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GB/T 29503-2020 English PDF

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GB/T 29503-2020: Aluminium alloy stretched plates
Status: Valid

GB/T 29503: Evolution and historical versions

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GB/T 29503-2020English629 Add to Cart 6 days [Need to translate] Aluminium alloy stretched plates Valid GB/T 29503-2020
GB/T 29503-2013English260 Add to Cart 0--9 seconds. Auto-delivery Aluminium alloy stretched plates Obsolete GB/T 29503-2013

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Basic data

Standard ID GB/T 29503-2020 (GB/T29503-2020)
Description (Translated English) Aluminium alloy stretched plates
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H61
Classification of International Standard 77.150.10
Word Count Estimation 34,382
Date of Issue 2020-06-02
Date of Implementation 2021-04-01
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 29503-2020: Aluminium alloy stretched plates

---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.
Aluminium alloy stretched plates ICS 77.150.10 H61 National Standards of People's Republic of China Replace GB/T 29503-2013 Aluminum alloy pre-stretched board 2020-06-02 released Implementation on 2021-04-01 State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 29503-2013 "Aluminum Alloy Pre-stretched Plate". Compared with GB/T 29503-2013, this standard except for editorial The main technical changes are as follows. ---Added 2D12, 2D70, 2124, 2618A, 7B04, 7055, 7A85, 7475 grades, deleted.2017, 2A12, 6082 7A04, 7A09 alloys (see Chapter 3, Chapter 3 of the.2013 edition); ---Deleted the coating requirements (see 3.3 in the.2013 edition); ---Added the hydrogen content requirement (see 3.3); ---Modified the room temperature tensile mechanical properties requirements (see 3.5, 3.5 in the.2013 edition); ---Modified the room temperature compression performance requirements (see 3.6, 3.6 in the.2013 edition); ---Modified the fracture toughness requirements (see 3.7, 3.10 of the.2013 edition); ---Revised the stress corrosion performance requirements (see 3.9, 3.8 in the.2013 edition); ---Modified the exfoliation corrosion performance requirements (see 3.10, 3.9 in the.2013 edition); ---Modified the conductivity requirements (see 3.11, 3.7 in the.2013 edition); ---Modified the requirements of low-power organization (see 3.13, 3.13 in the.2013 edition); ---Inspection classification has been added (see 5.4); ---Added fatigue specimen and its processing requirements (see 5.6); ---Modified the inspection items (see 5.5, 5.4 in the.2013 edition); ---Added the fracture toughness test method (see Appendix A); --- Added C-ring stress corrosion test method (see Appendix B); ---Added the flaking corrosion sensitivity test method (see Appendix C). This standard was proposed by China Nonferrous Metals Industry Association. This standard is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243). Drafting organizations of this standard. Southwest Aluminum (Group) Co., Ltd., Non-ferrous Metal Technology and Economic Research Institute, Northeast Light Alloy Co., Ltd. Company, Youyan Engineering Technology Research Institute Co., Ltd., Guangxi Nannan Aluminum Processing Co., Ltd., Shandongnanshan Aluminum Co., Ltd., Tianjin Zhongwang Aluminum Industry Co., Ltd., National Standard (Beijing) Inspection and Certification Co., Ltd., Guangdong Industrial Analysis and Testing Center, China Aluminum Material Application Research Institute Co., Ltd. The main drafters of this standard. Zhang Zongquan, Ge Lixin, Li Wei, Zhao Yongjun, Li Xiwu, Wang Jun, Wu Zhenyu, Su Zhijun, Zu Licheng, Li Pu, Guo Carp, Xiao Xiang, Zhang Jianjun, Feng Chao. The previous versions of the standard replaced by this standard are as follows. ---GB/T 29503-2013. Aluminum alloy pre-stretched board

1 Scope

This standard specifies the requirements, test methods, inspection rules and signs, packaging, transportation, storage and quality certificates of aluminum alloy pre-stretched panels And the content of the purchase order (or contract). This standard applies to aerospace and other uses, after solution heat treatment, the aluminum alloy sheet is stretched according to the specified amount of 1.5% to 3% (below Referred to as plate).

