GB/T 12606-2016 PDF English

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GB/T 12606-2016: Automated full peripheral flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal and/or transverse imperfections
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GB/T 12606: Historical versions

Standard ID	USD	BUY PDF	Delivery	Standard Title (Description)	Status
GB/T 12606-2016	90	Add to Cart	Auto, 9 seconds.	Automated full peripheral flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal and/or transverse imperfections	Valid
GB/T 12606-1999	399	Add to Cart	3 days	Steel tubes. The testing method of magnetic flux leakage	Obsolete
GB/T 12606-1990	RFQ	ASK	3 days	Magnetic leakage flux testing method of steel tubes and bars	Obsolete

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GB/T 12606-2016: Automated full peripheral flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal and/or transverse imperfections

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Automated full peripheral flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal and/or transverse imperfections ICS 77.040.20 H26 National Standards of People's Republic of China Replacing GB/T 12606-1999 Seamless and welded (except submerged arc) ferromagnetic steel Full-circle longitudinal and/or transverse magnetic flux leakage testing imperfections automatic (Exceptsubmergedarc-welded) ferromagneticsteeltubesforthe (ISO 10893-3.2011, Non-destructivetestingofsteeltubes-Part 3. welded (exceptsubmergedarc-welded) ferromagneticsteeltubesforthe detectionoflongitudinaland/ortransverseimperfections, IDT) Published 2017-07-01 2016-08-29 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China issued

Table of Contents

Preface Ⅰ 1 Scope 1 2 Normative References 1 Terms and definitions 1 3 4 General requirements 2 5 Detection Method 2 Comparative 4 sample tube 6 7 equipment calibration and verification 6 8 acceptance 6 9 Test Report 6 Limitations (normative) method for detecting magnetic leakage Appendix A 7

