GB/T 4340.3-2025 English PDFUS$439.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 4340.3-2025: Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks Status: Valid GB/T 4340.3: Historical versions
Basic dataStandard ID: GB/T 4340.3-2025 (GB/T4340.3-2025)Description (Translated English): Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: N71 Classification of International Standard: 19.060; 77.040.10 Word Count Estimation: 22,279 Date of Issue: 2025-03-28 Date of Implementation: 2025-10-01 Older Standard (superseded by this standard): GB/T 4340.3-2012 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 4340.3-2025: Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. GB/T 4340.3-2025 English version. Metallic materials - Vickers hardness test - Part 3.Calibration of reference blocks ICS 19.060;77.040.10 CCSN71 National Standard of the People's Republic of China Replaces GB/T 4340.3-2012 Vickers hardness test of metal materials Part 3.Calibration of standard hardness blocks Part 3.Calibrationofreferenceblocks (ISO 6507-3.2018,MOD) Released on 2025-03-28 2025-10-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Manufacture of standard blocks 1 4.1 General 1 4.2 Thickness 1 4.3 Test surface area 1 4.4 Magnetism 1 4.5 Flatness and parallelism 2 4.6 Surface roughness 2 4.7 Preventing the test surface from being re-ground 2 5 Standard Vickers hardness tester 2 5.1 General 2 5.2 Direct Test 2 5.3 Traceability of inspection devices 2 5.4 Test force 2 5.5 Indenter 2 5.6 Diagonal measurement system 3 6 Calibration Procedure 4 7 Number of indentations 4 8 Hardness uniformity 5 8.1 Relative uniformity 5 8.2 Measurement uncertainty 6 9 Signs 6 10 Calibration Certificate 7 11 Validity 7 Appendix A (Informative) Adjustment of the Kohler Illumination System 8 A.1 General Principles 8 A.2 Kohler Illumination System 8 Appendix B (Informative) Measurement uncertainty of the average hardness value of the standard block 9 B.1 Overview 9 B.2 Direct inspection of standard machine 9 B.3 Indirect inspection of standard machines 9 B.4 Measurement uncertainty of standard blocks 11ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document is part 3 of GB/T 4340 "Vickers hardness test for metallic materials". GB/T 4340 has been published in the following parts. --- Part 1.Test methods; --- Part 2.Verification and calibration of hardness testers; --- Part 3.Calibration of standard hardness blocks; --- Part 4.Hardness value table. This document replaces GB/T 4340.3-2012 "Metallic materials Vickers hardness test Part 3.Calibration of standard hardness blocks" and Compared with GB/T 4340.3-2012, in addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Added requirements for the test surface area of standard blocks (see 4.3); ---Changed the test requirements of the standard Vickers hardness machine test force, and changed the accuracy of the test force of the standard machine under different test conditions Requirements (see 5.4, 4.4 of the.2012 edition); --- Changed the lower limit of the test force range of the standard Vickers hardness machine from "0.09807N" to "0.009807N" (see Table 1, Table 1 of the.2012 edition); --- The requirements for the geometric deviation of the indenter are added to the calibration certificate (see 5.5); --- Added the requirements for the maximum expanded uncertainty of the standard line scale (see 5.6); --- Changed the upper limit of the diagonal measurement range from "0.040mm" to "0.060mm" (see Table 2,.2012 Edition Table 2); --- Changed the requirements for test force duration and indenter approach speed (see Table 3, Table 3 of the.2012 edition); --- The maximum allowable value of uniformity has been changed (see Tables 4 to 8, Table 4 of the.2012 edition). This document is modified to adopt ISO 6507-3.2018 "Metallic materials Vickers hardness test Part 3.Calibration of standard hardness blocks". Compared with ISO 6507-3.2018, this document has made the following structural adjustments. --- Appendix A corresponds to Appendix B of ISO 6507-3.2018; --- Appendix B corresponds to Appendix A of ISO 6507-3.2018. This document contains technical differences from ISO 6507-3.2018.The clauses involved in these differences have been marked in the outer margins. The technical differences and their causes are as follows. --- ISO 6507-1 was replaced by GB/T 4340.1, which is a modified international standard [see the first paragraph of Chapter 6, 10d)] to adapt to Our country's technological conditions; --- ISO 6507-2 (see 5.1, 5.5) was replaced by GB/T 4340.2, which is a modified international standard, to adapt to my country's technology condition; --- GB/T 13634, which is equivalent to the international standard, replaced ISO 376 (see 5.4) to adapt to my country's technical conditions. The following editorial changes were made to this document. --- In Table 3, the "approach speed of the pressure head" when "F < 1.961" is corrected to 0.015~0.07, and the "approach speed of the pressure head" when "F ≥ 49.03" is corrected to 0.015~0.07. Speed” was corrected to “0.05~0.2”; ---Added table titles for each table; ---Removed references. