751 , 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 Organization Printed in Switzerland for Standardization, 995 I NTERNATI ONAL Plain end seamless conditions Scope I S0 STAN DARD for and field precision steel tubes - This I nternati onal delivery of from the Standard of seamless grades mensional application A sh own have Tubes i n accordance wi th mainly for purposes where and, I f su ch tubes ment, they delivery selected i f requ ired, are shall ends, 2, I S0 I nternational for use only precision sh own di - i n table Technical = Elongation Standard attaches in i n the to di mensional hydraulic fi n i sh piping or fractu re, length as (L, ) , L, , a = percentage, s, = Cross-secti onal BK Col d-fi ni sh ed BKW = Lightly GBK = Annealed i n control led atmosphere G ZF = Annealed i n control led atmosphere NBK = N ormalized i n control l ed atmosphere N ZF = N ormalized i n control l ed atmosphere area of the of 5, 65 fl gauge length as-drawn col d-worked are used and su rface annealed after gauge 4200 importance used di ti on s m anu factu red wi th di mensions small thicknesses intended be technical plain i n table from th i s the with and i n those whi ch accuracy been specifies tubes of steel tolerances (E) delivery original for 3304-1 985 equip- and descaled and descaled normalized di ti on References I S0 404, I nformation Mandatory The Steel and steel produ cts - General technical delivery to purchaser and be supplied by the purchaser information shall state the fol l owi ng details in hi s enquiry order: requ irements I S0 25041 2, Steelprodu cts quirements I S0 3545, ci rcu l ar I S0 - Part 2: Steel Wrou g h t tubes cross-secti on 4200, General Plain tables forpressu re and - end seamless tu bu lar Symbols steel - Quality re- tubes shaped accessories welded and and masses per I S0 6892, Metallic materials - Tensile I S0 3432, Metallic materials - Tubes u ni t seamless Flattening quantity; b) reference c) grade d) required e) ou tside f) length length 8493, Metallic materials - Tubes - Certain test ) DrLft expanding test 2) Symbols D = Ou tsi de T = Thickness = Rnl R eH = diameter Tensile Upper of the strength yield of the tube wall strength in per square newtons per mill imetre square Standard; diameter of tubes and at deliven/; thi ckness; wi ll tubes - the - milli- metre conditions may are permitted; be specified in hi s enquiry be made and and at the opti on oth er the order; of the shall be designated name i n the of the produ ct; reference to thi s I nternational the grade of steel, the ou tside the diameter di ti on and the n ot his so, manu factu rer sequence by of tubes at delivery; thi ckness At present at the stage of draft (Revision of I SO/R 202-1 961 which remains in force u nti l publication of I S0 8492 ) At present (Revision of I SO/R 66-1 960 which remains in force u nti l publication of I S0 9493 ) of draft re- state Standard; 1) stage shall i f he does fol l owi ng 2) at the supplementary purchaser Designation The tube i n newtons di ti on alternatives requirements supply I nternational of steel; Optional qu irements I S0 to th i s - testing - a) with to be used i n specificati ons tubes, of di mensi ons purposes I S0 3304-1 985 (E) Example : Seamless precision i n steel R37, ou tsi de diameter steel annealed tubes, 25 m m , shall be designated i n accordance i n a control led thickness wi th I S0 atmosphere mm, i n random The tubes 3304, su rfaces lengths, treated as from Steel tubes I S0 3304-R-37-GBK-26 Manufacturing processes Steel-maki ng The tubes shall open or electric processes be m anu factu red The hearth, and from For certain di ti on on by a seamless both the applications, of the tubes i nside the process and tubes at delivery the may shall They ou tside be heat- be chosen H eat tubes shown be manu factu red col d-fi n i sh ed The table process x 5 shall are normally of (GBK) , Tube-making treatm ent: are i n table normall y delivery delivered condition in one of the condi ti ons deoxidation a steel produ ced or one of the basic oxygen by an Chemical properti es steel-making composition, and mechanical weldability processes, The steel used shall be kill ed to the option of the At the purchaser’s making process The m eth od of manu factu re m anu factu rer request, and the the supplier deoxidation shall indicate procedure the steel- sequ ent formed the Both Table The Ladle table - analysis Delivery the steel shall show 2, appropriate to the steel di ti on cold- worked) 1) composition On ladle analysis, u sed Table (lightly Chemical is l eft designations u sed processing within u pper stages - certain the transformation of heat Chemical are provisional tu be l i mi ts can (bendi ng, point treatment and be cold- expand- cooled are carried com positi on on ou t ladle analysis type the composi ti on specified given in IS0 3304-1 985 (El 6.1 Product analysis If a check analysis is required on tubes, the permissible deviations given in IS0 26CW2 apply 6.2 Mechanical properties 6.2.1 The mechanical properties depend on the delivery condition They are specified in tables 3, 4, and For tubes delivered in the annealed condition, the yield stress may be taken as 50 % of the minimum tensile strength given in table for the purpose of calculating the test pressure Table - Mechanical properties in the cold-finished, as-drawn Grade I328 R33 R37 R44 R50 R, properties A on 5,65 fi % 10 10 R, % 270 320 340 400 480 30 27 26 24 23 Table - Mechanical condition Grade R28 R33 R37 R44 R50 and masses Diameters and thickness Lengths Concerning lengths, a distinction is drawn between : a) random lengths between and m : these are supplied if, when ordering, no special agreement is reached concerning tube length; b) exact length 7.2 Tolerances 7.2.1 A on 5,65 fi N/mm2 R28 R33 R37 R44 R5O Dimensions 7.1 Table - Mechanical properties in the annealed condition - GBK and GZF Grade 7.1 masses and tolerances The masses per unit length are given in IS0 4200 - BKW 350 370 400 450 550 R33 R37 R44 R50 Dimensions, 7.1 Masses in the lightly N/mm2 I328 The dimensions for outside and inside diameter and thickness are given in table 6 R, Tubes in the annealed or normalized condition are suitable for welding without special precautions For cold-finished tubes which are welded or brazed, the mechanical properties in the heat-affected zone may be affected by the welding temperature A on 5,65 fi % condition Weldability 7.1 420 450 520 600 cold-worked 6.3 of - BK N/mm2 4co Table - Mechanical Grade condition 6.2.2 The tubes shall meet the appropriate requirements the tests given in clause (see tables and 8) Diameter The permissible variations on outside and inside diameter apply to cold-finished/hard and cold-finished/soft tubes, and are given in table As a result of distortion during annealing, with annealed and normalized tubes, the variations in diameter are greater; the permissible values are as follows : Thickness, T (mm) Outside diameter, D (mm) properties in the normalized - NBK and NZF R& R, N/mm2 N/mm* % 55 95 21 255 285 280 320 360 430 490 28 25 24 22 21 A on 5,65 Go Tolerance TID > II20 the values table TID < 1 20 and TID > ‘II40 I,5 times the values given in table TID < I/# twice the values given in table TID < l60 and TID > II60 given in 2,5 times the values given in table It is not possible in all cases to apply simultaneously all three permissible variations for outside diameter, inside diameter and thickness Tubes are generally ordered to outside diameter and thickness IS0 3304-1 985 (E) If the inside diameter is more important, tubes may be ordered to inside diameter and thickness or outside diameter and inside diameter Special tolerances may be agreed upon between the interested parties 7.2.2 Thickness Tolerances on thickness are given in table facture The tubes shall have a workmanlike finish but small imperfections are permissible provided that the thickness remains within the lower tolerance limit In the case of tubes with an inside diameter less than mm, for manufacturing reasons the requirement regarding a smooth internal surface is not fully observable Cold-finished tubes are permitted to have an adherent layer of phosphate and lubricant originating from the drawing process on the internal and external surface Tubes annealed or normalized in a controlled atmosphere may have a discoloration, but shall be free from loose scale 7.2.3 Ovality The permissible variations in the tube outside diameter include ovality 8.2 Rectification 7.2.4 Lengths Exact lengths : the following variations are permissible : Surface imperfections may be dressed provided that the thickness after dressing remains within the lower tolerance limit Peening of surface