GB/T 26024-2021Seamless copper and copper alloys tube for valves on air-conditioning and refrigeration system (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1. Structure and Drafting Rules of Standardization Documents" drafted.

This document replaces GB/T 26024-2010 "Copper and Copper Alloy Seamless Tubes for Valves of Air-conditioning and Refrigeration Systems", and GB/T 26024- Compared with:2010, except for structural adjustment and editorial changes, the main technical changes are as follows:

a) The representation method of pipe material code is added (see 4.1);

b) Changed the state representation method (see 4.1, 3.1.1 of the:2010 edition);

c) Changed the specification range of TP2 straight pipe, and changed the inner diameter range from "2.0mm~95.0mm" to "2.0mm~ 100.0mm"; change the outer diameter range from "4.0mm~100.0mm" to "3.0mm~105.0mm"; change the wall thickness range from Change "0.5mm~2.0mm" to "0.5mm~2.5mm"; change the length range from "100mm~6000mm" to "1000mm~6000mm" (see 4.1, 3.1.1 of the:2010 edition);

d) Changed the specification range of TP2 coil, and changed the outer diameter range from "4.0mm~22.0mm" to "4.0mm~ 24.0mm"; the lower limit of the length of the TP2 coil is added ">=15000mm" (see 4.1, 3.1.1 of the:2010 edition);

e) Changed the specification range of H65 straight pipe, and changed the inner diameter range from "14.0mm~42.0mm" to "14.0mm~ 105.0mm"; change the outer diameter range from "20.0mm~45.0mm" to "16.6mm~113.0mm"; change the wall thickness range Change from "1.5mm~3.0mm" to "1.3mm~4.0mm"; change the length range from "100mm~6000mm" is "100mm~3000mm" (see 4.1, 3.1.1 of the:2010 edition);

f) Deleted the residual stress test method for H65 pipes. mercurous nitrate test method (see 4.5.1 of the:2010 edition);

g) Changed the inclination of the straight pipe with an outer diameter greater than 50mm, and changed "2.5% of the outer diameter" to "2.0% of the nominal outer diameter" (see 5.2.3, 3.3.3 of the:2010 version);

h) The maximum arc depth of 100mm~200mm for H65 straight pipe length is 0.20mm, and the maximum for >=200mm~400mm Arc depth 0.35mm (see 5.2.5);

i) Changed the tensile strength of TP2 grade O60 state, changed ">=205MPa" to ">=215MPa" (see 5.3,:2010 edition 3.4);

j) Changed the measurement method of size, clarified that the measurement method of pipe size and its allowable deviation should be in accordance with GB/T 26303.1 The straightness inspection of the H65 pipe whose length is less than 400mm is carried out with a feeler gauge (see 6.2, 4.2 of the:2010 edition);

k) Changed the grain size of TP2 grade O60 state, changed "0.025mm~0.060mm" to "0.015mm~0.060mm" (see 5.5, 3.7 of the:2010 edition);

l) Modified the tensile test method and changed the tensile test method GB/T 228-2002 to GB/T 34505-2017 (see 6.3, 4.3 of the:2010 edition).

1 Scope

This document specifies the classification, marking and technical requirements of copper and copper alloy seamless pipes (hereinafter referred to as "pipes") used in air conditioning and refrigeration system valves. requirements, test methods, inspection rules, markings, packaging, transportation, storage, accompanying documents and the contents of the order form.

This document applies to the use of copper and copper alloys without the Sewing tube.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 242 Metal Pipe Flaring Test Method

GB/T 2828.1 Counting Sampling Inspection Procedure Part 1. Lot-by-Lot Inspection Sampling Plan Retrieved by Acceptance Quality Limit (AQL)

GB/T 5121 (all parts) Methods for chemical analysis of copper and copper alloys

GB/T 5231 Processed copper and copper alloy grades and chemical composition

GB/T 5248-2016 Eddy current flaw detection method for copper and copper alloy seamless pipes

GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values

GB/T 8888 Packaging, marking, transportation, storage and quality certificate of heavy non-ferrous metal processing products

GB/T 10567.2 Test method for residual stress of copper and copper alloy processed materials Ammonia fumigation test method

GB/T 26303.1 Copper and copper alloy processing materials external dimension testing method - Part 1. Pipe

GB/T 34505-2017 Room temperature tensile test method for copper and copper alloy materials

YS/T 347 copper and copper alloy average grain size determination method

YS/T 482 Analysis method of copper and copper alloy Photoemission spectrometry

YS/T 483 Analysis method of copper and copper alloy X-ray fluorescence spectrometry (wavelength dispersion type)

YS/T 668 Sampling method for physical and chemical testing of copper and copper alloys Preparation method of YS/T 815 copper and copper alloy mechanical properties and process performance samples

3 Terms and Definitions

There are no terms and definitions that need to be defined in this document.

4 Classification and marking