GB/T 10573-2020Tensile testing method for fine wire of nonferrous metals (English PDF)

1 Scope

GB/T 10573-2020 is the Chinese national standard on tensile testing method for fine wire of nonferrous metals, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 29 September 2020 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 August 2021. Classification: ICS 77.040.10, CCS H22. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Standard specifies method summary, instruments and equipment, specimen, test requirements, test steps, test data processing and test report of tensile testing method for fine wire of nonferrous metals. This Standard is applicable to determination of tensile mechanical properties at room temperature of fine wire of nonferrous metals of which the nominal diameter is not more than 0.25mm or cross-sectional area is not more than 0.0491mm2.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 8170, Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 10623, Metallic material - Mechanical testing - Vocabulary

GB/T 15077, Geometric size measuring methods of precious metals and their alloy materials JJG 139, Verification Regulation of Universal Tension and Compression Testing Machine

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB/T 10623 as well as the followings apply.

3.1 proof force of total elongation; Ft the force used to make the total extension (including elastic extension and

6 Instruments and equipment

6.1 The measurement error of the testing machine complies with the relevant regulations in JJG 139. The accuracy of the force value shall be level 1 or better.

6.2 The testing machine shall be calibrated or verified regularly. The force value range used in the test shall be within the tested range.

7 Specimen

7.1 Specimens shall be taken at least 300mm from the end of the wire. The spacing between each specimen shall not be less than 300mm.

7.2 The original gauge length of the specimen, L0, shall be 100mm. When there are other requirements, it can be 200mm or 50mm. When it is not necessary to determine the percentage extension, the original gauge length L0 of the specimen shall be 50mm.

7.3 The total length of the specimen shall be determined according to the original gauge length of the specimen and the length of the clamping end.

7.4 The specimen shall not have mechanical damage and bending that affect the test result.

8 Test requirements

8.1 Test temperature The test is generally carried out in the room temperature range of 10°C~35°C. For tests with strict temperature requirements, the test temperature shall be 23°C ± 5°C.

8.2 Chuck spacing The spacing between the two chucks of the testing machine is L0±0.5mm.

8.3 Specimen processing When clamping the specimen, keep the specimen free droop and straight. Apply pre-tension to the specimen if necessary. Its size generally does not exceed 5% of the maximum force of the wire. It may also stick the tested specimen on the straight line at both ends of the paper frame. The bonding length h and paper frame width b are determined by the size of the chuck, as shown in Figure 1. Cut the paper frame after the specimen is installed. Where, S0 - Original cross-sectional area of the specimen, in square millimeters (mm2); d0 - Original diameter of the specimen, in millimeters (mm).

9.1.2 For wires with a nominal diameter of not more than 0.1mm, measure the cross-sectional area of specimen S0 according to the weighing method specified in GB/T 15077.

9.1.3 If allowed by relevant standards or agreements, the nominal size can also be used to calculate the original cross-sectional area of the wire specimen.

9.1.4 The calculation of the original cross-sectional area of the specimen is rounded to three significant figures. The rounding method is carried out according to GB/T 8170.

9.1.5 Without the need to determine the strength index, the cross-sectional area of the specimen may not be measured.

9 Test steps...

11 Test report

The test report shall contain the following information:

a) Reference to this Standard;

c) Material designation, state, specification and batch number;

d) Specimen identifier;