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GB/T 6892-2023 PDF in English


GB/T 6892-2023 (GB/T6892-2023, GBT 6892-2023, GBT6892-2023)
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GB/T 6892-2023: PDF in English (GBT 6892-2023)

GB/T 6892-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Replacing GB/T 6892-2015
Wrought aluminum and aluminum alloys extruded profiles
for general engineering
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 8
4 Product classification ... 8
5 Technical requirements ... 17
6 Test methods ... 24
7 Inspection rules ... 27
8 Marking, packaging, transportation, storage, quality certificate ... 33
9 Contents of order form (or contract) ... 34
Appendix A (Informative) Guidelines for selection of decorative and general protective
films ... 35
Appendix B (Informative) Dimensional measurement method - Three-dimensional
coordinate measuring instrument method ... 39
Appendix C (Normative) Test method of pin-type support ... 41
Appendix D (Informative) Contents of order form (or contract) ... 48
References ... 56
Wrought aluminum and aluminum alloys extruded profiles
for general engineering
1 Scope
This document specifies the product classification, technical requirements, test methods,
inspection rules, signs, packaging, transportation, storage, quality certificates and order
forms (or contracts) of wrought aluminum and aluminum alloys extruded profiles for
general engineering.
This document is suitable for aluminum and aluminum alloy profiles for general
engineering (hereinafter referred to as profiles).
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated documents, only the versions with the dates
indicated are applicable to this document; for the undated documents, only the latest
version (including all the amendments) is applicable to this standard.
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 232 Metallic materials - Bend test
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/T 3246.1 Inspection method for structure of wrought aluminum and aluminum
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 3251 Compression test method for aluminium and aluminium alloy products
GB/T 5237.2 Wrought aluminium alloy extruded profiles for architecture - Part 2:
Anodized profiles
GB/T 5237.3 Wrought aluminium alloy extruded profiles for architecture - Part 3:
Electrophoretic coating profiles
GB/T 26492.5 Defects for wrought aluminium and aluminium alloys ingots and
products - Part 5: Defects for tubes, rods or bars, profiles, wires
GB/T 32790 Methods for evaluating the weld quality of seam welds in aluminium
and aluminium alloy extrusion
GB/T 34487 Shear testing method of aluminium alloy products for structural
members
GB/T 37616 Aluminium alloys extruded profiles-axial force controlled fatigue
testing method
GB/T 42914 Test method for fracture toughness of aluminium alloy products
GB/T 42916 Identification marking of aluminium and aluminium alloy products
JJG 475 Verification regulation of electronic universal testing machine
YS/T 1630.1-2023 Aviation aluminum alloy pipe, rod, profile - Part 1: 7050
aluminum alloy profile
ISO 15614-2 Specification and qualification of welding procedures for metallic
materials - Welding procedure test - Part 2: Arc welding of aluminum and its alloys
ISO 25239-4 Friction stir welding - Aluminum - Part 4: Specification and
qualification of welding procedures
3 Terms and definitions
The terms and definitions, which are defined in GB/T 8005.1 and GB/T 26492.5, are
applicable to this document.
4 Product classification
4.1 Composition category
The profile is divided into category I and II, according to the composition, as shown in
Table 1.
7 Inspection rules
7.1 Inspection and acceptance
7.1.1 The product shall be inspected by the supplier, to ensure that the product quality
complies with the provisions of this document and the order form (or contract),
meanwhile a quality certificate shall be filled out.
7.1.2 The purchaser shall inspect the received products, in accordance with the
provisions of this document. If the inspection results are inconsistent with the
provisions of this document and the order form (or contract), it shall be submitted to
the supplier in writing, to be resolved through negotiation between the supplier and the
buyer. Objections related to surface quality and dimensional deviation shall be raised,
within 1 month from the date of receipt of the product. Objections to other performance
shall be raised, within 3 months from the date of receipt of the product. If arbitration is
needed, it can be entrusted to an organization, as recognized by both the supplier and
the buyer; sampling can be done jointly at the buyer's premises.
7.2 Group-batching
Products shall be submitted for acceptance in batches. Each batch shall be composed of
products of the same designation, status, size specifications, film layer code, surface
treatment process. When the purchaser requires group-batching according to melting
number and heat treatment furnaces, this shall be noted in the order form (or contract).
7.3 Weighting
Products shall be checked by weight.
7.4 Inspection items and process assurance items
Where there are no special requirements specified in the order form (or contract), the
product exit-factory inspection items, periodic inspection items, process assurance
items shall comply with the provisions of Table 12.
7.6.1 Chemical composition
When the chemical composition of any specimen fails, if the melting order of the profile
can be distinguished, the melting order profile represented by the specimen will be
judged to be unqualified; other melting order profiles will be inspected in sequence, the
qualified ones will be delivered. If the melting order cannot be distinguished, the batch
of profiles is deemed to be unqualified.
7.6.2 Size deviation
If the size deviation of any specimen fails, the batch of profiles will be deemed
unqualified. However, suppliers are allowed to inspect one by one; those that pass the
standard will be delivered.
