GB/T 24187-2023_English: PDF (GB/T24187-2023)
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| Standard ID | GB/T 24187-2023 (GB/T24187-2023) | | Description (Translated English) | Cold-drawn precision single welded steel tubes | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 18,116 | | Date of Issue | 2023-08-06 | | Date of Implementation | 2024-03-01 | | Older Standard (superseded by this standard) | GB/T 24187-2009 | | Drafting Organization | Zhejiang Kangsheng Co., Ltd., Changzhou Wujin Shunda Precision Steel Pipe Co., Ltd., Qingdao Juhong Precision Steel Pipe Co., Ltd., Zhangjiagang Yongbang Pipe Industry Co., Ltd., Qingdao Haier Intelligent Technology R&D Co., Ltd., Guangdong Sanxun Precision Technology Co., Ltd., Hangzhou Beyond Pipe Industry Co., Ltd., Zhejiang Kangshengke Industry and Trade Co., Ltd., Yangzhou Kairuide Machinery Equipment Technology Co., Ltd., Jiangsu Zhirun Pipe Industry Co., Ltd., Metallurgical Industry Information Standards Research Institute | | Administrative Organization | National Steel Standardization Technical Committee (SAC/TC 183) | | Proposing organization | China Iron and Steel Industry Association | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 24187-2009 (GB/T24187-2009) | | Description (Translated English) | Cold-drawn precision single welded steel tubes | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 14,197 | | Date of Issue | 2009-06-25 | | Date of Implementation | 2010-04-01 | | Quoted Standard | GB/T 222; GB/T 223.3; GB/T 223.58; GB/T 223.59; GB/T 223.61; GB/T 223.62; GB/T 223.63; GB/T 223.64; GB/T 223.67; GB/T 223.68; GB/T 223.72; GB/T 223.74; GB/T 223.79; GB/T 228-2002; GB/T 241; GB/T 242; GB/T 244; GB/T 246; GB/T 2102; GB/T 4336; GB/T 10125; GB/T 11605; GB/T 16488; GB/T 20066; GB/T 20123; GB/T 20126 | | Drafting Organization | Sing Pipe Co., Ltd. Zhejiang | | Administrative Organization | National Steel Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2009 No.9 (Total No.149) | | Proposing organization | China Iron and Steel Association | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the classification of cold drawn precision steel tubes and welded single code, dimensions, shape, test methods, , weight and tolerance, technical requirements for inspection rules, packaging, marking and quality certification. This standard applies to refrigeration, cars, electric appliances and other industries for the production of condensers, evaporator, fuel pipe, oil pipe, electric tube, cooler tube and general piping cold drawn precision steel tubes welded monolayer (hereinafter " pipe "). |
GB/T 24187-2023. Cold drawn precision single-layer welded steel pipe
ICS 77.140.75
CCSH48
National Standards of People's Republic of China
Replace GB/T 24187-2009
Cold drawn precision single layer welded steel pipe
Published on 2023-08-06
2024-03-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
PrefaceⅠ
1 range 1
2 Normative reference documents 1
3 Terms and Definitions 2
4 Classification and code 2
5 Order content 2
6 Dimensions, appearance, weight and allowable deviations 3
7 Technical requirements 5
8 Test method 7
9 Inspection rules 8
10 Packaging, marking and quality certificates9
Appendix A (Normative) Bell mouth test of steel pipes for automobiles 10
Appendix B (normative) Internal surface requirements and test methods for high-cleanliness steel pipes for refrigeration 12
Appendix C (Normative) Requirements and test methods for outer coating and cladding of steel pipes 13
Appendix D (Normative) Residue Test Method 15
Preface
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces GB/T 24187-2009 "Cold drawn precision single-layer welded steel pipe". Compared with GB/T 24187-2009, except for structural adjustment
In addition to comprehensive and editorial changes, the main technical changes are as follows.