defects is not permissible Length Tolerance 656Omm +zmm >5OOmmbut &200Omm +imm >2OOOmmbut 5OOOmmbut 7OOOmm If, in individual cases, lengths are required with a greater degree of accuracy, the permissible variations shall be agreed upon when ordering 7.2.5 Straightness The tubes shall be straight For diameters greater than or equal to mm, the total bend shall not exceed 0,2 % of the overall length of the tube The bend measured on any length of m shall not exceed I,5 mm Special tolerances may be agreed between the manufacturer and the purchaser 7.2.6 End preparation The tube ends shall be cut nominally square to the axis of the tube By agreement between the interested parties, special end-finishing may be applied Appearance and soundness 8.1 Appearance The tubes shall have smooth external and internal surfaces, the degree of smoothness depending on the method of manu- Inspection and testing 9.4 General requirements Tests are normally applied only as a quality control by the supplier If required for tubes supplied against a particular order, this shall be specifically stated in the order According to the provisions of the order, the tubes may be subjected to a final inspection prior to delivery, following the indications given in 9.1 l, 9.1 and 9.2 Acceptance testing may be carried out by an agent appointed by the purchaser This agent may be an outside inspector or may be selected from the staff of the manufacturer The details of the acceptance testing shall be agreed upon at the time of ordering 9.1 Summary of tests The tubes shall be subjected to the following tests : a) visual inspection; b) tensile test; c) drift expanding test; or d) flattening test Drift expanding tests shall be made only in the case of tubes made from R28, 833, R37 and FM4 in an annealed or normalized condition where thickness is between and mm; in the case of all other dimensions and grades of steel, the flattening test shall be made where annealed or normalized tubes are concerned A leaktightness test is not normally provided for these tubes If these tubes are to be used for carrying fluids, and are in the normalized or annealed condition, they shall be tested The leaktightness test shall be specified on the order IS0 3304-1 985 (El 9.1 Definition of a lot; selection and preparation of test pieces The tubes subjected to acceptance tests shall be tested in lots A lot comprises 200 tubes of the same steel grade, delivery condition and dimension All fractions of a lot comprising less than 200 tubes shall be considered as a complete lot All fractions of a lot comprising less than 20 tubes shall be distributed among the other lots The tensile test and the drift expanding or flattening tests shall be carried out on one tube selected at random from each lot 9.2 Test methods and results All tests shall be carried out at ambient temperature 9.2.1 Tensile test In this test, carried out in accordance with IS0 6W2, the tensile strength and percentage elongation shall be measured and the values obtained shall correspond to those in tables 3, and In the normalized condition, the upper yield strength shall also be measured and the values obtained shall correspond to those given in table 9.2.2 Flattening test The flattening test shall be carried out in accordance with IS0 8492 The test piece shall show neither crack nor fissure when the distance between the platens is not greater than the values given in table 9.2.3 Drift expanding test The drift expanding test shall be carried out in accordance with IS0 8493 The test piece shall show neither crack nor fissure before expansion reaches the values given in table Table - Flattening test (in circumstances where the diameter and thickness allow deformation of the test piece) Grade Delivery condition Distance between platens After the test carried out according to IS0 9492, the distance H, in millimetres, between the platens shall not be greater than the value given by the formula : H= (l+c)T c + (T/D) where Normalized or annealed T ) is the thickness, in millimetres; D ) is the outside diameter, in millimetres; c is the steel constant, varying with the grade : 0,09 0,09 R-28 I333 0.09~ R37 R44 R50 - , , Tram , ibu s-m xi45 ,.-aII symools 0,07 606 Table - Drift expanding test Grade I?28 R33 Delivery condition R37 Normalized or annealed R44 ) T is the thickness in millimetres l