7.6.3 Tensile mechanical properties at room temperature, compression properties,
bending properties, shear properties, fatigue properties, pin-type support, stress
corrosion resistance, spalling corrosion resistance, intergranular corrosion
sensitivity, salt spray corrosion resistance, welding performance
7.6.3.1 If any specimen fails, the batch (or heat treatment furnace number) of profiles
will be deemed to be unqualified OR shall be implemented in accordance with 7.6.3.2.
7.6.3.2 If the heat treatment furnace number can be distinguished for the profile, it shall
take double quantity of specimens from the heat treatment furnace number, which is
represented by the specimen, to conduct repeated tests on the unqualified item. If the
heat treatment furnace number cannot be distinguished, it shall take double quantity of
specimens from the batch of profiles again, to repeat the test on the unqualified item
(including the profile represented by the unqualified specimen taken for the first time).
If all repeated test results are qualified, the batch (or heat treatment furnace number) of
profiles will be deemed qualified. If there are still unqualified samples in the repeated
test results, the batch (or heat treatment furnace number) of profiles will be deemed
unqualified. After agreement between the supplier and the buyer, the supplier is allowed
to inspect one by one; those that pass the test will be delivered or implemented in
accordance with 7.6.3.3.
7.6.3.3 After repeated heat treatment, the supplier shall inspect all exit-factory
inspection items listed in Table 12 according to the furnace number, except chemical
composition, size deviation, film layer performance, appearance quality. The sampling
quantity shall be as per Table 14. When all inspection results are qualified, the batch of
profiles is deemed to be qualified; otherwise, the batch of profiles is deemed to be
unqualified.
7.6.4 Plane strain fracture toughness
If the plane strain fracture toughness KIc value or "batch release KQ" value of any
specimen fails, the batch (or heat treatment furnace number) of the profile will be
judged to be unqualified or shall be implemented in accordance with 7.6.3.2.
7.6.5 Conductivity
If the conductivity of any specimen fails, follow 7.6.3.2.
7.6.6 Matching relationship between electrical conductivity and mechanical
properties
If the matching relationship between the electrical conductivity and mechanical
properties of any specimen fails, the supplier will inspect each piece one by one; those
that pass will be delivered. OR it is judged according to the test results of stress
corrosion resistance, or implemented in accordance with 7.6.3.2.
7.6.7 Ultrasonic flaw detection acceptance level
If the ultrasonic flaw detection acceptance level of any specimen fails, the profile will
be deemed unqualified.
7.6.8 Welding performance of weld
When the welding performance of the weld is unqualified, it is allowed to cut off a
section from the extrusion front end of the hollow profile, to repeat the test, until it is
qualified. Then other hollow profiles in the batch shall be cut according to the maximum
length of the defect distribution of the inspected profile or one by one; the qualified
products will be delivered.
7.6.9 Macrostructure
When the macrostructure of any specimen fails, the judgment shall be made as follows.
a) If the profile fails due to metallurgical defects, such as cracks, bright grains, non-
metallic inclusions, foreign metal inclusions, white spots, primary crystals, oxide
films, the batch of profiles will be deemed unqualified. However, upon agreement
between the supplier and purchaser, the supplier can inspect one by one and
deliver the qualified products.
b) When unqualified due to layering, tail shrinkage, or coarse grain rings, it is
allowed to cut off a section from the extrusion tail end of the profile, to repeat the
test until it is qualified. Then other profiles in the batch shall be tail cut according
to the maximum length of the defect distribution of the inspected profile or one
by one; the qualified products will be delivered.
c) When the fracture structure of any specimen fails, if the melting order can be
distinguished, the melting order represented by the specimen will be judged to be
unqualified; the other melting order profiles will be inspected in sequence, the
qualified products will be delivered. If the melting orders cannot be distinguished,
the batch of profiles is deemed to be unqualified.
7.6.10 Microstructure
If the microstructure of any specimen is unqualified, the batch (or heat treatment
furnace number) of profiles will be deemed unqualified.
7.6.11 Film performance
When the film performance of any profile fails to meet the standards, it shall be judged
according to the implementation standards selected in Chapter 5.
7.6.12 Appearance quality
If the appearance quality of any profile is unqualified, the profile will be deemed
unqualified.
8 Marking, packaging, transportation, storage, quality
certificate
8.1 Marking
8.1.1 Product marking
Product markings shall comply with the requirements of GB/T 42916.
8.1.2 Packing box markings
The packaging box mark of the profile shall comply with the requirements of GB/T
3199.
8.2 Packaging, transportation, storage
The profiles shall not be greased or packed; other aspects shall comply with the
requirements of GB/T 3199. If the buyer needs applying grease, packing or using other
packing means and methods different from GB/T 3199, it shall be determined through
negotiation between the supplier and the purchaser. Meanwhile it shall be indicated in
the order form (or contract). The transportation and storage of profiles shall comply
with the requirements of GB/T 3199.
