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GB/T 26291-2020 English PDF

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GB/T 26291-2020: Seamless copper-nickel alloys tube for ships
Status: Valid

GB/T 26291: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 26291-2020English279 Add to Cart 3 days [Need to translate] Seamless copper-nickel alloys tube for ships Valid GB/T 26291-2020
GB/T 26291-2010English399 Add to Cart 3 days [Need to translate] Copper-nickel seamless pipe for ships Obsolete GB/T 26291-2010

PDF similar to GB/T 26291-2020


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Basic data

Standard ID GB/T 26291-2020 (GB/T26291-2020)
Description (Translated English) Seamless copper-nickel alloys tube for ships
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H62
Classification of International Standard 77.150.30
Word Count Estimation 15,164
Date of Issue 2020-09-29
Date of Implementation 2021-08-01
Older Standard (superseded by this standard) GB/T 26291-2010
Regulation (derived from) National Standard Announcement No. 20 of 2020
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 26291-2020: Seamless copper-nickel alloys tube for ships

---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.
Seamless copper-nickel alloys tube for ships ICS 77.150.30 H62 National Standards of People's Republic of China Replace GB/T 26291-2010 Copper-nickel alloy seamless pipe for ships 2020-09-29 released 2021-08-01 implementation 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 26291-2010 "Copper-nickel alloy seamless pipes for ships". Compared with GB/T 26291-2010, the main technology The changes are as follows. ---Modified the alloy grade and state representation method (see Table 1, Table 1 of the.2010 edition); ---The terms and definitions of nominal size (DN) have been added (see 3.1); ---Added the type of pipe "coiled tube" (see Table 1, Table 1 of the.2010 edition); ---The Y2 status is deleted, and only the O60 status is retained (see Table 1 in the.2010 edition); ---Modified the specifications of the pipe, the outer diameter was changed from 8mm~458mm to 4mm~458mm, and the wall thickness was changed from 0.6mm~12.0mm Change to 0.4mm~12.7mm, and change the length from ≤8000mm to ≤15000mm (see Table 1, Table 1 of the.2010 edition); ---Modified the nominal size, from "70mm" to "65mm" (see Table 3, Table 3 of the.2010 edition); ---Modified the allowable deviation of wall thickness, the allowable deviation of the average wall thickness of pipes with a nominal outer diameter greater than 159mm is determined by "±12.5%" is revised to "±12% of the nominal wall thickness" (see Table 4,.2010 edition of 3.3.3); ---The straightness requirement is revised, from "each meter should not be greater than 2mm" to the regulation of classification according to the nominal outer diameter (see Table 6,.2010 edition 3.3.5); ---Increase the Vickers hardness requirements in the mechanical properties, modify the tensile strength and BFe30-1-1 elongation index after breaking (see Table 8,.2010 Edition of Table 6); ---Modified the process performance and revised the two-way bending test to the two-way bending test (see 5.4.3, 3.5.3 of the.2010 edition); ---Added electrochemical corrosion performance requirements (see 5.7); ---Increase the test method of electrochemical corrosion performance of copper alloy seamless pipe (see Appendix A). 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. Zhejiang Hailiang Co., Ltd., Jiangyin Hehong Precision Technology Co., Ltd., Wuxi Longda Metal Materials Co., Ltd. Company, Shaoxing Shangyu Golden Eagle Copper Co., Ltd., Jiangsu Cuilong Precision Copper Tube Co., Ltd., Jinlong Copper Tube Group Henan Longhui Copper Co., Ltd. Company, Zhejiang Metallurgical Product Quality Inspection Station Co., Ltd., Jiangxi Province Copper and Copper Product Quality Supervision and Inspection Center, Shandong Zhongjia Electronic Technology Co., Ltd., Changshu Zhongjia New Material Co., Ltd. The main drafters of this standard. Zhao Xuelong, Kong Shuilong, Yang Lijun, Wen Jiyou, Wei Lianyun, Zhou Xiangdong, Liang Xingqiang, Lu Minghua, Zhang Chunming, Bai Kunya, Zhang Xinliang, Zhao Qinhai, Li Baojin, Hu Tianming, Sun Lijin, Jin Liwen, Zhang Yongjing, Sun Xiongfei, Bao Jiafeng. The previous versions of the standard replaced by this standard are as follows. ---GB/T 26291-2010. Copper-nickel alloy seamless pipe for ships

