標準編號:	GB/T 2518-2019
中文名稱:	連續熱鍍鋅和鋅合金鍍層鋼板及鋼帶
英文名稱:	Continuously hot-dip zinc and zinc alloy coated steel sheet and strip
中標分類:	H46    鋼板、鋼帶
行業分類:	GB    國家標準
ICS分類:	77.140.50 77.140.50    扁平鋼和半成品 77.140.50
發布機構:	中華人民共和國國家市場監督管理總局 中國國家標準化管理委員會
發布日期:	2019-12-10
實施日期:	2020-7-1
標準狀態:	valid
替代舊標準:	GB/T 2518-2008 連續熱鍍鋅鋼板及鋼帶 GB/T 14978-2008 連續熱鍍鋁鋅合金鍍層鋼板及鋼帶
翻譯語言:	英文
文件格式:	PDF
中文字符數:	30000 字
翻譯價格(元):	1300.0
交付時間:	付款后 1 個工作日

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 2518-2008 Continuously hot-dip zinc-coated steel sheet and strip and GB/T 14978-2008 Continuously hot-dip aluminum-zinc alloy coated steel sheet and strip. GB/T 2518-2008 and GB/T 14978-2008 are integrated in this standard. The following main technical changes have been made with respect to GB/T 2518-2008: ——The term and definition of coating mass have been added (see 3.14); ——The types and corresponding designations of hot-dip zinc-aluminum alloy coating and hot-dip aluminum-zinc alloy coating have been added (see 4.1.5 and Table 1); ——The designations of some dual phase steels, complex phase steels and dual phase steels with high formability have been added, and provisions on chemical component and mechanical property have been added in corresponding parts (see Table 1; Table 1 of GB/T 2518-2008); ——The default dimension and flatness precision grade when ordering have been added (see 5.2); ——The requirement that the tolerance of dimension and shape of steel sheets and strips comply with GB/T 25052-2010 is added (see 6.2); ——The requirements on yield strength and tensile strength have been modified (see Tables 5~13; Tables 5~12 of GB/T 2518-2008); ——The original chromium-free passivation has been divided into trivalent chromium passivation and chromium-free passivation (see 7.9; 7.9 of GB/T 2518-2008); ——The provisions on surface roughness and special requirements have been added (see 7.10.4); ——The requirements on position for thickness measurement have been deleted (see 8.3 of GB/T 2518-2008); ——The sampling position requirements for tensile test have been deleted (see 8.4 of GB/T 2518-2008); ——Annex A has been deleted (see Annex A of GB/T 2518-2008). The following main technical changes have been made with respect to GB/T 14978-2008: ——The types and corresponding designations of hot-dip zinc coating, hot-dip zinc-iron alloy coating and hot-dip zinc-aluminum alloy coating have been added (see 4.1.5 and Table 1; 4.1.5 and Table 1 of GB/T 14978-2008); ——The designations of some high strength interstitial free steel, bake hardening steel and low alloy steel have been added, and provisions on chemical component and mechanical property have been added in corresponding parts (see Table 1 and Tables 7~9; Table 1 of GB/T 14978-2008); ——The requirements on yield strength and tensile strength have been modified (see Tables 5~6; Tables 5~6 of GB/T 14978-2008); ——The default dimension and flatness precision grade when ordering have been added (see 5.2); ——The requirement that the tolerance of dimension and shape of steel sheets and strips comply with GB/T 25052-2010 is added (see 6.2); ——The original chromium-free passivation has been divided into trivalent chromium passivation and chromium-free passivation (see 7.9; 7.9 of GB/T 14978-2008); ——The provisions on surface roughness and special requirements have been added (see 7.10.4); ——The requirements on position for