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1、International Standard 3305 0 a 4 4g!ib INTERNATIONAL ORGANIZATION FOR STANOARDIZATION*MEYHAPOAHAR OPrAHM3AlMR fl0 CTAHAPTl43Al reference to this International Standard; grade of steel; required condition of tubes at delivery; outside diameter and thickness; length. 4.2 Optional conditions Certain a
2、lternatives are permitted; other supplementary re- quirements may be specified and the purchaser shall state his requirements in his enquiry and order; if he does not do so, supply will be made at the option of the manufacturer. 4.3 Designation The tubes shall be designated in the following sequence
3、 by - the name of the product; - reference to this International Standard; - the grade of steel, the condition of tubes at delivery; - the outside diameter and the thickness. 1) At present at the stage of draft. (Revision of ISOIR 202-1961 which remains in force until publication of IS0 6492.) 2) At
4、 present at the stage of draft. (Revision of ISO/R 166-1960 which remains in force until eublication of IS0 6493.) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48 MDTNo
5、reproduction or networking permitted without license from IHS -,-,- IS0 3305-1985 (E) Welded precision steel tubes, in accordance with IS0 3305, in steel R37, annealed in a controlled atmosphere (GBK), of out- side diameter 25 mm, thickness 2 mm, in random lengths, shall be designated as Steel tubes
6、 IS0 3306-R37-GBK-26 x 2 5 Manufacturing processes 5.1 Steel-making processes and deoxidation The tubes shall be manufactured from a steel produced by an open or electric hearth, or one of the basic oxygen steel-making processes. The method of manufacture and deoxidation process is left to the optio
7、n of the manufacturer. At the purchasers request, the supplier shall indicate the steel- making process and the deoxidation procedure used. Rimmed steel is permitted for steel grades R28, R33 and R37 5.2 Tube-making process The tubes shall be manufactured from either hot- or cold-rolled steel strip
8、longitudinally welded continuously by the passage of an electric current across the abutting edges without the ad- dition of filler metal. They are normally cold-finished on both the inside and the outside surfaces. For certain applications, the tubes may be heat-treated. The condition of the tubes
9、at delivery shall be chosen from table 1. 5.3 Heat treatment; delivery condition The tubes are normally delivered in one of the conditions shown in table 1. 6 Chemical composition, mechanical properties and weldability 6.1 Chemical composition 6.1 .l Ladle analysis On ladle analysis, the steel shall
10、 show the composition given in table 2, appropriate to the steel type specified. Table 1 - Delivery condition Cold-finished/hard (cold-finished as-drawn) process. For this reason the tubes have only the upper transformation point and cooled. Both stages of heat treatment are carried out Table 2 - Ch
11、emical composition on ladle analysis C Si Mn P S Grade” max. max. max. max. max. % % % % % R28 0,132 - 0,60 0,050 0,050 I333 0,162 - 0,70 0,050 0,050 R37 0,172 0.35 03 0,050 0,050 R44 0,21 0.35 1.2 0,050 0,050 R!% 0.23 0.55 jr3 0,050 0,050 1) The designations used are provisional. 2) Rimmed steel ma
12、y be used for steel grades R28, R33 and R37. If used for R33 and R37, the carbon content may be increased to 0,19 % max. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48
13、MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3305-1965 (E) 6.1.2 Product analysis If a check analysis is required on tubes made from killed steel, the permissible deviations given in IS0 26W3 apply. 6.2 Mechanical properties 6.2.1 The mechanical properties depend on
14、the delivery con- dition. They are specified in tables 3, 4, 5 and 6. For tubes delivered in the annealed condition, the yield stress may be taken as 50 % of the minimum tensile strength given in table 5 for the purpose of calculating the test pressure. Table 3 - Mechanical properties in the cold-fi
15、nished, as-drawn condition - BK Grade R28 R33 R37 R44 R50 R, min. A min. on 5,65 o0 N/mm* % 400 8 420 6 450 6 520 5 600 4 Table 4 - Mechanical properties in the lightly cold-worked condition - BKW Grade R, min. A min. on 5,65 o0 N/mm* % R28 350 10 R33 370 10 R37 400 9 R44 450 8 R!N 550 7 Table 5 - M
16、echanical properties in the annealed condition - GBK and GZF I R, min. A min. on 5,65 f10 Grade N/mm* % Table 6 - Mechanical properties in the normalized condition - NBK and NZF Grade b) exact length. 7.2 Tolerances 7.2.1 Diameter The permissible variations on outside and inside diameter apply to co
17、ld-finished/hard and cold-finished/soft tubes, and are given in table 9. 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) Tolerance TID 1120 the v
18、alues given in table 9 TID II40 I,5 times the values given in table 9 TID II60 twice the values given in table 9 TID 5OOmmbut 62OOOmm 2COOmmbut 65OOOmm +imm +imm +Emm 5OOOmmbut 67000mm +lirnrn 7OOOmm by agreement If, in individual cases, lengths are required with a greater degree of accuracy, the pe
19、rmissible variations shall be agreed upon when ordering. 7.2.5 Straightness The tubes shall be straight. For diameters greater than or equal to 16 mm, the total bend shall not exceed 0,2 % of the overall length of the tube. The bend measured on any length of 1 m shall not exceed I,5 mm. Special tole
20、rances may be agreed between the manufacturer and the purchaser. 7.2.6 End preparation b) tensile test; 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. c) drift expanding test; or d) flattening te
21、st. 8 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- facture. The tubes shall have a workmanlike finish but small im- perfections are permissible provided that the thickness remains within
22、the lower tolerance limit. The interval fin on these tubes resulting from welding may still be visible, but the thickness at the weld shall be within the stipulated tolerances. In the case of tubes with an inside diameter less than 16 mm, for manufacturing reasons the requirement regarding a smooth
23、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 f
24、ree from loose scale. 8.2 Rectification Surface imperfections may be dressed provided that the thickness after dressing remains within the lower tolerance limit. Peening of surface defects is not permitted. 9 Inspection and testing 9.1 General requirements Tests are normally applied only as a qualit
25、y 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 sub- jected to a final inspection prior to delivery, following the indications given in 9.1 .l, 9.1.2 and 9.