1 Scope

This standard specifies the classification and marking, technical requirements, test methods, inspection rules, marking, packaging, and transportation of copper-nickel alloy seamless pipes for ships. Import, storage, quality certificate and purchase order (or contract) content. This standard applies to copper-nickel alloy seamless pipes (hereinafter referred to as pipes) for marine engineering pipeline systems such as ship manufacturing.

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 241 Metal pipe hydraulic test method GB/T 242 Metal pipe flaring test method GB/T 246 Test method for flattening of metallic material pipes GB/T 2828.1 Sampling inspection procedure by attributes Part 1.Batch inspection sampling plan retrieved by acceptance quality limit (AQL) GB/T 3375-1994 welding terminology GB/T 4340.1 Vickers hardness test for metallic materials Part 1.Test method GB/T 5121 (all parts) Methods for chemical analysis of copper and copper alloys GB/T 5231 Processed copper and copper alloy grades and chemical composition GB/T 5248 Copper and copper alloy seamless pipe eddy current testing method GB/T 8170 Numerical rounding rules and the expression and determination of limit values GB/T 8888 Packaging, marking, transportation, storage and quality certificate of heavy non-ferrous metal processing products GB/T 26303.1 Copper and copper alloy processing material outline dimension test method Part 1.Pipe GB/T 34505-2017 Room temperature tensile test method for copper and copper alloy materials YS/T 347 Copper and copper alloy average grain size determination method YS/T 482 Copper and copper alloy analysis method photoelectric emission spectrometry YS/T 483 Copper and copper alloy analysis method X-ray fluorescence spectrometry (wavelength dispersion type) YS/T 668 Copper and copper alloy physical and chemical testing sampling method Preparation method of YS/T 815 copper and copper alloy mechanical properties and process performance samples

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Nominalsize The size identification of a combination of letters and numbers used for piping system components consists of the letter DN followed by a dimensionless integer number. Note 1.This dimensionless number is directly related to the characteristic dimensions such as the aperture or outer diameter (in mm) of the end connector. Note 2.Unless otherwise specified in the relevant standards, the dimensionless numbers following DN do not represent measured values and should not be used in calculations. [GB/T 1047-2019, definition 2.1] 5.4 Process performance 5.4.1 Flaring test Tubes with an outer diameter of not more than 108mm can be flared test. During the test, the top core angle is 45°, and the expansion rate is not less than 30%. There should be no visible cracks or damage to the rear pipe. 5.4.2 Flattening test The pipe should be subjected to a flattening test. During the test, it should be flattened until the distance between the two walls is equal to the wall thickness. After the test, there should be no visible cracks or damaged. 5.4.3 Two-way bending test Pipes with an outer diameter greater than 108mm should be subjected to a two-way bending test. During the test, both ends of the sample should be bent 180°, and there should be no appearance after bending. Cracks or breakage visible to the naked eye. 5.5 Grain size The average grain size of the pipe is 0.010mm~0.045mm. 5.6 Non-destructive test 5.6.1 Eddy current flaw detection For pipes with an outer diameter of not more than 160mm, eddy current testing shall be carried out. When the pipe is inspected by eddy current testing, the signal of the eddy current testing equipment Straight pipes that do not send out an alarm signal on the device shall be regarded as pipes that meet this standard. The coil should be printed at the defect position not less than 300mm long For the dark mark, the allowable number of defects is determined by the supplier and the buyer through negotiation. The standard artificial defect should be a through hole, and its drill diameter should comply with GB/T 5248 Provisions. 5.6.2 Water pressure test The maximum working pressure of the pipe is calculated according to formula (1). When the pipe is subjected to hydraulic test, the test pressure is calculated according to formula (2). The maximum test pressure does not exceed 6.9MPa, under this pressure, continuous After 10s~15s, the pipe should be free of leakage and permanent deformation. P= 2S·t D-0.8t (1) Where. P---Maximum working pressure, in megapascals (MPa); S---Material allowable stress, in megapascals (MPa). At room temperature, take the corresponding grade and state Rp0.2 minimum value in Table 8 50% of; t---The nominal wall thickness of the pipe, in millimeters (mm); D---The nominal outer diameter of the pipe, in millimeters (mm). Pt=n·P (2) Where. Pt---test pressure, in megapascals (MPa); n---safety factor, usually 1.50~1.65; P---Maximum working pressure, in megapascals (MPa). 5.7 Electrochemical corrosion performance The pipe can be tested for electrochemical corrosion performance, and the potential difference between the inside and outside of the pipe is ΔE≤0.07V. 5.8 Surface quality The inner and outer surfaces of the pipe should be smooth and clean, and there should be no defects that affect the use.