thickness measurement have been deleted (see 8.3 of GB/T 14978-2008); ——Annex A has been deleted (see Annex A of GB/T 14978-2008). This standard was proposed by the China Iron and Steel Association. This standard is under the jurisdiction SAC/TC 183 the National Technical Committee on Iron and Steel of Standardization Administration of China. The previous editions of this standard are as follows: ——GB/T 2518-1981, GB/T 2518-1988, GB/T 2518-2004 and GB/T 2518-2008. ——GB/T 14978-1994 and GB/T 14978-2008. Continuously hot-dip zinc and zinc alloy coated steel sheet and strip 1 Scope This standard specifies the terms and definitions; classification, code and expression method for designation; order contents; dimension, shape and weight; technical requirements; test methods; inspection rules; packaging, marking, and quality certificate in connection with continuously hot-dip zinc, zinc-iron alloy, zinc-aluminum alloy and aluminum-zinc alloy coated steel sheet and strip. This standard is applicable to steel sheets and strips with a thickness of 0.20 mm ~ 6.0 mm used in automobile, construction, household appliances and other industries. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 - Chrome azurol S photometric method GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The n-benzoyl-n-phenylhydroxylamine extraction photometric method for the determination of vanadium GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content GB/T 223.26 Iron steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content GB/T 223.64 Iron steel and alloyed - Determination of manganese content - Flame atomic absorption spectrometric method GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - Curcumin spectrophotometric method for the determination of boron content GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 247 General rule of package, mark and certification for steel plates (sheets) and strips GB/T 1839-2008 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio (r-values) GB/T 5028 Metallic Materials - Sheet and Strip - Determination of tensile strain hardening exponent (n-values) GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values GB/T 17505 Steel and steel products - General technical delivery requirements GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 20126 Unalloyed steel - Determination of low carbon content - Part 2: Infrared absorption method after combustion in an induction furnace (with preheating) GB/T 24174 Steel - Determination of Bake-Hardening-Index (BH2) GB/T 25052-2010 Continuously hot-dip coated steel sheet and strip - Tolerances on dimensions shape and weight ISO 6892-1:2016 Metallic materials - Tensile testing - Part 1: Method of test at room temperature ? 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 hot-dip zinc coating zinc coating applied by immersing the pretreated steel strip in the molten zinc on a continuous hot-dip galvanizing line Note: the molten zinc shall have a zinc content of at least 99% 3.2 hot-dip zinc-iron alloy coating zinc-iron alloy coating applied by immersing the pretreated steel strip in the molten zinc on a continuous hot-dip galvanizing line Note: the molten zinc shall have a zinc content of at least 99% A zinc-iron alloy coating is formed over the entire coating by alloying process, and the alloy coating usually has an iron content of 8% to 15%. 