Standard No.:	GB/T 42673-2023
English Name:	Non-destructive testing of steel tubes―Magnetic particle inspection of seamless and welded ferromagnetic steel tubes for the detection of surface imperfections
Chinese Name:	钢管无损检测 铁磁性无缝和焊接钢管表面缺欠的磁粉检测
Chinese Classification:	H26    Metal nondestructive testing method
Professional Classification:	GB    National Standard
ICS Classification:	77.040.20 77.040.20    Non-destructive testing of metals 77.040.20
Issued by:	SAMR; SAC
Issued on:	2023-08-06
Implemented on:	2024-3-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	5500 words
Price(USD):	165.0
Delivery:	via email in 1~3 business day

GB/T 42673-2023 Non-destructive testing of steel tubes - Magnetic particle inspection of seamless and welded ferromagnetic steel tubes for the detection of surface imperfections 1 Scope This document specifies requirements for magnetic particle inspection of seamless and welded ferromagnetic steel tubes for the detection of surface imperfections on the tube body and the end/bevel face at the ends. For the tube body, it specifies requirements for the detection of surface imperfections on all or part of the outside surface of tubes. However, by agreement between the purchaser and manufacturer, it can be applicable to the inside surface over a limited length from the ends of tubes, dependent on the tube diameter. In addition, this document can be used, as appropriate, to locate the position of external surface imperfections detected by another non-destructive testing method (e.g. ultrasonic) prior to dressing of the tube surface, and to ensure complete removal of the imperfection after dressing is complete. For the end/bevel face at the ends of plain-end and beveled-end tubes, this document specifies requirements for the detection of laminar imperfections which can interfere with subsequent fabrication and inspection operations (e.g. welding and ultrasonic inspection of the welds). This document is applicable to the detection of imperfections, other than laminar imperfections, on the end/bevel face. In this case, magnetization is applied in the direction essentially perpendicular to the orientation of the particular imperfections being detected. It can also be applicable to the testing of hollow sections. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 9712 Non-destructive testing - Qualification and certification of personnel ISO 9934-1 Non-destructive testing - Magnetic particle testing - Part 1: General principles ISO 9934-2 Non-destructive testing - Magnetic particle testing - Part 2: Detection media ISO 9934-3 Non-destructive testing - Magnetic particle testing - Part 3: Equipment ISO 10893-8 Non-destructive testing of steel tubes - Part 8: Automated ultrasonic testing of seamless and welded steel tubes for the detection of laminar imperfections ISO 11484 Steel products - Employer's qualification system for non-destructive testing (NDT) personnel Copyright International Organization for Standardization 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 9934-1 and ISO 11484 and the following apply. 3.1 tube hollow long product open at both ends, of any cross-sectional shape 3.2 seamless tube tube made by piercing a solid product to obtain a tube hollow, which is further processed, either hot or cold, into its final dimensions 3.3 welded tube tube, made by forming a hollow profile from a flat product and welding adjacent edges together, and which after welding can be further processed, either hot or cold, into its final dimensions 3.4 manufacturer organization that manufactures products in accordance with the relevant standard(s) and declares the compliance of the delivered products with all applicable provisions of the relevant standard(s) 3.5 agreement contractual arrangement between the manufacturer and purchaser at the time of enquiry and order 4 General requirements 4.1 Unless otherwise specified by the product standard or agreed on by the purchaser and manufacturer, a magnetic particle inspection shall be carried out on tubes after completion of all the primary production process operations (rolling, heat treating, cold and hot working, sizing, primary straightening, etc.). 4.2 The surface of the tube and of the end/bevel face at both tube ends being tested shall be sufficientlyclean and free of oil, grease, sand or scale or any other foreign matter which can interfere with the correct interpretation of the indications obtained from the magnetic particle inspection. The type of indications, as well as the minimum dimension of the surface imperfections being detected, depends on the specific tube manufacturing process and the surface finish. 4.3 This inspection shall be carried out by trained operators qualified in accordance with ISO 9712, ISO 11484 or equivalent, and supervised by competent personnel nominated by the manufacturer. In the case of third-party inspection, this shall be agreed on between the purchaser and manufacturer. The operating authorization issued by the employer shall be according to a written procedure. NDT operations shall be authorized by a level 3 NDT individual approved by the employer. Note: The definition of levels 1, 2 and 3 can be found in appropriate International Standards, e.g. ISO 9712 and ISO 11484.