GB/T 3091-2025 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3091-2025 | English | 335 |
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Welded steel pipes for low pressure fluid delivery
| Valid |
| GB/T 3091-2015 | English | 85 |
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Welded steel pipes for low pressure liquid delivery
| Valid |
| GB/T 3091-2008 | English | 85 |
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Welded steel pipes for low pressure liquid delivery
| Obsolete |
| GB/T 3091-2001 | English | 479 |
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4 days
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Welded steel pipe for low pressure liquid delivery
| Obsolete |
| GB/T 3091-1993 | English | RFQ |
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3 days
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Galvanized welded steel pipe for low pressure service
| Obsolete |
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GB/T 3091-2025: Welded steel pipes for low pressure fluid delivery---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/GBT3091-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 3091-2015
Welded steel pipes for low pressure fluid delivery
Issued on. MARCH 28, 2025
Implemented on. OCTOBER 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 8
4 Order content... 9
5 Dimensions, shape, weight and allowable deviation... 9
6 Technical requirements... 16
7 Test methods... 23
8 Inspection rules... 24
9 Packaging, marking, storage and quality certification... 25
Appendix A (Informative) Dimensions of steel pipes with threaded and grooved ends
... 27
Appendix B (Normative) Determination of the weight of zinc coating - Antimony
chloride method... 28
Appendix C (Normative) Uniformity test of zinc coating - Copper sulfate immersion
method... 32
1 Scope
This document specifies the order content, dimensions, shape, weight and allowable
deviation, technical requirements, test methods, inspection rules, packaging, marking,
storage and quality certification for welded steel pipes for low pressure fluid delivery.
This document applies to straight-seam high-frequency electric welded (HFW) steel
pipes, straight-seam submerged-arc welded (SAWL) steel pipes and spiral-seam
submerged-arc welded (SAWH) steel pipes for low pressure fluid delivery of water, air,
steam and gas, as well as galvanized steel pipes (hereinafter referred to as “steel pipes”).
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) 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 aluminium content - Chrom
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-
benzoyl-N-phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.23, Iron, Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
GB/T 223.26, Iron, steel and alloy - Determination of molybdenum content - The
thiocyanate spectrophotometric method
GB/T 223.37, Iron, steel and alloy - Determination of nitrogen content - Indophenol
blue spectrophotometric method after distillation separation
GB/T 223.40, Iron, steel and alloy - Determination of niobium content by the
sulphochlorophenol S spectrophotometric method
GB/T 223.53, Methods for chemical analysis of iron, steel and alloy - The flame
atomic absorption spectrophotometric method for the determination of copper
content
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 30062 apply.
4 Order content
The contract or order for steel pipes under this document shall include at least the
following.
a) a reference to this document;
b) product name;
c) steel designation (including the grade);
d) ordering quantity (total weight or total length);
e) dimensions (nominal outside diameter × nominal wall thickness, in
millimeters);
f) length;
5 Dimensions, shape, weight and allowable deviation
5.1 Outside diameter, wall thickness and allowable deviation
5.1.1 Steel pipes are delivered according to nominal outside diameter (D) and nominal
wall thickness (t). For steel pipes with a nominal outside diameter not exceeding 219.1
mm (excluding steel pipes with threaded or grooved ends), their nominal outside
diameter, nominal wall thickness and allowable deviation shall comply with the
provisions of Table 1.
5.1.2 For steel pipes with a nominal outside diameter greater than 219.1 mm, their
nominal outside diameter and nominal wall thickness shall comply with the provisions
of GB/T 17395, and the allowable deviations of the nominal outside diameter and
nominal wall thickness shall comply with the provisions of Table 2.
5.1.3 For steel pipes with threaded or grooved ends, the nominal outside diameter and
nominal wall thickness are given in Appendix A. The allowable deviations of the
outside diameter and wall thickness shall comply with the requirements of Table 1.
5.2 Length
5.2.1 Random length
The random length of steel pipes shall be 3 000 mm ~ 12 000 mm.
5.2.2 Specific length
The specific length of steel pipes shall be within the random length range. The allowable
deviation of the specific length of straight-seam high-frequency electric welded steel
pipes is +15 0 mm; the allowable deviation of the specific length of submerged-arc
welded steel pipes is +50 0 mm.
5.3 Shape
5.3.1 Curvature
5.3.2 Out-of-roundness
The out-of-roundness of steel pipes (the difference between the maximum and
minimum outside diameters of the same transverse plane) shall comply with the
requirements of Table 3.
5.3.3 End shape
5.3.3.1 The two ends of the steel pipe shall be cut flat; the end face bevel shall not be
greater than 3 mm; the cut burrs shall be removed.
5.3.3.2 As required by the buyer, negotiated between the supplier and the buyer, and
indicated in the contract, the pipe ends may be threaded in accordance with the
provisions of GB/T 7306.2.
5.3.4 Other shapes
As required by the buyer, negotiated between the supplier and the buyer, and indicated
in the contract, steel pipes of other shape requirements can be supplied.