Foreword

This standard was drafted in accordance with rules GB/T 1.1-2009 given. Instead of the standard GB/T 12606-1999 "steel flux leakage testing method", compared with the GB/T 12606-1999, Technical change as follows. --- modify the scope of the standard (see Chapter 1, 1999 edition of the Chapter 1); --- increase the content of normative references, terms and definitions, the general requirements (see Chapter 2, Chapter 3, Chapter 4); --- not modify the processing of the inner surface of the inner diameter of pipe groove range (see 612, 1999 edition 6.1.5.); --- modify the contrast material selection requirements like tubes (see 613, 1999 edition of 6.3.1.); --- modify the pore size range of drilling (see 612, 1999 edition of 6.2.3.); --- modify requirements groove width and length (see 622, 1999 edition of 6.1.4.2 and 6.1.4.3..); --- modify the acceptance level and logo (see Table 1, Table 1 of the 1999 edition); --- delete the contents of the principle of testing, testing equipment (Chapters 3 and 4 of the 1999 edition); --- increase the requirements for the number of re-testing (see 8.2); --- modify the contents of Appendix A, deleted Annex B (see Appendix A, 1999 edition of Appendix B). This translation method using identical with standard ISO 10893-3.2011 "NDT steel Part 3.seamless and welded (SAW Excluded) ferromagnetic steel longitudinal and/or transverse imperfections Automatic full peripheral flux leakage testing. " Consistency correspondence relationship with the international standard in normative documents referenced in our files are as follows. --- GB/T 9445-2008 NDT personnel qualification and certification (ISO 9712.2005, IDT) The standard proposed by China Iron and Steel Association. This standard by the National Steel Standardization Technical Committee (SAC/TC183). This standard was drafted. Tianjin Pipe Group Co., Ltd., Hengyang Valin Steel Tube Co., Ltd., Metallurgical Industry Information Standards Institute. The main drafters. Zhao Renshun, An Jianbo, Zhao Bin, Dong Li, Zhang Li. This standard supersedes the previous editions are. --- GB/T 12606-1999. Seamless and welded (except submerged arc) ferromagnetic steel Full-circle longitudinal and/or transverse magnetic flux leakage testing imperfections automatic 1 Scope This standard specifies the seamless and welded (except submerged arc) the whole circumference of ferromagnetic steel automatic defect detecting magnetic leakage requirements. Unless otherwise specified in the purchase order, this standard is mainly used for the detection of longitudinal imperfections. This standard is suitable for detecting an outer diameter of 10mm is greater than or equal to steel. This standard is also applicable to the detection of the hollow profile. 2 Normative references The following documents for the application of this document is essential. For dated references, only the edition cited applies this file. For undated references, the latest edition (including any amendments) applies to this document. ISO 9712 NDT personnel qualification and certification (Non-destructivetesting-Qualificationandcertifica- tionofNDTpersonnel) NDT ISO 11484 owner of the steel product qualification system [Steelproducts-Employer􀆳s qualification systemfornon-destructivetesting (NDT) personnel] 3 Terms and Definitions Defined in ISO 11484 and the following terms and definitions apply to this document. 3.1 Standard contrast defect referencestandard Artificial defect nondestructive testing apparatus (such as drilling, grooves and dents) for verification. 3.2 Comparative sample tube referencetube Comparison to a standard steel contains defects or pipe section. 3.3 Comparative sample referencesample Comparison of standard samples containing defects (e.g., pipe, sheet or strip). NOTE. This standard uses only the term "control sample tubes", also includes the term "comparative sample." 3.4 Tube tube Any cross-sectional shape of the opening ends of the hollow elongated products. 3.5 Seamless seamlesstube The solid product obtained a perforated hollow tube, and then by hot working or cold working to obtain the final dimensions. 3.6 Pipe weldedtube By welding adjacent edges of the flat rolled together to make a tube, after welding can be performed hot or cold working, to give a final size. 3.7 Manufacturers manufacturer Products manufactured in accordance with relevant standards and statements delivered products meet the relevant standards applicable to all organizations in terms of requirements. 3.8 Protocol agreement At the time of inquiry and order, the contract between the manufacturer and the purchaser. 4 General requirements 4.1 Unless standards or purchaser and manufacturer agreed, full peripheral magnetic leakage detection to be operating in all the major steel production processes (Rolling, heat treatment, cold and hot processing, sizing and straightening the primary and the like) after completion of all of. 4.2 detected steel pipe should have enough flatness to ensure the effectiveness of detection. The surface should not affect detection reliability of foreign bodies. 4.3 Detection shall be according to ISO 9712, ISO 11484 or equivalent standard trained and qualified operator appointed by the manufacturer are eligible Carried out under the supervision of staff. In the case of testing by a third party, this shall be the purchaser agreed to consult with the manufacturer. The employer shall file a certificate issued by the authority to operate. NDT3 a non-destructive testing (NDT) operators shall be approved by the Employer Authorized officers. Note. The definition of the 1, 2 and 3 can be found in the corresponding international standards such as ISO 9712 and ISO 11484. 5 Detection 5.1 using a longitudinal magnetic flux leakage by detection of imperfections pipe (see FIG. 1), and/or lateral defect detected by mutual agreement (see FIG. 2). This standard No registration predetermined wall thickness limits, given the limitations described in Appendix A of the detection method. Pipe ends have a short length can not be detected any undetected tube end should be carried out in accordance with the requirements of the product standards of the respective Line processing. 