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GB/T 37577-2019

Chinese Standard: 'GB/T 37577-2019'
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BASIC DATA
Standard ID GB/T 37577-2019 (GB/T37577-2019)
Description (Translated English) Welded large diameter steel pipes for low-temperature-service piping
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H48
Classification of International Standard 77.140.75
Word Count Estimation 18,141
Date of Issue 2019-06-04
Date of Implementation 2020-05-01
Drafting Organization Panyu Zhujiang Steel Pipe (Lianyungang) Co., Ltd., Zhangjiagang Shagang Jinzhou Pipeline Co., Ltd., Baoji Petroleum Pipe Co., Ltd. (National Oil and Gas Pipeline Engineering Technology Research Center), Metallurgical Industry Information Standards Institute
Administrative Organization National Steel Standardization Technical Committee (SAC/TC 183)
Proposing organization China Iron and Steel Association
Issuing agency(ies) State Administration of Markets and China National Standardization Administration

GB/T 37577-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Welded large diameter steel pipes for low-
temperature-service piping
低温管道用大直径焊接钢管
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Ordering content ... 7 
4 Dimensions, shape, and weight ... 7 
5 Technical requirements ... 10 
6 Test methods ... 21 
7 Inspection rules ... 22 
8 Packing, marking, and quality certification ... 23 
Appendix A (Informative) Common outer diameter and wall thickness ... 24 
Appendix B (Normative) Treatment methods of defects ... 25 
Welded large diameter steel pipes for low-
temperature-service piping
1 Scope
This Standard specifies the ordering content, dimensions, shape, weight,
technical requirements, test methods, inspection rules, packing, marking, and
quality certification of welded large diameter steel pipes for low-temperature-
service piping.
This Standard is applicable to welded large diameter steel pipes (hereinafter
referred to as steel pipes) for low-temperature-service piping with a -20°C level
~ -196°C level and an outer diameter of not less than 114.3 mm.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are 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 223.12 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 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-
Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the
Determination of Vanadium Content
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 223.23 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 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The
sodium arsenite-sodium nitrite titrimetric method for the determination of
manganese content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The
butyl acetate extraction photometric method for the determination of
phosphorus 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 223.84 Steel and iron - Determination of titanium content -
Diantipyrylmethane spectrophotometric method
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 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 241 Metal materials - Tube - Hydrostatic pressure test
GB/T 246 Metal materials - Tube - Flattening test
GB/T 2102 Acceptance, packing, marking and quality certification of steel
pipe
GB/T 2650 Impact test methods on welded joints
GB/T 2651 Tensile test method on welded joints
GB/T 2653 Bend test methods on welded joints
GB/T 2975 Steel and Steel Products - Location and Preparation of Test
Pieces for Mechanical Testing
GB/T 3531 Steel plates for low temperature pressure vessels
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine
method)
GB/T 19293 Method of X-ray radioscopy for butt-weld
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)
GB/T 20125 Low-alloy steel - Determination of multi-element contents -
Inductively coupled plasma atomic emission spectrometric method
GB/T 21835 Dimensions and masses per unit length of welded steel pipes
GB/T 26955 Destructive tests on welds in metallic materials - Macroscopic
and microscopic examination of welds
NB/T 47014 Welding procedure qualification for pressure equipment
SY/T 6423.1 Petroleum and natural gas industries - Non-destructive testing
(NDT) methods of steel tubes - Part 1: Radiographic testing of weld seam of
welded steel tubes for detection of imperfections
SY/T 6423.2 Petroleum and natural gas industries - Non-destructive testing
(NDT) methods of steel tubes - Part 2: Automated ultrasonic testing of the
weld seam of welded steel tubes for the detection of longitudinal and/or
transverse imperfections
SY/T 6423.4 Petroleum and natural gas industries - Non-destructive testing
(NDT) methods of steel tubes - Part 4: Automated ultrasonic testing of
seamless and welded steel tubes for the detection of laminar imperfections
SY/T 6423.5 Petroleum and natural gas industries - Non-destructive testing
(NDT) methods of steel tubes - Part 5: Digital radiographic testing of the weld
seam of welded steel tubes for the detection of imperfections
a) When the outer diameter is greater than 1422 mm, the shearing oblique
shall not exceed 2.4 mm;
b) The shearing oblique of the remaining steel pipes shall not exceed 1.6
mm.