5.4 Weight
5.4.1 Steel pipes are delivered according to actual weight. After negotiation between
the supplier and the buyer, steel pipes can also be delivered according to the theoretical
weight.
5.4.2 The theoretical weight of steel pipes is calculated according to Formula (1) (the
density of steel is 7.85 kg/dm3).
6 Technical requirements
6.1 Steel designation and chemical composition
6.1.1 The steel designation and chemical composition (melting analysis) shall conform
to the requirements for Q195, Q215A, Q215B, Q235A, Q235B, Q275A, and Q275B in
GB/T 700, as well as Q355B in GB/T 1591, respectively. As required by the buyer, and
negotiated between the supplier and the buyer, steel pipes of other designations can also
be supplied.
6.2 Raw material requirements
The steel strips and steel plates used to manufacture steel pipes shall comply with the
requirements of GB/T 709, GB/T 3274 and GB/T 3524 respectively; zinc ingots shall
comply with the requirements of GB/T 470.As required by the buyer, negotiated
between the supplier and the buyer, and indicated in the contract, raw materials of other
requirements may also be used.
6.3 Manufacturing methods of steel pipes
Steel pipes shall be manufactured by straight-seam high-frequency electric welding,
straight-seam submerged-arc welding or spiral-seam submerged-arc welding.
6.4 Delivery state
6.4.1 Steel pipes are delivered in welded or hot-dip galvanized state.
6.5 Mechanical properties
6.5.1 Base material stretching
6.6 Process performance
6.6.1 Bending
Straight-seam high-frequency electric welded steel pipes with a nominal outside
diameter not exceeding 60.3 mm shall be subjected to a bending test. During the test,
the sample shall not have fillers; the bending radius shall be 6 times the nominal outside
diameter of the steel pipe; the bending angle shall be 90°; the weld shall be located at a
position 90° to the bending plane (i.e., the neutral line of the bending). After the test,
no cracks or breaks are allowed on the samples.
6.7 Hydraulic
6.8 Surface quality
6.8.1 Weld seam
6.8.1.1 Flash height of straight-seam high-frequency electric welded steel pipe
The external burrs of the steel pipe weld shall be removed and the remaining height
shall not exceed 0.5 mm. As required by the buyer, negotiated between the supplier and
the buyer, and indicated in the contract, the internal burrs of the steel pipe weld can be
removed. After internal burrs of the weld seam are removed, the remaining height shall
not be greater than 1.5 mm, and the groove depth shall meet the following requirements.
7 Test methods
7.1 The sampling for chemical composition analysis of steel pipes shall comply with
the rules of GB/T 20066.Chemical composition analysis shall generally comply with
the provisions of GB/T 4336, GB/T 20123, GB/T 20124, GB/T 20125 or other general
methods. During arbitration, the provisions of GB/T 223.9, GB/T 223.12, GB/T 223.14,
GB/T 223.23, GB/T 223.26, GB/T 223.37, GB/T 223.40, GB/T 223.53, GB/T 223.59,
GB/T 223.60, GB/T 223.63, GB/T 223.84, GB/T 223.85, GB/T 223.86 and GB/T 20125
shall be followed.
7.2 The dimensions and shape of steel pipes, the burr height of electric welded steel
pipes and the weld bead height of submerged-arc welded steel pipes shall be measured
using measuring tools or instruments that meet the accuracy requirements.
7.3 The surface quality of steel pipes shall be visually inspected pipe by pipe under
adequate lighting conditions.
7.4 The sampling quantity, sampling method and test method of other inspection items
of steel pipes shall comply with the provisions of Table 8.
8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of steel pipes shall be carried out by the supplier's quality
and technical supervision department.
8.2 Batch rules
Steel pipes shall be inspected and accepted in batches. Each batch shall consist of steel
pipes of the same designation, same furnace number, same specification, same welding
process, same heat treatment system (if applicable) and same zinc coating (if applicable)
requirements. The quantity of each batch of steel pipes shall not exceed the following
provisions.
8.3 Sampling quantity
The sampling quantity for each inspection of steel pipes shall comply with the
provisions of Table 8.
8.4 Re-inspection and determination rules
8.4.1 The judgment rule for the test result of the zinc coating weight of galvanized steel
pipes shall comply with the following.
8.4.2 The re-inspection and determination rules for other inspection items of steel pipes
shall comply with the provisions of GB/T 2102.
9 Packaging, marking, storage and quality certification
9.1 Packaging
The packaging of steel pipes shall comply with the provisions of GB/T 2102.
9.2 Marking
9.2.1 In addition to the labels affixed to each bundle, each galvanized steel pipe shall
be marked on the surface of at least. the manufacturer's name or trademark, this
document number, steel designation, dimensions and traceability identification number
(or code).
9.2.2 Other requirements for steel pipe marking shall comply with the provisions of GB/T 2102.
9.3 Storage
Steel pipes shall be stored away from contact with corrosive media, and the storage
environment shall avoid being damp, dark, and airtight.
9.4 Quality certification
The quality certification of steel pipes shall comply with the provisions of 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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