GB/T 22640-2023 English PDF

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GB/T 22640-2023: Test method for determining susceptibility to stress corrosion cracking of aluminum alloys
Status: Valid

GB/T 22640: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 22640-2023	699	Add to Cart	6 days	Test method for determining susceptibility to stress corrosion cracking of aluminum alloys	Valid
GB/T 22640-2008	319	Add to Cart	3 days	Test method of C-Ring sample to stress-corrosion cracking for wrought aluminium and aluminium alloys products	Obsolete

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Basic data

Standard ID: GB/T 22640-2023 (GB/T22640-2023)
Description (Translated English): Test method for determining susceptibility to stress corrosion cracking of aluminum alloys
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H25
Classification of International Standard: 77.040.99
Word Count Estimation: 34,321
Date of Issue: 2023-05-23
Date of Implementation: 2023-12-01
Older Standard (superseded by this standard): GB/T 22640-2008
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 22640-2023: Test method for determining susceptibility to stress corrosion cracking of aluminum alloys

---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.
ICS 77:040:99 CCSH25 National Standards of People's Republic of China Replacing GB/T 22640-2008 Test method for evaluation of stress corrosion susceptibility of aluminum alloy aluminum aloys Released on 2023-05-23 2023-12-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

foreword

This 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 replaces GB/T 22640-2008 "Stress Corrosion Test Method for Ring Specimens of Aluminum Alloy Processed Products", and GB/T 22640- Compared with:2008, except for structural adjustment and editorial changes, the main technical changes are as follows: a) The preparation of corrosive medium has been changed (see Chapter 4, Chapter 4 of the:2008 edition); b) The slow strain rate corrosion test machine is added (see 5:1); c) Added loading bracket (see 5:9); d) The test device for boiling sodium chloride solution has been added (see 5:10); e) Changed the C-ring sample diagram and sample size (see 6:2:1, 6:2:2 of the:2008 edition); f) A tensile test sample has been added (see 6:2:2); g) A bending beam specimen is added (see 6:2:3); h) The U-shaped test piece is added (see 6:2:4); i) The requirements for the test temperature have been changed (see 7:2:2, 7:2 of the:2008 edition); j) Changed the sample cleaning method (see 7:2:8, 7:13 of the:2008 edition); k) Changed the expression method of the sample results (see 7:3, 8:1 of the:2008 edition); l) The constant strain test method for bending beam specimens has been added (see Chapter 8); m) Added the U-shaped sample constant strain test method (see Chapter 9); n) Added constant load and constant strain test methods for tensile specimens (see Chapter 10); o) The test method for continuous increase in strain of tensile specimens has been added (see Chapter 11); p) Added the constant strain test method for boiling sodium chloride solution (see Chapter 12): Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by China Nonferrous Metals Industry Association: This document is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243): This document is drafted by: National Standard (Beijing) Inspection and Certification Co:, Ltd:, Southwest Aluminum (Group) Co:, Ltd:, Nonferrous Metal Technology Economic Research Institute Co:, Ltd:, Northeast Light Alloy Co:, Ltd:, Guangdong Haomei New Materials Co:, Ltd:, Liaoning Zhongwang Group Co:, Ltd: Division, Youyan Engineering Technology Research Institute Co:, Ltd:, Guangxi Nannan Aluminum Processing Co:, Ltd:, Shandong Nanshan Aluminum Co:, Ltd:, Central South University, Industrial Analysis and Testing Center of Guangdong Academy of Sciences, Northwest Aluminum Co:, Ltd:, CRRC Industrial Research Institute Co:, Ltd:, Chinalco Material Application Research Institute Research Institute Co:, Ltd:, CRRC Qingdao Sifang Co:, Ltd: The main drafters of this document: Li Pu, Fan Zhigang, Tang Zongyuan, Gu Liu, Hou Yi, Ding Gangping, Zhu Xiao, Liu Xijing, Yan Lizhen, Zheng Xu, Zhong Juan, Deng Yunlai, Sun Daxiang, Wang Shouye, Li Minggao, Wei Shaolin, Sun Lin: The release status of previous versions of this document and the documents it replaces are as follows: ---First published as GB/T 22640-2008 in:2008; --- This is the first revision: Test method for evaluation of stress corrosion susceptibility of aluminum alloy

1 Scope

This document describes the test method for stress corrosion susceptibility evaluation of wrought aluminum alloy products: This document is applicable to constant strain tests of C-ring specimens, constant strain tests of bending beam specimens, constant strain tests of U-shaped specimens, and tensile tests: Sample constant load test, tensile sample constant strain test, tensile sample continuous increase strain test, boiling sodium chloride solution constant strain test price: Other grades of aluminum alloy products can also refer to this document:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document: GB/T 3246:1 Deformed Aluminum and Aluminum Alloy Products Microstructure Test Method Part 1: Microstructure Test Method GB/T 3246:2 Microstructural test methods for wrought aluminum and aluminum alloy products Part 2: Low magnification test methods GB/T 6682 Analytical laboratory water specifications and test methods GB/T 8170 Rounding off rules for numbers and expression and determination of limit values GB/T 16865 Deformed aluminum, magnesium and its alloy processed products tensile test specimens and methods JJF1914 Calibration specification for metallographic microscope JJF1916 Scanning Electron Microscope Calibration Specification JJF (Nonferrous Metals) 0007 Calibration Specification for Slow Strain Rate Stress Corrosion Testing Machine JJF (non-ferrous metals) 0009 Calibration specification for periodic immersion test chamber JJG21 micrometer JJG30 Universal Caliper JJG34 indicator (pointer type, digital display type)

3 Method overview

After applying stress to the sample according to the specified loading method, the sample is fully immersed or partially immersed in the corrosive medium, and placed in a test ring with a certain temperature and humidity: In the environment, cracks or fractures appear in the sample until the specified time: Observe the corrosion phenomenon of the sample visually or under a microscope, or calculate the stress corrosion sensitivity Sensitivity index to evaluate the stress corrosion susceptibility of aluminum alloy products: According to the sample loading method, the test methods are divided into the following types: ---Constant load test: The load of the sample is constant or the load is within the accuracy of control during the test: The sample type is a tensile sample, and the loading method Loading for the bracket and testing machine, the impregnation methods are full immersion infiltration and periodic infiltration: The test method is the constant load test of tensile specimens: ---Constant strain test: The deformation displacement of the sample during the test is constant or the displacement is within the control accuracy: The sample type is C-ring sample, For tensile specimens, bending beam specimens, and U-shaped specimens, the loading method is bracket loading, and the impregnation methods are full immersion infiltration and periodic infiltration: try The test methods are constant strain test of C-shaped ring specimen, constant strain test of bending beam specimen, constant strain test of U-shaped specimen, constant strain test of tensile specimen ......

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