GB/T 14976-2025 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14976-2025 | English | 425 |
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Seamless stainless steel pipes for fluid transport
| Valid |
| GB/T 14976-2012 | English | 75 |
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Seamless stainless steel pipes for fluid transport
| Valid |
| GB/T 14976-2002 | English | 439 |
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Stainless steel seamless tubes for fluid transport
| Obsolete |
| GB/T 14976-1994 | English | 519 |
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Stainless steel seamless pipes for fluid transport
| Obsolete |
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GB/T 14976-2025: Seamless 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/GBT14976-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 14976-2012, GB/T 38810-2020, GB/T 40317-2021
Seamless stainless steel pipes for fluid transport
Issued on: AUGUST 01, 2025
Implemented on: FEBRUARY 01, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 4
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 9
4 Classification and code... 10
5 Ordering content... 10
6 Manufacturing process... 11
6.1 Steel smelting methods... 11
6.2 Steel pipe manufacturing method... 11
6.3 Delivery state... 11
7 Technical requirements... 13
7.1 Steel designation and chemical composition... 13
7.2 Mechanical properties... 18
7.3 Hydraulics... 19
7.4 Process performance... 20
7.5 Intergranular corrosion... 21
7.6 Surface quality... 21
7.7 Nondestructive testing... 22
7.8 Special requirements... 22
7.9 Dimensions, appearance and weight... 22
8 Specimens... 26
8.1 Tensile test specimen... 26
8.2 Impact test specimen... 26
8.3 Bend test specimens... 27
9 Test methods... 27
10 Inspection rules... 28
10.1 Inspection and acceptance... 28
10.2 Batching rules... 28
10.3 Sampling quantity... 29
10.4 Reinspection and determination rules... 29
11 Packaging, marking and quality certificate... 29
Annex A (normative) Additional requirements for austenitic stainless steel pipes for low
temperature conditions... 30
A.1 General... 30
A.2 Manufacturing method... 30
A.3 Mechanical properties at room temperature... 30
A.4 Impact... 30
Seamless stainless steel pipes for fluid transport
1 Scope
This document specifies the classification and code, ordering content, manufacturing
process, technical requirements, specimens, test methods, inspection rules, packaging,
marking and quality certificate of seamless stainless steel pipes for fluid transport.
This document applies to seamless stainless steel pipes for fluid transport (hereinafter
referred to as "steel pipes").
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 222, Steels and alloys -- Allowable deviations of product analyzed chemical
composition
GB/T 223.9, Iron, steel and alloy -- Determination of aluminium content – Chrome
azurol S photometric method
GB/T 223.11, Iron, steel and alloy -- Determination of chromium content -
Titrimetric method and spectrophotometric method
GB/T 223.18, Methods for chemical analysis of iron steel and alloy -- The sodium
thiosulfate separation iodometric 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 α-benzoin
GB/T 2102, Acceptance, packaging, marking and quality certification for steel
tubular products
GB/T 2975, Steel and steel products -- Location and preparation of samples and test
pieces for mechanical testing
GB/T 4334-2020, Corrosion of metals and alloys -- Test methods for intergranular
corrosion of austenitic and ferritic-austenitic (duplex) stainless steels
GB/T 5777, Automated full peripheral ultrasonic testing of seamless and welded
(except submerged arc-welded) steel pipes for the detection of longitudinal and/or
transverse imperfections
GB/T 6394, Determination of estimating the average grain size of metal
GB/T 7735, Automated eddy current testing of seamless and welded (except
submerged arc-welded) steel pipes for detection of imperfections
GB/T 10561-2023, Determination of content of nonmetallic inclusions in steel -
Micrographic method using standard diagrams
GB/T 11170, Stainless steel -- Determination of multi-element contents -- Spark
discharge atomic emission spectrometric method (Routine method)
GB/T 17395, Dimensions, shapes, masses and tolerances of steel pipes
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 20124, Steel and iron -- Determination of nitrogen content -- Thermal
conductimetric method after fusion in a current of inert gas
GB/T 30062, Terminology of steel pipes and pipes
YB/T 4395, Steel. Determination of molybdenum, niobium and tungsten contents.
Inductively coupled plasma atomic emission spectrometric method
YB/T 4396, Stainless steel. Determination of multi-element contents. Inductively
coupled plasma atomic emission spectrometric method
3 Terms and definitions
For the purposes of this document, the following terms and definitions defined in GB/T
30062 apply.
4 Classification and code
4.1 Steel pipes are classified and coded according to their manufacturing method as
follows.
a) Cold-rolled (drawn) steel pipes, coded as W-C;
b) Hot-rolled (extruded, forged, expanded) steel pipes, coded as W-H.
4.2 Steel pipes are classified and coded according to dimensional accuracy as follows.
a) Ordinary grade, coded as PA;
b) High grade, coded as PC.
4.3 The following symbols apply to this document.
D. Outer diameter (unless otherwise specified, includes nominal outer diameter and/or
calculated outer diameter, in millimeters).
