GB/T 18248-2021 PDF English
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| GB/T 18248-2021 | English | 260 |
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Seamless steel tubes for gas cylinder
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| GB 18248-2008 | English | 150 |
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[GB/T 18248-2008] Seamless steel tubes for gas cylinder
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| GB 18248-2000 | English | 319 |
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Seamless steel tubes for gas cylinder
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GB/T 18248-2021: Seamless steel tubes for gas cylinder---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/GBT18248-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 18248-2008
Seamless steel tubes for gas cylinder
Issued on. AUGUST 20, 2021
Implemented on. MARCH 01, 2022
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 Symbols... 7
5 Order content... 7
6 Size, shape, weight and allowable deviation... 8
7 Technical requirements... 11
8 Test methods... 14
9 Inspection rules... 15
10 Packaging, marking and quality certificate... 16
Appendix A (Informative) Other designations and chemical compositions... 17
Appendix B (Informative) Reference values for mechanical properties option I... 18
Appendix C (Informative) Reference values for mechanical properties option II... 20
1 Scope
This document specifies the order content, size, shape, weight and allowable deviation,
technical requirements, test methods, inspection rules, packaging, marking and quality
certificate of seamless steel tubes for gas cylinder.
This document applies to seamless steel tubes for the manufacture of gas cylinders and
accumulator shells (hereinafter referred to as steel tubes).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
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 223.9, Iron, steel and alloy - Determination of aluminium content - Chrome
azurol S photometric method
GB/T 223.11, Iron, steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method
GB/T 223.12, Methods for chemical analysis of iron, steel and alloy - The sodium
carbonate separation-diphenyl carbazide photometric method for the determination
of chromium content
3 Terms and definitions
Terms and definitions defined in GB/T 222 and GB/T 30062 apply to this document.
4 Symbols
The following symbols apply to this document.
5 Order content
A contract or order for ordering steel tubes under this document shall include, but not
be limited to, the following.
6 Size, shape, weight and allowable deviation
6.1 Outside diameter and wall thickness
6.1.1 Unless otherwise specified in the contract, the steel tubes shall be delivered
according to the nominal outer diameter (D) and nominal wall thickness (S). According
to the requirements of the buyer, after negotiation between the supplier and the buyer,
the steel tubes can be delivered according to the nominal outer diameter and the
minimum wall thickness (Smin).
6.1.4 Unless otherwise specified in the contract, the allowable deviation of the wall
thickness of the steel tubes shall comply with the provisions of ordinary grade PA.
6.1.5 According to the requirements of the buyer, if it is negotiated between the buyer
and the supplier AND indicated in the contract, steel tubes of the dimensional allowable
deviation other than those that are specified in Tables 1 and 2 may be supplied.
6.2 Length
6.2.1 Normal length
The normal length of the steel tube is 4 000 mm ~ 12 000 mm. After it is negotiated
between the supplier and the buyer, and indicated in the contract, steel tubes with a
length greater than 12 000 mm or less than 4 000 mm but not less than 3 000 mm can
be delivered; the quantity of steel tubes with a length less than 4 000 mm shall not
exceed 5% of the total delivery of the batch of steel tubes.
6.2.2 Fixed length and multiple length
6.3 Curvature
6.3.1 The curvature per meter of the steel tube shall meet the following requirements.
6.3.2 The full-length curvature of the steel tube shall not exceed 0.15% of the length of
the steel tube.
6.4 Out-of-roundness and uneven wall thickness
According to the requirements of the buyer, if it is negotiated between the supplier and
the buyer, and indicated in the contract, the out-of-roundness and uneven wall thickness
of the steel tube shall not exceed 80% of the outer diameter allowance and wall
thickness allowance, respectively.
6.5 End shape
The end faces of the steel tube shall be perpendicular to the axis of the steel tube; the
burrs of the cut shall be removed.
6.6 Weight
7 Technical requirements
7.1 Steel designation and chemical composition
7.1.1 The steel designation and chemical composition (melting analysis) shall comply
with the requirements of Table 3.After negotiation between the supplier and the buyer,
the order can be placed as per other designations and chemical compositions in
Appendix A.
7.2 Manufacturing method
7.2.1 Smelting method of steels
The steel shall be refined outside the furnace with an electric arc furnace and processed
by vacuum refining, OR refined outside the furnace with an oxygen converter and
processed by vacuum refining.
7.4 Mechanical properties
7.4.1 The supplier shall select one option from the following three options of
mechanical properties to provide mechanical properties for reference.
7.4.2 Unless otherwise specified in the contract, the supplier shall provide reference
values of mechanical properties by means of mechanical properties option I.
7.5 Compactness
7.7 Surface quality
7.7.1 There shall be no visible cracks, folds, breaks, delamination and scars on the inner
and outer surfaces of the steel tubes. These defects shall be completely removed; the
depth of removal shall not exceed 10% of the wall thickness; the actual wall thickness
of the cleaned part shall not be less than the minimum allowable wall thickness; the
removal part shall have a smooth transition.
7.7.2 The depth of the straight on the inner and outer surfaces of the steel tube shall
meet the following requirements.
7.7.3 Other local imperfections where the depth does not exceed the lower deviation of
the wall thickness are allowed.
7.8 Non-destructive testing
7.8.1 When the electromagnetic testing method is used to test the compactness, the steel
tubes shall be subjected to ultrasonic testing one by one. When the hydraulic testing is
used to test the compactness, the steel tubes shall be subjected to ultrasonic testing or
magnetic flux leakage testing one by one.
7.8.4 When the steel tubes are delivered as per the minimum wall thickness, the groove
depth of the control tube for the non-destructive testing shall be calculated according to
the average wall thickness of the steel tube.
8 Test methods
8.1 Sampling for chemical composition analysis of steel tubes shall comply with the
rules of GB/T 20066.Chemical composition analysis usually abides by the provisions
of GB/T 4336, GB/T 20123 or other general methods; arbitration shall comply with the
provisions of GB/T 223.5, GB/T 223.9, GB/T 223.11, GB/T 223.12, GB/T 223.14,
8.2 The size and shape of the steel tubes shall be measured one by one by gauges that
meet the accuracy requirements.
8.3 The inner and outer surfaces of the steel tubes shall be inspected visually under full
lighting conditions.
9 Inspection rules
9.1 Inspection and acceptance
The inspection and acceptance of steel tubes shall be carried out by the supplier's quality
and technical supervision department.
9.2 Batch rules
9.3 Sampling quantity
The sampling quantity for each inspection of each batch of steel tubs shall meet the
requirements of Table 5.
9.4 Re-inspection and determination rules
The re-inspection and determination rules 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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