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GB/T 40319-2021 English PDF (GBT40319-2021)
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GB/T 40319-2021: Wrought aluminum alloy sheets, strips and foils for drawn cans
GB/T 40319-2021
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
Wrought aluminum alloy sheets, strips and foils for drawn
cans
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
GB/T 8005.1 Aluminium and aluminium alloy terms and definitions - Part 1:
Product and method of processing and treatment
GB/T 8170-2008 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9286 Paints and varnishes - Cross-cut test
GB/T 16865 Test pieces and method for tensile test for wrought aluminium and
magnesium alloys 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 26492.3 Defects of wrought aluminium and aluminium alloys ingots and
products - Part 3: Defects for sheets, sheets and strips
GB/T 26492.4 Defects for wrought aluminium and aluminium alloys ingots and
products - Part 4: Defects for foils
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.
[Source: GB/T 8005.1-2019, 3.3.45]
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).
or scratched; the edges shall not have cracks, warping or burrs.
6.9.3 Strips and foils shall not have collapsed rolls or bird's nest defects.
6.9.4 Strips and foils on coated surfaces and coated waxed surfaces are allowed to have
one splicing joint, which shall be glued with tape. There shall be no loose layers or
displacement at the joints. The joints shall be marked on the end faces; the number of
joint rolls in each batch shall not exceed 10% of the total number of rolls. Other surface
types of strips and foils are not allowed to have joints.
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.
7.1.2 The chemical composition analysis method shall comply with the provisions of
GB/T 20975 or GB/T 7999; the arbitration analysis shall adopt the method specified in
GB/T 20975. The "Al" content and the "Total" value in "Others" shall be calculated
according to the method specified in GB/T 3190.
7.1.3 The rounding comparison method shall be used to determine the analysis value;
the numerical rounding rules shall be carried out according to the provisions of 3.2 and
3.3 in GB/T 8170-2008; the rounding digits shall be consistent with the limit digits
specified in Table 4 of this document or GB/T 3190.
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.
7.2.5 Warping height of end part
Take a whole sheet or cut a section of specimen with a length of 1500 mm ~ 1800 mm
from the strip or foil; place the specimen freely on the platform; measure the height
between the end of the specimen length and the platform with a feeler gauge, 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.
7.2.7 Straightness
Use a sheet shape meter to detect the online belt tension; test according to the method
specified in Appendix C during arbitration.
7.2.8 Staggered layers and tower shapes
Use measuring tools of corresponding accuracy for measurement.
7.2.9 Average surface roughness
Use a roughness meter with a resolution of 0.001 μm, to carry out test according to the
method specified in GB/T 2523.
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
7.3.2.1 Heat the heat treatment furnace with a control accuracy of ±2 °C to 205 °C and
keep it warm.
7.3.2.2 Place the specimen in the heat treatment furnace for baking. The 3104 grade
drawing and wall ironing can (bottle) body material is baked according to the baking
time specified by the supplier and the buyer in the order form (or contract). The baking
time of products for other purposes shall be implemented according to the provisions
of Table 9.
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.
7.5.2 The single-side residual oil and single-side protection (DOS) oil shall be measured
by the weight method in Appendix D.
7.6 Main element content of the film layer
It shall be measured according to the method specified in Appendix E.
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).
7.7.2.2 After saturating with butanone, wipe the specimen surface along the same
straight line at a rate of 1 round trip per second. One round trip is counted as 1 time.
The number of wiping times shall be determined by negotiation between the supplier
and the buyer and shall be indicated in the order (or contract). The wiping stroke is
about 100 mm. The gauze shall be kept moist during the test.
7.7.2.3 After the test, visually inspect the inner surface coating.
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.
7.7.3.2 Embed a steel ball with a diameter of 8 mm ± 0.3 mm on a weight of 1000 g ±
5 g; perform an impact test according to the method specified in GB/T 1732. Place the
weight at a height of 50 cm ± 1 cm; let it fall freely to impact the inner surface coating
of the specimen.
7.7.3.3 Completely immerse the specimen in a constant temperature water bath (water
bath method) or autoclave (cooking method), which is filled with grade 3 water
specified in GB/T 6682. Perform the test at the test temperature and test time agreed
upon by the supplier and the buyer.
