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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 4423-2007 Copper and copper alloy cold-drawn rod and bar, and the following main technical changes have been made with respect to GB/T 4423-2007.
——The application scope is modified (see Clause 1 herein and Clause 1 of 2007 Edition);
——The state representation method is modified and the code name is added (see Table 1 herein and Table 1 of 2007 edition);
The designation of H59, H70, HSn704, HA161-4-3-1 is added and the designation of QSil.8 is deleted (see Table 1 herein and Table 1 of 2007 edition);
——The specification range of some designations is increased (see Table 1);
——T2 and T3 semi-hard (H02), H65 semi-hard (H02), HPb59-1 hard (H04), HPb63-3 softening annealing (O60) and 1/4 hard (H01) is added (see Table 1);
——The provision of unspecified length of rod and bar is deleted, and the provision of rod and bar length, ranging from 500mm~6 000mm, is added (see Table 1 herein and Table 1 of 2007 edition);
——The tolerance requirements of copper and brass rectangular rod and bars is modified to be the same as that of square and regular hexagonal bars (see Table 4 herein and Table 4 of 2007 edition);
——The tolerance for specified or multiple length of rod and bar is modified from +15mm to +10mm (see 4.2.3 herein and 3.3.3 of 2007 Edition).
——The straightness requirement is modified (see 4.2 herein and 3.3.6 of 2007 edition);
——Some mechanical performance indexes are modified(see 4.3 herein and 3.4 of 2007 edition);
——The Brinell hardness in the mechanical properties table is modified to Vickers hardness, Rockwell hardness and Brinell hardness, and the specified plastic elongation strength requirements are added (see Tables 8 and 9 herein and Tables 7 and 8 in the 2007 edition);
——The oxygen content requirement is deleted (see 3.6 of 2007 edition).
——The measurement method of overall dimensions of rod and bar is modified (see 5.2 herein and 4.2 of 2007 edition);
——Annex A is deleted (see Annex A of 2007 edition).
This standard was proposed by China Nonferrous Metals Industry Association.
This standard is under the jurisdiction of National Technical Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
The previous editions replaced by this standard are as follows:
——GB/T 4423~4426-1984, GB/T 4427-1984, GB/T 4429~4433-1984;
——GB/T 4423-1992, GB/T 13809-1992.
——GB/T 4423-2007.
Copper and copper alloy cold-drawn rod and bar
1 Scope
This standard specifies the classification and labeling, technical requirements, test methods, inspection rules, markings, packaging, transportation, storage, quality certificates, and purchase orders (or contracts) 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 for general use (hereinafter referred to as rod and bar).
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 230.1 Metallic materials — Rockwell hardness test — Part 1: Test method
GB/T 231.1 Metallic materials — Brinell hardness test — Part 1: Test method
GB/T 2828.1 Sampling procedures for inspection by attribute — Part1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection
GB/T 3310 Ultrasonic testing method of copper and copper alloy bars
GB/T 4340.1 Metallic materials — Vickers hardness test — Part 1:Test method
GB/T 5121 (all parts) Methods for chemical analysis of copper and copper alloys
GB/T 5231 Designation and chemical composition of wrought copper and copper alloys
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 8888 Wrought heavy non-ferrous metal products-packing, marking, transportation, storing and certificate of quality
GB/T 10567.1 Wrought copper and copper alloys — Detection of residual stress — Mercury nitrate test
GB/T 10567.2 Wrought copper and copper alloys — Detection of residual stress — Ammonia test
GB/T 26303.3 Measuring methods for dimensions and shapes of wrought copper and copper alloy — Part 2: Rod, wire and profile
GB/T 34505-2017 Copper and copper alloy materials — Tensile testing at room temperature
YS/T 336 Method of fracture test for tube and rod of copper and copper alloys, nickel and nickel alloys
YS/T 482 Methods for analysis of copper and copper alloys — The atomic emission spectrometry
YS/T 483 Methods for analysis of copper and copper alloys — X-Ray fluorescence spectrometric (wavelength dispersive)
YS/T 668 Sampling method of physical and chemical testing for copper and copper alloys
3 Classification and labeling
3.1 Product classification
The designation, code, state and specification of rod and bar shall meet those specified in Table 1. The width-height ratio of rectangular bars shall meet those specified in Table 2.
