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GB/T 26302-2020 English PDF (GBT26302-2020)

GB/T 26302-2020 English PDF (GBT26302-2020)

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GB/T 26302-2020: Seamless copper and copper alloy tube for heat pipe

This Standard specifies the classification and sign, technical requirements, test methods, inspection rules, markings, packaging, transportation, storage, quality certificates and purchase orders (or contracts) of seamless copper and copper alloy tubes for heat pipe.
GB/T 26302-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.150.30
H 62
Replacing GB/T 26302-2010
Seamless Copper and Copper Alloy Tube for Heat Pipe
ISSUED ON: SEPTEMBER 29, 2020
IMPLEMENTED ON: AUGUST 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Classification and Sign ... 8
5 Technical Requirements ... 10
6 Test Methods ... 16
7 Inspection Rules ... 17
8 Marking, Packaging, Transportation, Storage and Quality Certificate ... 21 9 Purchase Order (or Contract) Contents ... 22
Seamless Copper and Copper Alloy Tube for Heat Pipe
1 Scope
This Standard specifies the classification and sign, technical requirements, test methods, inspection rules, markings, packaging, transportation, storage, quality certificates and purchase orders (or contracts) of seamless copper and copper alloy tubes for heat pipe.
This Standard is applicable to the seamless copper and copper alloy round tubes (hereinafter referred to as tubes) used in the container of low and medium temperature heat pipe components for heat collection, heat transfer, and heat exchange. 2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this document.
GB/T 242 Metal Materials ?€? Tube ?€? Drift-Expanding Test
GB/T 246 Metallic Materials ?€? Tube ?€? Flattening Test
GB/T 351 Metallic Materials ?€? Resistivity Measurement Method
GB/T 2828.1 Sampling Procedures for Inspection by Attributes ?€? Part 1: Sampling Schemes Indexed Acceptance Quality Limit (AQL) for Lot-by-Lot Inspection GB/T 4340.1 Metallic Materials ?€? Vickers Hardness Test ?€? Part 1: Test Method GB/T 5121 (all parts) Methods for Chemical Analysis of Copper and Copper Alloys GB/T 5231 Designation and Chemical Composition of Wrought Copper and
Copper Alloys
GB/T 5248 Electromagnetic (Eddy-Current) Examination of Copper and Copper Alloy Seamless Tube
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and Judgement of Limiting Values
GB/T 8888 Wrought Heavy Non-Ferrous Metal Products-Packing, Marking,
Transporting, Storing and Quality Certificate
GB/T 14811-2008 Heat Pipe Terminology
GB/T 17791-2017 Seamless Copper and Copper Alloys Tube for Air Conditioner and Refrigeration Equipment
GB/T 23606-2009 Copper-Hydrogen Embrittlement Test Method
GB/T 26303.1 Measuring Method for Dimensions and Shapes of Wrought Copper and Copper Alloy - Part 1: Tube
GB/T 32791 Electromagnetic (Eddy-Current) Examination Method for Electrical Conductivity of Copper and Copper Alloys
GB/T 34505-2017 Copper and Copper Alloy Materials - Tensile Testing at Room Temperature
YS/T 347 Copper and Copper Alloys - Estimation of Average Grain Size
YS/T 482 Methods for Analysis of Copper and Copper Alloys - The Atomic
Emission Spectrometry
YS/T 483 Methods for Analysis of Copper and Copper Alloys - X-Ray
Fluorescence Spectrometric (Wavelength Dispersive)
YS/T 668 The Sampling Method of Physical and Chemical Testing for Copper and Copper Alloys
YS/T 815 Preparation Method of Test Pieces for Mechanical and Technological Properties of Copper and Copper Alloys
YS/T 999 Capillary Tube of Copper and Copper Alloy - Eddy Current Testing Method
3 Terms and Definitions
For the purpose of this document, the terms and definitions given in GB/T 14811-2008 and the following apply. For the benefit of use, some terms and definitions in GB/T 14811-2008 are listed repeatedly.
3.1 Heat pipe
The evaporating, condensing, and heat transfer device that drives the circulating flow of the working fluid with the suction effect of the capillary structure. Smooth-wall coiled tube GB/T 26302-TU0 O50-??6.00??0.50
Or smooth-wall coiled tube GB/T 26302-T10130 O50-??6.00??0.50
Example 3: The inner-grooved straight tube is signed by TU2 (T10180) manufacture, supply state of light draw (H55), outer diameter 8.00mm, bottom wall thickness 0.30mm, height of tooth 0.20mm, width of groove bottom 0.25mm, addendum angle 5??, helix angle 0??, the number of grooves 70, length 3500mm as follows:
Inner-grooved straight tube GB/T 26302-TU2 H55-8.00??0.30??0.20??0.25-5-0/70??3500 Or inner-grooved straight tube GB/T 26302-T10180 H55-8.00??0.30??0.20??0.25-5-0/70??3500 Example 4: The inner-grooved coiled tube is singed by TP1(C12000) manufacture, supply state of light annealing (O50), outer diameter 6.00mm, bottom wall thickness 0.25mm, height of tooth 0.20mm, width of groove bottom 0.16mm, addendum angle 5??, helix angle 2??, the number of grooves 50 as follows:
Inner-grooved coiled tube GB/T 26302-TP1 O50-6.00??0.25??0.20??0.16-5-2/50 Or inner-grooved coiled tube GB/T 26302-C12000 O50-6.00??0.25??0.20??0.16-5-2/50 5 Technical Requirements
5.1 Chemical composition
