GB/T 33369-2016 PDF in English
GB/T 33369-2016 (GB/T33369-2016, GBT 33369-2016, GBT33369-2016)
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Aluminium alloy clad sheets, strips and foils for brazing
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Standards related to (historical): GB/T 33369-2016
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GB/T 33369-2016: PDF in English (GBT 33369-2016) GB/T 33369-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
H 61
Aluminum alloy clad sheets, strips and foils for
brazing
ISSUED ON: DECEMBER 30, 2016
IMPLEMENTED ON: NOVEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Requirements ... 6
5 Test method ... 16
6 Inspection rules ... 19
7 Marking, packaging, transportation, storage and quality certificate ... 21
8 Purchase order (or contract) content ... 22
Appendix A (Informative) Typical designations, status, clad ratio, size
specifications of clad foils for fins, clad strips for pipe making, clad sheets for
deep drawing ... 24
Appendix B (Informative) Solid, liquid phase line temperature and brazing
temperature of composite material matrix and cladding alloy ... 25
Appendix C (Informative) Representation of composite material code ... 26
Aluminum alloy clad sheets, strips and foils for
brazing
1 Scope
This standard specifies the requirements, test methods, inspection rules and
markings, packaging, transportation, storage, quality certificates and purchase
orders (or contracts) of aluminum alloy clad sheets, strips and foils for brazing.
This standard applies to aluminum alloy clad sheets, strips and foils for brazing
(hereinafter referred to as clad materials).
2 Normative references
The following documents are essential to the application of this document. 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) are applicable to this standard.
GB/T 3190 Wrought aluminum and aluminum alloy - Chemical composition
GB/T 3199 Wrought aluminum and aluminum 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 3880.3 Wrought aluminum and aluminum alloy plates, sheets and
strips for general engineering - Part 3: Tolerances on forms and dimensions
GB/T 4156 Metallic materials - Sheet and strip - Erichsen cupping test
GB/T 7999 Optical emission spectrometric analysis method of aluminum and
aluminum alloys
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 16865 Test pieces and method for tensile test for wrought aluminum
and magnesium alloys products
GB/T 17432 Methods for sampling for analyzing the chemical composition
of wrought aluminum and aluminum alloys
GB/T 20975 (all parts) Methods for chemical analysis of aluminum and
aluminum alloys
GB/T 27675 Designation system for aluminum and aluminum alloys
composite sheets, strips and foils
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Aluminum alloy clad sheets
Sheets made of two or more aluminum alloy materials after rolling and
compounding.
3.2
Aluminum alloy clad strip, foils
Strips and foils made of two or more aluminum alloy materials after rolling
and compounding (hereinafter referred to as coils).
3.3
Cladding
Cladding layer for brazing in composite materials.
3.4
Matrix alloy
A core layer that plays a structural role or has a special role in composite
materials.
3.5
Clad ratio
The percentage of the thickness of a single cladding layer to the total
thickness of the clad, which is calculated according to formula (1).
and the chemical composition of each matrix component layer; calculate to
determine the chemical composition of the brazing layer of the sample blank.
5.1.4 For 3A11, 3B11, 4A43, 4A45, 4104, 6951, 7A11, carry out routine
chemical analysis only on elements with numerical requirements outside the
"Al" and "other impurities" columns in Table 3. When the quality score of
unconventional analysis elements is suspected to exceed the limit value of this
standard, the producer shall analyze these elements.
5.1.5 The "Al" content is calculated according to the method specified in GB/T
3190. When calculating the "Al" content, the sum of the analysis values of
conventional analysis elements and suspected excessive unconventional
analysis elements is taken as the "sum of element content".
5.1.6 The analysis value is judged by the rounding comparison method; the
numerical rounding rules are carried out in accordance with the relevant
provisions of GB/T 8170. The rounding off digits shall be consistent with the
limit digits as specified in Table 2 of this standard or GB/T 3190.
5.2 Deviation of clad ratio
The inspection method for the coverage of composite materials shall be
implemented in accordance with GB/T 3246.1.
5.3 Dimensional deviation
5.3.1 Thickness
Composite materials which have a thickness less than or equal to 0.130 mm
are measured by the use of a micrometer which has a scale value not greater
than 0.001 mm; composite materials which have a thickness greater than 0.130
mm and less than or equal to 0.250 mm are measured by a micrometer which
has a scale value not greater than 0.002 mm; composite materials which have
a thickness of larger than 0.250 mm should be measured by a micrometer (or
a measuring tool with the same accuracy) which has a measurement accuracy
of not less than 0.01 mm.