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 3075 Axial force control method for fatigue test of metallic materials GB/T 3190 Chemical composition of wrought aluminum and aluminum alloy GB/T 3199 Packaging, marking, transportation and storage of aluminum and aluminum alloy processed products GB/T 3246.1 Microstructure inspection method for deformed aluminum and aluminum alloy products Part 1.Microstructure inspection method GB/T 3246.2 Microstructure inspection method for deformed aluminum and aluminum alloy products Part 2.Macrostructure inspection method GB/T 3880.3 General industrial aluminum and aluminum alloy plates and strips Part 3.Dimensional deviation GB/T 4161 Metallic materials plane strain fracture toughness KIC test method GB/T 6519 Ultrasonic inspection method for deformed aluminum and magnesium alloy products GB/T 7314 Room temperature compression test method for metallic materials GB/T 7999 Aluminium and aluminum alloy photoelectric direct-reading emission spectrum analysis method GB/T 8170 Numerical rounding rules and the expression and determination of limit values GB/T 12966 Eddy current test method for electrical conductivity of aluminum alloy GB/T 16865 Specimen and methods for tensile test of deformed aluminum, magnesium and alloy processed products GB/T 17432 Sampling method for chemical composition analysis of wrought aluminum and aluminum alloy GB/T 20975 (all parts) Chemical analysis methods for aluminum and aluminum alloys GB/T 22639-2008 Spalling corrosion test method for aluminum alloy processed products GB/T 22640-2008 Stress Corrosion Test Method for Ring Specimen of Aluminum Alloy Processed Products YS/T 600 Aluminum and Aluminum Alloy Liquid Hydrogen Measurement Method Closed Loop Method