7.7.3.4 After depressurization, remove the specimen; wipe it dry immediately; drop
copper sulfate solution on the concave part of the specimen where it was impacted; use
a 4× magnifying glass to visually observe whether there are bubbles or copper
precipitation.
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.
7.7.4.1.2 Cover the crosshatch coating by an adhesive tape with an adhesion greater
than 10 N/25 mm 1) and press it to exhaust the air under the tape. Pull up the tape
quickly at an angle perpendicular to the coating surface; then rate it according to GB/T
9286.
7.7.4.2 Wet Adhesion
Determine the test temperature and test time according to Table 14 or agree upon by
both the supplier and the buyer; select a cooking device (constant temperature water
bath or autoclave) for the test. Completely immerse the specimen in a cooking device
filled with grade 3 water specified in GB/T 6682 for the cooking test; remove and dry
the specimen; then test and rate it according to 7.7.4.1 in this document.
1 The Scotch 610 tape or Permacel 99 tape are examples of suitable commercially available products. This
information is given for the convenience of users of this document and does not represent an endorsement of these
products.
test time determined in Table 14 or agreed upon by the supplier and the buyer. After the
pressure is released, take out the specimen and visually inspect the inner surface coating
after cooling.
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.
7.7.7.1.2 Pour the mixed solution into a glass beaker and immerse the specimen in the
solution. Cover the glass beaker with aluminum foil and place the glass beaker in an
autoclave. Perform a boiling test at the test temperature and time determined in Table
14 or agreed upon by the supplier and the buyer. Remove the specimen after
depressurization; visually inspect the inner surface coating after cooling.
7.7.7.2 Sodium sulfide solution method
7.7.7.2.1 Weigh 0.50 g of sodium sulfide; dissolve and dilute to 1000 mL with grade 3
water specified in GB/T 6682, to prepare a 0.5 g/L sodium sulfide solution.
7.7.7.2.2 Pour the sodium sulfide solution into a glass beaker; immerse the specimen in
the solution. Cover the glass beaker with aluminum foil; place the glass beaker in an
autoclave. Perform a boiling test at the test temp...
Get Quotation: Click GB/T 40319-2021 (Self-service in 1-minute)
Historical versions (Master-website): GB/T 40319-2021
Preview True-PDF (Reload/Scroll-down if blank)
GB/T 40319-2021: Wrought aluminum alloy sheets, strips and foils for drawn cans
GB/T 40319-2021
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
Wrought aluminum alloy sheets, strips and foils for drawn
cans
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
GB/T 8005.1 Aluminium and aluminium alloy terms and definitions - Part 1:
Product and method of processing and treatment
GB/T 8170-2008 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9286 Paints and varnishes - Cross-cut test
GB/T 16865 Test pieces and method for tensile test for wrought aluminium and
magnesium alloys 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 26492.3 Defects of wrought aluminium and aluminium alloys ingots and
products - Part 3: Defects for sheets, sheets and strips
GB/T 26492.4 Defects for wrought aluminium and aluminium alloys ingots and
products - Part 4: Defects for foils
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.
[Source: GB/T 8005.1-2019, 3.3.45]
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).
or scratched; the edges shall not have cracks, warping or burrs.
6.9.3 Strips and foils shall not have collapsed rolls or bird's nest defects.
6.9.4 Strips and foils on coated surfaces and coated waxed surfaces are allowed to have
one splicing joint, which shall be glued with tape. There shall be no loose layers or
displacement at the joints. The joints shall be marked on the end faces; the number of
joint rolls in each batch shall not exceed 10% of the total number of rolls. Other surface
types of strips and foils are not allowed to have joints.
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.
7.1.2 The chemical composition analysis method shall comply with the provisions of
GB/T 20975 or GB/T 7999; the arbitration analysis shall adopt the method specified in
GB/T 20975. The "Al" content and the "Total" value in "Others" shall be calculated
according to the method specified in GB/T 3190.
7.1.3 The rounding comparison method shall be used to determine the analysis value;
the numerical rounding rules shall be carried out according to the provisions of 3.2 and
3.3 in GB/T 8170-2008; the rounding digits shall be consistent with the limit digits
specified in Table 4 of this document or GB/T 3190.
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.
