GB/T 12771-2019 PDF English
US$185.00 · In stock · Download in 9 secondsGB/T 12771-2019: Welded Stainless Steel Pipes for Fluid Transport Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 12771: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12771-2019 | English | 185 |
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Welded Stainless Steel Pipes for Fluid Transport
| Valid |
| GB/T 12771-2008 | English | 85 |
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Welded stainless steel pipes for liquid delivery
| Obsolete |
| GB/T 12771-2000 | English | 559 |
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Welded stainless steel pipes for liquid delivery
| Obsolete |
| GB/T 12771-1991 | English | 479 |
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4 days
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Welded stainless steel pipes for liquid delivery
| Obsolete |
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GB/T 12771-2019: Welded Stainless Steel Pipes for Fluid Transport---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/GBT12771-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 12771-2008
Welded Stainless Steel Pipes for Fluid Transport
Issued on. OCTOBER 18, 2019
Implemented on. SEPTEMBER 1, 2020
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 Classification and Code... 7
4 Order Content... 8
5 Dimensions, Appearance and Weight... 8
6 Technical Requirements... 12
7 Test Methods... 20
8 Inspection Rules... 21
9 Packaging, Marking and Quality Certificate... 22
1 Scope
This Standard stipulates the classification, code, order content, dimensions,
appearance and weight, technical requirements, test methods, inspection rules,
packaging, marking and quality certificate of welded stainless steel pipes for fluid
transport.
This Standard is applicable to welded stainless steel pipes for fluid transport
(hereinafter referred to as steel pipes).
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products;
GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum 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 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Thiosulfate Separation Iodimetric Method for the Determination of Copper Content;
GB/T 223.19 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neocuproine
Chloroform Extraction Photometric Method for the Determination of Copper Content;
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method;
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content;
3 Classification and Code
3.1 In accordance with manufacturing method and radiographic testing, the
classification and code of steel pipes are as follows.
3.2 In accordance with delivery status, the classification and code of steel pipes are as follows.
4 Order Content
Contract or order form that purchase steel pipes in accordance with this Standard shall
include the following content.
5 Dimensions, Appearance and Weight
5.1 External Diameter and Wall Thickness
Nominal external diameter (D) and nominal wall thickness (S) of steel pipes shall
comply with the stipulations in GB/T 21835.In accordance with the demand-side’s
demands, through the negotiation between the demand-side and the supply-side, steel
pipes of other external diameters and wall thicknesses may also be provided.
5.2 Allowable Deviation of External Diameter and Wall Thickness
5.3 Length
5.3.1 Generally speaking, the length of steel pipes is 3,000 mm ~ 12,000 mm.
5.3.2 In accordance with the demand-side’s demands, through the negotiation
between the demand-side and the supply-side, and statement in the contract, steel
pipes may be delivered in accordance with specified length or multiple length. The
specified length of total multiple length of steel pipes shall be within a general range;
the full-length allowable deviation is. In terms of steel pipes which are
delivered in accordance with multiple length, each incision shall retain a margin of 5
mm ~ 10 mm.
5.4 Out-of-roundness
Out-of-roundness of steel pipes shall not exceed the allowable tolerance of external
diameter. The difference between the maximum value and the minimum value of
external diameter actually measured on any cross section of thin-wall steel pipes shall
not exceed 1% of nominal external diameter.
5.5 Curvature
Curvature of steel pipes shall be not more than 1.5 mm/m; full-length curvature shall
be not more than 0.2% of the total length of steel pipes.
5.7 Weight
Steel pipes may be delivered in accordance with the theoretical weight, or, the actual
weight. When steel pipes are delivered in accordance with the theoretical weight,
theoretical weight shall be calculated in accordance with Formula (1).
6 Technical Requirements
6.1 Designation and Chemical Composition of Steel
6.1.1 Designation and chemical composition (smelting analysis) of steel shall comply
Designation Formula (1) after Conversion Density /(kg/dm3) No. Type Uniform Digital Code
6.1.2 When the demand-side requests for analysis of finished products, it shall be
indicated in the contract. The allowable deviation of chemical composition of finished
steel pipes shall comply with the stipulations in GB/T 222.