a) Added types of surface conditions of steel pipes (see 4.3);
b) Dimensional accuracy has been deleted from the ordering content (see Chapter 4 of the.2009 edition);
c) The allowable deviation of the outer diameter has been changed, and the allowable deviation of the outer diameter has been increased and the delivery requirements are based on ordinary accuracy (see 6.1.2, 5.1.2 of the.2009 edition);
d) Changed the wall thickness allowable deviation (see 6.1.3, 5.1.3 of the.2009 edition);
e) The mechanical property requirements of steel strips are deleted (see 6.1.2 of the.2009 edition);
f) Changed the requirements for the manufacturing method of steel pipes (see 7.2, 6.2 of the.2009 edition);
g) The mechanical property requirements of steel pipes have been changed (see 7.3, 6.3 of the.2009 edition);
h) The requirements for the expansion test have been changed (see 7.4.2, 6.4.2 of the.2009 edition);
i) The air tightness test requirements have been changed (see 7.6, 6.6 of the.2009 edition);
j) The nitrogen sealing pressure has been changed (see 7.7, 6.7 of the.2009 edition);
k) Changed the surface quality requirements and added surface requirements for HPPP and HPPA steel pipes (see 7.8, 6.8 of the.2009 edition);
l) The sampling methods and test methods of inspection items have been changed (see 8.6, 7.6 of the.2009 version);
m) Added inspection classification and type inspection rules (see 9.1 and 9.3);
n) Delete the appearance judgment rules for the 90° area of the bell mouth test (see A.3 of the.2009 edition);
o) Change Appendix B and Appendix C from informational to normative (see Appendix B and Appendix C, Appendix B and Appendix C of the.2009 version);
p) Added outer cladding method (see C.1.2);
q) The corrosion resistance requirements of the cladding layer and the corrosion resistance time of steel pipes for refrigeration have been changed (see C.2.1, C.2.1 of the.2009 edition);
r) Added special requirements for HPPP and HPPA steel pipe cladding (see C.4);
s) The type of test solvent for internal surface cleanliness residues has been changed (see D.2.1, D.2.1 of the.2009 edition).
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed by the China Iron and Steel Industry Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This document was drafted by. Zhejiang Kangsheng Co., Ltd., Changzhou Wujin Shunda Precision Steel Pipe Co., Ltd., Qingdao Juhong Precision Steel Pipe
Co., Ltd., Zhangjiagang Yongbang Pipe Industry Co., Ltd., Qingdao Haier Intelligent Technology R&D Co., Ltd., Guangdong Sanxun Precision Technology Co., Ltd., Hangzhou
Zhou Chaoyue Pipe Industry Co., Ltd., Zhejiang Kangshengke Industry and Trade Co., Ltd., Yangzhou Kairuide Machinery Equipment Technology Co., Ltd., Jiangsu Zhirun Pipe Industry Co., Ltd.
Co., Ltd., Metallurgical Industry Information Standards Research Institute.
The main drafters of this document. Zhang Guoliang, Wang Huiliang, Peng Bingju, Yong Peihao, Li Baoping, Liu Faxian, Chen Fuxiang, Teng Shizheng, Gu Renfa,
Ge Qiangzhi, Zhan Lihua, Zhang Xiaowei, Li Zhiyu, Ling Qijin, Jiang Zhousheng, Yu Zhanshui, Zhu Jinmiao, He Liu, Zhu Aiqin, Zhang Hongchun, Li Qi.
This document was first published in.2009 and this is the first revision.
Cold drawn precision single layer welded steel pipe
1 Scope
This document specifies the classification and code, size, shape, weight and allowable deviation, technical requirements, and testing of cold drawn precision single-layer welded steel pipes.
Methods, inspection rules, packaging, marking and quality certificates.
This document is suitable for manufacturing condensers, evaporators, fuel pipes, lubricating oil pipes, electric heating pipes, etc. in industries such as refrigeration, automobiles, electric heating appliances, etc.