The chemical composition of the tube shall comply with the provisions of the corresponding designation specified in GB/T 5231.
5.2 Overall dimensions and allowable deviations
5.2.1 The dimensions of smooth-wall tubes and their allowable deviations The overall dimensions and allowable deviations of the smooth-wall tubes shall comply with the provisions of Tables 2 and 3.
6 Test Methods
6.1 Chemical composition
The chemical composition analysis of the tube shall be carried out in accordance with the provisions of GB/T 5121 (all parts) or YS/T 482, YS/T 483; and the arbitration shall be carried out in accordance with the provisions of GB/T 5121 (all parts). 6.2 Overall dimension and allowable deviation
The measurement methods for overall dimension and its allowable deviation of the tube shall be carried out in accordance with the provisions of GB/T 26303.1. 6.3 Mechanical properties
The tensile test of the tube is carried out in accordance with the provisions of GB/T 34505-2017; the tube with an outer diameter of no more than 30mm shall be carried out in accordance with the provisions of full-section specimens; and the tube with an outer diameter of more than 30mm~50mm shall be carried out in accordance with the provisions of S1 specimens specified in GB/T 34505-2017.
The Vickers hardness test of the tube shall be carried out in accordance with the provisions of GB/T 4340.1.
6.4 Process performance
The flaring test of the tube shall be carried out in accordance with the provisions of GB/T 242.
The flattening test of the tube shall be carried out in accordance with the provisions of GB/T 246.
6.5 Conductivity
The conductivity test of the tube shall be carried out in accordance with the provisions of GB/T 351 or GB/T 32791; and the arbitration shall be carried out in accordance with the provisions of GB/T 351.
6.6 Grain size
The grain size inspection of the tube shall be carried out in accordance with provisions of YS/T 347.
6.7 Hydrogen embrittlement test
The hydrogen embrittlement test of oxygen-free copper tube is carried out in accordance with the closed bending method (6.2) in GB/T 23606-2009; and the arbitration is carried out in accordance with the repeated bending method (6.3) in GB/T 23606, and the number of bending is no less than 6 times.
6.8 Eddy current flaw detection
The eddy current flaw detection method for tube with an outer diameter of no more than 3mm shall be carried out according to the provisions of YS/T 999; the eddy current flaw detection method for tube with an outer diameter of more than 3mm shall be carried out according to the provisions of GB/T 5248.
6.9 Residual oil
The inspection of residual oil content on the inner surface of tubes in the O50 state and O60 state shall be carried out in accordance with the provisions of Appendix B in GB/T 17791-2017.
6.10 Surface quality
The surface quality of the tube is inspected visually.
7 Inspection Rules
7.1 Inspection and acceptance
7.1.1 The tubes shall be inspected by the supplier?€?s technical supervision department to ensure that the product quality meets the requirements of this Standard and the contract (or purchase order); and fill in the quality certificate.
7.1.2 The purchaser shall inspect the received products in accordance with the provisions of this Standard. If the inspection result does not conform to the provisions of this Standard and the contract (or purchase order), it shall be submitted to the supplier in written form, and the supplier and the buyer shall resolve it through negotiation. Objections that belong to surface quality and dimensional deviations shall be raised within one month from the date of receipt of the product. Objections related to other properties shall be raised within three months from the date of receipt of the product. If arbitration is required, arbitration sampling shall be conducted jointly by both parties.
7.2 Batching
The tubes shall be submitted for acceptance in batches. Each batch shall be composed of tubes with the same brand, state and specification. The weight of each batch of tubes with an outer diameter of no more than 3mm shall be no more than 500kg; and the weight of each batch of tubes with an outer diameter of more than 3mm shall be 8 Marking, Packaging, Transportation, Storage and
Quality Certificate
8.1 Marking
8.1.1 Product marking
The following markings shall be marked on the labels of qualified tubes: a) Inspection seal of the supplier's technical supervision department;
b) Alloy designation;
c) specification;
d) Supply state;
e) Lot number;
f) production date;
g) The number of defects (coiled tube);
h) Net weight;
i) Implementation standards;
j) Others.
8.1.2 Packaging mark
The packaging box mark of the tube shall comply with the provisions of GB/T 8888. 8.2 Packaging, transportation, storage and quality certificate
8.2.1 The packaging, transportation, storage and quality certificate of the tubes shall comply with the provisions of GB/T 8888.
8.2.2 When there are special requirements for the packaging method, it shall be determined through negotiation between the supplier and the buyer.

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