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Welded stainless steel tubes for seawater desalination plants
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GB/T 32569-2016: PDF in English (GBT 32569-2016) GB/T 32569-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
H 48
Welded stainless steel tubes for
seawater desalination plants
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JANUARY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Order contents ... 7
4 Dimension, shape and tolerance ... 7
5 Technical requirements ... 8
6 Test methods ... 14
7 Inspection rules ... 15
8 Packaging, symbols and quality certificate ... 16
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the National Technical
Committee for Standardization of Steels (SAC/TC 183).
Drafting organizations of this Standard. Hunan Xiangtou Goldsky New Materials
Co., Ltd, Shandong Taishan Iron and Steel Group Co., Ltd, Jiangsu Wujin
Stainless Steel Pipe Group Co., Ltd, Chengdu Common Tube Group Co., Ltd,
Shanxi Taigang Stainless Steel Co., Ltd, and Hunan Green & Innovative
Materials Co., Ltd.
Main drafters of this Standard. Xie Yi, Li Jianfei, Qi Haiyan, Song Jianxin, Wen
Changhong, Kang Xitang, Yan Xinliang, Yue Weiheng and Li Huaize.
Welded stainless steel tubes for
seawater desalination plants
1 Scope
This Standard specifies the dimension, shape, tolerance, technical
requirements, test methods, inspection rules, packaging, symbols and quality
certificate of the welded stainless steel tubes for seawater desalination plants
(hereinafter referred to as “steel tubes”).
This Standard is applicable to the welded stainless steel tubes for the heat
exchangers of seawater desalination plants.
2 Normative references
The following documents are essential to the application of this document. For
dated references, only the editions with the dates indicated are applicable to
this document. For undated references, only the latest editions (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 -
Chrom azurol S photometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content -
Visual titration or potentiometric titration method
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The
chromotropic acid photometric method for the determination of titanium
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 223.28 Methods for chemical analysis of iron, steel and alloy - The α-
benzoinoxime gravimetric method for the determination of molybdenum
content
GB/T 223.30 Methods for chemical analysis of iron, steel and alloy - The
arsenazo III spectrophotometric method for the determination of zirconium
content after separation by p-bromomandelic acid
GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The
indophenol blue photometric method for the determination of nitrogen
content after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the
sulphochlorophenol S spectrophotometric method
GB/T 223.43 Iron, steel and alloy - Determination of tungsten content -
Gravimetric method and 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 223.59 Iron, steel and alloy - Determination of phosphorus content -
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The
perchloric acid dehydration gravimetric method for the determination of
silicon 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 223.69 Iron, steel and alloy - Determination of carbon contents - Gas-
volumetric method after combustion in the pipe furnace
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content -
Gravimetric method
4.1.3 According to the requirements of the demander, after the consultation
between supplier and demander, and making indications in the contract, it is
allowed to supply the steel tubes with other outer diameters, wall thicknesses
and tolerances.
4.2 Out-of-roundness
For the steel tubes, the out-of-roundness shall not exceed 75% of the tolerance
of the nominal outer diameter. However, for the thin-walled steel tubes whose
ratio OF wall thickness TO outer diameter is not greater than 3%, the out-of-
roundness shall not exceed 2% of the nominal outer diameter.
4.3 Bending
The bending of steel tubes shall not be greater than 1.5 mm/m.
4.4 End shape
The end faces on both sides of each steel tube shall be perpendicular to the
steel tube’s axis. Furthermore, REMOVE the burrs at the notches.
5 Technical requirements
5.1 Designations and chemical compositions of steels
5.1.1 The designations and chemical compositions (smelting analysis) of
steels shall conform to the provisions of Table 2. According to the requirements
of the demander, after the consultation between supplier and demander, and
making indications in the contract, it is allowed to supply the steel tubes with
other designations and chemical compositions.
5.1.2 The tolerances for the chemical compositions of finished steel tubes
shall conform to the provisions of GB/T 222.
5.2 Manufacturing method
5.2.1 Steel tubes shall use rolled steel strips as raw materials, and automatic
welding method without adding any filler metals for manufacture.
5.2.2 According to the requirements of the demander, after the consultation
between supplier and demander, and making indications in the contract, it is
allowed to conduct cold working to the steel tubes’ welding seams and base
metal, or to only conduct cold working to the weld metal after welding and before
final heat treatment.
5.3 Delivery status
S - Nominal wall thickness of the steel tube, in unit of millimeter (mm);
D - Nominal outer diameter of the steel tube, in unit of millimeter (mm);
e - Coefficient of deformation per unit length. For the austenitic steel tubes
and austenitic-ferritic duplex steel tubes, it shall be 0.09. For the ferritic steel
tubes, it shall be 0.08.
5.6.2 Flanging test
Steel tubes shall be conducted with flanging test. During the flanging test, the
flanging width shall not be less than 15% of the outer diameter. After the test,
there shall be no cracks on the test sample.
5.7 Non-destructive testing
Steel tubes shall be conducted with eddy current testing one by one. During the
eddy current testing, the artificial defects of the contrast tube shall conform to
the provisions of the acceptance level B in GB/T 7735-2004.
After the consultation between supplier and demander, and making indications
in the contract, it is allowed to use other non-destructive testing methods.
5.8 Corrosion tests
5.8.1 Intergranular corrosion test
5.8.1.1 Austenitic steel tubes and ferritic steel tubes shall be conducted with
intergranular corrosion test. After the test, the test samples are not allowed to
have corrosion tendency.
5.8.1.2 For the austenitic steel tubes with the nominal outer diameters of less
than 16mm, TAKE 25mm long whole tube section as test sample. CONDUCT
the immersion corrosion according to the provisions of method E in GB/T 4334-
2008. FLATTEN the test sample according to the Step 1 in the provisions of
Section 5.6.1. MAKE evaluation afterwards. For the austenitic steel tubes with
the nominal outer diameters of not less than 16mm, the intergranular corrosion
test methods shall conform to the provisions of method E in GB/T 4334-2008.
5.8.1.3 The ferritic steel tubes with the designations of 022Cr18Ti,
019Cr19Mo2NbTi and 008Cr27Mo shall be conducted with intergranular
corrosion test according to the provisions of GB/T 32571. According to the
requirements of the demander, after the consultation between supplier and
demander, and makin...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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