8.3 Quality certificate
Each batch of profiles shall be accompanied by a product quality certificate, which shall
indicate:
a) Name of supplier;
A.2.2.2 Anodized composite film
The anodized composite film is composed of an anodized film and an organic polymer
film. Due to the presence of the aluminum anodized film, it is not susceptible to
mechanical damage to the metal matrix AND is not prone to filamentous corrosion
under the film. Industrial and urban environments with serious pollution should choose
high-quality grade anodized composite films.
A.2.2.3 Sprayed film
When the surface of the sprayed film is wet, performance degradation is prone to occur
due to the presence of acidic substances in the air; the damage is particularly prominent
in heavily polluted industrial areas. Being in a damp heat environment for a long time
will accelerate the permeability of water and harmful ions to the film layer. Mechanical
damage can also accelerate film erosion in industrial and urban environments.
Therefore, in humid tropical environments with serious industrial and urban pollution,
it should choose high-quality sprayed films, such as highly weather-resistant powder
spray films or fluorocarbon paint spray films.
A.2.3 Marine environment
A.2.3.1 Anodized film
Under environmental conditions without acid pollution, the anodized film has good salt
water resistance. However, if acidic environmental conditions cause local dissolution
of the film, the presence of chloride ions will accelerate the corrosion of the aluminum
substrate. In marine environment areas with large temperature differences, it should
choose high-thickness anodized films.
A.2.3.2 Anodized composite film
The anodized composite film is composed of an anodized film and an organic polymer
film. Due to the presence of the aluminum anodized film, it is not susceptible to
mechanical damage to the metal matrix AND is not prone to filamentous corrosion
under the film. In industrial and urban environments with serious pollution, it shall
choose high-quality grade composite films.
A.2.3.3 Sprayed film
There are chloride ions in the marine environment; the chloride ions will slowly
penetrate the surface of the aluminum matrix and cause the performance of the film to
decline. Being in a damp heat environment for a long time and the presence of other
ions will increase the permeability of the film layer. Mechanical damage will accelerate
the erosion of chloride ions on the substrate. Therefore, in humid tropical marine
environments, it should choose high-quality sprayed films, such as highly weather-
resistant powder film spray films or fluorocarbon paint spray films.
Appendix B
(Informative)
Dimensional measurement method - Three-dimensional coordinate measuring
instrument method
B.1 Method overview
By positioning the probe and the workpiece, record the three-dimensional coordinates
of the positioning points; calculate the difference in the three-dimensional coordinates
of different positioning points on the workpiece surface, to obtain the required length,
height, volume or area and other dimensions.
B.2 Test conditions
B.2.1 Ambient temperature: 20 °C ± 2 °C.
B.2.2 Environmental relative humidity: 60% ± 5%.
B.2.3 Working air pressure: Depends on the equipment requirements. The flow rate of
compressed air is not less than 0.0017 m3/s; the air source pressure is not less than 0.6
MPa; the temperature of the compressed air entering the host is 20 °C ± 5 °C; the
relative humidity is not greater than 15%.
B.3 Instruments and equipment
The three-dimensional coordinate measuring instrument mainly consists of a host (host
support, guide rails, driving device, workbench), pneumatic system (air bearing system,
pneumatic control device, Z-axis pneumatic balance), electrical system, standard ball,
measuring probe, measurement software system. The grating resolution is not greater
than 0.1 μm; the detection error is not greater than 3 μm.
B.4 Specimen
The surface of the specimen is clean and free of defects, such as flash, burrs, particles
that may affect the measurement results.
B.5 Test steps
B.5.1 Before measurement, let the specimen stand still in the test environment, so that
the difference between the specimen temperature and the ambient temperature is not
greater than 2 °C.
B.5.2 Turn on the three-coordinate measuring instrument; stabilize it for 30 minutes.
B.5.3 According to the measurement requirements, select appropriate probes and
fixtures.
Appendix D
(Informative)
Contents of order form (or contract)
D.1 The order form (or contract) for profiles without surface treatment shall include the
following:
a) Product name;
b) Designation;
c) Status;
d) Section code and length;
e) Weight;
f) Special requirements of the buyer:
• Brinell hardness,
• Ultrasonic flaw detection performance,
• Conductivity,
• Stress corrosion resistance,
• Spalling corrosion resistance,
• Intergranular corrosion susceptibility,
• Salt spray corrosion resistance,
• Bending properties,
• Shearing performance,
• Compression performance,
• Fatigue performance,
• Fatigue crack growth rate,
• Plane strain fracture toughness,
• Pin-type support,
• Modulus of elasticity,
• Welding performance,
• Weld seam welding performance,
• Packaging requirements,
• Other special requirements;
g) This document number.
D.2 The order form (or contract) for anodized profiles shall include the following:
a) The purpose, type, treatment method of the film layer;
b) Texture type;
c) Environmental grade of the use environment;
d) Effective surface of product film;
e) Contact area location and maximum size;
f) Hole-sealing method;
g) Sampling requirements;
h) Film layer code;
i) Color (or color code);
j) Color difference;
k) Film thickness;
l) Hole-sealing quality;
m) Appearance quality;
n) Special requirements of the buyer:
• Gloss,
• Hardness,
• Preprocessing type,
• Etching amount,
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.