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GB/T 13912-2002 English PDF (GBT13912-2002)

GB/T 13912-2002 English PDF (GBT13912-2002)

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GB/T 13912-2002: Metallic coatings -- Hot dip galvanized coatings on fabricated iron and steel articles -- Specifications and test methods

This Standard specifies the specifications and test methods of the hot dip galvanized coatings (the total content of other alloying elements shall not be more than 20) on the fabricated iron and steel articles.
GB/T 13912-2002
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.220.40
A 29
Replacing GB/T 13912-1992
Metallic Coatings - Hot Dip Galvanized Coatings
on Fabricated Iron and Steel Articles -
Specifications and Test Methods
(ISO 1461.1999, Hot dip galvanized coatings on fabricated
iron and steel articles - Specifications and test methods, MOD)
ISSUED ON. APRIL 10, 2002
IMPLEMENTED ON. DECEMBER 1, 2002
Issued by. General Administration of Quality Supervision, Inspection and Quarantine 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. General Requirements ... 8
5 Samples... 9
6 Coating Requirements ... 10
7 Test Methods ... 13
8 Qualification Certificates ... 16
Appendix A ... 17
Appendix B ... 18
Appendix C... 19
Appendix D... 24
Appendix E ... 25
References ... 27
Foreword
This Standard modifies and adopts ISO 1461.1999 "Hot Dip Galvanized Coatings on Fabricated Iron and Steel Articles - Specifications and Test Methods".
This Standard is redrafted according to ISO 1461.1999. The differences between this Standard and ISO 1461 are listed in Appendix A.
The following modifications are made in this Standard; the technical differences between this Standard and ISO 1461 as well as the reasons are listed in Appendix B. ?€? The standard name is changed to "Metallic Coatings - Hot Dip Galvanized Coatings on Fabricated Iron and Steel Articles - Specifications and Test Methods" according to the existing domestic series standards;
?€? Delete the foreword of ISO 1461;
?€? Use "this Standard" to replace "this International Standard";
?€? Quote the Chinese standards that partially adopt international standards; ?€? Combine the contents of Section 4.2 and Appendix A of ISO 1461.1999 into Section 4.1 of this Standard;
?€? Divide the contents of chapter 6 of ISO 1461.1999 into Chapter 6 and Chapter 7 of this Standard;
?€? Requirements are put forward to the coating thickness of the hot dip galvanized articles which adopt the zinc explosion to replace the centrifuging treatment or adopt both of them at the same time;
?€? Safety requirements are put forward to the hot dip galvanizing for incompletely dried articles.
This Standard replaces GB/T 13912-1992 "Metallic Coatings - Hot Dip Galvanized Coatings on Fabricated Iron and Steel Articles - Specifications".
The main changes of this Standard, compared with GB/T 13912-1992, are as follows. ?€? If the coating thickness is larger than the specified value, then the galvanized article surface is allowed to have dark or grayish color-unevenness;
?€? Safety requirements are put forward to the hot dip galvanizing production process;
?€? The area of each uncoated surface is required not to exceed 10cm2;
Metallic Coatings - Hot Dip Galvanized Coatings on Fabricated
Iron and Steel Articles - Specifications and Test Methods
1 Scope
This Standard specifies the specifications and test methods of the hot dip galvanized coatings (the total content of other alloying elements shall not be more than 20) on the fabricated iron and steel articles.
This Standard is not applicable to the following conditions.
a) Plates, strips, wire rods, pipes and rods that are produced by continuous hot dipping;
b) Hot dip galvanized products that adopt particular standards;
c) Hot dip galvanized products which have additional requirements or are inconsistent with the requirements of this Standard.
Note. Some product standards may specify the product hot dip galvanized coatings through reference in this Standard or amendment of partial articles in this Standard. This Standard does not specify the after-treatment and additional over-coating for the hot dip galvanized products.
2 Normative??References