5.2 In the detection process, steel pipe and a sensor motion relative to each other due to scanning the entire surface of the steel pipe. Relative detection process Velocity variations are not to exceed ± 10%. 5.3 the maximum width of each sensor is parallel to the main axis for detecting defects should be 30mm. 5.4 automatic equipment should trigger an alarm level of binding of the labeled and/or separation system into the steel-defective products or suspicious. a) rotating magnetic flux leakage sensor technology advances straight steel --- b) fixing the magnetic flux leakage sensor coil steel technology advances --- Description. 1 --- magnetic flux leakage sensor; 2 --- steel; N --- Arctic; S --- South Pole. a rotational direction of the probe. Pipe rotation direction b. 1 a schematic longitudinal cutaway magnetic flux leakage inspection Description. 1 --- staggered array sensor; 2 --- Power (DC). NOTE. MFL sensor may take many forms, for example. the absolute and differential modes, depending on the equipment used and other factors. In addition to this method of FIG display, Other methods of magnetic flux is parallel to the pipe axis may also be employed. FIG 2 a schematic transverse magnetic flux leakage inspection imperfections Comparative sample tube 6 6.1 General 6.1.1 Comparison calibration standard defect for nondestructive testing equipment. These standard dimensions should not be considered defects such devices can be detected The minimum size of the defect. Each probe 6.1.2 magnetic flux leakage testing apparatus should be used in comparative sample tube outer face, the outer face of the groove than the groove ratio be verified or inside. Purchaser also be agreed with the manufacturer, the control sample using a radial through-hole tube calibration equipment. In this case, it should be a specific test Maximum pore received level agreement, and the manufacturer should be able to justify the use of the aperture device disposed corresponding to detection sensitivity and usage rule The outer face of a given depth than the comparative sensitivity of the inner surface of the groove and the groove depth of the obtained protocol. Note. The use of defined pore size steel according to standards or other relevant factors. Typical pore size in the range of 0.80mm ~ 3.20mm. Before the comparison processing tank surface, the inner surface of the comparative sample tube may be grinding or machining. When the inner diameter steel pipe to make not less than 20mm Inner surface of the groove, the manufacturer unless otherwise agree available, or while the pipe wall thickness is greater than 20mm, but due to the technology described in Appendix A Limit, even with the maximum rate in Table A.1, the detection of the inner surface of the steel pipe is not sufficient. 6.1.3 Comparison sample tube and the subject steel should have the same nominal diameter and wall thickness, the surface state and the same delivery conditions (e.g., as-rolled condition, n Fire, quenching and tempering) and similar grade (grade). Said the thickness of more than 10mm, if the groove depth of the subject is based on the nominal pipe wall Thick calculated, comparison may be greater than the wall thickness of the tube-like male subject said steel pipe wall thickness. If required, the manufacturer should be able to prove their method of Effectiveness. 6.1.4 should be separated from each other between the outer surface of the groove and the inner surface of the groove and the through holes may be used with the control sample, and the tube end portions thereof to each other (when the same When using the inner and outer grooves comparison), so as to obtain a display signal legible. 6.2 groove Comparison 6.2.1 General a) Comparative groove should be "N" shaped groove (see FIG. 3), and should be parallel to the main pipe; purchaser when the manufacturer agreed detects lateral missing When less Comparative steel shaft should be perpendicular to the slot (see FIG. 4); Nominally both sides b) should be parallel grooves, and groove bottom sides should be nominally at right angles; c) Comparative grooves should be machined, spark erosion or other production methods. NOTE. The bottom corner or a groove may be arcuate. Description. --- width W; d --- depth. FIG 3 "N" shaped grooves a) an outer partial surface of the circumferential groove b) the inner surface of the partial circumferential groove Description. d --- depth. FIG 4 allows the shape of transverse grooves 6.2.2 Comparison of the size of the slot a) a width, w (see FIG. 3) Comparative groove width should be 1mm or less in its depth, of whichever is greater. b) the depth, d (see FIG. 3 and FIG. 4) The appearance of the face than the depth of the groove to comply with Table 1, and meet the following requirements. --- minimum groove depth. acceptance level for F2 and F3 is 0.30mm; acceptance level for F4 and F5 is 0.50mm; --- maximum groove depth. 1.5mm. The inner surface of the groove depth should be subject to the purchaser with the manufacturer protocol (see Appendix A), but not less than the predetermined depth of the outer surface of the groove is greater than or Maximum ratio given in Table A.1.The maximum depth of the inner surface of the groove should be 3.0mm. The groove depth should allow tolerance of ± 15% for the deep groove. c) length Unless otherwise specified standard product manufacturer or purchaser agreed slot length should be greater than the width of each sensor. In any case Under conditions slot length should not exceed 50mm. If the detected lateral imperfections, the minimum length of the circumferential groove (see FIG. 4) shall be 25mm. Table 1 acceptance level and the corresponding outer surface of the groove depth Acceptance levels groove depth is a percentage of the nominal wall thickness F2 5 (minimum 0.30mm)% F3 10% (minimum 0.30mm) F4 12.5 (minimum 0.50mm)% F5 15 (minimum 0.50mm)% Note. In all relates to nondestructive testing of standard steel, it is the same for a predetermined groove depth value corresponding to a different category in this table acceptance level. Although Than the standard defects are the same, but a variety of detection methods may have different test results. Therefore, acceptance level prefix F (MFL) to avoid Free direct equivalent other detection methods. 