GB/T 13912-2020_English: PDF (GB/T13912-2020)
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Metallic coatings--Hot dip galvanized coatings on fabricated iron and steel articles--Specifications and test methods
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Metallic coatings -- Hot dip galvanized coatings on fabricated iron and steel articles -- Specifications and test methods
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| GB/T 13912-1992 | English | 319 |
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Metallic coatings--Hot dip galvanized coatings on fabricated iron and steel articles--Specifications
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| Standard ID | GB/T 13912-2020 (GB/T13912-2020) | | Description (Translated English) | Metallic coatings--Hot dip galvanized coatings on fabricated iron and steel articles--Specifications and test methods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.40 | | Word Count Estimation | 18,148 | | Date of Issue | 2020-06-02 | | Date of Implementation | 2021-04-01 | | Drafting Organization | Wuhan Institute of Materials Protection Co., Ltd., Maanshan Shuntai Rare Earth New Materials Co., Ltd., Jiangsu Guoqiang Galvanizing Industry Co., Ltd., Shanghai Yongfeng Hot-Dip Galvanizing Co., Ltd., South China University of Technology, Jiangsu Shengda Cosco Electric Co., Ltd., Tongxiang City Iron and Steel Co., Ltd. Sheng Line Equipment Co., Ltd. | | Administrative Organization | National Technical Committee for Standardization of Metallic and Non-metallic Coatings (SAC/TC 57) | | Proposing organization | China Machinery Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 13912-2002 (GB/T13912-2002) | | Description (Translated English) | Metallic coatings - Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test methods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.40 | | Word Count Estimation | 18,189 | | Date of Issue | 2002-04-10 | | Date of Implementation | 2002-12-01 | | Older Standard (superseded by this standard) | GB/T 13912-1992 | | Quoted Standard | GB/T 470; GB/T 4955; GB/T 4956; GB/T 6462; GB/T 9793; GB/T 12334; GB/T 13825; GB/T 18253; ISO 2859-1; ISO 2859-3 | | Adopted Standard | ISO 1461-1999, MOD | | Drafting Organization | Wuhan Institute of Materials Protection | | Administrative Organization | National Metal and nonmetal coatings Standardization Technical Committee | | Proposing organization | China Machinery Industry Federation | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China | | Summary | This standard specifies the iron parts hot dip galvanized coatings (other alloying elements content does not exceed 2% of the total) of the technical requirements and test methods. This standard does not apply to the following situations: a) continuous hot dip galvanizing production sheet, strip, wire, tubes and rods, b) using a special standard hot dip galvanized products, c) there are additional requirements or with the standard requirements are inconsistent hot dip galvanized products. | | Standard ID | GB/T 13912-1992 (GB/T13912-1992) | | Description (Translated English) | Metallic coatings--Hot dip galvanized coatings on fabricated iron and steel articles--Specifications | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.40 | | Word Count Estimation | 8,832 | | Date of Issue | 1992/12/1 | | Date of Implementation | 1993/10/1 | | Adopted Standard | ISO 1459-73 (E) ISO 1461-73 (E), NEQ |
GB/T 13912-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.40
A 29
Replacing GB/T 13912-2002
Metallic coatings - Hot dip galvanized coatings on
fabricated iron and steel articles - Specifications and
test methods
(ISO 1461:2009, Hot dip galvanized coatings on fabricated iron and
steel articles - Specifications and test methods, MOD)
ISSUED ON: JUNE 02, 2020
IMPLEMENTED ON: APRIL 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 7
4 General requirements ... 10
4.1 General ... 10
4.2 Hot dip galvanizing bath ... 10
4.3 Information to be supplied by the purchaser ... 10
4.4 Safety ... 11
5 Acceptance and sampling ... 11
6 Coating requirements ... 11
6.1 Appearance ... 11
6.2 Thickness ... 12
6.3 Renovation ... 16
6.4 Adhesion ... 17
6.5 Acceptance criteria ... 17
7 Certificate of compliance ... 18
Annex A (Normative) Information to be supplied ... 19
Annex B (Normative) Safety requirements ... 21
Annex C (Informative) Corrosion resistance of hot dip galvanized coatings .. 22
Annex D (Informative) Determination of thickness ... 23
Annex E (Informative) Renovation of uncoated or damaged areas... 24
Bibliography ... 25
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 13912-2002 "Metallic coatings - Hot dip
galvanized coatings on fabricated iron and steel articles - Specifications and
test methods". Compared with GB/T 13912-2002, the main technical changes
of this Standard are as follows:
- ADD the terms 3.16 “Zinc melt” and 3.17 “Weld seepage”.
- 4.1 “General” incorporates the previous 4.2 “Base metal”; adjust the
previous 4.1 “Information to be provided by the purchaser” into Annex A.
- Adjust the previous 6.3 “Uncoating and renovation” into Annex E and make
supplements.
- Delete the previous Clause 7 “Test methods”. Incorporate the previous 7.1
“Appearance test” and 7.3 “Adhesion test” with the corresponding
provisions in Clause 6. Adjust the previous 7.2 “Thickness measurement
part” into Annex D.
This Standard uses the redraft law to modify and adopt ISO 1461:2009 "Hot dip
galvanized coatings on fabricated iron and steel articles - Specifications and
test methods".