The following provisions, through reference in this text, constitute the provisions of this Standard. For the dated reference, all the subsequent amendments (not including the corrigendum contents) or revisions of these publications do not apply. However, parties who enter into an agreement based on this Standard are encouraged to study whether the latest revisions of these documents apply. For undated reference, the latest revisions apply to this Standard.
GB/T 470 Zinc ingots (eqv ISO 752)
GB/T 4955 Metallic coatings - Measurement of coating thickness - Coulometric method by anodic dissolution (eqv ISO 2177)
GB/T 4956 Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method (eqv ISO 2178)
GB/T 6462 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method (eqv ISO 1463)
GB/T 9793 Metallic and other inorganic coatings - Thermal spraying - Zinc, aluminum and their alloys (eqv ISO 2063)
GB/T 12334 Metallic and other inorganic coatings - Definitions and conventions concerning the measurement of thickness (eqv ISO 2064)
GB/T 13825 Metallic coatings - Determination of the mass for hot dip galvanized coatings on ferrous materials - Gravimetric method (eqv ISO 1460)
GB/T 18253 Steel and steel products - Types of inspection data (eqv ISO 10747) ISO 2859-1 Sampling procedure for characteristic inspection - Part 1. Lot inspection sampling plan according to the determined acceptable quality level (AQL)
ISO 2859-3 Sampling procedure of characteristic inspection - Part 3. Sampling procedure of discontinuous lots
3 Terms??and??Definitions
The following terms and definitions as well as the ones specified in GB /T 12334 apply to this Standard.
3.1 Hot Dip Galvanizing
It is a kind of process and method that zinc and (or) zinc-ferrum alloy coating is formed on the surfaces of the pretreated steel or cast iron articles by immerging them into the molten zinc bath.
3.2 Hot Dip Galvanized Coating
It refers to the zinc and (or) zinc-ferrum alloy coating that is obtained on the surfaces of the iron and steel articles by adopting the hot dip galvanizing method. Note. It is abbreviated as coating in this Standard.
3.3 Coating Mass
It is the total mass of the zinc and (or) zinc-ferrum alloy coating on per unit area of the steel surface, in g/m2.
3.4 Coating Thickness
It is the total thickness of the zinc and (or) zinc-ferrum alloy coating on the steel surface, in ??m.
3.5 Significant Surface
It is part of the article surface which is hot dip galvanized or will be hot dip galvanized. The coating on such surface is of great importance for the appearance and (or) service performance of the article.
3.6 Control Sample
It is the hot dip galvanized article or article group that are used for tests in a random selection from the inspection lot.
3.7 Reference Area
It is the area that is subjected to test and experiment according to the specified times. 3.8 Local Coating Thickness
It is the arithmetic mean value of the coating thickness, measured by the magnetic method as designed; or the equivalent value of the coating mass thickness, measured by primary measurement on a certain reference area.
3.9 Mean Coating Thickness
It is the arithmetic mean value of the local coating thickness of a certain large article or a sample from a certain galvanized article lot.
Note. The large article in this Standard refers to the article of which the significant surface area is larger than 2m2 (see 6.2.9.2).
3.10 Local Coating Mass
It is the coating mass of a certain area through primary measurement by the gravimetric method.
3.11 Mean Coating Mass
It is the arithmetic mean value of the local coating mass or the equivalent value of the mean coating thickness, measured by the gravimetric method according to the sampling specified in Chapter 5.
3.12 Minimum Value
It is the minimum value of the equivalent value of the coating mass thickness, measured by the gravimetric method; or the minimum value of the arithmetic mean value of the coating thickness, measured by the magnetic method as designed on a certain reference area.
3.13 Inspection Lot
It is referred to as "lot" and is the hot dip galvanized articles in an order or in a delivery.
3.14 Acceptance Inspection
It is the inspection which shall be made for the hot dip galvanized articles of a certain inspection lot in the manufacturing f...

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