6 Test method

6.1 Chemical composition The analysis of the chemical composition of the pipe shall be carried out in accordance with the provisions of GB/T 5121 or YS/T 482, YS/T 483, and the arbitration shall be carried out in accordance with GB/T 5121 Regulations proceed. 6.2 Dimensions and allowable deviation The external dimensions of the pipe and its allowable deviation are measured in accordance with the provisions of GB/T 26303.1. 6.3 Mechanical properties The room temperature mechanical performance test of the pipe is carried out according to the regulations of GB/T 34505-2017, and the hardness test is carried out according to the regulations of GB/T 4340.1 get on. The types of tensile specimens are shown in Table 9, and the specific requirements should meet the requirements of Table 13 in GB/T 34505-2017. 6.4 Process performance 6.4.1 The flaring test of the pipe shall be carried out in accordance with the provisions of GB/T 242. 6.4.2 The flattening test of the pipe shall be carried out according to the provisions of GB/T 246. 6.4.3 The two-way bending test of the pipe shall be carried out according to the following regulations. Take a longitudinal arc sample along the center of the pipe, the length is not less than 300mm, and the wall thickness is the original wall thickness of the pipe. The two ends are bent 180° in opposite directions, as shown in Figure 1 after bending. Figure 1 Schematic diagram of two-way bending test 6.5 Grain size The inspection of grain size shall be carried out in accordance with the provisions of YS/T 347. 6.6 Non-destructive test 6.6.1 The eddy current flaw detection of pipes shall be carried out in accordance with the provisions of GB/T 5248. 6.6.2 The hydraulic test of the pipe shall be carried out in accordance with the provisions of GB/T 241. 6.7 Electrochemical corrosion performance Refer to Appendix A for the electrochemical corrosion performance test of the pipe. 6.8 Surface quality The surface quality of the pipe shall be inspected visually.

