BS/EN 12449-2016 pdf download.Copper and copper alloys Seamless round tubes for general purposes.
For coiled tubes with wall thicknesses up to and including 2 mm, except for tubes with ratios of outside diameter to wall thickness greater than 20, the deviation from circular form is included in the tolerances on diameter given in Table 21.
6.3.5.2 Straightness
Tubes in straight lengths, except for those in the annealed condition (see Tables 9 to 15) or with outside diameter equal to or less than 10 mm, shall conform to the tolerances given in Table 22.
6.4 Surface quality
The external and internal surfaces shall be clean and smooth.
The tubes may have a superficial film of drawing lubricant or, if annealed or thermally stress relieved, a superficial, dull, iridescent oxide film, securely adherent on both the internal and external surfaces.
Discontinuous irregularities on the external and internal surfaces of the tubes are permitted if they are within the dimensional tolerances.
Special requirements (e.g. pickling, degreasing, etc.) relating to the surface quality shall be agreed between the purchaser and the supplier [see Clause 5, list entry p)J.
If deburring of the cut ends of the tubes is required it shall be agreed between the purchaser and the supplier [see Clause 5, list entry o)j.
6.5 Technological requirements
6.5.1 Drift expanding
No crack shall be visible to the unaided eye, corrected for normal vision if necessary, when tubes in the annealed condition and outside diameter up to and including 100 mm and when agreed between the purchaser and the supplier [see Clause 5, list entry k)] are tested in accordance with 8.4.1.
6.5.2 Residual stress level
No crack shall be visible to the unaided eye, corrected for normal vision if necessary, when tubes in the stress relieved condition and when requested by the purchaser [see Clause 5, list entry I)] are tested in accordance with 8.4.2.
6.5.3 Grain size
The average grain size of tubes in the annealed condition, when requested by the purchaser, [see Clause 5, list entry m)j shall conform to the limits agreed between the purchaser and the supplier. The test shall be carried out in accordance with 8.4.3.
7.1 General
When required (e.g. if necessary in accordance with specified procedures of a supplier’s quality system, or when the purchaser requests inspection documents with test results, or for use in cases of dispute), an inspection lot shall be sampled in accordance with 7.2 and 7.3.
7.2 Analysis
The sampling rate shall be in accordance with Table 23. A test sample, depending on the analytical technique to be employed, shall be prepared from each sampling unit and used for the determination of the composition.
When preparing the test sample, care should be taken to avoid contaminating or overheating the test sample. Carbide tipped tools are recommended; steel tools, if used, should be made of magnetic material to assist in the subsequent removal of extraneous iron. If the test samples are in finely divided form (e.g. drillings, millings), they should be treated carefully with a strong magnet to remove any particles of iron introduced during preparation.
In cases of dispute concerning the results of analysis, the full procedure given in iSO 1811-2 should be followed.
Results may be used from analyses carried out at an earlier stage of manufacturing the product, e.g. at the casting stage, if the material identity is maintained and if the quality management system of the manufacturer is certified, e.g. as conforming to EN ISO 9001.
7.3 Mechanical tests and stress corrosion resistance test
The sampling rate shall be in accordance with Table 23. Sampling units shall be selected from the finished products. The test samples shall be cut from the sampling units. Test samples, and test pieces prepared from them, shall not be subjected to any further treatment, other than any machining operations necessary in the preparation of the test pieces.
8 Test methods
8.1 Analysis
Analysis shall be carried out on the test pieces, or test portions, prepared from the test samples obtained in accordance with 7.2. Except in cases of dispute, the analytical methods used shall be chemical or spectrographic according to EN or ISO standards in force. For expression of results, the rounding rules given in 8.7 shall be used.
In cases of dispute concerning the results of analysis, the method of analysis to be used should be chemical.BS/EN 12449-2016 pdf download.