3.3 hot-dip zinc-aluminum alloy coating coating applied by immersing the pretreated steel strip in the molten zinc-aluminum alloy on a continuous hot-dip zinc-aluminum alloy plating line Note: the molten zinc-aluminum alloy contains a small amount of rare earth, about 5% of aluminum (by mass fraction), and zinc for the rest part. 3.4 hot-dip aluminum-zinc alloy coating coating applied by immersing the pretreated steel strip in the molten aluminum-zinc alloy on a continuous hot-dip aluminum-zinc alloy plating line Note: in the molten aluminum-zinc alloy, the mass fraction of aluminum is about 55%, the mass fraction of silicon is about 1.6%, and the rest is zinc. ? 3.5 interstitial free steel steel produced by adding an appropriate amount of titanium or niobium to the ultra-low carbon steel so that the interstitial carbon and nitrogen atoms in the steel are completely fixed into carbide and nitride and no interstitial atoms exist in it 3.6 high strength interstitial free steel interstitial free steel with high strength and good forming properties, which is produced by adding a certain amount of strengthening elements such as phosphorus, manganese and silicon 3.7 bake hardening steel steel that retains a certain amount of solid solute carbon and nitrogen atoms, which can be strengthened by adding phosphorus, manganese and other strengthening elements, and further improved in terms of yield strength as a result of age-hardening after being processed and baked at a certain temperature 3.8 low alloy steel steel produced by adding microalloy elements such as niobium, titanium and vanadium in a single or composite manner to low carbon steel to form carbon nitrides for precipitation strengthening, and at the same time, by grain refinement effect of microalloy elements for strength enhancement 3.9 dual phase steel steel with the microstructure mainly composed of ferrite and martensite, and sometimes, certain bainite structure Note: dual phase steels not only have a high tensile strength, but also have a low yield ratio and a high work hardening rate. 3.10 transformation induced plasticity steel steel whose microstructure is composed of ferrite, bainite and residual austenite, and of which the residual austenite can be transformed into martensitic structure during forming Note: it has a high work hardening rate, percentage uniform elongation and tensile strength. It has a higher elongation compared with dual phase steel of equal tensile strength. 3.11 complex phase steel steel strengthened by refinement strengthening or precipitation strengthening of microalloy elements, with its microstructure composed of ferrite or bainite as the matrix on which a small amount of martensite, residual austenite or pearlite is distributed Note: it has higher yield strength and better bending properties compared with dual phase steel of equal tensile strength. 3.12 dual phase steel with high formability steel whose microstructure is mainly composed of ferrite, martensite and a small amount of bainite or residual austenite Note: compared with dual phase steel of equal tensile strength, it has higher percentage elongation after fracture and work hardening exponent. It is suitable for forming parts with higher drawing requirements. 3.13 stretcher strain marks defects such as slip lines and orange peels on the surface of the steel plate or strip due to aging during cold forming, which are detrimental to surface appearance ? 