5.3.2 Width
The width of the composite material is measured by a steel strip which has an
accuracy of 1 mm or a tool which has corresponding accuracy.
5.3.3 Length
The length of the clad sheet is measured by a steel strip which has an accuracy
of 1 mm or a tool which has corresponding accuracy.
The length and inner diameter of the tube core are measured by a measuring
tool that can ensure accuracy. The core material is guaranteed by the supplier;
other items are visually inspected.
5.7 Appearance quality
Under natural scattered light, visually inspect the appearance quality. When
necessary, the size measurement tool can be used to define the size of the
defect, the depth of the defect can be determined by grinding.
6 Inspection rules
6.1 Inspection and acceptance
6.1.1 The product shall be inspected by the supplier, to ensure that the product
quality meets the requirements of this standard and the purchase order (or
contract); meanwhile fill in the quality certificate.
6.1.2 The purchaser shall inspect the products received in accordance with the
provisions of this standard. When the inspection result is inconsistent with the
provisions of this standard and the purchase order (or contract), it shall be
submitted in writing to the supplier, to be settled by the supplier and the buyer
through negotiation. Objections related to appearance quality and size
deviation shall be raised within one month from the date of receipt of the product;
objections related to other properties shall be raised within 3 months from the
date of receipt of the product. If arbitration is required, it can be entrusted to an
organization as recognized by both the supplier and the buyer; samples will be
taken together at the buyer's premise.
6.2 Group-batch
Products shall be submitted for acceptance in batches; each batch shall be
composed of products of the same designation (or code), state, size
specifications. The weight of each batch is unlimited.
6.3 Weighing
The product shall be weighed based on kilogram.
6.4 Inspection items
Each batch of composite materials shall be tested for chemical composition,
clad ratio deviation, size deviation, room temperature tensile mechanical
properties, cupping properties, tube core and appearance quality.
6.5 Sampling
unqualified specimen properties in the repeated test results, the batch (furnace)
of product is judged as unqualified. Upon agreement between the supplier and
the buyer, the supplier is allowed to inspect one by one and roll by roll, the
qualified ones are delivered.
6.6.5 When the cupping performance of any specimen is unqualified, it shall,
from the batch (furnace) of products (including the product represented by the
unqualified sample) (or on the product represented by the unqualified sample),
take another double number of specimens to repeat the test. When the
repeated test results are all qualified, then the batch (furnace) of products are
judged to be qualified. If there are still unqualified specimen properties in the
repeated test results, the batch (furnace) of product is judged as unqualified.
Upon agreement between the supplier and the buyer, the supplier is allowed to
inspect one by one, the qualified ones are delivered.
6.6.6 When the tube core of any product is unqualified, the batch of products
shall be deemed unqualified. Upon agreement between the supplier and the
buyer, inspection is allowed on a roll-by-roll basis; those that pass the test will
be delivered.
6.6.7 When the appearance quality of any product is unqualified, the batch of
products shall be deemed unqualified. Upon agreement between the supplier
and the buyer, inspections are allowed one by one and roll by roll; those that
pass the test will be delivered.
7 Marking, packaging, transportation, storage and
quality certificate
7.1 Marking
7.1.1 Product mark
7.1.1.1 The following marks (or labels) shall be printed on the upper and lower
3 sheet stacks that have passed the inspection, or on each roll of strip or foil:
a) Product name;
b) Designation;
c) Status;
d) Size specifications;
e) Product batch number or coil number;
f) Net weight;
g) The inspection seal of the supplier's quality inspection department (or the
signature or seal of the quality inspector).
7.1.1.2 Single-sided composite materials shall be marked (such as scribed) on
the brazing surface of each sheet, strip and foil.
7.1.2 Packing box mark
The packaging box mark of the product shall meet the requirements of GB/T
3199.
7.2 Packaging, transportation and storage
The sheets are not greased; there is no paper packing between the sheets.
When the buyer requires grease or paper pad, it shall be indicated in the order
form (or contract). The packaging method of strip and foil is indicated in the
order form (or contract). Other packaging, transportation, storage requirements
are in accordance with GB/T 3199.
7.3 Quality certificate
Each batch of composite materials shall be accompanied by a product quality
certificate, which shall indicate:
a) The name of the supplier;
b) Product name;
c) Designation, status, size specification and clad ratio;
d) Batch number or coil number;
e) Net weight and quantity;
f) Number of this standard;
g) The analysis and inspection results and the inspection seal of the
supplier's quality inspection department;
h) Packing date (or exit-factory date).
8 Purchase order (or contract) content
The order form (or contract) for ordering materials as covered in this standard
shall include the following:
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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