This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of copper and copper alloy heat dissipation flat tubes. This standard applies to copper and copper alloy heat dissipation flat tubes used in tanks, automobiles, locomotives, tractors and power machinery radiators. GB/T 8891-2000 Copper and copper alloy heat dissipation flat tubes GB/T8891-2000 Standard download decompression password: www.bzxz.net

GB/T8891-2000
This standard is a revision of GB/T8891--1988 "Copper and Copper Alloy Radiating Flat Tubes", mainly referring to IOCT2936:1975 "Seamless Flat Tubes for Radiators" (No. 1 Amendment on March 3, 1984 modified the original text). The main changes in this revision are as follows:
1) Added H85 and HSn70-1 brand radiating flat tubes. 2) H85 radiating flat tubes are semi-hard (Y.) and residual stress is eliminated; HSn70-1 radiating flat tubes are soft (M). 3) The pipe specification series is expanded from 16~22mm in width to 16~~25mm, and the height is expanded from 2.2~6mm to 1.9~~6mm. The length is expanded from 250~1380mm to 250~1500mm. 4) The dimensional accuracy of the pipe has been improved accordingly, and a high-precision grade has been added to the general grade. 5) The air pressure of the air tightness test has been increased from 0.06~~0.2MPa to 0.4MPa, and the duration has been increased from 30~~60s to 60. Appendix A of this standard is a reminder appendix.
This standard will replace GB/T8891-1988 from the date of implementation. This standard is proposed by the State Bureau of Nonferrous Metals Industry. This standard is under the jurisdiction of the China Nonferrous Metals Industry Standard Metrology and Quality Research Institute. The drafting unit of this standard: Shanghai Zhongxin Copper Tube Industry Co., Ltd. The main drafters of this standard: Qian Qiao, Jiang Chunrong, Ke Guanglong, Xu Chaoyang. 532
National Standard of the People's Republic of China
Flat tube of copper and copper alloy for heat radiator
Flat tube of copper and copper alloy for heat radiatorGB/T 8891-- 2000
Replaces GB/T 8891--1988
This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of copper and copper alloy flat tubes for heat radiator (hereinafter referred to as materials).
This standard applies to copper and steel alloy flat tubes for heat radiator used in tanks, automobiles, locomotives, tractors and power machinery. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 2281987
Metal tensile testing methods
GB/T 5121—1996
Chemical analysis methods for copper and copper alloys
GB/T 5231---1985
Processed copper--Chemical composition and product shape
GB/T 5232—1985
GB/T 6397-- 1986
GB/T 8888 --1988
GB/T 10567--1997
3 Requirements
3.1 Product classification
3.1.1 Brand, state and specification
Processed brass - Chemical composition and product shape Metal tensile test specimen
Packaging, marking, transportation and storage of heavy non-ferrous metal processed products Residual stress test method for processed copper and copper alloy materials The brand, state and specification of the pipe shall comply with the provisions of Table 1. Table 1
Brand, state and specification of pipes
T2, H96
HSn70-1
Supply state
Hard (Y)
Semi-hard (Y2)
Soft (M)
Note: Pipes of other brands and specifications can be supplied upon negotiation between the two parties. 3.1.2 Marking examples
Width × height × wall thickness
(16 ~25)X(1.9~6.0)X (0.2 ~0. 7) Length
250~1500
H96 made of hard higher-grade pipe with a width of 22mm, a height of 4mm and a wall thickness of 0.25mm is marked as: flat tube H96Y high precision 22×4X0.25GB/T8891-2000 Made of T2 with a width of 18.5mm, a height of 2.5mm and a wall thickness of 0.25mm, the hard ordinary-grade pipe is marked as: flat tube T2Y18.5X2.5X0.25, GB/T8891-2000 State Quality and Technical Supervision Bureau approved on June 9, 2000 and implemented on November 1, 2001