Dc. Calculated outer diameter (outer diameter calculated from nominal inner diameter
and nominal wall thickness, in millimeters).
d. Nominal inner diameter (in millimeters).
S. Wall thickness (unless otherwise specified, includes nominal wall thickness and/or
average wall thickness, in millimeters).
Sc. Average wall thickness (the average of the maximum and minimum wall thickness
values calculated from the minimum wall thickness and its allowable deviation, in
millimeters).
Smin. Minimum wall thickness (in millimeters).
Sc. Average wall thickness (the average of the maximum and minimum wall thickness
values calculated from the minimum wall thickness and its allowable deviation, in
millimeters).
5 Ordering content
The contract or order for steel pipes under this document shall include the following.
a) Reference to this document;
b) Product name;
c) Steel designation or unified numerical designation;
d) Dimensions;
e) Ordered quantity (total weight, total length, or number of pieces);
f) Delivery condition;
g) Special requirements.
6 Manufacturing process
6.1 Steel smelting methods
Steel shall be smelted using an electric arc furnace with external refining, a converter
with external refining, or an electroslag remelting method. Other smelting methods with
higher requirements may be used upon negotiation between the supplier and the
purchaser and as specified in the contract.
6.2 Steel pipe manufacturing method
Steel pipes shall be manufactured seamlessly by cold rolling (drawing) or hot rolling
(extrusion, forging, expansion). If the purchaser specifies a particular manufacturing
method, this shall be stated in the contract.
6.3 Delivery state
6.3.1 Steel pipes should be delivered in a heat-treated and pickled state. Steel pipes that
have been through integral grinding, boring, or heat-treated in a protective atmosphere
may be delivered without pickling. The recommended heat treatment schedule for steel
pipes is shown in Table 1.
6.3.2 For hot-rolled (extruded) austenitic stainless steel pipes, if the steel pipes are
directly water-cooled or rapidly cooled by other means within the heat treatment
temperature range specified in Table 1 after final thermal deformation, they shall be
considered to meet the heat treatment requirements.
6.3.3 Upon request from the purchaser, after negotiation between the supplier and the
purchaser, and with this information specified in the contract, cold-rolled (drawn)
austenitic stainless steel pipes may be delivered in the cold-worked state. Requirements
for bendability, mechanical properties, and flattening tests shall be determined by
negotiation between the supplier and the purchaser.
6.3.4 After negotiation between the supplier and the purchaser and with indication in
the contract, the steel pipe may adopt other heat treatment systems other than those
listed in Table 1.
7 Technical requirements
7.1 Steel designation and chemical composition
7.1.1 The steel designation and chemical composition (melting analysis) shall comply
with the provisions of Table 2.Based on the purchaser's requirements, after consultation
between the supplier and the purchaser, and with indication in the contract, steel pipes
with designations or chemical compositions other than those specified in Table 2 may
be supplied.
7.1.2 If the purchaser requires analysis of finished products, this should be stated in the
contract. The allowable deviation of the chemical composition of finished steel pipes
should comply with the provisions of GB/T 222.
Where,
W - Theoretical weight per meter of steel pipe, in kilograms per meter (kg/m);
π - 3.1416;
ρ - Density of steel, in kilograms per cubic decimeter (kg/dm³). Steel density is as
specified in Table 1;
S - Nominal wall thickness or average wall thickness (when delivered at the minimum
wall thickness) of the steel pipe, in millimeters (mm);
D - Nominal outer diameter or calculated outer diameter (when delivered at the nominal
inner diameter) of the steel pipe, in millimeters (mm).
7.9.6.2 For steel pipes delivered according to minimum wall thickness, the theoretical
weight shall be calculated using the average wall thickness. For steel pipes delivered
according to nominal inner diameter, the theoretical weight shall be calculated using
the outer diameter.
7.9.6.3 When steel pipes are delivered according to theoretical weight, the supplier and
the purchaser may negotiate the allowable weight deviation and specify it in the contract.
8 Specimens
8.1 Tensile test specimen
8.1.1 For steel pipes with a diameter of D < 219 mm, samples for the tensile test should
be taken along the longitudinal direction of the steel pipe.
8.1.2 For steel pipes with a diameter of D ≥219 mm, when the pipe size permits, a
circular cross-section specimen with a diameter of 10 mm shall be cut from the
transverse direction of the pipe for the tensile test. If the pipe size is insufficient to allow
for a 10 mm specimen, a transverse circular cross-section specimen with a diameter of
8 mm or 5 mm, whichever is larger, shall be used. If the pipe size is insufficient to allow
for a 5 mm circular cross-section specimen, the tensile test shall be conducted by
sampling along the longitudinal direction of the pipe. Transverse circular cross-section
specimens shall be taken from un-flattened sample blanks.
8.2 Impact test specimen
For impact test, specimens should preferably be cut transversely along the steel pipe. If
transverse specimens are not possible, specimens should be cut longitudinally.
Regardless of whether the specimens are cut transversely or longitudinally, the impact
specimens should be the larger of the standard sizes and thicknesses of 7.5 mm, 5 mm,
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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