3 requirements

3.1 Product Classification 3.1.1 Brand, supply status and size specifications The alloy grades, supply status and size specifications of the plates shall meet the requirements of Table 1.The buyer needs other grades, supply status, and size specifications The grid time is determined through negotiation between the supplier and the buyer, and is indicated in the order form (or contract). 4.2 Hydrogen content The solid-state hydrogen test is carried out according to the method specified in GB/T 20975.30, and the liquid hydrogen test is carried out according to the method specified in YS/T 600. 4.3 Dimensional deviation The measured value of the size of the plate is not allowed to be revised, and the determination method of the limit value should comply with the provisions of GB/T 8170. The method shall be inspected according to the method specified in GB/T 3880.3. 4.4 Tensile mechanical properties at room temperature The room temperature tensile test shall be tested according to the method specified in GB/T 16865. 4.5 Compression performance at room temperature The room temperature compression yield strength test method shall be tested according to the method specified in GB/T 7314. 4.6 Fracture toughness The plane strain fracture toughness shall be tested according to the method specified in Appendix A. 4.7 Fatigue performance Fatigue performance shall be tested according to the method specified in GB/T 3075. 4.8 Stress corrosion performance The stress corrosion performance shall be inspected according to the method specified in Appendix B. 4.9 Spalling corrosion performance The spalling corrosion performance shall be tested according to the method specified in Appendix C. 4.10 Conductivity The electrical conductivity test method is tested according to the method specified in GB/T 12966. 4.11 Ultrasonic flaw detection performance Ultrasonic flaw detection is carried out according to the method specified in GB/T 6519. 4.12 Macrostructure The macrostructure shall be inspected according to the method specified in GB/T 3246.2. 4.13 Microstructure The microstructure shall be inspected according to the method specified in GB/T 3246.1. 4.14 Appearance quality Under natural scattered light, visually inspect the appearance quality. When necessary, measuring tools can be used to define the size of the defect, and the depth of the defect can be determined by grinding. 5.7.6 When the fracture toughness of any sample is unqualified, the tensile strength is judged to be unqualified. 5.7.7 When the fatigue performance of any sample is unqualified, the tensile test shall be deemed unqualified. 5.7.8 When the stress corrosion performance of any sample is unqualified, the batch is deemed unqualified. But after allowing the supplier to supplement the time limit, There are performance items. 5.7.9 When the spalling corrosion performance of any sample is unqualified, the batch is deemed unqualified. But after allowing the supplier to supplement the time limit, There are performance items. 5.7.10 When the conductivity of any sample is unqualified, the tensile sheet is judged to be unqualified. However, sampling is allowed for stress corrosion performance and spalling corrosion When the performance test, stress corrosion performance and spalling corrosion performance test results are all qualified, the tensile test is judged to be qualified. If the stress corrosion performance or peeling If there are still samples that fail in the drop corrosion performance test results, the tensile tension is judged to be unqualified. However, the supplier is allowed to repeat the heat treatment and re-sampling Check all performance items. 5.7.11 When the ultrasonic inspection of any plate is unqualified, it shall be judged as unqualified. 5.7.12 When the fracture structure of any sample is unqualified, the tensile tension is judged to be unqualified; when other macroscopic structure items are unqualified, the batch is judged to be unqualified However, when the buyer agrees to the supplier’s inspection requirements, it can be inspected one by one, and the qualified products will be delivered. 5.7.13 When the microstructure of any sample is unqualified, the batch is deemed unqualified. 5.7.14 When the appearance quality of any sheet is unqualified, the sheet shall be deemed unqualified. 6 Marking, packaging, transportation, storage and quality certificate 6.1 Logo 6.1.1 Product mark 6.1.1.1 Surface marking Mark the following on the surface of each plate that has passed the inspection. a) Grade; b) Supply status; c) Number of this standard; d) Size specifications; e) Product batch number; f) Piece number (including sawing sequence number); g) Inspection and printing by the supplier's technical supervision department. 6.1.1.2 End marking For plates with a thickness greater than 12mm, mark the grade, supply status, batch number, and piece number (including the sawing sequence number) on the upper right corner of the transverse end surface. thick Plates with a degree of not more than 12mm shall not be marked on the end face. 6.1.2 Packaging box logo The marking of the packaging box of the plate shall comply with the provisions of GB/T 3199. 6.2 Packaging, transportation and storage The plates are not oiled, and the plates are packed with paper. Other packaging, transportation, and storage requirements are in accordance with GB/T 3199. 6.3 Quality certificate Each batch of plates should be accompanied by a product quality certificate, which should indicate. a) Supplier's name, address, telephone, fax; b) Product name; c) Brand, supply status and size specifications; d) Lot number; e) Net weight or number of sheets; f) Number of this standard; g) The analysis and inspection results of each inspection item and the inspection and printing of the technical supervision department; h) Packing date (or factory date). 7 Purchase order (or contract) content The order form (or contract) for the plates listed in this standard should include the following. a) Product name; b) grade; c) Supply status; d) Size specifications; e) Weight (or number of sheets); f) For 2124, 7050, 7075, 7150, 7475, 7B04, 7A85, 7055 plates, when the stress corrosion performance needs to be tested, it should be noted "Inspecting stress corrosion performance"; g) For plates with ultrasonic inspection requirements, "ultrasonic inspection and inspection level" should be indicated; h) Other special requirements; i) This standard number. A.2.3 For plates with thickness ≤23.00mm, if 0.4W≤a≤0.6W, the maximum stress intensity factor of the final stage of fatigue pre-crack ≤0.8KQ, KQ meets other validity criteria in GB/T 4161, but does not meet the sample size and (or) Fmax/FQ≤1.1 requirements, The test result can be used for result judgment. A.2.4 Others shall be implemented in accordance with the provisions of GB/T 4161. A.3 Test report The test report should include at least the following. a) Number of this standard; b) Lot number; c) grade; d) Supply status; e) test conditions; f) Test duration; g) test results; h) Tester, reviewer, test date. A.4 Other Others should meet the requirements of GB/T 4161. B.2 Test environment Unless otherwise specified, the air temperature of the test environment is maintained at 27°C ± 1°C during the entire test. The relative humidity should be controlled at 45%±10%. B.3 Test procedure The test stress and test time should meet the requirements of Table 15, and the others shall be implemented in accordance with the requirements of GB/T 22640-2008. B.4 Evaluation of results B.4.1 Naked vision or low-power inspection, the test results are expressed as "broken" or "unbroken". B.4.2 When there are obvious cracks, cracks, or breaks in the sample after the test, the sample is evaluated as "broken". The sample after the test has no obvious cracks, However, when pitting corrosion occurs and the pitting corrosion is linear, and its length is greater than or equal to 3mm, a metallographic inspection is required. The inspection results are determined as follows. a) When it is found that there is intergranular corrosion and transgranular cracks, the sample is evaluated as "broken"; b) When the width of intergranular corrosion is greater than the depth of intergranular corrosion, the sample is evaluated as "broken"; c) When the compressive stress surface intergranular corrosion depth is greater than the tensile stress surface intergranular corrosion depth, the sample is evaluated as "broken". B.5 Test report The test report should include at least the following. a) Number of this standard; b) Lot number; c) grade; d) Supply status; e) test conditions; f) Test duration; g) test results; h) Tester, reviewer, test date. B.6 Other Others should meet the requirements of GB/T 22640-2008.

