GB/T 2520-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 2520-2017 | English | 145 |
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Cold-reduced Electrolytic Tinplate
| Valid |
| GB/T 2520-2008 | English | 85 |
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Cold-reduced electrolytic tinplate
| Obsolete |
| GB/T 2520-2000 | English | 679 |
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Cold-reduced electrolytic tinplate
| Obsolete |
| GB/T 2520-1988 | English | RFQ |
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Tin electroplated steel sheets and strips
| Obsolete |
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GB/T 2520-2017: Cold-reduced Electrolytic Tinplate---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/GBT2520-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Cold-reduced Electrolytic Tinplate
Issued on. SEPTEMBER 7, 2017
Implemented on. JUNE 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Application Scope... 5
2 Normative References... 5
3 Terms and Definitions... 7
4 Classification and Codes... 9
5 Ordering Content... 10
6 Dimensions, Shapes, Weights and Tolerances... 10
7 Technical Requirements... 13
8 Test Methods... 18
9 Inspection Rules... 20
10 Packaging, Marking and Quality Certification... 20
11 Cross-reference of temper degree codes of domestic and overseas
standards... 20
12 Precautions for use of tinplate... 21
Annex A (Normative) Method for Marking of Thick Face of Differentially Coated
Electrolytic Tinplate... 22
Annex B (Informative) Spring-back Test Method... 23
Annex C (Normative) Table of Conversion between HR15Tm and HR30Tm. 25
Annex D (Informative) Cross-reference of Temper Degree Codes of Domestic
and Overseas Standards... 26
Annex E (Informative) Precautions for Use of Tinplate... 27
Annex F (Normative) Determination of Lead Content in the Coating of Tinplate
... 28
1 Application Scope
This Standard specifies the classification and codes, ordering content, dimensions,
shapes, weights and tolerances, technical requirements, test methods, inspection
rules, packaging, marking and quality certification of cold-reduced electrolytic tinplate.
This Standard applies to single cold-reduced electrolytic tinplate of nominal thickness
0.14 mm ~ 0.80 mm and double cold-reduced electrolytic tinplate of nominal thickness
0.12 mm ~ 0.36 mm (hereinafter referred to as tinplate).
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this Standard.
GB/T 222, Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.4, Iron, Steel and Alloy – Determination of Manganese Content –
Potentiometric or Visual Titration Method
GB/T 223.5, Steel and Iron – Determination of Acid-soluble Silicon and Total Silicon
Content – Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9, Iron, Steel and Alloy – Determination of Aluminium Content – Chrom
Azurol S Photometric Method
3 Terms and Definitions
3.1
electrolytic tinplate
Cold-reduced low-carbon steel plate or strip which is tinplated on both sides through
continuous electrolytic tinning.
3.2
differentially coated electrolytic tinplate
Electrolytic tinplate of different tin coating weights on the two sides.
3.3
single cold-reduced; SR
Steel baseplate is cold-reduced to obtain the required thickness, and then annealed
and skin-passed.
3.4
double cold-reduced; DR
Reduction in which steel baseplate goes through first cold-reducing and annealing,
and then cold-reduced with large rolling reduction.
3.5
box annealing; BA
The process in which cold-reduced steel strip is annealed in the wind-up state and the
controlled atmosphere, in accordance with the set cycles of time and temperature.
3.6
continuous annealing; CA
The process in which cold-reduced steel strip is annealed in the unfolding state and
controlled atmosphere, in accordance with the set cycles of time and temperature.
4 Classification and Codes
4.1 The classification and codes of tinplate shall be as specified in Table 1.
4.2 Designation
4.2.1 For tinplate of general purposes, its designation consists of black plate steel
grade code, temper degree code and annealing method code.
EXAMPLE MR T-2.5 CA, L T-3 BA, MR DR-8 BA
4.2.3 For the tinplate used for manufacturing plain surface (coating weight more than
5.6/2.8 g/m2) food cans for acidic contents, i.e. K plate, the black plate steel grade is
usually steel grade L. Its designation consists of black plate steel grade L, temper
degree code, annealing method code and code K.
4.2.4 For tinplate used for manufacturing food cans for mushroom and others which
require low-chromium passivation treatment, the black plate steel grade is usually steel
grade MR or L.
5 Ordering Content
The contract or order placed in accordance with this Standard shall include the
following content.
