GB/T 42512-2023Copper alloy seamless coil tube for sheaths (English PDF)

6.3 Mechanical properties

6.3.1 The tensile test of the tube shall be carried out in accordance with the provisions of GB/T 34505-2017. The tensile test specimens with an outer diameter of the tube less than or equal to 30mm shall be carried out in accordance with the provisions of full-section specimens specified in GB/T 34505-2017. For the tube with outer diameter greater than 30mm, it shall be carried out according to the provisions of S1 specimen specified in GB/T 34505-2017.

6.3.2 The hardness test method of the tube shall be carried out in accordance with the provisions of GB/T 4340.1.

6.4 Volume resistivity The measurement method of the volume resistivity of the tube shall be carried out according to the method specified in GB/T 3048.2.

6.5 Process performance

6.5.1 The drift-expanding test of the tube shall be carried out in accordance with the provisions of GB/T 242.

6.5.2 The flattening test of the tube shall be carried out in accordance with the provisions of GB/T 246.

6.6 Grain size The grain size inspection of the tube shall be carried out in accordance with the provisions of YS/T 347.

6.7 Environmental requirements The detection of harmful substance content in the tube shall be carried out in accordance with the provisions of GB/T 26125.

6.8 Residual stress The residual stress test of the tube shall be carried out in accordance with the provisions of GB/T 10567.2.

6.9 Surface quality The surface quality of the tube is inspected visually.

7.1 Inspection and acceptance

7.1.1 Tubes shall be inspected by the supplier or a third party to ensure that the product quality complies with the provisions of this Document and the requirements of the order form.

7.1.2 The purchaser may inspect the received products in accordance with the provisions of this Document. If the inspection results are inconsistent with the provisions of this Document and the requirements of the order form, it shall be submitted to the supplier in written, and the purchaser and the supplier shall negotiate and resolve. Objections related to surface quality and dimensions shall be raised within 1 month from the date of receipt of the product. Objections related to other performance shall be raised within 3 months from the date of receipt of the product. If arbitration is needed, it shall be determined by both the supplier and the purchaser through joint sampling or negotiation on the supplier side.

7.2 Batching Tubes shall be submitted for acceptance in batches. The weight of each batch of tubes shall not exceed 5000kg.

7.3 Inspection Product inspection items are divided into exit-factory inspection and type inspection, which shall comply with the provisions of Table 7. When any of the following situations occurs, type inspection shall be carried out:

a) Trial prototype identification of new products or old products transferred to other factories;

b) When there are major changes in the raw materials and processes of the product, which may affect product performance;

c) After the product is discontinued, when production is resumed;

d) When the exit-factory inspection results are significantly different from the last type inspection;

e) When type inspection has not been carried out for two consecutive years;

f) When required by the purchaser (specified in the order form);

g) When the national quality supervision agency requests type inspection.

8.1 Marking

8.1.1 Product marking Tubes that have passed the inspection shall have the following marks (or labels):

a) Product label;

b) Batch number;

c) Date of production;

8.1.2 Packaging marking The marking of packaging box of tubes shall comply with the provisions of GB/T 8888.

8.2 Packaging, transportation and storage

8.2.1 The packaging, transportation and storage of tubes shall comply with the provisions of GB/T 8888.

8.2.2 If there are special requirements for packaging methods, they shall be determined through negotiation between the supplier and the purchaser.

8.3 Accompanying document Each batch of products shall be accompanied by accompanying documents, which shall include the following information, in addition to supplier information, product information, this document number, exit-factory date or packaging date.