Cold-drawn precision single-layer welded steel pipes (hereinafter referred to as "steel pipes") for cooler pipes and general piping.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
GB/T 222 Allowable deviations in chemical composition of finished steel products
GB/T 223.5 Determination of acid-soluble silicon and total silicon content in iron and steel Reduced silicomolybdate spectrophotometry
GB/T 223.59 Determination of phosphorus content in steel and alloys bismuth phosphorus molybdenum blue spectrophotometry and antimony phosphorus molybdenum blue spectrophotometry
GB/T 223.63 Determination of manganese content in steel and alloys - Sodium (potassium) periodate spectrophotometry
GB/T 223.85 Determination of sulfur content in steel and alloys - Infrared absorption method after combustion in induction furnace
GB/T 223.86 Determination of total carbon content of steel and alloys - Infrared absorption method after combustion in induction furnace
GB/T 228.1-2021 Tensile testing of metallic materials Part 1.Room temperature test method
GB/T 241 Hydraulic test method for metal pipes
GB/T 242 Metal pipe expansion test method
GB/T 244 Bending test method for metal tubes
GB/T 246 Flattening test method for metal tubes
GB/T 2102 Acceptance, packaging, marking and quality certificate of steel pipes
GB/T 2423.22 Environmental testing Part 2.Test method Test N. Temperature change
GB/T 2975 Sampling location and sample preparation for mechanical property testing of steel and steel products
GB/T 4336 Determination of multi-element content in carbon steel and medium-low alloy steel Spark discharge atomic emission spectrometry (conventional method)
GB/T 7141 Plastic thermal aging test method
GB/T 10125 Artificial atmosphere corrosion test salt spray test
GB/T 11547 Determination of the resistance of plastics to liquid chemical reagents
GB/T 11605 Humidity measurement method
GB/T 16422.3 Plastic laboratory light source exposure test methods Part 3.Fluorescent UV lamp
GB/T 20066 Methods for sampling and preparation of samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content in steel and iron by high-frequency induction furnace post-combustion infrared absorption method (conventional method)
GB/T 20126 Determination of low carbon content of non-alloy steel Part 2.Infrared absorption method after combustion in induction furnace (preheated)
GB/T 30062 Steel Pipe Terminology
HJ637 Determination of water quality petroleum, animal and vegetable oils by infrared spectrophotometry
......
GB/T 24187-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Cold-drawn precision single welded steel tubes
ISSUED ON. JUNE 25, 2009
IMPLEMENTED ON. APRIL 01, 2010
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification and code ... 6
4 Ordering content ... 7
5 Dimensions, shape, weight and tolerance ... 7
6 Technical requirements ... 10
7 Test methods ... 14
8 Inspection rules ... 15
9 Packaging, marking and quality certificate ... 16
Appendix A (Normative) Bell-mouth test of steel tubes for automotive ... 17
Appendix B (Informative) Requirements for the inner surface of high-cleanliness
steel tubes for refrigeration ... 19
Appendix C (Informative) Steel tube’s outer plating requirements ... 21
Appendix D (Normative) Test method for residues of internal surface
cleanliness ... 23
Cold-drawn precision single welded steel tubes
1 Scope
This standard specifies the classification and code, dimension, shape, weight
and allowable deviation, technical requirements, test methods, inspection rules,
packaging, marking and quality certificates of cold-drawn precision single
welded steel tubes.
This standard is applicable to the cold-drawn precision single welded steel
tubes which are used in the manufacture of condensers, evaporators, fuel pipes,
lubricating oil pipes, electric heating pipes, cooler pipes and general pipe fittings
in such industries as refrigeration, automotive, electric heating and so on
(hereinafter referred to as “steel tube”).
