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GB/T 33366-2016 PDF English


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GB/T 33366-2016: PDF in English (GBT 33366-2016)

GB/T 33366-2016 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.150.10 H 61 Wrought Aluminium Alloy Extruded Rods and Bars for Electron Enginery-tank ISSUED ON: DECEMBER 30, 2016 IMPLEMENTED ON: JULY 01, 2017 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of Contents Foreword ... 3  1 Scope ... 4  2 Normative references ... 4  3 Requirements ... 5  4 Test method ... 8  5 Test rules ... 10  6 Marking, packaging, transportation, storage and quality certificate ... 13  7 Order form (or contract) contents ... 14  Foreword This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by the China Nonferrous Metals Industry Association. This Standard shall be under the jurisdiction of National Technical Committee 243 on Nonferrous Metals of Standardization Administration of China (SAC/TC 243). The drafting organizations of this Standard: Southwest Aluminum (Group) Co., Ltd., China Nonferrous Metals Techno-Economic Research Institute, Guangdong Haomei Aluminum Co., Ltd., Liaoning Zhongwang Group Co., Ltd., Northeast Light Alloy Co., Ltd., National Nonferrous Metals Quality Supervision and Inspection Center, Shandong Yancon Light Alloy Co., Ltd., Fujian Nanping Aluminum Co., Ltd., Guangdong Huachang Aluminum Factory Co., Ltd. The drafters of this Standard: Wang Xiaogang, Peng Zhujun, Ge Lixin, Xiang Shengqian, Gai Hongtao, Wang Guojun, Li Pu, Wang Zhibo, Luo Taotao, Gao Xinyu, Chen Jingchun, Tang Xingyu. Wrought Aluminium Alloy Extruded Rods and Bars for Electron Enginery-tank 1 Scope This Standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage, quality certificate and order form (or contract) contents of wrought aluminium alloy extruded rods and bars for electron enginery-tank. This Standard applies to aluminum alloy extruded round bars (hereinafter referred to as bars) which are used for processing conductive parts in electronic equipment control cabinets. 2 Normative references The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 231.1, Metallic materials. Brinell hardness test. Part 1: Test method GB/T 3190, Wrought aluminum and aluminum alloy. Chemical composition GB/T 3199, Wrought aluminium and aluminium alloy products. Packing, marking, transporting and storing GB/T 3048.2, Test methods for electrical properties of electric cables and wires. Part 2: Test of electrical resistivity of metallic materials GB/T 3246.1, Inspection method for structure of wrought aluminum and aluminum alloy products. Part 1: Inspection method for microstructure GB/T 3246.2, Inspection method for structure of wrought aluminum and aluminum alloy products. Part 2: Inspection method for macrostructure GB/T 7999, Optical emission spectrometric analysis method of aluminum and aluminum alloys GB/T 8170, Rules of rounding off for numerical values & expression and judgment of limiting values GB/T 12966, The method for determining aluminum alloys conductivity using eddy current GB/T 16865, Test pieces and method for tensile test for wrought aluminium and magnesium alloys products GB/T 17432, Methods of sampling for analyzing the chemical composition of wrought aluminum and aluminum alloys GB/T 20975, Methods for chemical analysis of aluminium and aluminium alloys 3 Requirements 3.1 Product categories 3.1.1 Grade, status and dimensions Grade, status and diameter of the bars shall comply with the requirements of Table 1. Table 1 -- Grade, status and diameter Grade Status Diameter mm 6082 T6 30.0 ~ 350.0 3.1.2 Marking and examples Product markings are expressed in the order of product name, number of this Standard, grade, status and dimensions. Examples of markings are as follows: Example 1: The bar of grade 6082, status T6, diameter of 200.0 mm and random length, is marked as: Bar GB/T 33366-6082T6-ϕ200 Example 2: The bar of grade 6082, status T6, diameter of 200.0 mm and fixed length of 6000 mm, is marked as: Bar GB/T 33366-6082T6-ϕ200×6000 3.2 Chemical composition The chemical composition of the bar shall comply with the provisions of GB/T 3190. 3.3 Dimension deviation 3.3.1 Diameter The diameter deviation of the bar shall comply with the requirements of Table 2. Table 2 -- Diameter deviation In millimeters 3.3.2 Length For bars which are supplied with a fixed length, its length allowable deviation is +15 0 mm. For bars which are supplied with a double length, a 5-mm sawing allowance shall be added to each saw bite. 3.3.3 Cutting slope The end face of the bar shall be cut flat. For bars whose diameter is less than 50.0 mm, the cutting slope is not more than 5°; for bars whose diameter is not less than 50.0 mm, the cutting slope is not more than 3°. 