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee for Standardization of Testing Machines (SAC/TC122). This document was drafted by. Quanzhou Fengze Donghai Instrument Hardness Block Factory, Fujian Institute of Metrology, China Machinery Testing Equipment Co., Ltd. Company, Beijing Institute of Metrology and Testing Science, Henan Institute of Metrology and Testing Science, Beijing Great Wall Metrology of China Aviation Industry Corporation Testing Technology Research Institute, Jiangsu Institute of Metrology (Jiangsu Energy Measurement Data Center), Guangdong Radio and Television Measurement and Testing Group Co., Ltd. Nanchang Kuangshi Hardness Block Manufacturing Co., Ltd., Laizhou Huayin Testing Instrument Co., Ltd., Shanghai Yanrun Optical Machine Technology Co., Ltd., Zhejiang Geotechnical Instrument Manufacturing Co., Ltd., Shenyang University of Technology, Liaoshen Industrial Group Co., Ltd., China Aero Engine Chengdu Engine Co., Ltd., Beijing North Information Heng Metrology Testing Technology Co., Ltd., Henan Jiaotong Engineering Technology Group Co., Ltd., Edelson (Xiamen) Electronics Co., Ltd., Henan Jiaotong Vocational Industrial Technology College, China Southern Power Grid Internet Service Co., Ltd., Wuhan Fanzhou Zhongyue Alloy Co., Ltd., Lishui Valve Inspection Technology Research Institute, Zhejiang Huadian Equipment Testing and Research Institute Co., Ltd. The main drafters of this document are. Wang Ningxi, Lin Shuo, Ren Xia, Luo Xin, Ren Xiang, Chen Shilin, Li Bingying, Yang Zizhang, Kuang Wei, Wang Jingtao, Wei Hewen, Chen Ying, Yang Heran, Zhou Changyong, Liu Bo, Wu Pan, Pan Weilin, Wang Yating, Meng Jie, Lin Jun, Xu Shixiong, Fang Zhongshu, Li Rui, and Wang Jiajing. The previous versions of this document and the documents it replaces are as follows. ---GB/T 7663-1987 "Standard Vickers Hardness Block" was first issued in 1987; --- GB/T 17199-1997 "Calibration of standard Vickers hardness blocks (less than HV0.2)" was first issued in.1997; ---First revision in.1999, integrating GB/T 7663-1987 and GB/T 17199-1997 into GB/T 4340.3- 1999 "Metallic Vickers hardness test Part 3.Calibration of standard hardness blocks"; --- In.2012, the second revision was GB/T 4340.3-2012 "Metallic materials Vickers hardness test Part 3.Standard hardness test" Block calibration"; ---This is the third revision.IntroductionGB/T 4340 "Vickers hardness test for metallic materials" aims to standardize the test method and inspection of the Vickers hardness of metallic materials. The method, the calibration method of standard materials for indirect inspection of test instruments and the calculation table of Vickers hardness values are intended to consist of the following four parts. --- Part 1.Test method. The purpose is to establish the procedures and methods to be followed for Vickers hardness testing. --- Part 2.Inspection and calibration of hardness testers. The purpose is to specify the technical requirements and inspection and calibration requirements of Vickers hardness testers. method. --- Part 3.Calibration of standard hardness blocks. The purpose is to specify the technical requirements and calibration methods that standard Vickers hardness blocks must meet. --- Part 4.Hardness value table. The purpose is to give the calculated value of Vickers hardness of metallic materials. Vickers hardness test of metal materials Part 3.Calibration of standard hardness blocks1 ScopeThis document specifies the standard hardness blocks (hereinafter referred to as standard blocks) used for indirect testing of Vickers hardness testers as described in GB/T 4340.2. Manufacturing requirements and calibration methods. This document is only applicable to the calibration of standard blocks with a diagonal length of not less than 0.020 mm.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 4340.1 Metallic materials Vickers hardness test Part 1.Test method (GB/T 4340.1-2024, ISO 6507- 1.2023,MOD) GB/T 4340.2 Metallic materials Vickers hardness test Part 2.Verification and calibration of hardness testers (GB/T 4340.2- 2025,ISO 6507-2.2018,MOD) GB/T 13634 Calibration of standard dynamometers for uniaxial testing machines for metallic materials (GB/T 13634-2019, ISO 376. 2011, IDT)3 Terms and definitionsThere are no terms or definitions that require definition in this document. 4.Manufacture of standard blocks 4.1 General The standard block should be specially manufactured, and its manufacturing process should be such that the standard block obtains the necessary homogeneity, structural stability and uniformity of surface hardness and Long-term stability. 4.2 Thickness The thickness of the standard block should not be less than 5mm. 4.3 Test surface area The test surface area of the standard block should not be greater than 40cm2. 4.4 Magnetism The standard block should be non-magnetic. For steel standard blocks, the manufacturer should ensure that they are demagnetized after the manufacturing process (before calibration). ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 4340.3-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 4340.3-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 4340.3-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 4340.3-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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