Appendix C

(Normative appendix) Spalling corrosion sensitivity test method C.1 Reagents Add HNO3 to the test solution before the sample is immersed. Others shall be implemented in accordance with GB/T 22639-2008. C.2 Sample C.2.1 The selection of the test surface should meet the requirements of Table 18, the roughness of the test surface Ra is not more than 2.5μm, and the others should be in accordance with GB/T 22639- The.2008 regulations are implemented. C.2.2 The number of samples is not less than 3.If the sample size is insufficient or not standardized, it can be increased appropriately under the premise of meeting the appropriate test surface area Or reduce the number of samples, and the others shall be implemented in accordance with GB/T 22639-2008. C.3 Test environment The test device should be equipped with ventilation facilities, and the ambient temperature should not be higher than the test temperature (when it is higher than the test temperature, the cooling device is allowed Implementation), and the relative humidity should be controlled at 45% ± 10%, and other regulations in accordance with GB/T 22639-2008. C.4 Evaluation of results C.4.1 After the sample immersion test is completed, the gray samples in a wet state should be subjected to a preliminary assessment of the corrosion level one by one. early Rinse the sample with water after the evaluation, then soak it in a nitric acid solution for 30s and dry it to visually test the corrosion degree of the sample. When surface erosion is suspected, it should be Perform metallographic inspection and compare the results of metallographic inspection with Figure C.1, Figure C.3 ~ Figure C.7. C.4.2 Evaluate the corrosion grade of the sample according to Table C.1, and take the corrosion grade of the most severely corroded sample as the final test result. If the degree of corrosion When it is between two levels, it is assessed as the next level. C.4.3 Others shall be implemented in accordance with GB/T 22639-2008. Table C.1 Corrosion grade and degree of corrosion Corrosion grade Corrosion degree N Corrosion is not serious. There is micro-corrosion or discoloration on the surface, but there is no sign of pitting or denudation, as shown in Figure C.2 Pitting or discontinuous spots appear on the surface. At the edge of the point, there is a phenomenon of cracking and slight lifting (indicating that the corrosion has slightly penetrated into the sample Surface), as shown in Figure C.1 and Figure C.3 Exfoliation corrosion occurred. The appearance is markedly stratified, with blisters, lobes, small flakes, and granular particles produced after completely continuous flakes are broken. Granules, as shown in Figure C.4~Figure C.7.Subdivided into 4 grades according to the degree of corrosion, as shown in Table C.2.

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