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this standard;
however, parties who reach an agreement based on this standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of steels and alloys - The
diantipyryl methane phosphomolybdate gravimetric method for the
determination of phosphorus content by
GB/T 223.58 Methods for chemical analysis of steels and alloys - The
sodium arsenite-sodium nitrite titration method for the determination of
manganese content
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content -
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.61 Methods for chemical analysis of iron, steel and alloy - The
ammonium phosphomolybdate volumetric method for the determination of
phosphorus content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The
butyl acetate extraction photometric method for the determination of
phosphorus content
GB/T 223.63 Methods for chemical analysis of steels and alloys - The
sodium periodate for the determination of manganese content
GB/T 223.64 Iron, Steel and alloy - Determination of manganese content -
Flame atomic absorption spectrometric method
GB/T 223.67 Iron, steel and alloy - Determination of sulfur content -
Methylene blue spectrophotometric method
GB/T 223.68 Methods for chemical analysis of iron steel and alloy - The
combustion potassium iodate volumetric method for the determination of
sulfur content
GB/T 223.72 Methods for chemical analysis of iron, steel and alloy - The
alumina chromatographic separation-barium sulfate gravimetric method for
the determination of sulfur content
GB/T 223.74 Methods for chemical analysis of iron, steel and alloy - The
combustion gravimetric/gas-volumetric method for the determination of
combined carbon content
GB/T 223.79 Iron and steel - Determination of multi-element contents - X-
ray fluorescence spectrometry (Routine method)
GB/T 228-2002 Metallic materials – Tensile testing at ambient temperature
(eqv ISO 6892.1998)
GB/T 241 Metal materials - Tubes - Hydrostatic pressure test
GB/T 242 Metal materials - Tube - Drift-expending test (GB/T 242-2007, ISO
8493.1998, IDT)
GB/T 244 Metallic materials - Tube - Bend test (GB/T 244-2008, ISO
8491.1998, IDT)
GB/T 246 Metal materials - Tube - Flattening test (GB/T 246-2007, ISO
8492.1998, IDT)
GB/T 2102 Acceptance packing marking and quality certification of steel tube
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low-alloy steel (Routine method)
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests (GB/T
10125-1997, eqv ISO 9227.1990)
GB/T 11605 Methods of humidity measurement
GB/T 16488 Water quality - Determination of petroleum oil, animal and
vegetable oils - Infrared photometric method
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition (GB/T 20066-2006, ISO 14284.1996,
IDT)
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method) (GB/T 20123-2006, ISO 15350.2000, IDT)
GB/T 20126 Unalloyed steel - Determination of low carbon content - Part 2.
Infrared absorption method after combustion in an induction furnace (with
preheating) (GB/T 20126-2006, ISO 15349-2.1999, IDT)
3 Classification and code
3.1 Dimensional accuracy
a) Ordinary accuracy, codenamed PA;
b) Advanced accuracy, codenamed PC.
3.2 Mechanical properties
a) Ordinary steel tube, codenamed MA;
b) Soft steel tube, codenamed MB.
3.3 Surface status
The surface status and code of the steel tube are shown in Table 1. According
to the requirements of the purchaser, through negotiation between the supplier
and the purchaser, it may supply the steel tubes of other surface status than
those listed in Table 1.
Where.
W - The theoretical weight per meter of steel tube, in kilograms per meter
(kg/m);
D - The outer diameter of steel tube, in millimeters (mm);
S - The wall thickness of steel tube, in millimeters (mm).
5.4.3 For steel tubes delivered according to theoretical weight, the allowable
deviation of the actual weight of each batch from the theoretical weight shall be
± 7.5%.
5.5 Example of marking
Marking order. dimensional accuracy - specification dimension - mechanical
properties - surface type and plating post-treatment - standard number
Example 1. The soft cold drawn precision single welded steel tubes which are
copper-plated for the use of coil cooling, in ordinary accuracy, outer diameter
4.76 mm, wall thickness 0.50 mm, is marked as follows.
PA-4.76 x 0.50-MB-Cu-GB/T 24187
Example 2. The ordinary cold drawn precision single welded steel tubes which
are passivated into strip-shaped fixed length for automotive use, in advanced
accuracy, outer diameter 8.00 mm, wall thickness 0.70 mm, length 6000 mm,
outer surface galvanized layer thickness in 8 μm, is marked as follows.
PC-8.00 x 0.70 x 6000-MA-Zn 8 D-GB/T 24187
6 Technical requirements
6.1 Cold-rolled steel strip
6.1.1 Chemical composition of steel strip
6.1.1.1 For cold-rolled steel strips for steel tubes, it may use cold-rolled low-
carbon steel strips or cold-rolled ultra-low carbon steel strips. The chemical
composition (melting analysis) of steel strips shall comply with the requirements
of Table 6.
The steel tube for automotive shall be hydraulically tested. The test pressure is
calculated according to formula (2).
Where.
P - Test pressure, in Megapascal (MPa);
S - The wall thickness of steel tube, in millimeters (mm);
R - The allowable stress, the value of which is 140 MPa;
D - The outer diameter of steel tube, in millimeters (mm).
Under the test pressure, the voltage regulating time shall be not less than 5 s,
it is not allowed for the steel tube to crack or leak.
6.6 Airtightness
The steel tube shall be subjected to airtightness test one by one. The
airtightness test pressure shall be not less than 1.6 MPa, the pressure
regulating time shall be not less than 3 minutes, it is not allowed for the steel
tube to have air leakage.
