This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of white copper wire. This standard is applicable to the manufacture of elastic parts and resistor materials as well as white copper round wire used in general industrial sectors. GB/T 3125-1994 White copper wire GB/T3125-1994 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Copper-nickel alloy wires
Subject content and scope of application
GB/T 3125 --94
Replaces GB3125--82
This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of white copper wires. This standard is applicable to the manufacture of elastic elements and resistor materials as well as white copper round wires used in general industrial sectors. Reference standards
GB228 Metal tensile test method
GB/T2974 Industrial thermocouple wire inspection method GB/T3248 Copper-nickel and its alloy resistivity determination method GB5234 Processed white steel chemical composition and product shape GB6397 Metal tensile test specimen
GB/T8550 White copper chemical analysis method
GB8888 Packaging, marking, transportation and storage of heavy non-ferrous metal processing products GB/T10573 Non-ferrous metal wire tensile test method YB799 Resistance temperature coefficient determination method
3 Product classification
3.1 Brand, state, specification
The brand, state and specification of the product shall comply with the provisions of Table 1. Table 1
BMn40-1.5
BMn3-12
BFe 30-1-1
BZn15-20
3.2 Marking example
Soft (M), Hard (Y)
Soft (M), Semi-hard (Y.), Hard (Y) Diameter, mm
0.05~-6.0
Wire made of BMn40-1.5 alloy, in hard state, with higher precision and a diameter of 1.5mm, is marked as: wire BMn40-1.5Y Higher 1.5 GB/T312594 Made of BMn3-12 alloy, soft state, ordinary precision, 0.5 mm diameter wire, marked as: wire BMn3-12M High 0.5 GB/T3125-94
Approved by the State Administration of Technical Supervision on February 20, 1994, implemented on December 1, 1994
4 Technical requirements
4.1 Chemical composition
GB/T 3125-94
The chemical composition of the wire shall comply with the provisions of GB5234. 4.2 Dimensions and allowable deviations
4.2.1 The wire diameter and allowable deviation shall comply with the provisions of Table 2. Table 2
Allowable Deviation
Higher Grade
Ordinary Grade
0.05~0. 1
>0. 1~~0. 3
≥0. 3--0. 6
Wires with other specifications and allowable deviations can be supplied upon agreement between the supplier and the buyer. 0.6~~1. 0
4.2.3 The deviation grade of the wire must be indicated in the order contract, otherwise it shall be supplied according to the ordinary grade in Table 2. 4.2.4 When the buyer requires unidirectional deviation, its value shall be twice the value in Table 2. 4.2.5 Out-of-roundness
When the wire diameter is less than or equal to 3.0mm, its out-of-roundness shall not exceed half of the allowable deviation of the diameter. When the wire diameter is greater than 3.0mm, its out-of-roundness shall not exceed the allowable deviation of the diameter. 4.3 Mechanical properties
The room temperature tensile test results of the wire shall comply with the requirements of Table 3. Table 3 | |tt | 0
0. 1～1. 0
>1. 0~6. 0
0.10~-0.20
>0. 20~0. 50
7>0. 50~2. 0
>2.0~6. 0
0.10~0.50
>0.50~6. 0
0.10~0.50
>0.50~6. 0
≥390
≥140
≥345
Tensile strength ab,N/mm2
490~735bzxZ.net
4 40685
440~635
685~980
685~880
635~835
735-~9 80
735~~930
635~880
540~785
685~980
590~880
590-880
490~785
4.4.1 The electrical performance test results of BMn3-12 and BMn40-1.5 shall comply with the requirements of Table 4. 670
1. 0~3. 0
3. 0 ~-6. 0
Elongation 6,%
(l, - 100 mm)
Test items
Resistivity
Ω- mm'/m
Resistance temperature
108/℃
10 \/℃2
And copper thermoelectric potential E,μV/
GB/T 3125-94
BMn312
0.42~0.52
0.43~0.53
-5~+10
-12～+20
B3Mn40-1.5
0.45~0. 48
0. 46~0.52
20+100
0~100C
0~100℃
4.4.2The grade of the secondary resistance temperature coefficient (α) of BMn3-12 wire must be specified in the order contract, otherwise it will be supplied as Grade I. 4.4.3 The primary resistance temperature coefficient (β) and * of BMn3-12 wire and the thermal electromotive force (E) of copper are only subject to the special requirements of the user and shall be specified in the order contract.