3.3.4 Bending The bending of the bar shall comply with the requirements of Table 3. Table 3 -- Bending of the bar In millimeters Diameter Bending of the bar On a length of any 300 mm On the length of each meter 30.0 ~ 80.0 ≤ 0.6 ≤ 2.0 > 80.0 ~ 120.0 ≤ 1.0 ≤ 2.0 > 120.0 ~ 200.0 ≤ 1.5 ≤ 3.0 > 200.0 ~ 250.0 ≤ 2.0 ≤ 4.0 > 250.0 ~ 300.0 ≤ 3.0 - > 300.0 ~ 350.0 ≤ 4.0 - 3.4 Tensile mechanical properties at room temperature Diameter allowable deviation Diameter Positive deviation Negative deviation The longitudinal tensile mechanical properties at room temperature of the bar shall comply with the requirements of Table 4. For bars whose diameter exceeds the requirements that are specified in Table 4, their longitudinal tensile mechanical properties at room temperature shall be negotiated between the supplier and the buyer and be indicated in the order form (or contract). The measured results shall be attached when it is not indicated. Table 4 -- Tensile mechanical properties at room temperature Grade Status Diameter mm Tensile strength Rm MPa The specified non- proportional extension strength Rp0.2 MPa Elongation after break A Not less than 6082 T6 ≥ 30 ~ 150 310 260 8 > 150 ~ 200 280 240 6 > 200 ~ 250 270 200 6 3.5 Brinell hardness The Brinell hardness of the bar shall comply with the requirements of Table 5. For bars whose diameter exceeds the requirements that are specified in Table 5, the Brinell hardness shall be negotiated between the supplier and the buyer and be indicated in the order form (or contract). The measured results shall be attached when it is not indicated. Table 5 -- Brinell hardness Alloy Status Diameter mm Brinell hardness HBW 6082 T6 60 ~ 200 ≥ 95 3.6 Conductivity The conductivity of the 6082 alloy and T6 state shall comply with the requirements of Table 6. For bars whose specification exceeds that in Table 6, the conductivity shall be negotiated between the supplier and the buyer, and shall be indicated in the order form (or contract). If not specified, the measured results shall be attached. Table 6 -- Conductivity Alloy Status Diameter mm Conductivity MS/m 6082 T6 60 ~ 200 ≥ 26 3.7 Low-magnification organization 3.7.1 The oxide film on the low-magnification organization sample of the bar shall comply with the requirements of Table 7. Table 7 -- Oxide film Name of the defect Area under test Defect length per point ≤ 0.3 mm > 0.3 mm ~ 2.0 mm > 2.0 mm Oxide film Full cross-section Allowed to exist ≤ 4 points Not allowed to exist 3.7.2 The low-magnification organization sample of the bars are not allowed to have cracks, shrinkage tails, pores, bright grains, non-metallic inclusions, foreign metal inclusions, and spot defects such as white spots and primary crystals. 3.7.3 The layer depth on the low-magnification organization sample of the bar shall not exceed half the allowable negative deviation of the diameter of the bar. When unlayered bars are required, it shall be negotiated between the supplier and the buyer and indicated in the order form (or contract). 3.8 Microstructure The microstructure of the bar is not allowed to be overburnt. 3.9 Appearance quality 3.9.1 Cracks, bubbles or corrosive spots are not permitted on the surface of the bar. 3.9.2 The surface of the bar is allowed to have defects such as craters, scratches, bumps, scratches, oxidized colors, black and white spots and straightening marks that are not more than half the diameter negative deviation. 4 Test method 4.1 Chemical composition 4.1.1 The analysis method of chemical composition shall comply with requirements of GB/T 20975 or GB/T 7999; the arbitration analysis shall adopt the methods which are specified in GB/T 20975. 4.1.2 Perform routine chemical analysis only on the numerically specified elements other than those in the columns of the “Aluminum” and “Other” of grade-6082 in GB/T 3190. When the mass fraction of the non-routine analysis element is suspected to exceed the limit value of this Standard, the producer shall analyze these elements. 4.1.3 The “Al” content is calculated according to the method which is specified in GB/T 3190. When the “Al” content is calculated, take the sum value of the analytical values of the conventional analytical elements and the suspected excess unconventional analytical elements as the “sum of elemental content”. 4.1.4 The determination of analysis value is based on the rounding comparison method; the value rounding rules shall be carried out in accordance with the relevant provisions of GB/T 8170; the rounding digit shall be consistent with the limit digits which are specified in GB/T 3190. 4.2 Size inspection 4.2.1 Bending Place the bar on the platform; when it becomes stable by its dead weight, place a 300 mm (or 1 000 mm) long ruler (or knife ruler) against the surface of the bar along the length of the bar; measure the maximum gap value hs between the bar and the ruler (or knife ruler); then, hs is the bending of the length of every 300 mm (or every meter), as shown in Figure 1. 