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GB/T 4437.1-2023 PDF in English


GB/T 4437.1-2023 (GB/T4437.1-2023, GBT 4437.1-2023, GBT4437.1-2023)
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GB/T 4437.1-2023: PDF in English (GBT 4437.1-2023)

GB/T 4437.1-2023
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Replacing GB/T 4437.1-2015
Aluminium and aluminium alloys extruded tubes - Part 1:
Seamless tubes
ISSUED ON: NOVEMBER 27, 2023
IMPLEMENTED ON: JUNE 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 Classification ... 7
5 Technical requirements ... 8
6 Test methods ... 14
7 Inspection rules ... 15
8 Marking, packaging, transportation, storage, and quality certificate ... 19
9 Contents of an order form (or contract) ... 20
References ... 21
Aluminium and aluminium alloys extruded tubes - Part 1:
Seamless tubes
1 Scope
This document stipulates the classification, technical requirements, test methods,
inspection rules, marking, packaging, transportation, storage, and quality certificate and
order form (or contract) content of aluminium and aluminium alloy hot-extruded
seamless tubes.
This document applies to the production and inspection of aluminium and aluminium
alloy hot-extruded seamless tubes (hereinafter referred to as "tubes") for general
industrial use.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. For the dated referenced documents,
only the versions with the indicated dates are applicable to this document; for the
undated referenced documents, only the latest version (including all the amendments)
is applicable to this document.
GB/T 3190 Chemical composition of wrought aluminium and aluminium alloys
GB/T 3199 Wrought aluminium and aluminium alloy products - Packing, marking,
transporting and storing
GB/T3246.1 Inspection method for structure of wrought aluminium and aluminium
alloy products - Part 1: Inspection method for microstructure
GB/T 3246.2 Inspection method for structure of wrought aluminum and aluminum
alloy products - Part 2: Inspection method for macrostructure
GB/T 4436 Wrought aluminum and aluminum alloy tubes - Dimensions and
deviations
GB/T 6519 Ultrasonic inspection of wrought aluminium and magnesium alloy
products
GB/T 7998 Method for evaluating the susceptibility to intergranular corrosion of
aluminum alloys
GB/T 7999 Optical emission spectrometric analysis method of aluminum and
aluminum alloys
GB/T 8005.1 Aluminium and aluminium alloy terms and definitions - Part 1:
Product and method of processing and treatment
GB/T 12966 The methods for determining aluminium and aluminium alloys
conductivity using eddy current
GB/T 16865 Test pieces and methods for tensile test for wrought aluminium,
magnesium and their alloy products
GB/T 17432 Methods of sampling for analyzing the chemical composition of
wrought aluminum and aluminum alloys
GB/T 20975(all parts) Methods for chemical analysis of aluminium and aluminium
alloys
GB/T 22640 Test method for determining susceptibility to stress corrosion cracking
of aluminum alloys
GB/T 26492.5 Defects of wrought aluminium and aluminium alloys ingots and
products - Part 5: Defects for tubes, rods or bars, profiles, wires
GB/T 42916 Identification marking of aluminium and aluminium alloy products
3 Terms and definitions
The terms and definitions defined in GB/T 8005.1 and GB/T 26492.5 apply to this
document.
4 Classification
4.1 Grade, supply state, and dimensions
The grade, supply state, and dimensions of tubes shall comply with the requirements in
Table 1. If the buyer has other requirements for the grade, supply state and dimensions,
they shall be determined through negotiation between the supplier and the buyer, and
shall be noted in the order form (or contract).
7.6.3.1 If the tensile mechanical properties at room temperature, conductivity,
resistance to stress corrosion, or susceptibility to intergranular corrosion of any
specimen is unqualified, the batch (or heat of heat treatment) of products will be judged
to be unqualified or shall be implemented in accordance with 7.6.3.2.
7.6.3.2 If the heat of heat treatment of the product can be distinguished, double number
of specimens shall be taken from the heat of heat treatment represented by the specimen
for repeated testing; if the heat of heat treatment cannot be distinguished, double
number of specimens shall be taken from the batch of products for repeated testing
(including products represented by unqualified specimens from the first sampling). If
the repeated test results are all qualified, the product of this batch (or heat of heat
treatment) will be judged to be qualified; if there are still specimen properties that are
unqualified in the repeated test results, the product of this batch (or heat of heat
treatment) will be judged to be unqualified. After the agreement between the supplier
and the buyer, the supplier is allowed to inspect the finished products one by one, and
the qualified ones will be delivered or implemented in accordance with 7.6.3.3.
7.6.3.3 After the supplier repeats the heat treatment, all inspection items in Table 10
except chemical composition, dimensional deviation, and appearance quality shall be
inspected according to the heat. The sampling quantity shall be in accordance with
Table 10. When all inspection results are qualified, the batch of products is deemed to
be qualified; otherwise, the batch of products is deemed to be unqualified.
7.6.4 Ultrasonic flaw detection level
If the ultrasonic flaw detection level of any tube fails, the tube will be deemed
unqualified.
7.6.5 Macrostructure
If the macrostructure of any specimen fails, it shall be handled as follows.
a) When the tubes are unqualified due to metallurgical defects such as cracks,
blowholes, bright grains, non-metallic inclusions, compound segregation or
intermetallic compounds, the batch of tubes will be judged to be unqualified.
However, after negotiation between the supply and demand parties, the
supplier can inspect one by one and deliver the qualified ones.
b) When a tube is unqualified due to back end condition, peripheral coarse grain,
or lamination, it is allowed to cut off a section from the extruded tail end of
the tube and then re-inspect until it is delivered qualified. Other tubes in the
batch shall be cut tail according to the maximum length of the distribution of
the above-mentioned defects on the inspected tube, or inspected one by one,
and those that pass the test will be delivered.
7.6.6 Microstructure
When the microstructure of any specimen fails, if the tube's heat of heat treatment can
be distinguished, the heat of heat treatment represented by the specimen will be judged
to be unqualified; other heats will be inspected in sequence, and the qualified one will
be delivered. If the heat of heat treatment cannot be distinguished, the batch of tubes
will be judged to be unqualified.
7.6.7 Appearance quality
If the appearance quality of any tube fails, the tube will be deemed unqualified. It is
allowed to cut off the unqualified parts then re-inspect and deliver the qualified parts.
8 Marking, packaging, transportation, storage, and quality
certificate
8.1 Marking
8.1.1 Product marking
Product identification shall comply with the regulations of GB/T 42916.
8.1.2 Packaging box marking
The packaging box marking of tubes shall comply with the regulations of GB/T 3199.
8.2 Packaging, transportation, and storage
The tubes are not packaged with oil, and the packaging method shall be specified in the
order form (or contract); if not specified, it will be a bare package or simple packaging.
Other packaging, transportation, and storage shall comply with the regulations of GB/T
3199.
8.3 Quality Certificate
Each batch of tubes shall be accompanied by a product quality certificate stating:
a) Name of supplier;
b) Product name;
c) Grade, supply state, and dimensions;
d) Product batch number;
e) Net weight;
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.