3.14 coating mass total mass of the coating on both sides Note: it is expressed in g/m2. 4 Expression method of designation, classification and code 4.1 Expression method of designation 4.1.1 General The designation of steel sheet and strip consists of five parts: product use code, steel grade code (or serial number), steel characteristics (if any), hot dip code (D) and coating type code, in which, hot dip code (D) and coating type code are connected by "+". 4.1.2 Use code Use codes are as follows: a) DX: The first letter D represents flat steel for cold forming; if the second letter is X, it indicates that the as-rolled state of the substrate is not specified; if the second letter is C, it indicates that the substrate is a cold-rolled substrate; if the second letter is D, it indicates that the substrate is a hot-rolled substrate. b) S: It represents structural steel. c) HX: The first letter H represents high-strength flat steel for cold forming; if the second letter is X, it indicates that the as-rolled state of the substrate is not specified; if the second letter is C, it indicates that the substrate is a cold-rolled substrate; if the second letter is D, it indicates that the substrate is a hot-rolled substrate. 4.1.3 Steel grade code (or serial number) Steel grade codes are as follows: a) 51 ~ 57: 2 digits, which represent steel grade serial number; b) 180 ~ 1,180: 3 ~ 4 digits, which represent the steel grade code; as per different naming method of designation, it is generally the specified minimum yield strength or minimum yield strength and minimum tensile strength, expressed in MPa. 4.1.4 Steel characteristics The steel characteristics are usually expressed by 1-2 letters, with the characteristic codes as follows: a) Y represents high strength interstitial free steel; b) LA represents low alloy steel; c) B represents bake hardening steel; d) DP represents dual phase steel; e) TR represents transformation induced plasticity steel; f) CP represents complex phase steel; g) DH represents dual phase steel with high formability; h) G indicates that the steel characteristics are not specified.

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Expression method of designation, classification and code 5 Order contents 6 Dimensions, shape and weight 7 Technical requirements 8 Test methods 9 Inspection rules 10 Packaging, marking and quality certificate Annex A (informative) Comparison between similar designations in this standard and relevant standard at home and abroad Annex B (Informative) Introduction and selection guide of coating types Annex C (Normative) Mass calculation method for theoretical weighing Annex D (Informative) Chemical composition of steel

連續熱鍍鋅和鋅合金鍍層鋼板及鋼帶 1 范圍 本標準規定了連續熱鍍鋅、鋅鐵合金、鋅鋁合金和鋁鋅合金鍍層鋼板及鋼帶(以下簡稱鋼板及鋼帶)的術語和定義、分類、代號及牌號表示方法、訂貨內容、尺寸、外形、重量、技術要求、試驗方法、檢驗規則、包裝、標志及質量證明書。 本標準適用于汽車、建筑、家電等行業用厚度為0.20 mm～6.0 mm的鋼板及鋼帶。 2 規范性引用文件 下列文件對于本文件的應用是必不可少的。凡是注日期的引用文件，僅注日期的版本適用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改單)適用于本文件。 