4.2.2 Bar diameter The diameter of the bar shall be measured with a gauge of not less than 0.02 mm. Figure 1 4.2.3 Length, cutting slope The length and cutting slope of the bar shall be measured with a measuring instrument of a corresponding precision or a special instrument. 4.3 Tensile mechanical properties at room temperature The test method of vertical tensile mechanical properties of the rod at room temperature shall be carried out in accordance with provisions of GB/T 16865. 4.4 Brinell hardness The Brinell hardness test method of the bars shall be carried out in accordance Platform with the provisions of GB/T 231.1. 4.5 Conductivity The conductivity test of the bars shall comply with the provisions of GB/T 12966 or GB/T 3048.2. The arbitration shall be performed in accordance with the provisions of GB/T 3048.2. 4.6 Low-magnification organization The test method of low-magnification organization of the bars shall comply with the provisions of GB/T 3246.2. 4.7 Microstructure The test method of microstructure of the bars shall comply with the provisions of GB/T 3246.1. 4.8 Appearance quality The surface quality of the bar shall be visually inspected; when the depth of the defect is difficult to determine, the grinding method can be used to measure. 5 Test rules 5.1 Inspection and acceptance 5.1.1 The product shall be inspected by the supplier to ensure that the product quality complies with the requirements of this Standard and the order form (or the contract); the supplier shall fill in the quality certificate. 5.1.2 The buyer shall inspect the received products in accordance with the provisions of this Standard. If the test result is inconsistent with the provisions of this Standard and the order form (or the contract), a written form shall be submitted to the supplier; the issue shall be settled by negotiation between the supplier and the buyer. Objections of appearance quality and dimensional deviation shall be filed within 1 month from the date of receipt of the product; objections of other performances shall be filed within 3 months from the date of receipt of the product. Arbitration, if required, may be carried out by an organization which is recognized by both the supplier and the buyer; the sampling shall be jointly done by the buyer. 5.2 Batch Bars shall be submitted for acceptance in batches. Each batch shall consist of tubes of the same grade, status and dimensions. 5.3 Weight The bars shall be weighed on the scales. 5.4 Inspection items Each batch of bars, before being delivered, shall be tested for chemical composition, dimensional deviation, mechanical property, Brinell hardness, conductivity, low-magnification organization, microstructure and appearance quality. 5.5 Sampling The sampling of the bars shall comply with the requirements of Table 8. Table 8 -- Sampling regulations Inspection items Sampling regulations Required article number Article number of the test method Chemical composition According to the provisions of GB/T 17432 3.2 4.1 Dimensional deviation The sampling amount is as specified in Table 9 3.3 4.2 Tensile mechanical properties at room temperature a The sampling quantity is as specified in Table 9. Cut one sample at the extrusion front end of each bar. 3.4 4.3 Brinell hardness a The sampling quantity is as specified in Table 9. Cut one sample at the extrusion front end of each bar. 3.5 4.4 Conductivity a The sampling amount is as specified in Table 9 3.6 4.5 Low-magnification organization The sampling quantity is as specified in Table 9. Cut one sample at the extrusion end of each bar. 3.7 4.6 Microstructure a The solution heat treatment furnace is cut at a high-temperature zone; the sampling quantity is 2 3.8 4.7 Appearance quality Test one by one 3.9 4.8 a For the tensile mechanical properties at room temperature, Brinell hardness, conductivity and microstructure of the bar, the manufacturing plant takes samples by heat treatment number and by batch during arbitration. Table 9 -- Sampling quantity 5.6 Determination of the test result 5.6.1 When the chemical composition of any sample is unqualified, if the melting order of the bar can be distinguished, judge the melting order that is represented by the sample as unqualified; inspect other melting orders in turn, and deliver the qualified ones. If the melting order cannot be distinguished, judge the batch as unqualified. 