7 Inspection rules

7.1 Inspection and acceptance 7.1.1 The pipe material shall be inspected by the supplier’s technical supervision department to ensure that the product quality meets the requirements of this standard, and fill in the material quality assurance certificate. 7.1.2 The purchaser shall inspect the received products in accordance with the provisions of this standard, and the inspection results are not consistent with the provisions of this standard and the contract (or purchase order). It should be submitted to the supplier in written form, and the supplier and demander shall negotiate and resolve. The objection that belongs to the surface quality and dimensional deviation should be Submitted within one month from the date of the product. Objections to other properties should be raised within three months from the date of receipt of the product. If arbitration is required, This should be done jointly by both the supplier and the buyer. 7.2 Batch Pipes should be submitted for acceptance in batches, and each batch should be composed of pipes of the same brand, specification and condition. The weight of each batch does not exceed 5000kg. 7.3 Inspection items 7.3.1 Pipe inspection items shall be carried out in accordance with Table 10. 7.5 Judgment of inspection results 7.5.1 Numerical rounding and judgment of the test results shall be carried out in accordance with the provisions of GB/T 8170, and the rounding value comparison method shall be used for judgment. 7.5.2 When the chemical composition is unqualified, the batch of pipes shall be deemed unqualified. 7.5.3 When the outer dimensions of the pipe and its allowable deviation or the surface quality is unqualified, the root (or plate) is judged to be unqualified. Number of unqualified pieces in each batch If the quality limit is exceeded, the whole batch will be judged as unqualified, or the supplier will be inspected one by one (or plate), and the qualified will be delivered. 7.5.4 When there are unqualified samples in the test results of mechanical properties, process performance, grain size, and electrochemical corrosion, the batch of pipe materials (including acceptance Take another double number of samples from the unqualified pipe (or plate) to repeat the test. If all the repeated tests are qualified, the entire batch of pipes will be judged qualified. If the repeated test results still have unqualified samples, the entire batch of pipes shall be deemed unqualified, or the supplier shall inspect one by one (or plate), and the qualified delivery. 7.5.5 If the non-destructive test fails to pass the inspection, a single (or coil) pipe shall be deemed as unqualified. 7.5.6 When other defects occur, the batch of pipes shall be resolved through negotiation between the supplier and the buyer. 8 Marking, packaging, transportation, storage and quality certificate The marking, packaging, transportation, storage and quality certificate of the pipe shall meet the requirements of GB/T 8888. 9 Purchase order (or contract) content The order form (or contract) for the pipes listed in this standard should include the following. a) Product name; b) grade; c) Delivery status; d) Specifications; e) Quantity (weight or number of roots, number of meters); f) Mechanical properties (choose one of tensile test and hardness test); g) Non-destructive test (choose one of eddy current flaw detection or hydraulic test); h) Process performance (choose one of the flaring test, flattening test or two-way bending test); i) Electrochemical corrosion performance (when required); j) Number of this standard; k) Others.

Appendix A

(Informative appendix) Test method for electrochemical corrosion performance of copper alloy seamless pipe A.1 Method summary Fill the sample with potassium chloride (KCl) solution, use a potentiometer to measure the potential of the inner and outer surfaces of the pipe, and calculate the potential of the inner and outer surfaces of the pipe Poor, to determine the corrosion resistance of the pipe. A.2 Reagents Potassium chloride (KCl) solution. 0.02mol/L. A.3 Sample Intercept.200mm~300mm pipes from the samples to be tested, sand the outer wall of the pipes under circulating water with sandpaper to remove the oxide film (avoid The high temperature caused by friction oxidizes again). A.4 Instruments Potentiometer [reference input impedance. >1014Ω (parallel capacitance 1pF)]. A.5 Test procedure A.5.1 Sample cleaning Using absorbent cotton, combined with acetone, carefully wipe off the grease on the inner surface of the copper pipe until the inner wall is clean. A.5.2 Filling with potassium chloride (KCl) solution One end of the tube is sealed with rubber, placed upright with the opening facing upward, and the tube is filled with KCl solution. Reference electrode [saturated KCl solution Mercury chloride electrode (SCE)] is placed in the sample tube. Keep 10mm~20mm long pipes that are not wetted by the test liquid. A.5.3 Determination of the internal surface potential of the pipe (corrosion potential E1) When measuring the inner surface potential of the pipe, the pipe is connected to the positive electrode (red) of the voltmeter, and the reference electrode is connected to the negative electrode (black ground), which is stable 10min, wait for the metal corrosion potential to stabilize before measuring. A.5.4 Measurement of the external surface potential of the pipe (corrosion potential E2) When the external surface potential of the pipe is measured, the pipe and the reference electrode are both placed in a beaker containing 0.02mol/L KCl solution. A.6 Test data processing The potential difference ΔE between the inner and outer surfaces of the pipe is calculated by formula (A.1).

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