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GB/T 2520-2008 English PDF (GBT2520-2008)

GB/T 2520-2008 English PDF (GBT2520-2008)

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GB/T 2520-2008: Cold-reduced electrolytic tinplate

This standard specifies the classification and code, size, shape, weight, technical requirements, inspection and test, packaging, marking and quality certificates of cold-reduced electrolytic tinplate.
GB/T 2520-2008
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 77.140.75
H 46
Replacing GB/T 2520-2000
Cold-reduced electrolytic tinplate
ISSUED ON. SEPTEMBER 11, 2008
IMPLEMENTED ON. MAY 01, 2009
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 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Classification and code ... 8
5 Ordering information required ... 9
6 Size, shape, weight and allowable deviation ... 10
7 Technical requirements ... 12
8 Inspection and test ... 17
9 Packaging, marking and quality certificate ... 19
10 Numerical rounding off rules ... 19
11 Approximate comparison of domestic and foreign related standard
tempering degree codes ... 19
Appendix A (Normative) Thick side identification method of differentially coated tinplate ... 20
Appendix B (Informative) Rebound test method of double cold-reduced plate ... 21
Appendix C (Normative) HR15T and HR30Tm conversion table ... 23
Appendix D (Informative) Comparison between the tempering degree code (or steel grade code) of this standard and that of relevant standard ... 24 Foreword
This standard is the revision of GB/T 2520-2000 ?€?Cold-reduced electrolytic tinplate?€? with reference to JIS G3303.2008 ?€?Tinplate and blackplate?€? (Japanese version), ASTM A623M-06a ?€?Standard specification for tin mill products, General requirements?€? (English version), ASTM A624M-03 ?€?Standard
specification for tin mill products, electrolytic tin plate, single reduced?€? (English version), ASTM A625M-03 ?€?Standard specification for tin mill products, black plate, single reduced?€? (English version), ASTM A626M-03 ?€?Standard
specification for tin mill products, electrolytic tin plate, double reduced?€? (English version), ASTM A650M-03 ?€?Standard specification for tin mill products, black plate, double reduced?€? (English version), ISO 11949.1995 ?€?Cold reduced
electrolytic tinplate?€? (English version), and EN10202.2001 ?€?Cold reduced tinmill products - Electrolytic tinplate and electrolytic chromium/chromium oxide coated steel?€? (English version).
This standard replaces GB/T 2520-2000.
As compared with GB/T 2520-2000, the main changes of this standard are as follows.
- CHANGE the standard Chinese name;
- MODIFY the contents of terms and definitions;
- MODIFY the tinplating amount code expression method;
- ADD the code of straight side plate and lace plate;
- USE the tempering degree to replace the original steel level expression; - CANCEL the requirements for the level I and level I from surface quality; - ADD the designation expression example;
- ADD the information required for ordering;
- MODIFY the requirements for size and allowable dimensional deviation; - MODIFY the deviation range and rounding off requirements of the
minimum mean tinplating amount;
- MODIFY the identification method of differentially coated electrolytic tinplate;
Cold-reduced electrolytic tinplate
1 Scope
This standard specifies the classification and code, size, shape, weight, technical requirements, inspection and test, packaging, marking and quality certificates of cold-reduced electrolytic tinplate.
This standard applies to the single cold-reduced electrolytic tinplate with a nominal thickness of 0.15 mm ~ 0.60 mm AND the double cold-reduced
electrolytic tinplate with a nominal thickness of 0.12 mm ~ 0.36 mm
(hereinafter referred to as steel plate and steel strip).
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 228 Metallic materials - Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 230.1 Metallic Rockwell hardness test - Part 1. Test methods (scales A, B, C, D, E, F, G, H, K, N, T) (GB/T 230.1-2004, ISO 65081.1999, MOD)
GB/T 247 General rule of package mark and certification for steel plates (sheets) and strips
GB/T 708 Dimension, shape, weight, and tolerance for cold-rolled steel
plate
GB/T 728-1998 Ingot tin
GB/T 1838 Test methods of tin coating mass for electrolytic tinplate
GB/T 8170 Rules for rounding off for numerical values and expression and
judgment of limiting values
Continuous annealing (CA)
It refers to the annealing process of the cold reduced steel strip in unfolding state in the controlled atmosphere at a set time and temperature cycle. 3.7
Chemical treated electrolytic tinplate
It refers to the corresponding chemical passivation treatment conducted on the surface of the electrolytic tinplate to make the surface characteristics of the electrolytic tinplate comply with the final intended use as specified. 3.8
Chemical chromate treated
It refers to the chemical passivation treatment of the electrolytic tinplate which is immersed in the dichromate solution without being energized.
3.9
Electrolytic chromate treated
It refers to the cathodic electrochemical passivation treatment of the
electrolytic tinplate which is immersed in the dichromate solution being energized.
3.10
Low chromate treated
It refers to one of the chemical passivation treatments, wherein the target value of the chromium content in the surface passivation film shall be
controlled below 1.5 mg/m2.
3.11
K plate
As for some of food with strong electrochemical detinning effect, it shall use the tinplate of good corrosion resistance, with the tinplating amount not less than 5.6/2.8 g/m2; AND after being subjected to the four special tests
including acid lag (PL), iron solution value (ISV), tin crystal size (TCS), and alloy-tin electric coupling (ATC), the target value shall comply with the following requirements.
the actual thickness as measured at the middle position along the width direction of the steel plate and steel strip shall be not more than 8.0% of the actual thickness as measured at the middle position.
6.2.3 Allowable width deviation
The allowable width deviation of steel plate and strip is 0 mm ~ +3 mm. 6.2.4 Allowable length deviation
The allowable length deviation of the steel plate is 0 mm ~ + 3 mm.
6.3 Shape
6.3.1 The degree of disengagement shall not be greater than 0.15% of the width of the steel plate.
6.3.2 For every 1000 mm length, the camber shall not be more than 1 mm. 6.3.3 Roughness is only applicable to steel plates. The roughness along any 1000 mm length of the steel plate shall not be more than 3 mm.
6.4 The edge shape and size as well as the allowable dimensional deviation of the lace side plate shall be as negotiated between the supplier and the purchaser at the time of ordering.
6.5 Other size, shape, weight and allowable deviation shall comply with the provisions of GB/T 708.
6.6 Welds in steel strip
6.6.1 In each steel strip, the total number of welds at any length of 10000 m shall not be greater than 3.
6.6.2 Welds in steel strip shall be marked through punching plus visible mark, for example, by inserting a soft label at the weld location. Through negotiation between the supplier and the purchaser, it may also use other marking
method.
6.6.3 The thickness of the weld shall not be greater than 1.5 times the nominal thickness of the strip.
6.6.4 The total length of the weld lap (a) shall not be more than 10 mm AND the free lap length (b) shall not be greater than 5 mm, as shown in Figure 1. Appendix B
(Informative)
Rebound test method of double cold-reduced plate
B.1 Principles
First MEASURE the thickness of the rectangular test; and then BEND around the cylindrical mandrel for 180??; RELEASE it and MEASURE the rebound
angle, which provides a simple and convenient method for the assessment of the yield strength of the double cold-reduced plate.
B.2 Samples
From each sample steel plate of the double cold-reduced tinplate, TAKE two 200 mm ?? 25 mm samples from the edge and middle part, with the distance from the edge sample to the steel plate edge of not less than 25 mm. Before the test, MAKE the sample subjected to artificial aging for 20 min at 200 ??C. B.3 Test
B.3.1 Test instrument
Rebound tester.
B.3.2 Test procedure
B 3.2.1 MEASURE the thickness of the sample, accurate to 0.001 mm...

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