5.6.2 When the dimensional deviation of any sample is unqualified, judge the batch of bars as unqualified; however, it is allowed to inspect one by one, and deliver the qualified ones. 5.6.3 When the tensile mechanical properties at room temperature of any sample are unqualified, take double the number of samples from the batch (or heat treatment furnace) of bars to perform repeated tests; if the repeated test results are all qualified, judge the batch (or heat treatment furnace) of bars to be qualified. If the sample properties are still unqualified in the repeated test result, then, judge the batch (or heat treatment furnace) of bars to be unqualified. The supplier is allowed to inspect the products one by one and deliver those qualified ones. The supplier is also allowed to re-sample after another heat treatment to inspect the tensile mechanical properties at room temperature, Brinell hardness, conductivity and microstructure. 5.6.4 When the Brinell hardness of any sample is unqualified, take double the number of samples from the batch (or heat treatment furnace) of bars to perform repeated tests; if the repeated test results are all qualified, judge the batch (or heat treatment furnace) of bars to be qualified. If the sample properties are still unqualified in the repeated test result, then, judge the batch (or heat treatment furnace) of bars to be unqualified. The supplier is allowed to inspect the products one by one and deliver those qualified ones. The supplier is also allowed to re-sample after another heat treatment to inspect the tensile mechanical properties at room temperature, Brinell hardness, conductivity and microstructure. Number per batch or per furnace piece Sampling quantity piece 5.6.5 When the conductivity of any sample is unqualified, judge the batch (or heat treatment furnace) of bars as unqualified; however, it is allowed to inspect one by one, and deliver the qualified ones. The supplier is also allowed to re- sample after another heat treatment to inspect the tensile mechanical properties at room temperature, Brinell hardness, conductivity and microstructure. 5.6.6 When the low-magnification organization of any sample is unqualified, judge as follows: a) If it is unqualified because of metallurgical defects such as cracks, bright grains, non-metallic inclusions, foreign metal inclusions, white spots, primary crystals and oxide film, judge the batch of bars to be unqualified. b) If it is unqualified because of layering and shrinkage, it is allowed to cut a portion from the extrusion end of the bar for repeated test until it is qualified; then, other bars of the batch shall be tailed according to the maximum length of the above defect distribution of the tested bar OR inspected one by one; deliver the qualified ones. 5.6.7 When the microstructure of any sample is unqualified, judge the batch (or heat treatment furnace) of bars to be unqualified. 5.6.8 When the appearance quality of any sample is unqualified, judge the bar to be unqualified. However, it is allowed to cut the unqualified part for re- inspection and deliver the qualified ones. 6 Marking, packaging, transportation, storage and quality certificate 6.1 Marking 6.1.1 Product marking The following markings (or labels) shall be printed on the accepted bars: a) the inspection stamp of the supplier's quality inspection department (or the signature or stamp of the quality inspection personnel); b) grade, status and dimensions; c) bar batch number or date of manufacture. 6.1.2 Package marking The package marking of the bar shall comply with the provisions of GB/T 3199. 6.2 Packaging, transportation, storage The bars are not oiled and not packed; others are in accordance with the provisions of GB/T 3199. The packaging mode and method which needs oiling, packing or is different from GB/T 3199 shall be agreed upon by the supplier and the buyer, and shall be indicated in the order form (or contract). 6.3 Transportation and storage The transportation and storage of the tubes shall comply with the provisions of GB/T 3199. 6.4 Quality certificate Each batch of bars shall be accompanied by a product quality certificate, which indicates: a) the name of the supplier; b) product name: c) grade, status, dimensions; d) product batch number or date of manufacture; e) net weight or number of pieces; f) various of analysis and test results; g) the inspection stamp of the supplier's quality inspection department; h) code of this Standard; i) Date of packaging (or date of manufacture). 7 Order form (or contract) contents The order form (or contract) that orders the materials which are listed in this Standard shall include the following: a) product name; b) grade, status, dimensions; c) weight (or number of pieces); d) special requirements of mechanical properties of the bars whose diameter exceeds that in Table 4; e) special requirements of Brinell hardness of the bars whose diameter exceeds that in Table 4; f) special requirements of conductivity of the bars whose diameter exceeds that in Table 4; g) special requirements of layering; h) special requirements of packaging; i) other special requirements; j) number of this standard. __________ END __________ ......
 
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