This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of bronze wire. This standard applies to cadmium bronze, silicon bronze and tin bronze round wire used in various industrial sectors. GB/T 14955-1994 Bronze Wire GB/T14955-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Subject Content and Scope of Application
Bronze wires
GB/T 14955--.94
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of bronze wires. This standard is applicable to cadmium bronze, silicon bronze and tin bronze round wires used in various industrial sectors. 2 Reference standards
GB 228
Metal tensile test method
Metal wire repeated bending test method
GB2976 Metal wire winding test method
GB/T3248 Determination of resistivity of copper, nickel and their alloys GB5233 Chemical composition and product shape of processed bronze GB 6397
Metal tensile test specimen
GB/T6520 Chemical analysis method for silicon bronze and silicon brass GB/T 8002
Chemical analysis method for tin bronze
GB8888 Packaging, marking, transportation and storage of heavy non-ferrous metal processed products GB/T10573 Tensile test method for non-ferrous metal filaments YB598 Chemical analysis method for cadmium bronze
3 Product classification
3.1 Brand, state and specification
The brand, state and specification of the product shall comply with the provisions of Table 1. Table 1
QSi3-1,QSn4-3
QCd1.QSn6. 5-0. 1,QSn6. 5-0. 4QSn7-0.2
3.2 Marking example
Hard (Y)
Soft (M), Hard (Y)
Wire made of Qcd1 alloy, in soft state, with higher precision and a diameter of 0.6mm, is marked as: GB 312282,
Note: 1) Replaces GB3123-82,
GB 3124--82
Approved by the State Administration of Technical Supervision on February 20, 1994. Diameter. mm
Implemented on December 1, 1994
GB/T1495594
Wire QCd1M High 0.6GB/T14955--94 Made of QSn6.5-0.1 alloy, hard state, ordinary precision, 3.0mm diameter wire, marked as: Wire QSn6.5-0.1Y3.0GB/T14955-944 Technical requirements
4.1 Chemical composition
The chemical composition of the wire shall comply with the provisions of GB5233. 4.2 Size and allowable deviation
4.2.1 The wire diameter and allowable deviation shall comply with the provisions of Table 2. Table 2
Higher grade
Allowable deviation (±)
Ordinary grade
>0. 3~~0. 6
>0. 6~1. 0
4.2.2 Wires with other specifications and allowable deviations can be supplied through negotiation between the supplier and the buyer. The wire deviation grade must be indicated in the order contract, otherwise it will be supplied according to the ordinary grade in Table 2. 4.2.3
When the buyer requires unidirectional deviation, its value shall be twice the value in Table 2. 4.2.4
4.2.5 Wire out-of-roundness
>1. 0~3. 0
When the wire diameter is less than or equal to 3.0mm, its out-of-roundness shall not exceed half of the allowable diameter deviation; when the wire diameter is greater than 3.0mm, its out-of-roundness shall not exceed the allowable diameter deviation. 4.3 Mechanical properties
The room temperature tensile test results of the wire shall comply with the requirements of Table 3. Table 3
QSn6.5-0.1
QSn6. 5-0. 4
QSi3-1.QSn4-3.QSn6.5-0.1
QSn6.5-0.4.QSn7-0.2
Diameter, mm
0. 1~~0.5
>0. 5~~4. 0
>4. 0～6. 0
0. 1~1. 0
≥1. 0~6. 0
0.1~1.0
>1. 0~2. 0
>2. 0~4. 0
>4. 0~6. 0
Tensile strength, N/mm
≥275
590-880
490-~735
470~685
≥350
880~1130
860~~1 060
8301030
780~980
23. 0~~6. 0
Elongation,
(la- 100 mm)
4.4 Process performance
4.4.1 Repeated bending testwwW.bzxz.Net
GB/T 14955-94
Silicon bronze wire and hard tin bronze wire with diameter of 1.0～6.0mm shall be subjected to repeated bending test, and the number of bending times shall not be less than 3 times. 4.4.2 Winding test
Tin bronze wire and silicon bronze wire used as spring shall be subjected to winding test, and shall be wound on a cylinder with twice the diameter of the wire for 10 times without cracking. 4.5 Electrical properties
4.5.1 The resistivity of cadmium bronze wire at 20±10℃ shall comply with the provisions of Table 4. Table 4
4.5.2 The resistivity test shall be carried out only according to the user's requirements and when it is specified in the order contract. 4.6 Residual stress
Hard tin bronze wire and silicon bronze wire shall be treated to eliminate residual stress. 4.7 Wire fracture
The wire fracture shall be dense, without shrinkage tail, pores, delamination and inclusions. 4.8 Surface quality
