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1、International Standard $ 3306 0 a 4 4b!gBi!b ,NTSfqNAT,ONAL ORGAN,ZAT,ON FOR STANDARDIZATlON*ME)I(AYHAPOHAR OPrAHM3ALWR fl0 CTAHAAPTM3AWlHKJRGANlSATlON INTEANATIONALE DE NORMALlSATlON Plain end as-welded and sized precision steel tubes - Technical conditions for delivery Tubes de p b) reference to t
2、his International Standard; c) grade of steel; d) required condition of tubes at delivery; e) outside diameter and thickness; f) length. 4.2 Optional conditions Certain alternatives are permitted; other supplementary re- quirements may be specified and the purchaser shall state his requirements in h
3、is 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 by - the name of the product; - reference to this International Standard; - the grade of steel, the condition of tubes at deliver
4、y; - the outside diameter and the thickness. 1) At present at the stage of draft. (Revision of ISO/R 202-1961 which remains in force until publication of IS0 6492.) 2) At present at the stage of draft. (Revision of ISOIR 166-1960 which remains in force until publication of IS0 9493.) 1 Copyright Int
5、ernational 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 3306-1965 (E) Example : 5.2 Tube-making process As-welde
6、d and sized precision steel tubes, in accordance with IS0 3306, in steel R37, annealed in a controlled atmosphere (GKM), of outside diameter 25 mm, thickness 2 mm, in ran- dom lengths, shall be designated as Steel tubes IS0 3306-R37-GKM-25 x 2 The tubes shall be manufactured from either hot- or cold
7、-rolled steel strip longitudinally welded continuously by the passage of an electric current across the abutting edges without the ad- dition of filler metal and sized. For certain applications, the tubes may be heat-treated. The condition of the tubes at delivery shall be chosen from table 1. 5 Man
8、ufacturing processes 5.1 Steel-making processes and deoxidation 5.3 Heat treatment; delivery condition The tubes are normally delivered in one of the conditions shown in table 1. The tubes shall be manufactured from a steel produced by an open or electric hearth, or one of the basic oxygen steel-mak
9、ing processes. 6 Chemical composition, mechanical properties and weldability The method of manufacture and deoxidation process is left to the option of the manufacturer. 6.1 Chemical composition At the purchasers request, the supplier shall indicate the steel- making process and the deoxidation proc
10、edure used. Rimmed steel is permitted for steel grades R28, R33 and R37. 6.1 .l Ladle analysis On ladle analysis, the steel shall show the composition given in table 2, appropriate to the steel type specified. Table 1 - Delivery condition Description Explanation Symbol Mechanical properties As-welde
11、d and sized No heat treatment after the welding and sizing KM See table 3 process. For this reason, the tubes are Annealed Normalized workable only within certain undefined limits. After the final sizing process, the tubes are GKM See table 4 annealed in a controlled atmosphere. After the annealing
12、treatment, the tubes are GZF descaled mechanically or chemically (pickled). The tubes are heated to a temperature above NKM See table 5 the upper transformation point and cooled. Both stages of heat treatment are carried out in a controlled atmosphere. After the normalization treatment, the tubes NZ
13、F are descaled mechanically or chemically (pickled). Table 2 - Chemical composition on ladle analysis C Si Mn P S Grade) max. max. max. max. max. % % % % % I328 0,132) - 0.60 0,050 0,050 I333 0,162) - 0,70 0,050 0,050 I337 0,172) 0,35 0.8 0,050 0,050 I344 0,21 0,35 12 0,050 0,050 R50 0,23 0.55 13 0,
14、050 0,050 1) The designations used are provisional. 2) Rimmed steel may 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
15、 Technical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48 MDTNo reproduction or networking permitted without license from IHS -,-,- Is0 3306-1965 (El 6.1.2 Product analysis If a check analysis is required on tubes made from killed steel, the permissible deviations given in IS0 26CW3.appl
16、y. 6.2 Mechanical properties 6.2.1 The mechanical properties depend on the delivery con- dition. They are specified in tables 3, 4 and 5. For tubes delivered in the annealed condition, the yield stress may be taken as 59 % of the minimum tensile strength given in table 4, for the purpose of calculat
17、ing the test pressure. Table 3 - Mechanical properties in the as-welded and sized condition - KM I R, min. A min. on 5,65 flo Grade N/mm* % R20 300 10 R33 330 8 R37 400 7 R44 430 6 R60 520 5 Table 4 - Mechanical properties in the annealed condition - GKM and GZF Grade RZJ R33 R37 R44 R50 R, min. A m
18、in. on 5,65 -r N/mm* % 270 30 320 27 340 26 400 24 480 23 Table 5 - Mechanical properties in the normalized condition - NKM and NZF Grade R,H min. R, min. A min. on 5,65fi0 N/mm* N/mm* % R28 155 280 28 R33 195 320 25 R37 215 360 24 R44 25.5 430 22 R50 285 490 21 6.2.2 The tubes shall meet the approp
19、riate requirements of the tests given in clause 9 (see tables 6 and 7). 6.3 Weldability Tolerances on thickness are given in table 8. Tubes in the annealed or normalized-condition are suitable for welding without special precautions. For as-welded and sized tubes which are welded or brazed, the mech
20、anical properties in the heat-affected zone may be affected by the welding or braz- ing temperature. 7 Dimensions, masses and tolerances 7.1 Dimensions and masses 7.1.1 Diameters and thickness The dimensions for outside diameter and thickness are given in table 8. 7.1.2 Masses The mass per unit leng
21、th of the tubes is given in table 8, the values being taken from IS0 4200. 7.1.3 Lengths Concerning lengths, a distinction is drawn between : a) random lengths between 2 and 7 m : these are supplied if, when ordering, no special agreement is reached concern- ing tube length; b) exact length. 7.2 Tol
22、erances 7.2.1 Diameter The permissible variations on outside diameter given in table 8 apply to tubes in the as-welded and sized condition. As a result of distortion during annealing, with annealed and normalized tubes, the variations in diameter are greater; the permissible values are as follows: T
23、hickness, T (mm) Outside diameter, D (mm) TID 1120 TID II40 TID 1l60 TID 5OOmmbut 2OUOmmbut G5OOOmm +zmm 5OOOmmbut 67OOOmm +tmm 7OOOmm by agreement 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 St
24、raightness 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 tolerances may be agreed between the manufacturer and the purchaser.