4.5 Fracture
The fracture of the wire should be dense, without shrinkage, pores, delamination and inclusions. 4.6 Surface quality wall
4.6.1 The surface of the wire should be smooth and clean, without cracks, peeling, thorns, rough drawing 4.6.2 The surface of the wire is allowed to have slight, localized indentations, pits, scratches and spots that do not cause the wire diameter to exceed its allowable deviation. Slight darkening and oxidation color and slight, localized water and oil marks are not used as a basis for scrapping. 4.7 Wire reel (spool) weight
4.7.1 The weight of the wire reel (spool) shall comply with the provisions of Table 5. Table 5
Wire diameter
0. 05~~0. 1
0. 1~0. 5
>0. 5 ~~1. 0
3. 0~6. 0
Standard roll
4.7.2 Each batch of permitted delivery weight is not more than 10% of the lighter wire roll (spool). 5 Test methods
5.1 Chemical composition arbitration analysis method
The chemical composition arbitration analysis method of wire shall be carried out in accordance with GB/T8550. 5.2 Mechanical property test method
The weight of each roll (spool), kg
not less than
The room temperature tensile test method of lighter roll
Wire shall be carried out in accordance with GB228 and GB/T10573. 5.3 Electrical property test method
5.3.1 The resistivity determination method of wire shall be carried out in accordance with GB/T3248. 671
GB/T 3125-94
5.3.2 The resistance temperature coefficient of the wire is determined in accordance with YB799. 5.3.3 The thermoelectric potential of the wire is determined in accordance with GB/T2974. 5.4 Dimension measurement method
The diameter of the wire is measured with a measuring tool of corresponding accuracy. 5.5 Surface quality inspection
The surface quality of the wire is visually inspected. 6 Inspection rules
6.1 Inspection and acceptance
6.1.1 The wire is inspected by the supplier's technical supervision department to ensure that the product quality meets the requirements of this standard and fill in the quality certificate. 6.1.2 The buyer shall inspect the received products in accordance with the provisions of this standard. If the inspection results do not meet the requirements of this standard, the buyer shall submit the matter to the supplier within 3 months from the date of receipt of the product, and the supplier and buyer shall negotiate to resolve the issue. 6.2 Batching
Wires shall be submitted for acceptance in batches. Each batch shall consist of the same brand, state and specification, and the weight of each batch shall not exceed 500kg. 6.3 Inspection Items
6.3.1 Each batch of wires shall be inspected for chemical composition, dimensions, mechanical properties and surface quality. 6.3.2 The electrical properties of wires shall be inspected in accordance with the provisions of Article 4.4. 6.3.3 The supplier may not conduct the fracture inspection of wires, but it must be guaranteed. 6.4 Sampling Location and Sampling Quantity
6.4.1 For chemical composition sampling, the supplier shall take 1 sample from each furnace during the melting and casting process; the buyer shall take 1 sample from each batch of wires. 6.4.2 For tensile testing, 2 rolls (axles) shall be randomly selected from each batch, and 1 sample shall be taken from each roll (axle). The samples shall comply with the provisions of GB6397 and the sample number shall be R 17.
6.4.3 For electrical properties sampling, 2 rolls (axles) shall be randomly selected from each batch, and 1 sample shall be taken from each roll (axle). 6.4.4 For each batch of wires, the dimensions shall be measured and the surface quality shall be inspected roll by roll (axle). 6.5 Repeated test
Even if only one sample fails the test, double the number of samples should be taken from the batch to retest the unqualified item. If one sample still fails the retest, the whole batch shall be scrapped or tested roll by roll (axis). The qualified ones shall be accepted in a separate batch. 7 Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of wires shall be carried out in accordance with GB8888. Additional remarks:
This standard was proposed by China Nonferrous Metals Industry Corporation. This standard was drafted by Shenyang Nonferrous Metals Processing Plant. The main drafters of this standard are Guan Chengzhi, Zou Pengling, Zhang Chunxuan and Guo Shuxue. 672
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