4.6.2 Both end faces of the steel pipe shall be flat (not machined with groove).
According to the requirements of the purchaser, both end faces of the steel pipe
may be machined with the groove. The groove size shall be indicated in the
contract.
4.7 Weight
4.7.1 Steel pipes are delivered at actual weight and may also be delivered at
theoretical weight. The theoretical weight of the steel pipe is calculated
according to formula (1).
Where:
W - The weight per unit length, in kilograms per meter (kg/m);
t - Nominal wall thickness, in millimeters (mm);
D - Nominal outer diameter, in millimeters (mm).
4.7.2 The tolerance of the actual weight of the steel pipe from the theoretical
weight is %-3+7 .
5 Technical requirements
5.1 Designation and chemical composition of steel
5.1.1 The designation and chemical composition (heat analysis) of the steel
shall comply with the requirements of Table 3. According to the requirements of
the purchaser, through negotiation between the supplier and the purchaser,
steel pipes of designations other than those specified in Table 3 may be
supplied.
5.1.2 The permissible tolerances for chemical composition of the product shall
comply with the provisions of GB/T 222. The permissible tolerances for
chemical analysis of P and S in 08Ni3DR and 06Ni9DR steel products are:
P+0.003%, S+0.002%.
welding with filler metal (GTAW), and a combination of processes between them.
5.2.2.2 Before welding, the base metal may be preheated. Unless otherwise
stipulated in the contract, the preheating temperature and the base metal range
shall be determined by the manufacturer according to the base metal’s delivery
state, chemical composition, mechanical properties, welding properties,
weldment thickness, degree of restraint of welded joint, welding method, etc., if
necessary, determined by a test.
5.2.3 Double-seam steel pipe
According to the requirements of the purchaser, through negotiation between
the supplier and the purchaser, and indicated in the contract, for the steel pipe
with an outer diameter of not less than 914 mm, double-seam steel pipe may
be supplied. The weld seams of double-seam steel pipe shall be approximately
180° apart.
5.2.4 Steel pipe butt
Through negotiation between the supplier and the purchaser, and indicated in
the contract, butt pipes may be supplied. The butt pipes shall comply with the
following regulations:
a) The length of the short pipe used for butting shall not be less than 1500
mm;
b) On the circumferential weld seam of butt pipe, the circumferential spacing
between the straight weld seams shall not be less than 50 mm;
c) The bending degree of the butt pipe shall comply with the provisions of
4.4.
5.3 Delivery state
Unless otherwise stipulated in the contract, the steel pipe shall be delivered in
the state of welding or whole-pipe stress relief heat treatment. The
recommended heat treatment system for steel pipes is shown in Table 4.
c) No cracks exceeding 3.2 mm in length or cracks and fractures exceeding
12.5% of the nominal wall thickness in depth shall be found on the base
metal, heat-affected zone, or fusion line;
d) During the test, cracks appearing at the edge of the sample and having a
length of less than 6.4 mm shall not be used as a basis for rejection.
5.7 Surface quality
5.7.1 Surface defects
The inner and outer surfaces of the steel pipe shall be free of folds, cracks,
delamination, electric arc burns, and other defects whose depth exceeds the
lower tolerance of the wall thickness. These defects shall be completely
removed. The remaining wall thickness at the clearing shall be no less than the
minimum allowable wall thickness.
5.7.2 Crater
There shall be no craters with a depth of more than 6.4 mm on the wall of the
steel pipe. The crater length, in any direction, shall not exceed 0.5D. When the
concave part is sharply scratched, the crater depth shall not exceed 3.2 mm.
When the concave part is sharply scratched, the sharp scratch shall be ground.
The depth and length of the concavity after grinding shall conform to the
provisions of this subclause. The remaining wall thickness at the grinding
location shall meet the corresponding requirements.
Note: The crater depth is the distance between the lowest point of the concavity and the
original contour extension of the steel pipe.
5.7.3 Undercut
5.7.3.1 Any length of weld undercut with a depth of no more than 0.4 mm is
allowed.
