GB/T 24187-2023 PDF English
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| GB/T 24187-2023 | English | 260 |
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Cold-drawn precision single welded steel tubes
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| GB/T 24187-2009 | English | 150 |
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Cold-drawn precision single welded steel tubes
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GB/T 24187-2023: Cold-drawn precision single welded steel tubes---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT24187-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 24187-2009
Cold-drawn precision single welded steel tubes
Issued on. AUGUST 06, 2023
Implemented on. MARCH 01, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 7
4 Classification and code... 7
5 Ordering content... 8
6 Size, shape, weight and allowable deviation... 8
7 Technical requirements... 12
8 Test methods... 15
9 Inspection rules... 17
10 Packaging, marking and quality certificate... 18
Annex A (normative) Bell mouth test of automobile steel tube... 19
Annex B (normative) Requirements and test methods for the inner surface of high-
cleanliness steel tubes for refrigeration... 21
Annex C (normative) Requirements and test methods for external coating and cladding
of steel tubes... 22
Annex D (normative) Inspection methods for residues... 25
1 Scope
This document specifies the classification and code, size, shape, weight and allowable
deviation, technical requirements, test methods, inspection rules, packaging, marking
and quality certificate of cold-drawn precision single welded steel tubes.
This document is applicable to cold-drawn precision single welded steel tubes
(hereinafter referred to as "steel tubes") used for the manufacture of condensers,
evaporators, fuel pipes, lubricating oil pipes, electric heating pipes, cooler pipes and
general piping in industries such as refrigeration, automobiles, and electric heating
appliances.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 222, Permissible tolerances for chemical composition of steel products
GB/T 223.5, Steel and iron -- Determination of acid-soluble silicon and total silicon
content -- Reduced molybdosilicate spectrophotometric method
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 223.63, Iron, steel and alloy - Determination of manganese content - Sodium
(potassium) periodate spectrophotometric method
GB/T 223.85, Steel and iron -- Determination of sulfur content -- Infrared absorption
method after combustion in an induction furnace
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 30062
apply.
4 Classification and code
4.1 Dimensional accuracy
Steel tubes are classified and coded according to dimensional accuracy as follows.
4.2 Mechanical properties
Steel tubes are classified and coded according to mechanical properties as follows.
4.3 Surface conditions
The classification and code of steel tubes according to surface conditions are shown in
Table 1.
6 Size, shape, weight and allowable deviation
6.1 Outside diameter and wall thickness
6.1.1 The nominal outer diameter (D), nominal wall thickness (S) and theoretical weight
of uncoated steel tubes shall comply with the requirements of Table 2.Steel tubes with
dimensions other than those specified in Table 2 may be supplied upon request of the
purchaser and after negotiation between the purchaser and the supplier.
6.1.2 The allowable deviation of the outer diameter of uncoated steel tubes shall comply
with the provisions of Table 3.
6.2 Length
6.2.1 The usual length of steel tubes is 1.5 m~4000 m. Steel tubes with a length of no
more than 8 m are delivered in strips. Steel tubes with a length of more than 8 m are
delivered in coils.
6.4 Weight
6.4.1 Coiled steel tubes are delivered by actual weight. Strip-shaped steel tubes are
delivered by actual weight, or by theoretical weight of number of pieces or without
coating.
6.4.2 The theoretical weight of uncoated steel tubes shall comply with the requirements
of Table 2 or be calculated according to formula (1).
6.4.3 For steel tubes delivered according to theoretical weight, the allowable deviation
between the actual weight and the theoretical weight of each batch shall be ±7.5%.
6.5 Marking examples
The marking sequence of steel tubes is. (dimensional accuracy) - dimensional
specifications - mechanical properties (category) - surface type and coating post-
treatment - this document number.
7 Technical requirements
7.1 Steel strip requirements
7.1.1 The steel strip used to manufacture steel tubes shall be cold-rolled low-carbon
steel strip or cold-rolled ultra-low-carbon steel strip. The chemical composition
(melting analysis) of the steel strip shall comply with the requirements of Table 6.