GB／T 223.5 鋼鐵 酸溶硅和全硅含量的測定 還原型硅鉬酸鹽分光光度法 GB／T 223.9 鋼鐵及合金 鋁含量的測定 鉻天青S分光光度法 GB／T 223.12 鋼鐵及合金化學分析方法 碳酸鈉分離-二苯酸銑二肼光度法測定鉻量 GB／T 223.14 鋼鐵及合金化學分析方法 鉭試劑萃取光度法測定釩量 GB／T 223.17 鋼鐵及合金化學分析方法 二安替比林甲烷光度法測定鈦量 GB／T 223.26 鋼鐵及合金 鉬含量的測定 硫氰酸鹽分光光度法 GB／T 223.40 鋼鐵及合金 鈮含量的測定 氯磺酚S分光光度法 GB／T 223.59 鋼鐵及合金 磷含量的測定 鉍磷鉬藍分光光度法和銻磷鉬藍分 GB／T 223.60 鋼鐵及合金化學分析方法 高氯酸脫水重量法測定硅含量 GB／T 223.63 鋼鐵及合金化學分析方法 高碘酸鈉(鉀)光度法測定錳量 GB／T 223.64 鋼鐵及合金 錳含量的測定 火焰原子吸收光譜法 GB／T 223.78 鋼鐵及合金化學分析方法 姜黃素直接光度法測定硼含量 GB／T 228.1—2010 金屬材料 拉伸試驗 第1部分：室溫試驗方法 GB／T 247 鋼板和鋼帶包裝、標志及質量證明書的一般規定 GB／T 1839—2008 鋼產品鍍鋅層質量試驗方法 GB／T 2975 鋼及鋼產品 力學性能試驗取樣位置及試樣制備 GB／T 4336 碳素鋼和中低合金鋼 多元素含量的測定 火花放電原子發射光譜法(常規法) GB／T 5027 金屬材料 薄板和薄帶 塑性應變比(r值)的測定 GB／T 5028 金屬材料 薄板和薄帶 拉伸應變硬化指數(n值)的測定 GB／T 8170 數值修約規則與極限數值的表示和判定 GB／T 17505 鋼及鋼產品 交貨一般技術要求 GB／T 20066 鋼和鐵 化學成分測定用試樣的取樣和制樣方法 GB／T 20123 鋼鐵 總碳硫含量的測定 高頻感應爐燃燒后紅外吸收法(常規方法) GB／T 20125 低合金鋼 多元素含量的測定 電感耦合等離子體原子發射光譜法 GB／T 20126 非合金鋼 低碳含量的測定 第2部分：感應爐(經預加熱)內燃燒后紅外吸收法 GB／T 24174 鋼 烘烤硬化值(BH2)的測定方法 GB／T 25052—2010 連續熱浸鍍層鋼板和鋼帶尺寸、外形、重量及允許偏差 ISO 6892-1：2016 金屬材料 拉伸試驗 第1部分：室溫試驗方法(Metallic materials-Tensile testing-Part 1：Method of test at room temperature) 3 術語和定義 下列術語和定義適用于本文件。 3.1 熱鍍純鋅鍍層 hot-dip zinc coating 連續熱鍍鋅生產線上，將經過預處理的鋼帶浸入熔融鋅液中所得到的純鋅鍍層。 注：熔融鋅液中鋅含量不小于99％。 3.2 熱鍍鋅鐵合金鍍層 hot-dip zinc-iron alloy coating 連續熱鍍鋅生產線上，將經過預處理的鋼帶浸入熔融鋅液中所得到的鋅鐵合金鍍層。 注：熔融鋅液中鋅含量不小于99％。通過合金化處理工藝在整個鍍層上形成鋅鐵合金層，合金鍍層中鐵含量通常為8％～15％。 3.3 熱鍍鋅鋁合金鍍層 hot-dip zinc-aluminum alloy coating 連續熱鍍鋅鋁生產線上，將經過預處理的鋼帶浸入熔融鋅鋁合金溶液中所得到的鍍層。 注：熔融鋅鋁合金溶液中鋁的質量分數約為5％，含有少量稀土，其余成分為鋅。 3.4 熱鍍鋁鋅合金鍍層 hot-dip aluminum-zinc alloy coating 連續熱鍍鋁鋅生產線上，將經過預處理的鋼帶浸入熔融鋁鋅合金溶液中所得到的鍍層。 注：熔融鋁鋅合金溶液中鋁的質量分數約為55％，硅的質量分數約為1.6％，其余成分為鋅。 3.5 無間隙原子鋼 interstitial free steel 在超低碳鋼中加入適量的鈦或鈮，使鋼中的碳、氮間隙原子完全被固定成碳、氮化物，鋼中沒有間隙原子存在的一類鋼。 3.6 高強度無間隙原子鋼 high strength interstitial free steel 通過在無間隙原子鋼中添加一定量的磷、錳、硅等強化元素，使具有較高強度且能保持良好的成形性能的鋼。 3.7 烘烤硬化鋼 bake hardening steel 保留一定量的固溶碳、氮原子，同時可通過添加磷、錳等強化元素來提高強度，加工成形并在一定溫度下烘烤后，由于時效硬化使屈服強度進—步升高的一類鋼。 3.8 低合金鋼 low alloy steel 在低碳鋼中，通過單—或復合添加鈮、鈦、釩等微合金元素，形成碳氮化合物粒子，析出進行強化，同時，通過微合金元素的細化晶粒作用以獲得較高的強度的鋼。 3.9 雙相鋼 dual phase steel 顯微組織主要為鐵素體和馬氏體，也可能會有部分貝氏體組織的鋼。 注：雙相鋼不僅具有較高的抗拉強度水平，而且具有較低的屈強比和較高的加工硬化率。 3.10 相變誘導塑性鋼 transformation induced plasticity steel 顯微組織為鐵素體、貝氏體和殘余奧氏體，在成形過程中，殘余奧氏體可轉變為馬氏體組織的鋼。 注：具有較高的加工硬化率、均勻伸長率和抗拉強度。與同等抗拉強度的雙相鋼水平相比，具有更高的延伸率。 3.11 復相鋼 complex phase steel 顯微組織是鐵素體或貝氏體基體上分布少量馬氏體、殘余奧氏體或珠光體，通過微合金元素細晶強化或析出強化的鋼。 注：與同等抗拉強度的雙相鋼相比，具有較高的屈服強度和良好彎曲性能。 3.12 增強成形性雙相鋼 dual phase steel with high formability 顯微組織主要為鐵素體、馬氏體以及少量貝氏體或殘余奧氏體的鋼。 注：與同等抗拉強度的雙相鋼相比，具有更高的斷后伸長率和加工硬化指數。適用于具有較高拉延需求的零件成形。 3.13 拉伸應變痕 stretcher strain marks 冷加工成形時，由于時效的原因導致鋼板或鋼帶表面出現的滑移線、橘子皮等有損表面外觀的缺陷。 3.14 鍍層重量 coating mass 雙面鍍層的重量之和。 注：單位為克每平方米(g／m2)。 4 牌號表示方法及分類和代號 4.1 牌號表示方法 4.1.1 總則 鋼板及鋼帶的牌號由產品用途代號、鋼級代號(或序列號)、鋼種特性(如有)、熱鍍代號(D)和鍍層種類代號五部分構成，其中熱鍍代號(D)和鍍層種類代號之間用加號“＋”連接。 4.1.2 用途代號 用途代號如下： a) DX：第一位字母D表示冷成形用扁平鋼材；第二位字母如果為X，代表基板的軋制狀態不規定；第二位字母如果為C，則代表基板規定為冷軋基板；第二位字母如果為D，則代表基板規定為熱軋基板。 b) S：表示為結構用鋼。 c) HX：第一位字母H代表冷成形用高強度扁平鋼材；第二位字母如果為X，代表基板的軋制狀態不規定；第二位字母如果為C，則代表基板規定為冷軋基板；第二位字母如果為D，則代表基板規定為熱軋基板。 4.1.3 鋼級代號(或序列號) 鋼級代號如下： a) 51～57：2位數字，用以代表鋼級序列號； b) 180～1180：3位～4位數字，用以代表鋼級代號；根據牌號命名方法的不同，一般為規定的最小屈服強度或最小屈服強度和最小抗拉強度，單位為兆帕(MPa)。 4.1.4 鋼種特性 鋼種特性通常用1位～2位字母表示，特性代號如下： a) Y表示鋼種類型為高強度無間隙原子鋼； b) LA表示鋼種類型為低合金鋼； c) B表示鋼種類型為烘烤硬化鋼； d) DP表示鋼種類型為雙相鋼； e) TR表示鋼種類型為相變誘導塑性鋼； f) CP表示鋼種類型為復相鋼； g) DH表示鋼種類型為增強成形性雙相鋼； h) G表示鋼種特性不規定。 4.1.5 熱鍍代號 熱鍍代號表示為D。 4.1.6 鍍層代號 純鋅鍍層表示為Z，鋅鐵合金鍍層表示為ZF，鋅鋁合金鍍層表示為ZA，鋁鋅合金鍍層表示為AZ。 4.2 牌號示例 示例1 DC57D＋ZF 表示產品用途為冷成形用扁平鋼材，規定基板為冷軋基板，鋼級序列號為57，鋅鐵合金鍍層熱鍍產品。 示例2 S350GD＋Z 表示產品用途為結構用，規定的最小屈服強度值為350MPa，鋼種特性不規定，純鋅鍍層熱鍍產品。 示例3 HX340LAD＋ZF 表示產品用途為冷成形用高強度扁平鋼材，不規定基板狀態，規定的最小屈服強度值為340MPa，鋼種類型為低合金鋼，鋅鐵合金鍍層熱鍍產品。 示例4 HC330／590DPD＋Z 表示產品用途為冷成形用高強度扁平鋼材，規定基板為冷軋基板，規定的最小屈服強度值為330MPa，規定的最小抗拉強度值為590 MPa，鋼種類型為雙相鋼，純鋅鍍層熱鍍產品。 4.3 牌號及鋼種特性 4.3.1 鋼板及鋼帶的牌號及鋼種特性應符合表1的規定。