6.2 Manufacturing Methods
6.2.1 Smelting methods of steel
Steel shall adopt the smelting method of converter plus secondary furnace refining, or,
electric-arc furnace plus secondary furnace refining. Through the negotiation between
the demand-side and the supply-side, and statement in the contract, other smelting
methods with more rigorous requirements may also be adopted.
6.2.2 Manufacturing methods of steel pipes
6.3 Delivery Status
6.3.1 Steel pipes shall be delivered under the status of thermal treatment and acid
pickling. Through the negotiation between the demand-side and the supply-side, and
statement in the contract, steel pipes may also be delivered under the status of welding.
Please refer to Table 4 for the recommended thermal treatment systems of steel pipes.
6.3.2 Steel pipes that go through overall polishing, boring or thermal treatment with
protective atmosphere may be delivered without acid pickling.
6.4 Mechanical Properties
6.4.1 Tensile
Steel pipes shall receive tensile test on base metals. The room-temperature
longitudinal tensile performance of base metals shall comply with the stipulations in Table 4.
6.5 Process Performance
6.5.1 Flattening
Steel pipes whose external diameter is not more than 168 mm shall receive flattening
test. During the test, welding seam shall be located in a location that is 90 of the force-
bearing direction. In terms of steel pipes which receive thermal treatment, samples
shall be flattened to 1/3 of the external diameter of steel pipes. In terms of steel pipes
which do not receive thermal treatment, samples shall be flattened to 2/3 of the
external diameter of steel pipes. After flattening, samples shall not manifest any cracks
or breakages.
6.6 Intergranular Corrosion
Except from designations,
the remaining Austenitic stainless steel pipes shall receive intergranular corrosion test
in accordance with the stipulations of Method E in GB/T 4334-2008.After the test,
7 Test Methods
7.1 The analysis and sampling for the chemical composition test of steel pipes shall
be conducted in accordance with the rules in GB/T 20066.Generally speaking, the
analysis of chemical composition shall be conducted in accordance with GB/T 11170,
GB/T 20123, GB/T 20124, or other universal methods. The arbitration shall comply
with the stipulations in GB/T 223.9, GB/T 223.11, GB/T 223.18, GB/T 223.19, GB/T
223.23, GB/T 223.25, GB/T 223.26, GB/T 223.28, GB/T 223.36, GB/T 223.37, GB/T
223.40, GB/T 223.59, GB/T 223.60, GB/T 223.63, GB/T 223.68, GB/T 223.69, GB/T
223.84, GB/T 223.85, GB/T 223.86.
7.2 Dimensions and appearance of steel pipes shall be measured one by one through
measuring instruments that comply with the requirements of accuracy.
7.3 The internal and external surface quality of steel pipes shall be visually inspected
one by one under the condition of thorough illumination. The surplus height of welding
seam shall be measured through measuring instruments that comply with the
requirements of accuracy.
7.4 The sampling methods and test methods of other tests of steel pipes shall comply
with the stipulations in Table 5.
8 Inspection Rules
8.1 Inspection and Acceptance Inspection
The inspection and acceptance inspection of steel pipes shall be conducted by the
supply-side’s quality and technology supervision department.
8.2 Batch Rules
The chemical composition of steel pipes may be inspected and accepted in
accordance with furnace. The remaining inspection items of steel pipes shall be
inspected and accepted in accordance with batch. Each batch shall be constituted of
steel pipes of the same designation, the same furnace No., the same dimensions, the
same welding process and the same thermal treatment system. The quantity of each
batch of steel pipes shall not exceed the following stipulations.
8.3 Sampling Quantity
The sampling quantity of steel pipes for each inspection item shall comply with the
stipulations in Table 5.
8.4 Re-inspection and Determination Rules
Re-inspection and determination rules of steel pipes shall comply with the stipulations
in GB/T 2102.
9 Packaging, Marking and Quality Certificate
9.1 The marking of steel pipes shall include the code, which is classified in accordance
with manufacturing method and radiographic testing. The remaining requirements shall
comply with the stipulations in GB/T 2102.Example 1 and Example 2 provide marking
examples of steel pipes.
9.2 The packaging and quality certificate of steel pipes shall comply with the
stipulations 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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