25、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. When random lengths are supplied, they shall be mill-cut only and not subjected to end-finishing except that the ends shall be
26、 free from excessive external burrs. 8 Appearance and soundness 8.1 Appearance The tubes shall have a smooth external surface, the degree of smoothness depending on the method of manufacture. The tubes shall have a workmanlike finish but small imperfections are permissible provided that the thicknes
27、s remains within the lower tolerance limit. The external fin shall be removed but may still be visible. Where the internal fin is removed, the residual fin height shall not exceed 0,30 mm if removed by cutting and 0.50 mm if removed by rolling. Where the internal fin is not removed, the internal fin
28、 height shall not exceed 60 % of the thickness with a minimum of 080 mm. Tubes annealed or normalized in a controlled atmosphere may have a discoloration but shall be free from loose scale. 4 8.2 Rectification Surface imperfections may be dressed provided that the thickness after dressing remains wi
29、thin 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 quality control by the supplier. If required for tubes supplied against a particular order, this shall be specifically stated in the ord
30、er. 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. I. 1, 9.1.2 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 b
31、e 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 subjected to the following tests : a) b) cl d) visual inspection; tensile test; drift expanding test; or flattening test. Drift
32、 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 6 mm; in the case of all other dimensions and grades of steel, the flattening test shall be made where annealed or normalized tubes are con
33、- cerned. 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. 9.1.2 Definition of a lot: selection and preparat
34、ion 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 fractions of a lot comprising le
35、ss 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. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Te
36、chnical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48 MDTNo reproduction or networking permitted without license from IHS -,-,- 9.2 Test methods and results 9.2.3 Drift expanding test IS0 3308-1985 (El All tests shall be carried out at ambient temperature. 9.2.1 Tensile test In this tes
37、t, carried out in accordance with IS0 6692, 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 values obtained shall correspond t
38、o those given in table 5. 9.2.2 Flattening test The flattening test shall be carried out in accordance with IS0 6492. The test piece shall show neither crack nor fissure when the distance between the platens is not greater than the values given in table 6. The drift expanding test shall be carried o
39、ut in accordance with IS0 6493. The test piece shall show neither crack nor fissure before expansion reaches the values given in table 7. 9.2.4 Leaktightness test Tubes shall pass a hydraulic pressure test at a pressure of 5 MPa (50 bar). A different pressure may be used, by agree- ment between the
40、purchaser and the manufacturer. The manufacturer may 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. Table 6 - Flattening test (i
41、n circumstances where the diameter and thickness allow deformation of the test sample) Grade Delivery condition 1) The weld sha )e at 9o” to the direction of the force induced. R28 R33 II37 WI FE0 Normalized or annealed Distance between platens After the test carried out according to IS0 849211, the
42、 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 T*f is the thickness, in millimetres; D 2) is the outside diameter, in millimetres; c is the steel constant, varying with the grade Or09 0,09 O,J 0,07 0,= 2) Symbols
43、from IS0 3545. Table 7 - Drift expanding test (The internal fin may be removed before testing) Grade R28 Delivery condition Expansion11 lT4 4T6 % % 12 8 IItl I Normalized or annealed 12 8 10 6 8 5 1) T is the thickness in millimetres. 5 Copyright International Organization for Standardization Provid
44、ed 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 3308-1985 (E) 9.2.6 Control of dimensions The tubes shall be checked for compliance with diameter and thic
45、kness. 9.3 Invalidation of tests The 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 : a) the manu
46、facturers mark; b) the grade of steel (see table 2); cl the delivery condition. 11 Protection The tubes shall be delivered with surface protection. Unless otherwise agreed, the manufacturers standard mill protection may be used. 12 Documents If acceptance tests are agreed in the order, a works certi
47、ficate 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 reasonable time.
48、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 Licensee=NASA T
49、echnical Standards 1/9972545001 Not for Resale, 04/25/2007 02:10:48 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3308-1985 (EI Table 8 - Dimensions and masses per unit length Values in millimetres Thicknesses, f 10 % with f 0,2 mm min. 31 I (0,8) 1 1 1 (1,2) 1 1,5 1 (I,81 1 2 (2,2) 1 2,5 (2.8) ) 3 ( (3,5) 1 4 1 (4,5) 1 5 1 (55) 6 Masses per unit length, kg/m