GB/T 14975-2025 PDF English
US$335.00 · In stock · Download in 9 secondsGB/T 14975-2025: Seamless stainless steel tubes for structure Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 14975: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14975-2025 | English | 335 |
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Seamless stainless steel tubes for structure
| Valid |
| GB/T 14975-2012 | English | 155 |
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Seamless stainless steel tubes for structure
| Valid |
| GB/T 14975-2002 | English | 70 |
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Stainless steel seamless tubes for structures
| Obsolete |
| GB/T 14975-1994 | English | 479 |
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Stainless steel seamless tubes for structures
| Obsolete |
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GB/T 14975-2025: Seamless stainless steel tubes for structure---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/GBT14975-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 14975-2012
Seamless stainless steel tubes for structure
Issued on: AUGUST 29, 2025
Implemented on: MARCH 01, 2026
Issued by. Status Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 7
4 Classification and codes... 8
5 Ordering details... 8
6 Manufacturing process... 9
6.1 Steelmaking method... 9
6.2 Steel tube manufacturing method... 9
6.3 Delivery condition... 9
7 Technical requirements... 12
7.1 Steel designations and chemical composition... 12
7.2 Mechanical properties... 16
7.3 Process performance... 17
7.4 Hydraulic pressure... 18
7.5 Intergranular corrosion... 19
7.6 Surface quality... 19
7.7 Dimensions, shape, weight... 19
8 Test methods... 23
9 Inspection rules... 23
9.1 Inspection and acceptance... 23
9.2 Group-batching rules... 24
9.3 Sampling quantity... 24
9.4 Re-inspection and judgement rules... 24
10 Packaging, marking, quality certificates... 24
Seamless stainless steel tubes for structure
1 Scope
This document specifies the classification and codes, ordering details, manufacturing
process, technical requirements, test methods, inspection rules, packaging, marking,
quality certification for seamless stainless steel tubes for structure.
This document applies to seamless stainless steel tubes for general structures or
mechanical structures (hereinafter referred to as tubes).
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references herein. For referenced documents with dates,
only the versions corresponding to those dates apply to this document; for referenced
documents without dates, the latest versions (including all amendments) apply to this
document.
GB/T 222 Steels and alloys - Permissible deviations of product analyzed chemical
composition
GB/T 223.4 Iron, steel and alloy - Determination of manganese content -
Potentiometric or visual titration method
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
4 Classification and codes
4.1 Steel tubes are classified into two categories based on the product processing
method. Their classifications and codes are as follows.
a) Cold-rolled (drawn) steel tubes, code W-C;
b) Hot-rolled (extruded, forged, expanded) steel tubes, code W-H.
4.2 Steel tubes are classified into two grades based on dimensional accuracy. Their
grades and codes are as follows.
a) Ordinary grade, code PA;
b) High grade, code PC.
4.3 The following symbols apply to this document.
D. Outer diameter (unless otherwise specified, including nominal outer diameter
and/or calculated outer diameter, in millimeters)
Dc. Calculated outer diameter (outer diameter calculated as the sum of 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
thicknesses, as calculated based on the minimum wall thickness and its allowable
deviation, in millimeters)
Smin. Minimum wall thickness (in millimeters)
5 Ordering details
Contracts or orders for steel tubes in accordance with this document shall include the
following.
a) This document number;
b) Product name;
c) Steel designation or unified numerical code;
d) Dimensions;
e) Ordered quantity (total weight or total length);
f) Delivery condition;
g) Special requirements.
6 Manufacturing process
6.1 Steelmaking method
Steel shall be smelted using an electric arc furnace with external refining, a converter
with external refining, or electroslag remelting. Other smelting methods may be used
upon agreement between the supplier and the purchaser and as specified in the contract.
6.2 Steel tube manufacturing method
Steel tubes shall be manufactured seamlessly using the cold rolling (drawing) or hot
rolling (extrusion, forging, expansion) method. If the purchaser specifies a specific
manufacturing method, this shall be specified in the contract.
6.3 Delivery condition
6.3.1 Steel tubes shall be delivered in a heat-treated and pickled state. Steel tubes that
have been subjected to integral grinding, boring, or protective atmosphere heat
treatment may be delivered without pickling. Recommended heat treatment schedules
for steel tubes are shown in Table 1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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