Compared with ISO 1461:2009, this Standard has been adjusted in terms of
structure. Annex E and Annex C of ISO 1461:2009 have been adjusted to Annex
C and Annex E of this Standard, respectively.
The technical differences between this Standard and ISO 1461:2009 and their
reasons are as follows:
- As for the normative references, this Standard has made adjustments with
technical differences, to adapt to the technical conditions of China. The
adjustments are mainly reflected in Clause 2 “Normative references”. The
specific adjustments are as follows:
Replace ISO 752 with GB/T 470 which modifies and adopts the
international standard (see 4.2);
Replace ISO 2859-1 with GB/T 2828.1 which is identical to the
international standard (see 6.2.3);
Replace ISO 2859-2 with GB/T 2828.2 which is non-equivalent to the
international standard (see 6.2.3);
Replace ISO 2859-3 with GB/T 2828.3 which is identical to the
international standard (see 6.2.3);
Replace ISO 2178 with GB/T 4956 which is identical to the international
standard (see 6.2.2);
Replace ISO 3882 with GB/T 6463 which is identical to the international
standard (see 6.2.2);
Replace ISO 2064 with GB/T 12334 which is identical to the
international standard (see Clause 3);
Replace ISO 2808 with GB/T 13452.2 which is identical to the
international standard (see 6.2.2);
Replace ISO 1460 with GB/T 13825 which is identical to the
international standard (see 6.2.2);
Replace ISO 10474 with GB/T 18253 which is identical to the
international standard (see Clause 7).
This Standard has made the following editorial changes:
- CHANGE the standard name to "Metallic coatings - Hot dip galvanized
coatings on fabricated iron and steel articles - Specifications and test
methods";
- According to GB/T 1.1-2009, appropriately supplement and adjust the
content of Clause 1 "Scope";
- According to the order mentioned in the standard text, adjust the numbers
of Annex C and Annex E.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
57 on Metallic and Non-metallic Coating of Standardization Administration of
China (SAC/TC 57).
Drafting organizations of this Standard: Wuhan Research Institute of Materials
Protection, Maanshan Shuntai Rare Earth & New Materials Co., Ltd., Jiangsu
Guoqiang Galvanization Industrial Co., Ltd., Shanghai Yongfeng Hot-dip
Galvanizing Co., Ltd., South China University of Technology, Jiangsu Shengda
Zhongyuan Electric Co., Ltd., Tongxiang Tiesheng Line Equipment Co., Ltd.
Main drafters of this Standard: Wu Yong, Kong Gang, Yuan Chong, Yuan
Guoqiang, Liu Jilu, Shi Zhimin, Zhu Xiaochun, Ran Chengjin, Xu Zhongtang,
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 for hot dip
galvanized coatings on fabricated iron and steel articles. This Standard does
not specify the after-treatment and protective coating of hot dip galvanized
products.
This Standard applies to hot dip galvanized coatings of fabricated iron and steel
articles (including certain castings) (the total content of other alloying elements
does not exceed 2 %). This Standard does not apply to the following:
a) sheet, wire and woven or welded mesh products that are continuously hot
dip galvanized;
b) tube and bar that are hot dip galvanized in automatic plants;
c) hot dip galvanized products (e.g. fasteners) for which specific standards
exist and which might include additional requirements or requirements
which are different from those of this Standard.
Note: Individual product standards can incorporate this Standard for the coating by quoting
its number, or can incorporate it with modifications specific to the product. Different
requirements can also be made for galvanized coatings on products intended to
meet specific regulatory requirements.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 470 Zinc ingots (GB/T 470-2008, ISO 752:2004, MOD)
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection (GB/T 2828.1-2012, ISO 2859-1:1999, IDT)
GB/T 2828.2 Sampling procedures for inspection by attributes - Part 2:
Sampling plans indexed by limiting quality (LQ) for isolated lot inspection
(GB/T 2828.2-2008, ISO 2859-2:1985, NEQ)
GB/T 2828.3 Sampling procedures for inspection by attributes - Part 3: Skip-
lot sampling procedures (GB/T 2828.3-2008, ISO 2859-3:2005, IDT)
GB/T 4956 Non-magnetic coatings on magnetic substrates - Measurement
of coating thickness - Magnetic method (GB/T 4956-2003, ISO 2178:1982,
IDT)
GB/T 6463 Metallic and other inorganic coatings - Review of methods of
measurement of thickness (GB/T 6463-2005, ISO 3882:2003, IDT)
GB/T 12334 Metallic and other inorganic coatings - Definitions and
conventions concerning the measurement of thickness (GB/T 12334-2001,
idt ISO 2064:1996)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T
13452.2-2008, ISO 2808:2007, IDT)
GB/T 13825 Metallic coatings - Hot dip galvanized coatings on ferrous
materials - Gravimetric determination of the mass per unit area (GB/T 13825-
2008, ISO 1460:1992, IDT)
GB/T 18253 Steel and steel products - Types of inspection documents (GB/T
18253-2018, ISO 10474:2013, IDT)
ISO 3549 Zinc dust pigments for paints - Specifications and test methods
EN 1179 Zinc and zinc alloys - Primary zinc
EN 13283 Zinc and zinc alloys - Secondary zinc
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T
12334 and the following apply.
3.1
Hot dip galvanizing
Formation of a coating of zinc and/or zinc iron alloys on iron and steel products
......
GB/T 13912-2002
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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 µm.
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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