GB/T 38810-2020 (GB/T38810-2020, GBT 38810-2020, GBT38810-2020) & related versions
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Seamless stainless steel pipes for liquefied natural gas
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GB/T 38810-2020
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GB/T 38810-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Seamless stainless steel pipes for liquefied natural
gas
ISSUED ON: JUNE 02, 2020
IMPLEMENTED ON: DECEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Ordering content ... 6
4 Size, shape and weight ... 6
5 Technical requirements ... 8
6 Test methods ... 13
7 Inspection rules ... 14
8 Packaging, marks and quality certificate ... 15
Seamless stainless steel pipes for liquefied natural
gas
1 Scope
This Standard specifies ordering content, size, shape and weight, technical
requirements, test methods, inspection rules, packaging, marks and quality
certificate for seamless stainless steel pipes for liquefied natural gas.
This Standard is applicable to cold rolled (drawn) austenitic stainless steel
seamless steel pipes for liquefied natural gas (hereinafter referred to steel
pipes).
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 223.11, Iron, Steel and Alloy - Determination of Chromium Content -
Visual Titration or Potentiometric Titration Method
GB/T 223.25, Methods for chemical analysis of iron, steel and alloy. The
dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.28, Methods for chemical analysis of iron, steel and alloy - The α-
benzoin oxime gravimetric method for the determination of molybdenum
content
GB/T 223.40, Iron, Steel and Alloy - Determination of Niobium Content by
the Sulphochlorophenol S 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 223.60, Methods for chemical analysis of iron, steel and alloy - The
perchloric acid dehydration gravimetric method for the determination of
Spark discharge atomic emission spectrometric method (Routine method)
GB/T 17395, Dimensions, shapes, masses and tolerances of seamless steel
tubes
GB/T 20066, Steel and Iron-Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123, Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
3 Ordering content
The contract or order for ordering steel pipes according to this Standard shall
include but not limited to the following:
a) reference to this Standard;
b) product name;
c) steel designation;
d) dimensions (nominal outer diameter × nominal wall thickness, in mm);
e) quantity ordered (total weight or total length);
f) optional requirements;
g) other special requirements.
4 Size, shape and weight
4.1 Outer diameter and wall thickness
4.1.1 The nominal outer diameter (D) and nominal wall thickness (S) of steel
pipes shall meet the requirements of GB/T 17395. Required by the purchaser
and agreed by the supplier and the purchaser, steel pipes of other sizes beyond
those specified in GB/T 17395 can be supplied.
4.1.2 The allowable deviation of the nominal outer diameter and the nominal
wall thickness of steel pipes shall meet the requirements of Table 1.
4.1.3 When the purchaser does not specify the allowable deviation level of the
steel pipe size in the contract, the allowable deviation of the outer diameter and
the wall thickness of steel pipes shall meet the requirements of ordinary
a) The wall thickness is not more than 15mm, 1.5mm/m;
b) The wall thickness is greater than 15mm, 2.0mm/m.
4.4 End shape
4.4.1 The ends of steel pipe shall be cut flat. It shall remove the incision burrs.
4.4.2 Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, groove can be processed at both ends of steel pipe.
The groove type is determined by the supplier and the purchaser through
negotiation.
4.5 Out-of-roundness and unevenness of wall thickness
Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, the out-of-roundness of steel pipes shall not exceed
80% of the outer diameter tolerance. The unevenness of wall thickness of steel
pipes shall not exceed 80% of the wall thickness tolerance.
4.6 Weight
4.6.1 Steel pipes are delivered according to actual weight. Required by the
purchaser, agreed by the supplier and the purchaser and indicated in the
contract, steel pipes can also be delivered according to theoretical weight.
4.6.2 The theoretical weight per meter of steel pipes is calculated according to
formula (1):
Where,
W - Theoretical weight of steel pipe, in kilograms per meter (kg/m);
π – 3.1416;
ρ - Density of steel, in kilograms per cubic decimeter (kg/dm3), see Table 3;
D - Nominal outer diameter of steel pipe, in millimeters (mm);
S - Nominal wall thickness of steel pipe, in millimeters (mm).
