GB/T 27671-2023Copper profiles for electrical purposes (English PDF)

3.1 Coiled

A whole piece of profile wound into a series of adjacent coils.

3.2 Pancake

A single-layer profile wound into a disc shape by spiral winding, a coiled profile shaped like a mosquito-repellent coil.

3.3 Traverse wound

A coiled profile with each turn wound into a layer parallel to the coiled profile, so that the adjacent turns in any layer are close to each other.

3.5 On spools

A shaft made of steel, wood, plastic and other materials, on which the profile is regularly wound layer by layer in a certain winding direction.

4.1 Product classification

4.1.1 The classification, designation, code, state and supply form of profiles shall comply with the provisions of Table 1.

4.2 Product marking

Profile marking is indicated in the order of product name, serial number of this document, designation (or code), state, length and drawing number. Straight-strip profiles are directly marked with length dimensions. The marking examples are as follows. […]

5.1 Chemical composition

The chemical composition of TAg0.04, TAg0.07, TAg0.04-0.004, TAg0.07-0.004, TAg0.1-0.004 profiles shall comply with the provisions of Table 3, and the chemical composition of profiles of other designations shall comply with the corresponding provisions in GB/T 5231.

5.2 Dimensions and their allowable deviations

5.2.1 Dimensions of cross section

5.2.1.1 The allowable deviation of dimensions of the cross section of profiles in M30 state shall be agreed by the supplier and purchaser.

5.2.4 Fillet radius of edges and corners

The maximum fillet radius of edges and corners of profiles shall comply with the provisions of Table 9.

5.2.6 Length

Both ends of profiles shall be sawed flat. The irregular length of straight-strip profiles is 500 mm ~ 8500 mm, the fixed length or multiple length shall be within the irregular length range, and the allowable deviation of fixed length or multiple length shall comply with the provisions of Table 11.

5.2.7 Cutting bevel

Under the condition that the allowable deviation of fixed length is not exceeded, the cutting bevel of the end face of a profile shall not be greater than 1.5 % of the larger value of the maximum width (Wmax) or the maximum height (hmax) of the profile.

5.2.8 Geometric tolerance

5.4 Electrical properties

The electrical properties of profiles at 20 °C shall comply with the requirements of Table 14.

6.1 Chemical composition

The chemical composition analysis method for profiles shall be carried out in accordance with the provisions of GB/T 5121 (all parts) and YS/T 482. The arbitration test method shall be carried out in accordance with the provisions of GB/T 5121 (all parts).

6.2 Dimensions and their allowable deviations

6.3.2 Hardness test

The Brinell hardness test method for profiles shall be carried out in accordance with the provisions of GB/T 231.1; the Vickers hardness test method for profiles shall be carried out in accordance with the provisions of GB/T 4340.1.

6.4 Electrical properties

The test method for electrical properties of profiles shall be carried out in accordance with the provisions of GB/T 3048.2 and GB/T 32791, the arbitration test method shall be carried out in accordance with the provisions of GB/T 3048.2, and the electrical conductivity corresponding to the resistivity is shown in Annex A. The electrical properties test pieces shall be processed into samples that meet the requirements of GB/T 3048.2.

6.5 Hydrogen embrittlement test

The hydrogen embrittlement test method for profiles shall be carried out in accordance with the provisions of GB/T 23606.

7.1 Inspection and acceptance

7.1.1 Profiles shall be inspected by the supplier or a third party to ensure that the product quality meets the requirements of this document and the order form.

7.2 Batch grouping

Profiles shall be submitted for inspection in batches. Each batch shall consist of profiles of the same designation, state, specification or drawing number. The mass of each batch shall not exceed 2000 kg.

7.3 Inspection items

The inspection items of profiles are divided into factory-exit inspection items and type inspection items, see Table 16. Type inspection shall be carried out in any of the following situations.

7.4 Sampling

The sampling of profiles shall comply with the provisions of Table 17. The sampling method shall be carried out in accordance with the provisions of YS/T 668.

7.5 Determination of test results

7.5.1 The numerical value of the test results shall be rounded off according to the provisions of GB/T 8170, and the rounded value comparison method shall be used for determination.

7.5.2 When the chemical composition is unqualified, the batch of profiles is determined to be unqualified.

7.5.3 When the dimensions and their allowable deviations and surface quality of the profile are unqualified, the piece or the coil is determined to be unqualified. When the number of unqualified pieces in each batch exceeds the acceptance quality limit, the entire batch is determined to be unqualified, and the supplier shall inspect each piece or coil, and determine piece by piece or coil by coil.

8.1 Marking, packaging, transportation, storage

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

8.2 Accompanying documents

Each batch of products shall be accompanied by accompanying documents, which shall include supplier information, product information, serial number of this document, factory-exit date or packaging date, and should hall also include.