GB/T 40319-2021 PDF English
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Wrought aluminum alloy sheets, strips and foils for drawn cans
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GB/T 40319-2021: Wrought aluminum alloy sheets, strips and foils for drawn cans---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/GBT40319-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
CCS H 61
Wrought aluminum alloy sheets, strips and foils for drawn
cans
Issued on. AUGUST 20, 2021
Implemented on. MARCH 01, 2022
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Classification... 6
5 Quality assurance... 9
6 Requirements... 9
7 Test methods... 16
8 Inspection rules... 23
9 Marking, packaging, transportation, storage, quality certificate... 29
10 Contents of order (or contract)... 30
Appendix A (Informative) Product quality assurance... 32
Appendix B (Normative) Thickness detection method... 38
Appendix C (Normative) Straightness test method... 41
Appendix D (Normative) Determination of surface oil content... 43
Appendix E (Normative) Determination of the content of main elements in the film 46
Appendix F (Normative) Determination of coating surface density... 47
Appendix G (Normative) Copper sulfate test method for scraper simulated coating.. 52
References... 54
1 Scope
This document specifies the classification, quality assurance, requirements, test
methods, inspection rules, marking, packaging, transportation, storage, quality
certificate and order (or contract) content of aluminum alloy sheets, strips, foils for
drawn cans.
This document is applicable to aluminum alloy sheets (hereinafter referred to as sheets),
aluminum alloy strips (hereinafter referred to as strips), aluminum alloy foils
(hereinafter referred to as foils) for food packaging cans (bottles), which are produced
by drawing and wall ironing, shallow drawing and deep drawing, and for can (bottle)
caps and pull rings used therewith.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 1732 Determination of impact resistance of coating films
GB/T 2523 Measuring method of surface roughness and peak count for cold-rolled
metal sheet (strip)
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 3880.3 Wrought aluminium and aluminium alloy sheets, sheets and strips for
general engineering - Part 3.Tolerances on forms and dimensions
GB/T 5125 Method for deep drawing cups testing of non-ferrous metals
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 7999 Optical emission spectrometric analysis method of aluminum and
aluminum alloys
3 Terms and definitions
The terms and definitions defined in GB/T 8005.1, GB/T 26492.3, GB/T 26492.4, as
well as the following terms and definitions, apply to this document.
3.1
Drawing and wall ironing
The process of forming deep concave parts by plastic flow of thin sheet/thick foil
metal between dies and thinning of the wall thickness of the thin sheet.
3.2
Shallow drawing
The process of forming shallow concave parts (the ratio of can height to can
diameter is less than 1) by plastic flow of thin sheet/thick foil metal between dies
(usually the wall thickness of thin sheet/thick foil does not become thinner).
3.3
Deep drawing
The process of forming deep concave parts (the ratio of can height to can diameter
is not less than 1) by multiple plastic flows of thin sheet metal between dies (usually
the wall thickness of thin sheet does not become thinner).
4 Classification
4.1 Product use
Products are divided into three categories according to their use. See Table 1 for product
use and use code.
4.2 Designation, state, size specification
The product designation, state, size specification and its corresponding use code are
shown in Table 2.When the buyer needs other designations, states, size specifications,
they shall be determined by negotiation between the supplier and the buyer and
indicated in the order form (or contract).
4.3 Product surface type
The product surface type, surface type code and its corresponding treatment process
and use code are shown in Table 3.
5 Quality assurance
5.1 Food safety assurance
5.2 Product quality assurance
For product quality assurance, refer to Appendix A.
6 Requirements
6.1 Chemical composition
The chemical composition of 5151 designation shall comply with the provisions of
Table 4; the chemical composition of other designations shall comply with the
provisions of GB/T 3190.
6.2 Dimensional deviation
6.2.1 Thickness
The thickness deviation of the product shall comply with the provisions of Table 5.
6.2.3 Length
The allowable deviation of the length of the sheet shall be ; if the purchaser
has special requirements for the allowable deviation of the length of the sheet, it shall
be determined by negotiation between the supplier and the buyer and indicated in the
order (or contract).
6.2.4 Diagonal
The difference between the two diagonal lengths of the sheet shall not exceed 2.0 mm.
6.2.7 Unevenness
The unevenness of the product shall comply with the provisions of Table 7; if the
purchaser has special requirements for unevenness, it shall be determined by
negotiation between the supplier and the buyer and indicated in the order (or contract).
6.2.8 Straightness
When strip and foil shapes are tested offline, the straightness testing value after
tensioning correction shall not be greater than 10I;
6.3 Tensile mechanical properties
6.3.1 Room temperature tensile mechanical properties
The room temperature tensile mechanical properties of the product shall comply with
the provisions of Table 8.