6.7 Nitrogen-filled seal
According to the requirements of the purchaser, through negotiation between
the supplier and the purchaser, and as indicated in the contract, the coiled steel
tube can be filled with nitrogen gas at a pressure of not less than 0.2 MPa, then
both ends are sealed. The filled gas at the sealing part shall not leak.
6.8 Surface quality
6.8.1 The inner and outer surfaces of steel tubes shall be clean, smooth, free
of rust and stains, it shall not allow cracks, crusting, delamination, lap welding,
etc., which are harmful to the use.
6.8.2 The surface of uncoated steel tubes shall be bright and free of black spots;
for coated steel tubes, the coating shall be uniform, complete and firmly bonded.
6.8.3 The surface of the steel tube is allowed to have scratches and scribes
which have a length of not more than 50 mm and a depth not exceeding the
negative deviation of the wall thickness.
6.8.4 The burrs on the outer surface of the welded steel tube shall be removed,
the convex height of the inner surface of the weld shall not exceed 0.20 mm.
6.8.5 For the steel tubes which are hot galvanized, the surfaces are allowed to
have local rough surfaces, zinc beads or dark spots.
6.9 Inner surface cleanliness
6.9.1 The residue on the inner surface of the steel tube shall not exceed 0.16
g/m2.
6.9.2 The requirements for the inner surface of high-purity steel tubes for
refrigeration use shall be determined through negotiation between the supplier
and the purchaser, or by reference to Appendix B.
6.10 Surface coating
6.10.1 The types, status and markings of the surface coating of steel tubes are
as shown in Table 1.
6.10.2 The requirements for the coating of the outer surface of the steel tube
shall be determined through negotiation between the supplier and the
purchaser, or by reference to Appendix C.
7 Test methods
7.1 The size and shape of the steel tube shall be measured one by one by the
gage which meets the accuracy requirements, the wall thickness shall be
measured to avoid the weld.
7.2 The surface of the steel tube shall be visually inspected one by one under
full lighting conditions.
7.3 The chemical composition and mechanical properties of the steel strip shall
be based on the quality certificate of the steel strip manufacturer. When the
supplier and the purchaser agree that re-inspection or arbitration is required,
the test method of chemical composition for steel tubes shall comply with the
requirements of Table 10.
7.4 The airtightness test of steel tubes is selected by the supplier from the
following ways.
a) Connect one end of the steel tube to the barometer, lead in dry gas from
the other end. After reaching to the specified pressure, cut off the gas
source, stabilize the pressure to the specified time, check whether the
pressure in the steel tube is reduced. When performing this test, it shall
ensure the sealing at the joint at the steel tube ends.
b) Lead in dry gas into the steel tube. After reaching to the specified pressure,
place the steel tube below water. Within the specified time, it shall not
produce air bubbles due to gas leakage in the steel tube.
Appendix B
(Informative)
Requirements for the inner surface of high-cleanliness steel tubes for
refrigeration
B.1 Moisture content
B.1.1 Requirements
The moisture content of the inner surface of the steel tube shall not exceed 30
mg/m2.
B.1.2 Test methods
The test of the moisture content of the inner surface of the steel tube shall
comply with the provisions of the electrolysis method of GB/T 11605. Through
negotiation between the supplier and the purchaser, it may also use the
moisture analyzer of the electrolysis method. The uncertainty of the instrument
measurement shall be no more than 5%. The preparation of specimen and test
methods shall be as specified in the instrument manual.
B.2 Residue content
B.2.1 Requirements
The residue on the inner surface of the steel tube shall be not more than 30
mg/m2.
B.2.2 Test methods
See Appendix D for the test method for the residues on the inner surface of
steel tubes. Through negotiation between the supplier and the purchaser, it may
also use other methods.
B.3 Oil content
B.3.1 Requirements
The oil content of the inner surface of the steel tube shall not exceed 10 mg/m2.
B.3.2 Test methods
The test of the oil content on the inner surface of the steel tube shall comply
with the provisions of GB/T 16488. Through negotiation between the supplier
and the purchaser, it may also use the oil analyzer of infrared spectroscopy.
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