6 Dimensions, Shapes, Weights and Tolerances
6.1 Dimensions
6.1.1 When the nominal thickness of tinplate is less than 0.50 mm, the increment of
0.01 mm is used for advancement.
6.1.2 If the marking of rolling width direction is required, the letter W may be added
behind the number showing rolling width.
EXAMPLE 0.26 × 832W × 760
6.1.3 The inner diameters of steel rolls are 406 mm, 420 mm, 450 mm or 508 mm.
6.2 Tolerances for dimensions
6.2.1 Tolerance for thickness
The tolerance for thickness of tinplate shall not be greater than ± 7% of nominal
thickness.
6.3 Shapes
6.3.1 Skewness
The skewness shall not be greater than 0.15% of the width of tinplate. The skewness
is the vertical projection length of the wide side of tinplate (width) to the longitudinal
side of tinplate (length), as shown in Figure 1.
6.4 Tolerances for edge shapes and dimensions and shapes of WL tinplate
The tolerances for edge shapes, dimensions and shapes of WL tinplate shall be as
agreed on by the supplier and the purchaser during ordering.
6.5 Others
Other dimensions, shapes, weights and tolerances shall be as specified in GB/T 708.
6.6 Welding lines in steel strips
6.6.1 In each roll of steel strips, the total number of welding lines on any 10 000 mm
length shall not be greater than 3.
7 Technical Requirements
7.1 Types and chemical compositions of black plate steels
7.1.1 The types and chemical compositions (ladle analysis) of black plate steel shall
be as specified in Table 2.
7.1.2 Other black plate steel grades and chemical compositions may be used as
agreed on by the supplier and the purchaser, which shall be stated in the contract.
7.2 Mechanical properties
7.2.1 The temper degree of tinplate is expressed by the value of Rockwell hardness
(HR30Tm).
7.2.2 The hardness (HR30Tm) of SR tinplate shall be as specified in Table 3.
Table 3
7.2.3 The hardness (HR30Tm) of DR tinplate shall be as specified in Table 4.
Table 4
7.3 Tin coating
7.3.1 The tin coating weight codes, nominal coating weights and minimum mean
coating weights of tinplate shall be as specified in Table 6.The tin coating weight codes
other than those in Table 6 may also be used as agreed on by the supplier and the
purchaser, but the minimum mean coating weight shall be as specified in Table 7.
Temper degree code Target value of specified plastic elongation strength (Rp0.2)a, b, c/MPa
7.3.3 When the minimum mean coating weight (of three points) and the minimum
coating weight (of a single point) is calculated in accordance with the percentage
relative to the nominal coating weight, the rounding interval is 0.05g/m2.
7.7 Surface quality
7.7.1 The surface of tin coating shall be free from the defects which harm its usability,
such as pinholes, scars, pits, wrinkles, rusts and so on, but the deficiencies which
cause no harm to its usability are allowed, such as slight inclusions, scratches,
indentations and oil marks and so on.
7.7.2 For steel strips, it is impossible to cut off the defective part of steel strips, so
steel strips are allowed to be delivered with defects, but the length of the defective part
shall not exceed 8% of the total length of each roll.
7.8 Raw material tin
The raw material tin used for the electrolytic tinning of tinplate shall be as specified in
the provisions for the designation Sn99.90 in GB/T 728-2010; and the mass fraction of
lead content shall not be greater than 0.010 0%.
8 Test Methods
8.1 The dimensions and shapes of tinplate shall be measured with appropriate tools.
8.2 The thickness measuring position is any point not less than 10 mm from both
sides of tinplate.
8.3 The appearance of tinplate is examined by visual inspection.
8.5 For the hardness test, usually 3 points are measured for one sample. When the
maximum difference (i.e. the maximum value – the minimum value) of the 3 points is
greater than 1.0, add 2 points for measurement, take out the maximum and minimum
values of the 5 points, calculate the mean value of the 3 points as the test value. In
case of any dispute in the test result, then remove the tin coating and conduct the test
once again.
8.6 When the nominal thickness of tinplate is smaller than 0.20 mm, use HR15Tm
for hardness measurement, and then convert into HR30Tm as specified in Annex C.
8.7 The inspection items, sample quantities, sampling methods or sampling locations
and test methods shall be as specified in Table 9.
9 Inspection Rules
9.1 Tinplate shall be inspected by batch; and each inspection batch consists of the
tinplate of not greater than 30 t, of the same designations, specifications, tin coating
weight codes and surface conditions.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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