26、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. 9.1.1 Summary of tests The tubes shall be
27、 subjected to the following tests : a) visual inspection; Drift expanding tests shall be made only in the case of tubes made from R28, R33, R37 and FM4 in an annealed or normalized condition where thickness is between 1 and 8 mm; in the case of all other dimensions and grades of steel, the flattenin
28、g 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
29、 the order. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3305-1985 (E) 9.1.2 Definition
30、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 con- dition and dimension. All fractions of a lot comprising less than 200 tubes shall be considered as a complete lot. All
31、fractions of a lot compris- ing 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 tempera
32、ture. 9.2.1 Tensile test In this test, carried out according to IS0 6892, the tensile strength and percentage elongation shall be measured and the values obtained shall correspond to those in tables 3, 4 and 5. In the normalized condition, the upper yield strength shall also be measured and the valu
33、es obtained shall correspond to those given in table 6. 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 7. 9.2.3 Drift e
34、xpanding 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 8. Table 7 - Flattening test (in circumstances where the diameter and thickness allow deformation of the tes
35、t piece) Grade Delivery condition Distance between platens After the test carried out according to IS0 8492tr, the distance H, in millimetres, between the platens shall not be greater than the value given by the formula : H = (1 + cl T c + IT/D) where ?“*I is the thickness, in millimetres; Normalize
36、d or annealed D 2) is the outside diameter, in millimetres; c is the steel constant, varying with the grade : I328 O,W I333 O,W II37 609 R44 0,07 MO 0,06 I The weld shall be at 90 to the direction of the force induced. 2) Symbols from IS0 3545 Table 8 - Drift expanding test Expansion) Grade Delivery
37、 condition lT4 4T8 % % RZ8 12 8 R33 12 8 R37 Normalized or annealed 10 8 R44 8 5 1) T is the thickness in millimetres. 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48
38、MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3305-1985 (El 9.2.4 Leaktightness test Tubes shall pass a hydraulic pressure test at a pressure of 5 MPa 60 bar). A different pressure may be used, by agree- ment between the purchaser and manufacturer. The manufacturer ma
39、y substitute for this test another type of test which guarantees an equivalent quality. 9.2.5 Visual inspection With all tubes a visual inspection shall be made, as far as possible, of the external and internal surfaces. a) the manufacturers mark; b) the grade of steel (see table 2); c) the delivery
40、 condition. 11 Protection The tubes shall be delivered with surface protection. Unless otherwise agreed, the manufacturers standard mill protection may be used. 9.2.6 Control of dimensions 12 Documents The tubes shall be checked for compliance with diameter and thickness. 9.3 Invalidation of tests T
41、he specifications of IS0 404 apply. 9.4 Retest The specifications of IS0 404 apply. 10 Marking The tubes shall be marked by labels which are fixed securely to the bundle or crate containing the tubes, and which shall con- tain the following information : If acceptance tests are agreed in the order,
42、a works certificate shall be supplied, relating to the tests provided for in clause 9. The type of document supplied shall be in accordance with IS0 404. 13 Complaints after delivery In the event of a complaint, the manufacturer shall have an opportunity to check the merit of the claim within a reas
43、onable time. The contested items shall remain available for this purpose. In particular, if imperfections appear after subsequent use by the purchaser, it is necessary to submit the product to a check. Copyright International Organization for Standardization Provided by IHS under license with ISO Li
44、censee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO3305-1985(E) - - - - - - - 4 d B : . I F3 7 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48 MDTNo reproduction or networking permitted without license from IHS -,-,-