5.7.3.2 For a single undercut with a depth greater than 0.4 mm but not greater
than 0.8 mm and not exceeding 0.1t and a length not exceeding 0.5t, and the
undercut is no more than 2 over any 300 mm weld seam length, it shall be
disposed of in accordance with B.1.2 a) in Appendix B.
5.7.3.3 Undercuts exceeding those specified in 5.7.3.2 shall be considered
defects and shall be disposed of in accordance with B.1.2 b).
5.7.4 Surplus height and burr of weld seam
5.7.4.1 The outer burr of the weld seam of high-frequency welded steel pipe
shall be removed to be flush with the base metal. The inner burr shall be
fusion welded steel pipe shall not exceed 3 mm. The offset shall be verified by
macroscopic examination method. The supplier shall take a weld seam cross-
section sample from each lot of steel pipes for macrostructure topography
examination.
5.9 Non-destructive testing
5.9.1 Radiographic testing of weld seam
5.9.1.1 The weld seam of electric fusion welded steel pipe shall be subjected to
100% radiographic testing. Radiographic testing shall adopt radiographic
shooting testing, radiographic digital imaging testing, or industrial television
real-time imaging testing.
5.9.1.2 The radiographic testing of weld seam shall comply with the following
regulations:
a) Radiographic film photography shall comply with the requirements of SY/T
6423.1. The image quality level shall be level AB;
b) Radiographic digital imaging testing shall comply with the requirements of
SY/T 6423.5. The static image quality level shall be level A;
c) The radiographic industrial television real-time imaging testing shall meet
the requirements of GB/T 19293. The dynamic testing sensitivity shall be
better than 4%. The testing speed shall be no more than 4.5 m/min or in
accordance with the agreement between the supplier and the purchaser;
d) It shall keep the radiographic shooting testing film, or radiographic testing
digital image, or industrial television real-time imaging testing image.
5.9.1.3 Unless otherwise stipulated in the contract, radiographic testing
acceptance shall be in accordance with SY/T 6423.1.
5.9.2 Ultrasonic testing of weld seam
5.9.2.1 According to the requirements of the purchaser, through negotiation
between the supplier and the purchaser, and indicated in the contract, the weld
seam of electric fusion welded steel pipe may be longitudinally and transversely
ultrasonically tested. The acceptance level shall meet the requirements of U3
or U3H in SY/T 6423.2.
5.9.2.2 The weld seam of high-frequency welded pipe shall be subjected to full-
length ultrasonic testing. The acceptance level shall comply with the provisions
of U3 or U3H in SY/T 6423.2.
5.9.3 Non-destructive testing of pipe end
The 25 mm width area of each steel pipe end shall be examined for
delamination. The testing area shall have no delamination defects with a hoop
size greater than 6.0 mm.
5.10 Treatment of defects
5.10.1 The weld seams of high-frequency welded steel pipe and the defects of
the base metal shall not be repaired by welding.
5.10.2 The defects of base metal of electric fusion welded steel pipe shall not
be repaired by welding. The weld seam may be repaired by welding. The defect
treatment method shall comply with the provisions of Appendix B.
6 Test methods
6.1 Sampling for chemical composition analysis of steel pipes shall be carried
out in accordance with the rules of GB/T 20066. Chemical composition analysis
is usually carried out according to GB/T 4336, GB/T 20123, GB/T 20125, or
other common methods. For arbitration, it shall be in accordance with GB/T
223.5, GB/T 223.9, GB/T 223.12, GB/T 223.14, GB/T 223.18, GB/T 223.23,
GB/T 223.25, GB/T 223.26, GB/T 223.40, GB/T 223.58, GB/T 223.62, GB/T
223.68, GB/T 223.84, GB/T 223.86, and GB/T 20125.
6.2 The dimensions and shape of the steel pipe shall be measured one by one
using measuring tools or instruments such as a diameter tape measure, a
caliper, an optical measuring instrument, etc., which meet the accuracy
requirements. The outer diameter of the steel pipe shall be measured at least
50 mm away from the pipe end.
6.3 The inner and outer surfaces of the steel pipe shall be inspecte......
Related standard:   GB/T 37578-2019  GB/T 21833.1-2020
Related PDF sample:   GB/T 37578-2019
   
 
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