Table 1 Designation, code, state and specification of rod and bar
Classification Designation Code State Outer diameter (or across flat)/mm Length/mm
Round, square, hexagonal bar Rectangular bar
Copper Oxygen-free copper TU1
TU2 T10150
T10180 Softening annealing (O60)
Hard (H04) 3~80 3~80 500~6 000
Fine copper T2
T3 T11050
T11090 Softening annealing (O60)
Hard (H04)
Semi-hard (H02) 3~80 3~80
Phosphorized copper TP2 C12200 Softening annealing (O60)
Hard (H04) 3~80 3~80
Zirconium copper TZr0.2
TZr0.4 T15200
T15400 Hard (H04) 4~40 —
Cadmium copper TCd1 C16200 Softening annealing (O60)
Hard (H04) 4~60 —
Chromium copper TCr0.5 T18140 Softening annealing (O60)
Hard (H04) 4~40 —
Brass Common Brass H96 T20800 Softening annealing (O60)
Hard (H04) 3~80 3~80
H95 C21000 Softening annealing (O60)
Hard (H04) 3~80 3~80
H90 C22000 Hard (H04) 3~40
H80 C24000 Softening annealing (O60)
Hard (H04) 3~40 —
H70 T26100 Semi-hard (H02) 3~40
H68 T2630 Semi-hard (H02)
Softening annealing (O60) 3~80 —
H65 C27000 Softening annealing (O60)
Hard (H04)
Semi-hard (H02) 3~80 —
H63 T27300 Semi-hard (H02) 3~50 —
H62 T27600 Semi-hard (H02) 3~80 3~80
H59 T28200 Semi-hard (H02) 3~50 —
Lead brass HPb63-3 T34700 Softening annealing (O60)
1/4 hard (H01)
Semi-hard (H02)
Hard (H04) 3~80 3~80
Classification Designation Code State Outer diameter (or across flat)/mm Length/mm
Round, square and hexagonal bar Rectangular bar
Brass Lead brass HPb63-0.1 T34900 Semi-hard (H02) 3~50 — 500~6 000
HPb61-1 C37100 Semi-hard (H02) 3~50 —
HPb59-1 T38100 Semi-hard (H02)
Hard (H04) 2~80 3~80
Tin brass HSn70-1 T45000 Semi-hard (H02) 3~80 —
HSn62-1 T46300 Hard (H04) 4~70 —
Manganese brass HMn58-2 T67400 Hard (H04) 4~60 —
Iron brass HFe59-1-1
HFe58-1-1 T67600
T67610 Hard (H04) 4~60 —
Aluminium brass HAl61-4-3-1 T69230 Hard (H04) 4~40 —
Bronze Tin bronze QSn4-3
QSn4-0.3
QSn6.5-0.1
QSn6.5-0.4 T50800
C51100
T51510
T51520 Hard (H04) 4~40 — 500~6 000
QSn7-0.2 T51530 Hard (H04)
Ultra-hard (H06) 4~40 —
Aluminium bronze QAl9-2
QAl9-4
QAl10-3-1.5 T61700
T61720
T61760 Hard (H04) 4~40 —
Silicon bronze QSi3-1 T64730 Hard (H04) 4~40 —
Cupronickel Iron cupronickel BFe30-1-1 T71510 Softening annealing (O60)
Hard (H04) 16~50 —
Manganese cupronickel BMn40-1.5 T71660 Hard (H04) 7~40 —
Packfong BZn15-20 T74600 Softening annealing (O60)
Hard (H04) 4~40 —
BZn15-24-1.5 T79500 Softening annealing (O60)
Hard (H04)
Ultra-hard (H06) 3~18 —
Note: Rod and bar with other designations and specifications may be supplied after negotiation between both parties, and specific requirements should be noted in the contract.
Table 2 Width-height ratio of rectangular bar section
Short across flat/mm Long/short across flat
≤10 ≤2.0
>10~20 ≤3.0
>20 ≤3.5
3.2 Product labeling
A product shall be labeled in the order of product name, standard number, designation (or code), state, precision level and specification. See Figure 1 for the schematic diagram of section shape of rod and bar, and its labeling example is as follows:
Round bar Square bar Rectangular bar Hexagonal bar
Keys:
Φ——diameter;
a——long across flat;
b——short across flat;
s——across flat.
Figure 1 Schematic diagram of section shape of rod and bar
Example 1: a round copper rod made of TP2 (C12200), which is supplied in hard (HO4), ordinary grade, with diameter of 19mm and length of 3 000mm is labeled as follows:
Round bar GB/T 4423-TP2 H04-19X3 000
or, Round bar GB/T 4423-T12200 H04-19X3 000
Example 2: a square copper rod made of H68(T26300), which is supplied in softening annealing (O60), high precision grade, with across flat of 10mm from each other and length of 3 000mm is labeled as follows:
Square bar GB/T 4423-H68 O60 high -10X3 000
or, Square bar GB/T 4423-T26300O60 high -10X3 000
Example 3: a rectangular copper rod made of HPb63-3(T34700), which is supplied in 1/4 hard (H01), ordinary grade, with long distance of 20mm and short distance of 13mm and length of 1 000mm is labeled as follows:
Rectangular bar GB/T 4423-HPb63-3 H01-20X13X1 000
or, Rectangular bar GB/T 4423-T34700H01-20X13X1 000
Example 4: a hexagonal copper rod made of HPb61-1(T37100), which is supplied in semi-hard state (H02), high precision grade, with opposite distance of 30mm and length of 2 000mm, is labeled as follows:
Hexagonal bar GB/T 4423-HPb61-1 H02 Height 30X2 000
or, Hexagonal bar GB/t4423-t37100h02 Height-30X2 000
4 Technical requirements
4.1 Chemical composition
Chemical composition of rod and bar of H96 designation shall meet those specified in Table 3, while that of other designations shall meet those specified of GB/T 5231.
Table 3 Chemical composition of H96 designation
Designation Chemical composition (mass fraction)/%
Cu Fe Pb Zn
H96 a 95.0~97.0 ≤0.10 ≤0.03 Allowance
a The sum of Cu and the listed elements is not less than 99.8%.
4.2 Dimension and tolerance
4.2.1 Diameter (or across flat) and its tolerance
The diameter (or across flat) and tolerance of copper and brass rod and bar shall meet those specified in Table 4, and the diameter (or across flat) and tolerance of bronze and white copper rod and bar shall meet those specified in Table 5.
Foreword i
1 Scope
2 Normative references
3 Classification and labeling
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation, storage and quality certificate
8 Order form (or contract) contents