3.2 Chemical composition
GB/T 8891—2000
The chemical composition of the pipe shall comply with the requirements of the corresponding grades in GB/T5231 and GB/T5232. 3.3 Dimensions and allowable deviations of pipes
3.3.1 The cross-sectional shape of the pipe is shown in Figure 1 below, and its dimensions shall comply with the requirements in Table 2. R1/2B
Schematic diagram of cross section of pipe
Table 2 Dimensions of pipe
Note: “)\” indicates product, “
—” indicates no product
The allowable deviation of pipe dimensions shall comply with the provisions of Table 3.0.30
Wall thickness S
Table 3 Allowable deviation of pipe dimensions
Width A
Allowable deviation
Ordinary grade
High precision grade
Height B
Allowable deviation
Ordinary grade
Note: Pipes with other specifications and allowable deviations can be supplied through negotiation between the two partiesHigh precision grade
Wall thickness S
>0. 20~0. 30
≥0. 03~0. 50
≥0. 50~0. 70
3.3.3 The end of the pipe should be sawn flat and free of burrs. The inclination of the cut should not exceed the length tolerance 53-1
Tolerance
Ordinary grade
High precision grade
GB/T 8891
The length and tolerance of the pipe should comply with the provisions of Table 4. 3.3.4
Table 4 Length and tolerance of pipe
Delivery length of pipe
≥400~-1 000
>1 000～1 500
The curvature of the pipe shall comply with the provisions of Table 5. Ordinary grade
Allowable deviation
Curvature of pipewww.bzxz.net
Curvature
Pipe length
>400～600
>600～1000
1000～1500
Ordinary grade
Positive direction (A)
High precision grade
The twist of the pipe shall comply with the provisions of Table 6
Pipe length
>400～600
≥600～1 000
>1 000～1 500
Mechanical properties
Twist degree of pipe
Not more than
Not more than
Ordinary grade
Twist degree
Ordinary grade
The longitudinal room temperature tensile test results of pipes shall comply with the provisions of Table 7 Table 7 Mechanical properties
T2, H96
HSn70-1
Air tightness test
Tensile strength, MPa
Not less than
Not more than
High precision grade
Lateral (B)
High precision grade
Elongation%
High precision grade
Not less than
When the pipe is subjected to air pressure test, the air pressure is 0.1MPa, the pipe is completely immersed in water for 60s, and no bubbles should appear in the pipe. 3.6 Residual stress
Hard brass pipes should be annealed to eliminate residual stress. If the party who needs it has special requirements and indicates it in the contract, residual stress inspection can be carried out.
Surface quality
3.7.1 The inner and outer surfaces of the pipe should be smooth and clean, and there should be no cracks, pinholes, peeling, bubbles, inclusions and green rust. 335
GB/T8891—2000
3.7.2 Pipes are allowed to have slight, localized scratches, pits, spots and other defects that do not cause the shape and wall thickness of the pipe to exceed the allowable deviation. Slight, localized water marks and dark colors are not used as a basis for scrapping. 4 Test methods
4.1 The arbitration analysis method for the chemical composition of pipes shall be carried out in accordance with the provisions of GB/T5121. 4.2 The longitudinal room temperature tensile test of pipes shall be carried out in accordance with the provisions of GB/T228, and the tensile test specimens shall comply with the provisions of GB/T6397. 4.3 The air tightness test method of pipes shall be carried out in accordance with the following provisions: When testing pipes, they should be connected to a pressurized gas source to keep air with a certain pressure in the pipe. Put the pipe completely into water and check whether there is any gas leakage in the pipe. 4.4 The residual stress test of the pipe shall be carried out in accordance with the provisions of GB/T10567. 4.5 The surface quality of the pipe shall be checked with the naked eye.
