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GB/T 13912-2020: Metallic coatings--Hot dip galvanized coatings on fabricated iron and steel articles--Specifications and test methods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 13912: Historical versions
Similar standardsGB/T 13912-2020: Metallic coatings--Hot dip galvanized coatings on fabricated iron and steel articles--Specifications and test methods---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/GBT13912-2020 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 ContentsForeword... 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... 25ForewordThis 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, Pan Wengan, Shen Hongwei, Yi Juan, Xia Jingzhong. The previous editions of the standard replaced by this Standard were released as follows. - GB/T 13912-1992, GB/T 13912-2002. Metallic coatings - Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test methods1 ScopeThis 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.2 Normative referencesThe 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)3 Terms and definitionsFor the purposes of this document, the terms and definitions given in GB/T 12334 and the following apply. Total thickness of coating of zinc and/or zinc iron alloys on iron and steel surface, expressed in μm. Mean value of coating thickness obtained from the specific number of measurements within a reference area for a magnetic test OR thickness conversion value of the coating mass measured by a gravimetric test for one measurement.4 General requirementsThe hot dip galvanizing bath shall primarily contain molten zinc. The total of the other elements (as identified in GB/T 470, EN 1179 or EN 13283) in the molten zinc shall not exceed 1.5 % by mass.5 Acceptance and samplingAcceptance inspection can be undertaken before the products leave the hot dip galvanizers custody, unless otherwise specified at the time of ordering by the purchaser.6 Coating requirementsIn case of dispute regarding the test method, the method of calculating the coating thickness shall be by the determination of the mean mass of hot dip galvanized coating per unit area using the gravimetric method in accordance with GB/T 13825, and the nominal density of the coating, 7.2 g/cm3, shall be used for calculation purposes. Where less than 10 articles are involved, the purchaser shall not have to accept the gravimetric test if that would involve the destruction of articles and unacceptable remedial costs to the purchaser.7 Certificate of complianceWhen required, the hot dip galvanizer shall provide a certificate of compliance with the requirements of this Standard (see GB/T 18253).Annex A(Normative) Information to be supplied A.1 Essential information for provision by the purchaser to the galvanizer The number of this Standard, i.e. GB/T 13912, shall be supplied by the purchaser to the galvanizer. A.2 Additional information for provision by the purchaser to the galvanizer ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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