7 Test methods
7.1 Chemical composition
7.1.1 Routine chemical analysis shall be conducted for elements with numerical values
other than the "Al" and "Other" columns of the corresponding designations in Table 4
and GB/T 3190.When it is suspected that the mass fraction of non-routine analysis
elements exceeds the limit value of this document, the manufacturer shall analyze these
elements.
7.2 Dimension deviation
7.2.1 Dimension rounding
Dimension measurement values are not allowed to be rounded off; the method for
determining the limit value shall comply with the provisions of 3.2 and 3.3 in GB/T
8170-2008.
7.2.2 Thickness
Test according to the method specified in Appendix B; the arbitration method shall be
the weight method.
7.2.3 Width, length, diagonal
Measure with measuring tools of corresponding accuracy.
7.2.4 Side curvature
Test according to the method specified in GB/T 3880.3.
7.2.6 Unevenness
Take a whole sheet or cut a specimen of 1500 mm ~ 1800 mm in length from a strip or
foil (the specimen shall include the wave part of the product as much as possible). Place
the specimen freely on the platform. Test the wave height and wave number according
to the method specified in GB/T 3880.3.The wave height is measured using a feeler
gauge with a resolution of 0.1 mm; the wave distance is measured using a tool with a
resolution of 1 mm.
7.2.10 Others
Use measuring tools of corresponding accuracy for testing.
7.3 Tensile mechanical properties
7.3.1 Room temperature tensile mechanical properties
Test according to the method specified in GB/T 16865.
7.3.2 Room temperature tensile mechanical properties after simulated baking
7.3.2.3 Take out the specimen and cool it to room temperature. Determine the room
temperature tensile mechanical properties after simulated baking according to the
method specified in GB/T 16865.
7.4 Deep drawing performance
Test the earing rate according to the method specified in GB/T 5125.
7.5 Surface oil content
7.5.1 The amount of pre-coated oil on one side shall be determined according to the
method specified in Appendix D. The arbitration method shall be the weight method.
7.7 Coating performance
7.7.1 Surface density
It shall be measured according to the method specified in Appendix F. The arbitration
method shall be the weight method.
7.7.2 Solvent resistance (MEK)
7.7.2.1 At room temperature, wrap a 1 kg heavy hammer with at least six layers of gauze
(the contact area between the hammer head and the specimen surface is about 400 mm2).
7.7.3 Impact resistance
7.7.3.1 Weigh 50 g of anhydrous copper sulfate and place it in a beaker. Add a small
amount of water to dissolve it. Then add 100 mL of hydrochloric acid (ρ = 1.19 g/mL);
transfer it to a 1000 mL volumetric flask; dilute it to the scale with water; mix it well;
prepare a 50 g/L copper sulfate solution.
7.7.4 Adhesion
7.7.4.1 Dry adhesion
7.7.4.1.1 Crosshatch according to GB/T 9286, with a grid spacing of 1 mm.
7.7.7 Sulfur resistance
7.7.7.1 Mixed solution method
7.7.7.1.1 Weigh 0.50 g of L-cysteine hydrochloride (C3H8NO2SCl) or 0.56 g of
monohydrate L-cysteine hydrochloride (C3H8NO2SCl·H2O), 3.6 g of potassium
dihydrogen phosphate dodecahydrate (KH2PO4·12H2O), 7.2 g of disodium hydrogen
phosphate dodecahydrate (Na2HPO4·12H2O); mix and dissolve in grade 3 water
specified in GB/T 6682; dilute to 1000 mL to prepare a mixed solution. The mixed
solution shall be used within 4 hours after preparation.
7.7.9 Alcohol resistance
Add 100 mL of grade 3 water specified in GB/T 6682 to 100 mL of anhydrous ethanol,
to dilute to an alcohol solution with a volume fraction of 50%. The temperature of the
alcohol solution shall be determined in Table 14 in this document or agreed upon by the
supplier and the buyer. Immerse the specimen in the alcohol solution. The test time shall
be determined according to Table 14 in this document or agreed upon by both parties.
After the test, take out the specimen and let it dry naturally. Visually inspect the inner
surface coating.
7.8 Wax coating amount
7.8.1 Take five 100 mm × 100 mm square or 100 mm diameter circular specimens on
each sample.
9 Marking, packaging, transportation, storage, quality certificate
9.1 Marking
9.1.1 Product marking
The qualified products shall be marked with the following contents (or a label
containing the following contents).
9.1.2 Packaging marking
It shall comply with the provisions of GB/T 3199.
9.2 Packaging, transportation and storage
9.3 Quality certificate
Each batch of products shall be accompanied by a product quality certificate, which
shall include the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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