Resistivity p,Q·n/n
4.8.1 The wire surface should be smooth and clean, without cracks, peeling, thorns, rough drawing, folding and inclusions. 4.8.2 The wire surface is allowed to have slight, local indentations and scratches that do not make the wire diameter exceed its allowable deviation. Slight redness, darkening or oxidation color on the wire surface shall not be used as a basis for scrapping. 4.9 Wire reel (spool) weight
4.9.1 The wire reel (spool) weight shall comply with the provisions of Table 5. Table 5
Weight of each roll (spool), kg not less than
Wire diameter, mm
0. 1 ~~ 0. 5
20. 5 ~～~ 1. 0
>1. 0~~3. 0
>3. 0~6. 0
4.9.2 The permitted delivery weight of each batch 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/T6520, GB/T8002 and YB598 respectively. 5.2 Mechanical property test method
The room temperature tensile test method of wire shall be carried out in accordance with GB228 and GB/T10573. 5.3 Process performance test method
5.3.1 The repeated bending test method of wire shall be carried out in accordance with GB238, and the winding
GB/T 14955 ---94
5.3.2 The winding test method of wire shall be carried out in accordance with GB2976. 5.4 Electrical performance test method
The test method of wire resistivity shall be carried out in accordance with GB/T3248. 5.5 Dimension measurement method
The outer dimensions of the wire shall be measured with measuring tools of corresponding accuracy. 5.6 Surface quality inspection
The surface quality of the wire shall be visually inspected. 6 Inspection rules
6.1 Inspection and acceptance
6.1.1 The wire shall be inspected by the technical supervision department of the supplier to ensure that the product quality meets the requirements of this standard and fill in the quality certificate. 6.1.2 The purchaser shall inspect the received products in accordance with the provisions of this standard. If the inspection results do not conform to the provisions of this standard, the purchaser shall submit the matter to the supplier within 3 months from the date of receipt of the product, and the two parties shall negotiate to resolve the issue. 6.2 Batches
Wires shall be submitted for inspection in batches, and each batch shall consist of the same brand, state and specification. 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 Silicon bronze and tin bronze wires shall be subjected to repeated bending and winding tests in accordance with the provisions of 4.5.1 and 4.5.2. For wires with a diameter less than 1.0mm, the supplier may not conduct winding tests, but must ensure that the wires are of the same quality. 6.3.3 When the user requires it, cadmium bronze wires shall be subjected to resistivity tests in accordance with the provisions of 4.6. 6.3.4 The supplier may not conduct fracture tests on wires, but must ensure that the wires are of the same quality. 6.4 Sampling location and number of samples
6.4.1 Chemical composition sampling: the supplier shall take one sample from each furnace during the melting and casting process, and the buyer shall take one sample from each batch of wire rods. 6.4.2 Tensile test samples shall be taken from 2 rolls (axes) at random from each batch, and one sample shall be taken from each roll (axle). The sample shall comply with the provisions of GB6397, and the sample number is R17.
6.4.3 For repeated bending test, winding test and resistivity determination, 2 rolls (axes) shall be taken from each batch, and one sample shall be taken from each roll (axle). 6.4.4 Each batch of wire rods shall be measured for external dimensions and inspected for surface quality roll by roll (axle). 6.5 Repeated test
Even if only one sample fails the test result of each test, double the number of samples shall be taken from the batch for retesting the unqualified item. If one sample still fails the retest result, the entire batch shall be scrapped or reel by reel (axle) shall be inspected, and the qualified ones shall be individually batched for acceptance. 7 Marking, packaging, transportation, storage
The marking, packaging, transportation and storage of wire rods shall be carried out in accordance with the provisions of 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. 696
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