4.6 The outer dimensions of the pipe shall be measured with measuring tools of corresponding accuracy. When measuring the wall thickness, the two ends of the pipe shall be cut 100mm long in the longitudinal direction. The bending of the pipe shall be measured with a ruler (or steel tape measure) and a feeler gauge. 4.7
4.8 When measuring the distortion of the pipe, the wide surface of the pipe shall be placed flat on the platform board, with the three corners as a plane, and then the gap distance between one of the four corners and the platform shall be measured with a feeler gauge. 5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The pipes shall be inspected by the supplier's technical supervision department to ensure that the product quality complies with the provisions of this standard and fill in the quality assurance certificate. 5.1.2 The buyer shall inspect the received products in accordance with the provisions of this standard. If the inspection results do not comply with the provisions of this standard, the buyer shall submit the matter to the supplier within three months from the date of receipt of the product and the supplier and buyer shall negotiate to resolve the issue. 5.2 Batches
Pipes shall be submitted for inspection in batches. Each batch shall consist of pipes of the same brand, state and specification. The weight of each batch shall not exceed 500kg. 5.3 Inspection items
5.3.1 Each batch of pipes shall be inspected for chemical composition, mechanical properties, external dimensions and surface quality. 5.3.2 When the buyer requires, the pipes shall be subjected to air tightness test and residual stress test of hardened brass pipes. 5.4 Sampling location and number of samples
5.4.1 For sampling of chemical composition, the supplier shall take a sample from each furnace during melting and casting, and the buyer shall randomly take a sample from each batch of pipes. 5.4.2 For longitudinal room temperature mechanical property test and residual stress test of pipes, two pipes shall be randomly selected from each batch. 5.4.3 For the sampling number of air tightness test, the supplier and the buyer shall agree on it. 5.4.4 For surface quality inspection, 1% of the weight of each batch shall be sampled for inspection. When the weight is less than 100kg, at least 20 pipes shall be sampled for inspection. 5.4.5 For the external dimensions inspection of pipes, no less than 20 pipes shall be sampled for each batch. 5.5 Repeated test
Even if only one sample fails to meet the test results of mechanical properties, residual stress test, surface quality and external dimensions of pipes, double samples shall be taken from the batch for re-inspection of the unqualified items. If one sample still fails to meet the test results of the re-inspection, the whole batch shall be unqualified or tested pipe by pipe. The qualified ones shall be accepted as a separate batch. 5.6 Determination of test results
When the chemical composition, mechanical properties and residual stress are unqualified, the whole batch is unqualified; when the airtightness test, surface quality and external dimensions are unqualified, the single piece is unqualified.
6 Marking, packaging, transportation and storage
6.1 Marking
On each batch of pipes that pass the inspection, there are at least two labels as follows:536
a) Inspection stamp of the technical supervision department of the manufacturer;
b) Brand;
{) Supply status;
d) Batch number
6.2 Packaging, transportation and storage
GB/T 8891—2000
The packaging, transportation and storage of pipes shall comply with the provisions of GB/T8888. 6.3 Quality Assurance
Each batch of pipes shall be accompanied by a product quality assurance certificate. Indicate: a) Manufacturer name; b) Product name; c) Brand; d) Specification; c) Status; d) Batch number; g) Net weight and number of pieces; h) Results of various analyses and tests and stamp of the technical supervision department; d) Number of this standard; i) Packing date.
Contents of order
The order for materials listed in this standard shall include the following: 7.1 Material name.
7.2 Brand.
7.3 Status.
7.4 Specification and accuracy grade,
Weight or number of pieces.
Allowable deviation of dimension (when there are special requirements). 7.6
7.7 Residual stress test.
7.8 Air tightness test.
7.9 Standard number.
7.10 Others.
GB/T88912000
Appendix A
(Suggested Appendix)
Calculation of theoretical weight
A1 In order to calculate the theoretical weight of the pipe, the theoretical density of various specifications of copper and steel alloys listed in the previous standards is collected and the values ​​in Table A1 are taken. Table Al Density
HSn70-1
A2 The theoretical weight of the pipe is: cross-sectional area of ​​the pipe × length × density. Flat pipe cross-sectional area element [R (RS) \] 2 (4R
density, g/em
B) X S110 Others.
GB/T88912000
Appendix A
(Suggested Appendix)
Calculation of theoretical weight
A1 In order to calculate the theoretical weight of the pipe, the theoretical density of various specifications of copper and steel alloys listed in the previous standards is collected and the values ​​in Table A1 are taken. Table Al Density
HSn70-1
A2 The theoretical weight of the pipe is: the cross-sectional area of ​​the pipe × length × density. Flat pipe cross-sectional area element [R (RS) \] 2 (4R
density, g/em
B) X S110 Others.
GB/T88912000
Appendix A
(Suggested Appendix)
Calculation of theoretical weight
A1 In order to calculate the theoretical weight of the pipe, the theoretical density of various specifications of copper and steel alloys listed in the previous standards is collected and the values ​​in Table A1 are taken. Table Al Density
HSn70-1
A2 The theoretical weight of the pipe is: the cross-sectional area of ​​the pipe × length × density. Flat pipe cross-sectional area element [R (RS) \] 2 (4R
density, g/em
B) X S1
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