7.2.5 Warping height of end part
Take a whole sheet or cut a section of specimen with a length of 1500 mm ~ 1800 mm
from the strip or foil; place the specimen freely on the platform; measure the height
between the end of the specimen length and the platform with a feeler gauge, 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.
7.2.7 Straightness
Use a sheet shape meter to detect the online belt tension; test according to the method
specified in Appendix C during arbitration.
7.2.8 Staggered layers and tower shapes
Use measuring tools of corresponding accuracy for measurement.
7.2.9 Average surface roughness
Use a roughness meter with a resolution of 0.001 μm, to carry out test according to the
method specified in GB/T 2523.
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
7.3.2.1 Heat the heat treatment furnace with a control accuracy of ±2 °C to 205 °C and
keep it warm.
7.3.2.2 Place the specimen in the heat treatment furnace for baking. The 3104 grade
drawing and wall ironing can (bottle) body material is baked according to the baking
time specified by the supplier and the buyer in the order form (or contract). The baking
time of products for other purposes shall be implemented according to the provisions
of Table 9.
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.
7.5.2 The single-side residual oil and single-side protection (DOS) oil shall be measured
by the weight method in Appendix D.
7.6 Main element content of the film layer
It shall be measured according to the method specified in Appendix E.
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).
7.7.2.2 After saturating with butanone, wipe the specimen surface along the same
straight line at a rate of 1 round trip per second. One round trip is counted as 1 time.
The number of wiping times shall be determined by negotiation between the supplier
and the buyer and shall be indicated in the order (or contract). The wiping stroke is
about 100 mm. The gauze shall be kept moist during the test.
7.7.2.3 After the test, visually inspect the inner surface coating.
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.
7.7.3.2 Embed a steel ball with a diameter of 8 mm ± 0.3 mm on a weight of 1000 g ±
5 g; perform an impact test according to the method specified in GB/T 1732. Place the
weight at a height of 50 cm ± 1 cm; let it fall freely to impact the inner surface coating
of the specimen.
7.7.3.3 Completely immerse the specimen in a constant temperature water bath (water
bath method) or autoclave (cooking method), which is filled with grade 3 water
specified in GB/T 6682. Perform the test at the test temperature and test time agreed
upon by the supplier and the buyer.
7.7.3.4 After depressurization, remove the specimen; wipe it dry immediately; drop
copper sulfate solution on the concave part of the specimen where it was impacted; use
a 4× magnifying glass to visually observe whether there are bubbles or copper
precipitation.
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.
7.7.4.1.2 Cover the crosshatch coating by an adhesive tape with an adhesion greater
than 10 N/25 mm 1) and press it to exhaust the air under the tape. Pull up the tape
quickly at an angle perpendicular to the coating surface; then rate it according to GB/T
9286.
7.7.4.2 Wet Adhesion
Determine the test temperature and test time according to Table 14 or agree upon by
both the supplier and the buyer; select a cooking device (constant temperature water
bath or autoclave) for the test. Completely immerse the specimen in a cooking device
filled with grade 3 water specified in GB/T 6682 for the cooking test; remove and dry
the specimen; then test and rate it according to 7.7.4.1 in this document.
1 The Scotch 610 tape or Permacel 99 tape are examples of suitable commercially available products. This
information is given for the convenience of users of this document and does not represent an endorsement of these
products.
test time determined in Table 14 or agreed upon by the supplier and the buyer. After the
pressure is released, take out the specimen and visually inspect the inner surface coating
after cooling.
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.
7.7.7.1.2 Pour the mixed solution into a glass beaker and immerse the specimen in the
solution. Cover the glass beaker with aluminum foil and place the glass beaker in an
autoclave. Perform a boiling test at the test temperature and time determined in Table
14 or agreed upon by the supplier and the buyer. Remove the specimen after
depressurization; visually inspect the inner surface coating after cooling.
7.7.7.2 Sodium sulfide solution method
7.7.7.2.1 Weigh 0.50 g of sodium sulfide; dissolve and dilute to 1000 mL with grade 3
water specified in GB/T 6682, to prepare a 0.5 g/L sodium sulfide solution.
7.7.7.2.2 Pour the sodium sulfide solution into a glass beaker; immerse the specimen in
the solution. Cover the glass beaker with aluminum foil; place the glass beaker in an
autoclave. Perform a boiling test at the test temp...
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