GB/T 12771-2019 English PDF (GBT12771-2019)

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GB/T 12771-2019: Welded stainless steel pipes for fluid transport
GB/T 12771-2019
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 
Welded Stainless Steel Pipes for Fluid Transport
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;
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method;
GB/T 223.28 Methods for Chemical Analysis of Iron, Steel and Alloy - The -
benzoinoxime Gravimetric Method for the Determination of Molybdenum Content;
GB/T 223.36 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neutral
Titration Method for the Determination of Nitrogen Content after Distillation Separation;
GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - The Indophenol
Blue Photometric Method for the Determination of Nitrogen Content after Distillation
Separation;
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 Silicon Content;
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;
GB/T 223.69 Iron, Steel and Alloy - Determination of Carbon Contents - Gas-volumetric
Method after Combustion in the Pipe Furnace;
GB/T 223.84 Steel and Iron - Determination of Titanium Content - Diantipyrylmethane
Spectrophotometric Method;
GB/T 223.85 Steel and Iron - Determination of Sulfur Content - Infrared Absorption
Method after Combustion in an Induction Furnace;
GB/T 223.86 Steel and Iron - Determination of Total Carbon Content - Infrared
Absorption Method after Combustion in an Induction Furnace;
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature;
GB/T 241 Metal Materials - Tubes - Hydrostatic Pressure Test;
GB/T 245 Metallic Materials -Tube - Flanging Test;
GB/T 246 Metallic Materials -Tube - Flattening Test;
GB/T 2102 Acceptance, Packing, Marking and Quality Certification of Steel Pipe;
welding; welding seam receives 100% full-length radiographic inspection;
c) III---steel pipes are manufactured through the method of double-sided automatic
welding; welding seam receives partial radiographic inspection;
d) IV---steel pipes are manufactured through the method of single-sided automatic
welding; welding seam receives partial radiographic inspection;
e) V---steel pipes are manufactured through the method of double-sided automatic
welding; welding seam does not receive radiographic inspection;
f) VI---steel pipes are manufactured through the method of single-sided automatic
welding; welding seam does not receive radiographic inspection.
3.2 In accordance with delivery status, the classification and code of steel pipes are as
follows:
a) Status of welding +H;
b) Status of thermal treatment +T;
c) Status of grinding (polishing) +SP.
4 Order Content
Contract or order form that purchase steel pipes in accordance with this Standard shall
include the following content:
a) Serial No. of this Standard;
b) Product name;
c) Steel designation;
d) Dimensions and specifications (external diameter  wall thickness, expressed
in millimeter);
e) Quantity ordered (total weight or total length);
f) Delivery status;
g) Special requirements.
5 Dimensions, Appearance and Weight
5.1 External Diameter and Wall Thickness
with the stipulations in Table 4. However, in arbitration, longitudinal tensile test shall be
subject to.
6.4.2 Tensile test of welded joints
Steel pipes whose external diameter is not less than 168 mm shall receive horizontal
tensile test on welded joints. Samples shall be horizontally taken along the steel pipes,
or, be cut out from test pieces of welding. The test pieces of welding shall be under the
same designation, the same furnace No., the same welding process and the same
thermal treatment system as the steel pipes. Welding seam shall be in the center of
the sample and vertical to the axes of the sample. The tensile strength of welded joints
shall comply with the stipulations of tensile strength of base metals 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.
6.5.2 Horizontal bending test of welding seam ...