GB/T 37577-2019 English PDF (GBT37577-2019)

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GB/T 37577-2019: Welded large diameter steel pipes for low-temperature-service piping
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
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 t...