Table 6 -- Chemical composition of steel strip
7.2 Manufacturing methods
Steel tubes shall be manufactured by forming steel strips, welding longitudinal seams,
cold drawing and heat treatment. Steel tubes may be manufactured by other methods
after consultation between the supplier and the purchaser and specified in the contract.
7.3 Mechanical properties
The room temperature longitudinal mechanical properties of the steel tube shall comply
with the requirements of Table 7.
7.4 Process performance
7.4.1 Flattening
The steel tube shall be subjected to a flattening test. The length of the specimen is 50
mm~100 mm. During the test, the weld shall be located at 90° to the direction of force
application. Use a pressure plate to flatten the specimen at a uniform speed until the
inner wall fits. After the test, the specimen shall not have cracks, splits or weld cracks.
7.5 Hydraulic test
Automobile steel tubes shall be subjected to hydraulic pressure test. The test pressure
is calculated according to formula (2). Under the test pressure, the pressure stabilization
7.6 Airtightness
The disc-shaped steel tube shall be subjected to underwater air tightness test or active
gas air tightness test. For underwater air tightness test, the test pressure shall be not less
than 1.8 MPa. The pressure stabilization time shall be not less than 3 min. The steel
tube shall not have gas leakage. For active gas air tightness test, the active gas test
pressure shall be not less than 0.5 MPa. The pressure stabilization time shall be not less
than 10 min. The steel tube shall not have gas leakage.
7.9 Internal surface cleanliness
7.9.1 Steel tubes shall be inspected for internal surface cleanliness residues. The
residues shall not exceed 160 mg/m2.
7.9.2 Based on the purchaser’s requirements, after consultation between the supplier
and the purchaser and specified in the contract, the high cleanliness of the inner surface
of high-cleanliness steel tubes for refrigeration shall comply with the provisions of
Annex B.
7.10 Surface coating and cladding
7.10.1 The surface conditions of different types of steel tubes shall comply with the
provisions of Table 1.According to the requirements of the purchaser, steel tubes with
surface conditions other than those in Table 1 may be supplied after consultation
between the purchaser and the supplier.
8 Test methods
8.1 The chemical composition of the steel tube shall be subject to the quality certificate
of the steel strip manufacturer. The sampling for chemical composition analysis shall
comply with the provisions of GB/T 20066.
8.3 The surface of the steel tube is to be visually inspected piece by piece (coil) under
adequate lighting conditions.
8.4 The supplier shall select one of the following methods for the air tightness test of
the steel tube.
8.6 The sampling method and test method of steel tube inspection items shall comply
with the provisions of Table 9.
9 Inspection rules
9.1 Inspection classification
The inspection of steel tubes is divided into exit-factory inspection and type inspection.
9.2 Exit-factory inspection
The exit-factory inspection and acceptance of steel tubes shall be carried out by the
supplier's quality and technical supervision department. The exit-factory inspection
items shall comply with the provisions of Table 9.
9.3 Type inspection
When any of the following situations occurs, type inspection shall be carried out. Type
inspection items shall comply with the provisions of Table 9.
9.4 Batching rules
Steel tubes shall be inspected and accepted in batches. Each batch shall consist of steel
tubes of the same steel strip category, the same mechanical property category, the same
specification, and the same surface condition. The weight of each batch of steel tubes
shall not exceed 10,000 kg.
9.5 Sampling quantity
The sampling quantity for each inspection of steel tubes shall comply with the
provisions of Table 9.
9.6 Reinspection and judgment rules
10 Packaging, marking and quality certificate
10.1 Strip steel tubes shall be bundled. Wrap them with moisture-proof paper, vapor-
phase rust-proof paper or plastic film and then bundle them with protective packaging
materials such as plastic woven belts and non-woven fabrics.
10.4 Special packaging methods are determined by negotiation between the supplier
and the purchaser.
10.5 The marking and quality certificate of steel tubes shall comply with the provisions
of GB/T 2102.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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