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GB/T 4423-2007 English PDF (GBT4423-2007)

GB/T 4423-2007 English PDF (GBT4423-2007)

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GB/T 4423-2007: Copper and copper-alloy cold-drawn rod and bar

This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage and contract contents of copper and copper-alloy cold-drawn rod and bar.
GB/T 4423-2007
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 77.150.30
H 62
Replacing GB/T 4423-1992, GB/T 13809-1992
Copper and copper-alloy cold-drawn rod and bar
ISSUED ON. APRIL 30, 2007
IMPLEMENTED ON. NOVEMBER 01, 2007
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Requirements ... 6
4 Test methods ... 15
5 Inspection rules ... 16
6 Marking, packaging, transport, storage and quality certificates ... 18 7 Order form (or contract) content ... 18
Appendix A (Normative) Measurement method of twisting degree ... 20
Foreword
This standard refers to ASTM B 249-04 ?€?General requirements for wrought copper and copper alloy rod, bar, shapes and forgings?€?.
This standard replaces GB/T 4423-1992 ?€?Copper and copper-alloy cold-drawn rod and bar?€? and GB/T 13809-1992 ?€?Wrought copper and copper alloy
rectangular bars?€?, AND incorporates YS/T 76-1994 ?€?Lead brass drawn rods with tooth pattern?€?.
As compared with GB/T 4423-1992, GB/T 13809-1992, and YS/T 76-1994, this standard has the following changes.
- Newly ADD the hard state of the four designations H90, QZr0.2, QZr0.4, QSi1.8 AND the semi-hard state of HPb61-1.
- CHANGE the minimum diameter of the bar from 5 mm to 3 mm.
- DELETE the long sample elongation after fracture A11.3 from the mechanical properties; RETAIN the short sample elongation after fracture A.
- MODIFY the dimensions and allowable deviations of the bar in accordance with ASTM B 249, CLASSIFY the deviations of the diameter of copper and
copper alloy bars (opposite side distance) based on materials and
accuracies. Materials are divided into red copper, brass, bronze and
cupronickel, AND accuracy is divided into high accuracy and ordinary
accuracy. The accuracy is slightly increased as compared with that of the original standard.
Appendix A of this standard is a normative appendix.
This standard was proposed by the China Nonferrous Metals Industry
Association.
This Standard shall be under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee.
This standard was drafted by Shenyang Nonferrous Metal Processing Factory. The main drafters of this standard. Bai Changhou, Liu Gang, Wang Li, Liu Guanqiang, Dong Yanxia, Zhang Yunli.
As for this standard, the National Nonferrous Metals Standardization Technical Committee is responsible for the interpretation.
This Standard replaces the standard previously issued as follows.
Copper and copper-alloy cold-drawn rod and bar
1 Scope
This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage and contract contents of copper and copper-alloy cold-drawn rod and bar.
This standard applies to round, rectangular, square and hexagonal copper and copper-alloy cold-drawn rod and bar.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 228 Metallic materials - Tensile testing at ambient temperature
GB/T 231.1 Metallic materials - Brinell hardness test method
GB/T 351 Metallic materials - Resistivity measurement method
GB/T 3310 Ultrasonic testing method of copper and copper alloy bars
GB/T 5121 (All parts) Methods for chemical analysis of copper and copper alloys
GB/T 5231 Wrought copper and copper alloys chemical composition limits
and forms of wrought products
GB/T 8888 Wrought heavy non-ferrous metal products - Packing, marking,
transporting and storing
GB/T 10567 (All parts) Wrought copper and copper alloys - Detection of
residual stress
YS/T 335 Metallographic determination methods of oxygen content in
oxygen-free copper for electrical vacuum devices
3.6 Oxygen content
The oxygen content of oxygen-free copper bar shall comply with the provisions of YS/T 335; AND it can be deemed as qualified if reaching to the level 1, 2 and 3 of standard pictures.
3.7 Internal quality
Bar fracture shall be dense and free from discontinuity. It is not allowed for such defects as pinhole, delamination or inclusions which exceed the specifications of YS/T 336.
The bars of T2, T3, TP2, TU1, TU2, H96 and QCr0.5 are free from fracture test. The QCd1 bar is subjected to macroscopic inspection. Other alloy bars must be subjected to fracture or ultrasonic detection.
3.8 Internal stress
In addition to H96, the brass, tin bronze, silicon bronze, and zinc-copper-nickel bars of semi-hard, hard and ultra-hard state shall be subjected to stress elimination treatment.
3.9 Surface quality
3.9.1 The surface of the bar shall be smooth and clean. It is not allowed for cracks, peeling, pinhole, inclusion, or sensible ring-shape defects.
3.9.2 It is allowed for the bar surface to have local defects such as scratches, pits, spots or indentations which do not allow the bar diameter to exceed the allowable deviation. Slight straightening marks, fine lines, oxidation color, dark and water marks, and oil traces will not serve as a discarding basis.
4 Test methods
4.1 Arbitration analysis method of chemical composition
The arbitration analysis method of the chemical composition of bars shall follow the provisions of GB/T 5121.
4.2 Dimension measurement method
The dimensions of the product shall be measured by the measurement tools of appropriate accuracy.
4.3 Test method of mechanical properties at ambient temperature
5.1.1 The bar shall be inspected by the technical supervision department of the supplier to ensure that the product quality conforms to the provisions of this standard; AND the quality certificate shall be filled.
5.1.2 The purchaser shall inspect the products received in accordance with the provisions of this standard. If the test result does not conform to the provisions of this standard and the contract, it shall be presented to the supplier in written form AND shall be settled through consultation between the supplier and the purchaser. Objection to the surface quality and dimensional deviation shall be made within one month from the date of receipt of the product. The objection to other performance shall be made within three months from the date of receipt of the product. In the case of arbitration, the sampling for the arbitration shall be conducted jointly by both the supplier and the purchaser.
5.2 Batching
Bars shall be submitted in batches, AND each batch shall be composed of the bars of the same designation, state and specification. The mass of each batch shall be not more than 5000 kg.
5.3 Inspection items
5.3.1 Each batch of products shall be subjected to chemical composition, dimensional deviation, internal mass, electrical conductivity and surface quality inspections.
5.3.2 As for the bars in Table 7 having mechanical properties requirements, each batch shall be subjected to mechanical properties test.
5.3.3 As for the oxygen-free copper bars, it shall be subjected to oxygen content test in each batch.
5.3.4 As for the zirconium bronze bars requiring the electrical conductivity value as specified in 3.5 AND the bars requiring internal stress elimination as specified in 3.8, the supplier may not test it, BUT must guarantee it; if it is required, it shall be tested respectively in accordance with the requirements of 4.4 and 4.7.
5.4 Sampling
Sampling of the product shall be in accordance with Table 9.
Table 9 Product sampling requirements
Inspection items Sampling requirements Reference clause number
Test method
clause number
Chemical composition The supplier shall take one sample from each heat (the 3.2 4.1 d) Dimension specifications;
e) Mass or number of pieces;
f) Dimensional accuracy;
g) Internal stress testing;
h) This standard number;
i) Others.

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