GB/T 5312-2025 (GB/T 5312-2009) PDF English
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| GB/T 5312-2025 | English | RFQ |
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Seamless steel tubes and pipes for ship
| Valid |
| GB/T 5312-2009 | English | 85 |
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Carbon and carbon-manganese steel seamless steel tubes and pipes for ship
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| GB/T 5312-1999 | English | 519 |
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Carbon and carbon--Manganese steel seamless steel tubes and pipes for ship
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| GB/T 5312-1985 | English | RFQ |
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Carbon steel seamless steel tubes for ship
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GB/T 5312-2009: Carbon and carbon-manganese steel seamless steel tubes and pipes for ship---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/GBT5312-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 5312-1999
Carbon and Carbon-manganese Steel Seamless
Steel Tubes and Pipes for Ship
Issued on. OCTOBER 30, 2009
Implemented on. MAY 1, 2010
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
1 Scope... 4
2 Normative References... 4
3 Classification and Code Number... 6
4 Ordering Information... 7
5 Dimension, Shape, Weight and Allowable Deviation... 7
6 Technical Requirements... 9
7 Inspection and Testing Methods... 13
8 Inspection Rules... 15
9 Packing, Marking and Quality Certificate... 15
Appendix A (Informative) Mechanical Properties under High Temperature of
Carbon and Carbon-manganese Steel Seamless Steel Tubes and Pipes for Ship
... 16
Foreword
This standard was revised by referring to the technical contents of seamless steel
tubes and pipes in "Rules for Material and Welding" (2006 edition) issued by the
China Classification Society (CCS).
This standard replaces GB/T 5312-1999 "Carbon and Carbon-manganese Steel
Seamless Steel Tubes and Pipes for Ship". There have been some significant
changes in this standard over GB/T 5312-1999 as follows.
- The ordering information was added;
- The marking samples were deleted;
- The external diameter allowable deviation of hot rolled (extruded) steel tubes and
pipes were modified;
- The allowable length deviation levels were added;
- The index for the straightness in full length was added;
- The content of sulfur and phosphorus was modified;
- The smelting process of steel was modified;
- The methods of bending test were modified;
- The Appendix A and B of original standard were cancelled.
Appendix A of this standard is informative.
This standard was proposed by China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Technical Committee on
Iron and Steel of Standardization Administration of China.
Drafting organization of this standard. Baoshan Iron & Steel Co., Ltd.
Participating drafting organizations of this standard. Panggang Group Chengdu Steel
& Iron Co., Ltd. and Jiangyin Jieda Shaped Tube Co., Ltd.
Chief drafting staffs of this standard. Luo Yuqing, Zhang Yaofei, Liu Cailing, Li Qi, Xue
Jianliang and Yang Fan.
The previous editions replaced by this standard are as follows.
- GB/T 5312-1985, GB/T 5312-1999.
Carbon and Carbon-manganese Steel Seamless
Steel Tubes and Pipes for Ship
1 Scope
This standard specifies the classification, code number, dimension, shape, weight,
technical requirements, testing method, inspection rules, packing, marking and quality
certificate of carbon and carbon-manganese steel seamless steel tubes and pipes for
ship (hereinafter referred to as steel tubes and pipes).
This standard is applicable to the carbon and carbon-manganese steel seamless
steel tubes and pipes used for Grade I and I pressure piping system, boilers and
super-heaters for manufacturing ships.
2 Normative References
The following standards contain the provisions which, through reference in this text,
constitute the provisions of this standard. For dated reference, the subsequent
modification or revisions of these publications do not apply. However, all parties who
reach an agreement according to this standard are encouraged to study whether the
latest edition of these documents is applicable. For undated references, the latest
edition of the normative document is applicable to this standard.
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 223.5-2008,
ISO 4829-1.1986, ISO 4829-2.1988, MOD)
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
GB/T 223.26 Iron Steel and Alloy-Determination of Molybdenum Content-The
Thiocyanate Spectrophotometric Method
GB/T 223.53 Methods for Chemical Analysis of Iron - Steel and Alloy -The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Nickel
Content
GB/T 223.54 Methods for Chemical Analysis of Iron - Steel and Alloy--The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Nickel
Content (GB/T 223.54-1987, eqv ISO/DIS 4940.1986)
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 Methods for Chemical Analysis of Iron - Steel and Alloy; The Sodium
(Potassium) Periodate Photometric Method for the Determination of Manganese
Content
GB/T 223.68 Methods for Chemical Analysis of Iron - Steel and Alloy The Potassium
Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of
Sulfur Content
3 Classification and Code Number
3.1 Steel tubes and pipes are classified into two categories according to the
manufacturing methods. The categories and code numbers are as follows.