6.2.3 Comparison of defect verification standard Comparative groove size and shape should be verified by appropriate technologies. 7 equipment calibration and verification 7.1 Comparison standard shall be verified at each detection cycle starts, the device to produce a clear consistent defect signal recognizable (e.g., Comparative Three consecutive signal sample tube through the apparatus). These signals are used to trigger their respective alarm levels. 7.2 in the verification and the verification process, the relative moving velocity between the sensor and the control sample tubes should be consistent with the normal production speed. 7.3 In the same nominal diameter, wall thickness, and grade of steel production testing process, regularly use the verification check value comparison sample tube devices. The frequency should be at least once every 4h verification check, and at the beginning of the rotation and shift production equipment operation and at the end should also be check. 7.4 If any of the parameters is changed using the initial check, the device should be re-verified. 7.5 If the checksum verification in production testing does not satisfy the verification requirement, since the last check of all steel pipe should be re-qualified in equipment Re-tested after calibration. 8 Acceptance 8.1 generate an alarm below the trigger level signal pipe should be regarded as qualified products. Producing greater than or equal to 8.2 level of a signal to trigger an alarm should be considered suspicious steel product, or the manufacturer may decide to re-testing. in case After re-tested twice in a row, all the signals are below the trigger level alarm, steel pipe should be regarded as qualified products; otherwise, shall be deemed to steel Suspicious goods. 8.3 pairs of suspect products, according to the requirements of the standard product should be one or more of the following processes. a) should be suspect areas or grinding process using the appropriate method. After confirmed that the remaining wall thickness within the allowed tolerance range, this steel The method should be previously specified retested. If no alarm signal is greater than or equal to the trigger level, this steel should It is considered qualified. Suspicious region may employ other detection methods NDT and re-testing, the manufacturer purchaser Acceptable protocol acceptance levels. b) the suspect areas should be cut. c) steel tubes should be considered defective. 9 test report As specified, the manufacturer should test reports purchaser, comprising at least the following information. a) standard number; b) Description of compliance; Any deviation, a predetermined protocol c), or other program file; d) the product grade and specifications; Type e) detecting technique and details; Equipment calibration process f) used; g) comparison of the standard description of the defect level of acceptance; h) the date of detection; i) The operator qualifications. Appendix A (Normative) Limitations of magnetic flux leakage inspection method A.1 General Application of this detection method, the test product is placed in a strong external magnetic field magnetic saturation, magnetic saturation is intended to provide a leakage defect position magnetic field. When the magnetic flux leakage testing the steel pipe, the surface of the steel pipe adjacent the leak detection sensitivity of the magnetic sensor at the top, and with the wall thickness increases from the sky Low, because the steel pipe inner surface imperfections less than the outer surface imperfections of the effective magnetic flux, resulting in signals in response to the same size may be surface imperfections A response signal is less than the outer surface. When more than a certain thickness, the purchaser agreed with the manufacturer, it is necessary to increase the inner surface of the groove so that a depth value exceeds a predetermined outer surface of the groove Depth value, the test equipment and the steel surface state depends on factors such as the increased value is used. Therefore, Table A.1 generally applicable. Table A.1 different thickness of the inner surface of the outer surface of the groove depth and the groove depth of maximum ratio Nominal wall thickness T mm The maximum ratio of depth of the inner surface of the groove and the outer surface of the groove depth F2 F3/F4/F5 8 \u003cT≤12 2.0 1.2 12 \u003cT≤15 2.5 1.5 15 \u003cT≤20 3.0 2.0 Note. the inner surface of the groove of minimum depth 0.4mm. A.2 fixed or rotating magnetic flux leakage sensor This detection technique using one or more sensors depicts a spiral track on the surface of the steel pipe, and therefore, it is best detected longitudinal imperfections Small pitch length depends on the width and the detection sensor. This detection technique is generally considered undetectable transverse imperfections. A.3 multi-sensor technology This detection technique is the use of a plurality of fixed sensors surrounding the steel linear motion. Thus, this technique detects lateral imperfections The minimum length depends on the circumferential dimension of the sensor. This detection technique is generally considered undetectable longitudinal imperfections, unless they have a Valid transverse direction (oblique) component. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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