5 Technical requirements
5.1 Designation and chemical composition
pressure test.
5.5.4 The supplier can use eddy current testing to replace hydraulic pressure
test. The artificial defects of the eddy current testing’s comparison sample tube
shall meet the requirements of the acceptance level E4H or E4 in GB/T 7735-
2016.
5.6 Process performance
5.6.1 Flattening
Steel pipes shall be subjected to flattening test. During the flattening test, the
sample shall be pressed until the distance between the two plates is H. H is
calculated according to formula (3). After flattening, there shall be no cracks or
breaks on the outside of the sample bend.
Where,
H - Distance between two plates, in millimeters (mm);
α - Deformation coefficient per unit length, taking 0.09;
S - Nominal wall thickness of steel pipe, in millimeters (mm);
D - Nominal outer diameter of steel pipe, in millimeters (mm).
5.6.2 Flaring
Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, steel pipes of which the outer diameter is not greater
than 168.3mm and the wall thickness is not greater than 10mm may be
subjected to flaring test. The top core taper of the flaring test is 60°. The flaring
rate of the outer diameter is 10%. After flaring, the sample shall not have visible
cracks.
5.7 Intergranular corrosion
Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, steel pipes can be tested for intergranular corrosion.
The intergranular corrosion test method shall meet the requirements of method
E in GB/T 4334-2020. After the test, the sample shall not have the tendency of
intergranular corrosion.
5.8 Surface quality
5.8.1 There shall be no cracks, folds, folds, delamination and scars on the inner
and outer surfaces of steel pipe. These defects shall be completely removed.
The removal depth shall not exceed 10% of the wall thickness. The actual wall
thickness where the defect is removed shall not be less than the minimum
allowable wall thickness.
5.8.2 The allowable depth of the straightway on the inner and outer surfaces of
steel pipe shall not be greater than 4% of the wall thickness, not greater than
0.3mm.
5.8.3 Other local defects that do not exceed the deviation of the wall thickness
are allowed to exist.
5.9 Ultrasonic testing
Steel pipes shall be ultrasonically tested. The artificial defects of the ultrasonic
testing’s comparison sample tube shall meet the requirements of the
acceptance level U3 in GB/T 5777-2019.
6 Test methods
6.1 The sampling for chemical composition analysis of steel pipes shall be
carried out according to the rules of GB/T 20066. Chemical composition
analysis is usually carried out according to GB/T 11170, GB/T 20123 or other
general methods. During arbitration, it shall be conducted in accordance with
GB/T 223.11, GB/T 223.25, GB/T 223.28, GB/T 223.40, GB/T 223.59, GB/T
223.60, GB/T 223.63, GB/T 223. 84, GB/T 223.85, GB/T 223.86.
6.2 The size and shape of steel pipe shall be measured one by one with a
measuring tool that meets the accuracy requirements.
6.3 The inner and outer surfaces of steel pipe shall be visually inspected or
endoscopically inspected one by one under sufficient lighting conditions.
6.4 The test methods and sampling methods for other inspection items of steel
pipes shall meet the requirements of Table 5.
Table 5 -- Inspection items, sampling quantity, sampling methods and
test methods of steel pipes
No. Inspection item Sampling quantity Sampling method Test method
1 Chemical composition Take 1 sample per furnace GB/T 20066 See 6.1
......
| Standard ID | GB/T 38810-2020 (GB/T38810-2020) | | Description (Translated English) | Seamless stainless steel pipes for liquefied natural gas | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 10,179 | | Date of Issue | 2020-06-02 | | Date of Implementation | 2020-12-01 | | Drafting Organization | Jiangsu Wujin Stainless Co., Ltd., Zhejiang Jiuli Special Material Technology Co., Ltd., Shanxi Taigang Stainless Steel Pipe Co., Ltd., China Huanqiu Engineering Co., Ltd. Beijing Branch, Shangshang Desheng Group Co., Ltd., Zhongxing Energy Equipment Co., Ltd., Suzhou Gangtewei Steel Pipe Co., Ltd., Zhejiang Yongshang Special Materials Co., Ltd., Wison (Nantong) Heavy 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 Association | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
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