3.2 Steel tubes and pipes are classified into seamless steel tubes and pipes used for
pressure piping system AND seamless steel tubes and pipes used for boilers and
super-heaters, according to the functions.
3.2.1 Seamless steel tubes and pipes used for pressure piping system are classified
into three grads according to the design pressure and temperature as shown in
Table1.
3.2.3 Expression methods are as follows.
4 Ordering Information
The contract or order for purchasing steel tubes and pipes according to this standard
shall include the following contents.
5 Dimension, Shape, Weight and Allowable Deviation
5.1 Outer diameter and wall thickness
5.1.1 The dimension of series 1 in Table 1 of GB/T 17395 shall be preferred for steel
tubes and pipes. As required by the purchaser, steel tubes and pipes of other
dimension may be supplied based on the agreement of both the supplier and the
purchaser.
5.4 Pipe end shape
Both end faces of steel tubes and pipes shall be vertical to the tube and pipe axes and
notch burrs shall be cleaned away.
5.5 Out-of-roundness and wall unevenness
As required by the purchaser and indicated in the contract, the out-of-roundness and
wall unevenness of steel tubes and pipes on the same section shall not exceed 80%
of the outer diameter tolerance and wall thickness tolerance respectively.
5.6 Delivered weight
Steel tubes and pipes may be delivered according to actual weight or theoretical
weight. The theoretical weight per meter shall be in accordance with the requirements
of GB/T 17395 (the steel density is 7.85 kg/dm3).
6 Technical Requirements
6.1 Steel grade and chemical composition
6.1.1 Steel grade and chemical composition (heat analysis) shall be in accordance
with those specified in Table 4.
6.2 Manufacturing methods
6.2.1 Smelting process of steel
Steels shall be smelted by electric furnace with external refining or oxygen converter
with external refining.
6.3 Delivery state
Steel tubes and pipes shall be delivered in normalized conditions. If the finishing
temperature of hot rolled steel tubes and pipes is not less than Ar3, it may be deemed
as normalizing.
6.4 Mechanical properties
6.4.1 Longitudinally mechanical properties of those steel tubes and pipes in delivery
state shall meet those specified in Table 5.
6.4.3 Impact test
As required by the purchaser, impact test may be conducted for the steel tubes and
pipes with a wall thickness greater than 10mm based on the agreement of both the
supplier and the purchaser and indicated in the contract.
6.5 Hydraulic test
Hydraulic test shall be carried out for steel tubes and pipes one by one and the test
pressure shall be calculated according to Formula (1), which shall not be greater than
14 MPa. Under the test pressure, pressure stabilizing time shall not be less than 10s
and the steel tubes and pipes shall be free from leakage.
6.7 Surface quality
No crack, folding, lamination, scar and creasing is allowed on the internal and external
surfaces of the steel tubes and pipes. All of these defects shall be eliminated and the
actual wall thickness at the eliminating places shall not be less than the minimum
allowable wall thickness deviation.
7 Inspection and Testing Methods
7.1 The dimension and shape of steel tubes and pipes shall be measured one by
one with measuring instruments meeting the precision requirements.
7.2 The internal and external surfaces of steel tubes and pipes shall be inspected
visually one by one at sufficient lighting condition.
8 Inspection Rules
8.1 Inspection and acceptance
The inspection and acceptance of steel tubes and pipes shall be carried out by the
quality and technical supervision department of the supplier.
8.2 Lot grouping rules
8.2.1 Steel tubes and pipes are inspected and accepted based on lots.
8.3 Re-inspection and judgment rules
The re-inspection and judgment rules of steel tubes and pipes shall meet the
requirements of GB/T 2102.
9 Packing, Marking and Quality Certificate
The packing, marking and quality certificate of steel tubes and pipes shall comply with
those specified in 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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