GB/T 23609-2023 (English Version)

Standard No.: GB/T 23609-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 23609-2023
Replace: GB/T 23609-2009

Scope: This document specifies the classification and marking, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, accompanying documents and order form contents of copper alloy seamless pipes for seawater desalination equipment (hereinafter referred to as "pipes"). This document is applicable to copper alloy seamless pipes for seawater desalination equipment, and copper alloy seamless pipes for other desalination equipment can be used as a reference.

Introduction

1. Background and significance of standard revision

GB/T 23609-2023 "Copper alloy seamless pipes for seawater desalination equipment" is a comprehensive revision of the original standard GB/T 23609-2009, which mainly optimizes and improves the technical development and application needs in the field of seawater desalination.

2. Comparison of standard frameworks

Standard dimensions	Requirements of the 2009 edition	New requirements of the 2023 edition
Chemical composition	Conforms to the corresponding provisions of GB/T5231	New grade BFe10-1.5-1 and its state
Allowable deviation of outer diameter	±0.08mm	The deviation of some specifications is relaxed to ±0.23mm
Mechanical properties	Tensile strength not less than 340MPa	New tensile strength up to 480MPa

3. Technical requirements interpretation

Chemical composition control

GB/T23609-2023 clearly requires that the chemical composition of pipes must comply with the provisions of GB/T5121, and adds the BFe10-1.5-1 grade and its state. This change is mainly aimed at the higher requirements of seawater desalination equipment for material corrosion resistance and mechanical properties.

Wall thickness tolerance

The wall thickness tolerance of the pipe is ±10% of the nominal wall thickness, accurate to 0.01mm. When the minimum wall thickness is required, the wall thickness of any part should not be less than the specified value.

4. Analysis of New Technical Requirements

Electrochemical Corrosion Performance: A new requirement that the potential difference between the inner and outer surfaces ΔE should not be greater than 0.07V is added to ensure the corrosion resistance of the material in the seawater environment.
Air Pressure Test Method: Two new test methods are added to ensure that there are no bubbles or changes in the internal pressure of the pipe.
Residual Carbon Control: The residual carbon content on the inner surface is strictly controlled within 0.2mg/m² to avoid water pollution.

5. Implementation Suggestions

To ensure the effective implementation of the standard, it is recommended that:

Both the supply and demand sides should strictly follow the standard requirements for production and inspection.
Manufacturing enterprises need to strengthen the quality control of raw materials and semi-finished products.
Users should clearly specify the test items when purchasing and keep relevant test reports.

GB/T 23609-2023 Referenced Document

GB/T 241 Metal materials-Tube.Hydrostatic pressure test
GB/T 242 Metal materials.Tube.Drift-expending test
GB/T 246 Metallic materials—Tube—Flattening test
GB/T 26303.1 Measuring method for dimensions and shapes of wrought copper and copper alloy.Part 1: Tube
GB/T 2828.1 Inspection procedure by count sampling part 1: Lot by lot inspection sampling plan retrieved by acceptance quality limit (AQL)
GB/T 33817 Method for determination of the carbon content on the inner surface of copper and copper-alloy tube
GB/T 34505-2017 Copper and copper alloy materials—Tensile testing at room temperature
GB/T 4340.1 Vickers hardness test for metallic materials Part 1: Test method*， 2024-05-28 Update
GB/T 5231 Designation and chemical composition of wrought copper and copper alloys
GB/T 5248 Copper and copper alloy seamless pipe eddy current flaw detection method
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 8888 Wrough heavy non-ferrous metal products-packing,marking, transportation, storing and cetificate of quality
YS/T 347 Method for determination of average grain size of copper and copper alloys
YS/T 482 Analysis methods for copper and copper alloys Spark discharge atomic emission spectrometry
YS/T 483 Analysis methods for copper and copper alloys X-ray fluorescence spectrometry (wavelength dispersion type)
YS/T 668 Sampling methods for physical and chemical testing of copper and copper alloys

GB/T 23609-2023 history

2023 GB/T 23609-2023 Copper alloy seamless pipe for seawater desalination plant
2009 GB/T 23609-2009 Seamless copper alloy tube for water desalting applications