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GB/T 32569-2016Welded stainless steel tubes for seawater desalination plants (English PDF)

海水淡化装置用不锈钢焊接钢管

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

February 24, 2016

Implementation date

January 1, 2017

Scope

GB/T 32569-2016 is the English-translated version of 海水淡化装置用不锈钢焊接钢管.

GB/T 32569-2016 is the Chinese standard "Welded stainless steel tubes for seawater desalination plants".

Its scope clause reads: 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. Its clauses include order contents; dimension, shape and tolerance; technical requirements; test methods; inspection rules; packaging, symbols and quality certificate.

It was issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on FEBRUARY 24, 2016 and took effect on JANUARY 1, 2017.

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Document preview — GB/T 32569-2016

National Standard of the People's Republic of China

ICS: 77.140.75
Classification: H 48

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative references4
3 Order contents7
4 Dimension, shape and tolerance7
5 Technical requirements8
6 Test methods14
7 Inspection rules15
8 Packaging, symbols and quality certificate16

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

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 alpha-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 Dimension, shape and tolerance

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. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223.16 · GB/T 223.58

Cited by

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