GB/T 4423-2020 PDF English
US$245.00 · In stock · Download in 9 secondsGB/T 4423-2020: Copper and copper alloy cold-drawn rod and bar Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 4423: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 4423-2020 | English | 245 |
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Copper and copper alloy cold-drawn rod and bar
| Valid |
| GB/T 4423-2007 | English | 75 |
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Copper and copper-alloy cold-drawn rod and bar
| Obsolete |
| GB/T 4423-1992 | English | 399 |
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3 days
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Copper bars
| Obsolete |
| GB 4423-1984 | English | RFQ |
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3 days
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(Copper rods)
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 4423-2020
GB/T 4423-2020: Copper and copper alloy cold-drawn rod and bar---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4423-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.30
H 62
Replacing GB/T 4423-2007
Copper and copper alloy cold-drawn rod and bar
Issued on. SEPTEMBER 29, 2020
Implemented on. AUGUST 01, 2021
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 Classification and marking... 6
4 Technical requirements... 11
5 Test methods... 18
6 Inspection rules... 20
7 Marks, packaging, transportation, storage and quality certificate... 22
8 Order sheet (or contract) content... 22
1 Scope
This Standard specifies classification and marking, technical requirements, test
methods, inspection rules, marks, packaging, transportation, storage and
quality certificate, purchase order (or contract) content for copper and copper
alloy cold-drawn rod and bar.
This Standard is applicable to general purpose round, rectangular, square and
regular hexagonal copper and copper alloy cold-drawn rod and bar (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 Rockwell hardness test - Part 1.Test method (scales A,
B, C, D, E, F, G, H, K, N, T)
GB/T 231.1, Metallic materials - Brinell hardness test - Part 1.Test method
GB/T 2828.1, Sampling procedures for inspection by attributea – Part 1.
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
3 Classification and marking
3.1 Product classification
Designations, codes, states and specifications of rod and bar shall comply with
Table 1.The aspect ratio of the rectangular rod and bar shall meet the
requirements of Table 2.
3.2 Product marking
Product marking is indicated in the order of product name, standard number,
designation (or code), state, accuracy level and specification.
4 Technical requirements
4.1 Chemical composition
The chemical composition of H96 rod and bar shall meet the requirements of
Table 3.The chemical composition of other designations shall meet the
requirements of GB/T 5231.
4.2 Dimensions and allowable deviation
4.2.1 Diameter (or opposite margin) and allowable deviation
The diameters (or opposition margins) of copper and brass rod and bar as well
as allowable deviation shall meet the requirements of Table 4.
4.2.2 Roundness
The roundness of round rod and bar shall not exceed half of the allowable deviation of the diameter.
4.2.4 Twist
The twist of square, rectangular and regular hexagonal rod and bars shall not
Diameter (oropposite margin)
4.2.5 Fillet radius
Filets are allowed at the edges and corners of the cross section of polygonal
rod and bar. The fillet radius shall meet the requirements of Table 6.
4.3 Mechanical properties
The mechanical properties of rod and bar at room temperature shall meet the
requirements of Table 8 and Table 9.
4.4 Internal quality
Except TU1, TU2, T2, T3, TP2, TCr0.5, H96, H95, other alloy rods and bars
shall be inspected for fracture or ultrasonic flaw detection.
4.5 Residual stress
Brass (except H96, H95), tin bronze, silicon bronze and zinc-nickel alloy rods
and bars in H01, H02, H04, H06 states can be subjected to residual stress
inspection. There shall be no visible cracks in the inspection results.
4.6 Surface quality
The surface of rod and bar shall be bright and clean. There shall be no defects
that affect use.
5 Test methods
5.1 Chemical composition
The analysis method for chemical composition of rod and bar shall be carried
out according to the regulations of GB/T 5121, YS/T 482 or YS/T 483.
5.2 Dimensions and allowable deviation
The measurement method for dimensions of rod and bar shall be carried out
according to the regulations of GB/T 26303.2.
5.3 Mechanical properties
5.3.1 The tensile test at room temperature of rod and bar as well as sample
preparation method are carried out according to the regulations of GB/T34505-
2017.Sample selection shall meet the requirements of Table 10.
5.4 Internal quality
5.4.1 The fracture inspection of rod and bar shall be carried out in accordance
with the provisions of YS/T 336.
5.4.2 The ultrasonic flaw detection of rod and bar shall be carried out according to GB/T 3310.
5.5 Residual stress
The residual stress inspection of rod and bar shall be carried out according to
the provisions of GB/T 10567.1 and GB/T 10567.2.
5.6 Surface quality
Visually inspect the surface quality of rod and bar.
6 Inspection rules
6.1 Inspection and acceptance
6.1.1 Rod and bar shall be inspected by the supplier’s technical supervision
department to ensure that the product quality meets the requirements of this
Standard. 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 result does not conform to the
provisions of this Standard (or order contract), it shall be submitted to the
supplier within 1 month from the date of receipt of the product. It shall be solved
by negotiation between the supplier and the purchaser. If arbitration is required,
arbitration sampling shall be conducted jointly by both parties.
6.2 Batching
Rod and bar shall be submitted for acceptance in batches. Each batch shall be
composed of rods and bars of the same designation, specification and state.
The weight of each batch does not exceed 5000kg.
6.3 Inspection items
6.3.1 Each batch of rods and bars shall be inspected for chemical composition,
dimensions and allowable deviation, internal quality and surface quality.
6.3.2 Each batch of rods and bars shall be inspected for mechanical properties
(tensile test or hardness test). Choose either tensile test or hardness test. When
not specified in the contract, perform tensile test. When the tensile test is
selected, if the purchaser also requires hardness test and it is specified in the
contract, hardness test shall also be carried out. The hardness test results are
for reference only. When choosing hardness test, when the purchaser also
requires tensile test and it is specified in the contract, tensile test shall also be
carried out. The tensile test results are for reference only.
6.3.3 When requested by the purchaser, residual stress inspection shall also
be carried out.
6.4 Sampling
Product sampling shall meet the requirements of Table 11.Sampling method is
carried out in accordance with YS/T 668.
6.5 Determination of inspection result
6.5.1 The value of inspection result shall be rounded according to the provisions
of GB/T 8170.Use rounding value comparison method to determine.
6.5.2 When the chemical composition fails, the batch of rods and bars is rejected.
6.5.3 When the dimensions of rod and bar, its allowable deviation and surface
quality fail, it is rejected by piece. When the number of rejected pieces in each
batch exceeds the acceptable quality limit, the entire batch is rejected or
inspected by supplier piece by piece. Only accepted products are delivered.
6.5.4 When there are rejected samples in the test results of mechanical
properties, fracture and residual stress, double the number of samples shall be
taken from the batch of products (including the one that failed the original
inspection) for the reinspection of rejected items. If all retest results are
conforming, the batch of products shall be accepted.
6.5.5 When the ultrasonic flaw detection is nonconforming, it shall be rejected
by piece.
6.5.6 When there are other defects, it shall be negotiated and determined by
both parties.
7 Marks, packaging, transportation, storage and quality certificate
Product’s marks, packaging, transportation, storage and quality certificate shall
comply with GB/T 8888.
8 Order sheet (or contract) content
The order sheet (or contract) for rod and bar listed in this Standard shall include
the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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