GB/T 4910-2022 English PDF (GBT4910-2022)

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GB/T 4910-2022: Tinned round copper wire
GB/T 4910-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.10
CCS K 11
Replacing GB/T 4910-2009
Tinned round copper wire
镀锡圆铜线
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Product representation method ... 6
5 Materials ... 7
6 Diameter deviation ... 7
7 Tensile strength and elongation ... 7
8 DC resistivity at 20 ℃ ... 8
9 Coating ... 9
10 Solderability ... 9
11 Requirements for regulated substances ... 10
12 Acceptance rules ... 10
13 Packaging and marking ... 10
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document replaces GB/T 4910-2009 Tinned round copper wire. Compared with
GB/T 4910-2009, in addition to structural adjustments and editorial changes, the main
technical changes of this document are as follows:
-- Amend the normative references (see Chapter 2; Chapter 2 of the 2009 edition);
-- Add the model and specification of tinned hard round copper wire (see 4.1, 4.2);
-- Change the specification range of tinned round copper wire (see 4.2; Chapter 4 of
the 2009 edition);
-- Change the material of tinned round copper wire (see Chapter 5; Chapter 5 of the
2009 edition);
-- Change the diameter deviation of tinned round copper wire (see Chapter 6;
Chapter 6 of the 2009 edition);
-- Add the tensile strength, elongation and DC resistivity at 20°C of tinned hard
round copper wire (see Chapter 7 and Chapter 8);
-- Add the sample gauge length requirements for the elongation test (see 7.2);
-- Change the test method requirements for coating (see Chapter 9; Chapter 9 of the
2009 edition);
-- Change the test method and requirements of solderability (see Chapter 10; Chapter
10 of the 2009 edition);
-- Add requirements for regulated substances of tinned round copper wire (see
Chapter 11);
-- Change the test method corresponding to the inspection item (see 12.2; 11.2 of the
2009 edition).
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document was proposed by China Electrical Equipment Industry Association.
This document shall be under the jurisdiction of National Technical Committee 422 on
Bare Wires of Standardization Administration of China (SAC/TC 422).
Tinned round copper wire
1 Scope
This document specifies the models, specifications, materials, diameter deviation,
mechanical and electrical properties, coating, solderability, requirements for regulated
substances, acceptance rules, packaging and marking of tinned round copper wire.
This document applies to tinned round copper wires for connecting wires, cables and
electronic equipment, including tinned soft round copper wires, solderable tinned soft
round copper wires and tinned hard round copper wires.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable to its application. For dated references, only the version
corresponding to that date is applicable to this document; for undated references, the
latest version (including all amendments) is applicable to this document.
GB/T 728, Tin ingot
GB/T 2423.28-2005, Basic environmental testing procedures for electric and
electronic products - Part 2: Test methods - Test T: Soldering
GB/T 3048.2, Test methods for electrical properties of electric cables and wires. Part
2: Test of electrical resistivity of metallic materials
GB/T 3952, Copper drawing stock for electrical purpose
GB/T 4909.2, Test methods for bare wires - Part 2: Measurement of dimensions
GB/T 4909.3, Test methods for bare wires - Part 3: Tensile test
GB/T 4909.9-2009, Test methods for bare wires - Part 9: Test for continuity of
coating - Sodium polysulfide solution method
GB/T 4909.10, Test methods for bare wires - Part 10: Test for continuity of coating
- Ammonium persulphate solution method
GB/T 4909.11, Test methods for bare wires - Part 11: Test for adherence of coating
GB/T 4909.12, Test methods for bare wires - Part 12: Solderability test of coating -
Solder globule method
GB/T 26125, Electrical and electronic products - Determination of six regulated
substances (lead, mercury, cadmium, hexavalent chromium, polybrominated
biphenyls, polybrominated diphenyl ethers)
GB/T 26572, Requirements of concentration limits for certain restricted substances
in electrical and electronic products
3 Terms and definitions
No terms and definitions need to be defined in this document.
4 Product representation method
4.1 Models
See Table 1 for the models of tinned round copper wires.
4.2 Specifications
The specification of tinned round copper wire is indicated by the nominal diameter d,
as shown in Table 2.
4.3 Representation method
The tinned round copper wire is represented by model, specification and the number of
this document.
Example 1: TXR 0.500 GB/T 4910-2022 represents: tinned soft round copper wire, of
nominal diameter 0.500 mm, in soft state.
9 Coating
9.1 The surface of the tin coating shall be smooth and continuous, and shall be free from
defects affecting product performance. Check with normal vision.
9.2 The tin coating shall be continuous. As required by the buyer, the test for continuity
of coating of the tinned round copper wire shall be carried out in accordance with GB/T
4909.9-2009 or GB/T 4909.10. When following GB/T 4909.9-2009, the test shall be
carried out according to the test procedure a) in 5.5 of GB/T 4909.9-2009, the
immersion cycle shall be 2 cycles, and the surface of the sample shall not turn black
after the test. When testing according to GB/T 4909.10, the color of the solution shall
not be darker than that of the standard colorimetric solution.
9.3 The tin coating be firmly attached to the surface of the copper wire. The test for
adherence of coating of tinned round copper wire shall be carried out in accordance
with GB/T 4909.11, and the sample shall be wound on a test rod of 4 times its nominal
diameter. After the tinned round copper wire is subjected to the test for adherence of
coating, the outer peripheral surface of the spirally wound part of the sample shall not
turn black, and the coating shall have no cracks.
10 Solderability
TXRH-type tinned round copper wire shall be solderable.
As required by the buyer, the solderability test of the TXRH-type tinned round copper
wire shall be carried out in accordance with GB/T 4909.12 or GB/T 2423.28-2005.
When following GB/T 4909.12, the welding time shall not be greater than 2 s. When
following GB/T 2423.28-2005, the test method 1 in 4.6 of GB/T 2423.28-2005 (slot
welding at a temperature of 235 °C) shall be used for the test. After the test, the surface
of the sample shall be covered with a layer of smooth and bright solder layer, and shall
not have concentrated defects such as pinhole non-wetting or weakly wetting areas.