标准编号:	GB/T 2518-2019
中文名称:	连续热镀锌和锌合金镀层钢板及钢带
英文名称:	Continuously hot-dip zinc and zinc alloy coated steel sheet and strip
中标分类:	H46    钢板、钢带
行业分类:	GB    国家标准
ICS分类:	77.140.50 77.140.50    扁平钢和半成品 77.140.50
发布机构:	中华人民共和国国家市场监督管理总局 中国国家标准化管理委员会
发布日期:	2019-12-10
实施日期:	2020-7-1
标准状态:	valid
替代旧标准:	GB/T 2518-2008 连续热镀锌钢板及钢带 GB/T 14978-2008 连续热镀铝锌合金镀层钢板及钢带
翻译语言:	英文
文件格式:	PDF
中文字符数:	30000 字
翻译价格(元):	1300.0
交付时间:	付款后 1 个工作日

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

连续热镀锌和锌合金镀层钢板及钢带 1 范围 本标准规定了连续热镀锌、锌铁合金、锌铝合金和铝锌合金镀层钢板及钢带(以下简称钢板及钢带)的术语和定义、分类、代号及牌号表示方法、订货内容、尺寸、外形、重量、技术要求、试验方法、检验规则、包装、标志及质量证明书。 本标准适用于汽车、建筑、家电等行业用厚度为0.20 mm～6.0 mm的钢板及钢带。 2 规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。 GB／T 223.5 钢铁 酸溶硅和全硅含量的测定 还原型硅钼酸盐分光光度法 GB／T 223.9 钢铁及合金 铝含量的测定 铬天青S分光光度法 GB／T 223.12 钢铁及合金化学分析方法 碳酸钠分离-二苯酸铣二肼光度法测定铬量 GB／T 223.14 钢铁及合金化学分析方法 钽试剂萃取光度法测定钒量 GB／T 223.17 钢铁及合金化学分析方法 二安替比林甲烷光度法测定钛量 GB／T 223.26 钢铁及合金 钼含量的测定 硫氰酸盐分光光度法 GB／T 223.40 钢铁及合金 铌含量的测定 氯磺酚S分光光度法 GB／T 223.59 钢铁及合金 磷含量的测定 铋磷钼蓝分光光度法和锑磷钼蓝分 GB／T 223.60 钢铁及合金化学分析方法 高氯酸脱水重量法测定硅含量 GB／T 223.63 钢铁及合金化学分析方法 高碘酸钠(钾)光度法测定锰量 GB／T 223.64 钢铁及合金 锰含量的测定 火焰原子吸收光谱法 GB／T 223.78 钢铁及合金化学分析方法 姜黄素直接光度法测定硼含量 GB／T 228.1—2010 金属材料 拉伸试验 第1部分：室温试验方法 GB／T 247 钢板和钢带包装、标志及质量证明书的一般规定 GB／T 1839—2008 钢产品镀锌层质量试验方法 GB／T 2975 钢及钢产品 力学性能试验取样位置及试样制备 GB／T 4336 碳素钢和中低合金钢 多元素含量的测定 火花放电原子发射光谱法(常规法) GB／T 5027 金属材料 薄板和薄带 塑性应变比(r值)的测定 GB／T 5028 金属材料 薄板和薄带 拉伸应变硬化指数(n值)的测定 GB／T 8170 数值修约规则与极限数值的表示和判定 GB／T 17505 钢及钢产品 交货一般技术要求 GB／T 20066 钢和铁 化学成分测定用试样的取样和制样方法 GB／T 20123 钢铁 总碳硫含量的测定 高频感应炉燃烧后红外吸收法(常规方法) GB／T 20125 低合金钢 多元素含量的测定 电感耦合等离子体原子发射光谱法 GB／T 20126 非合金钢 低碳含量的测定 第2部分：感应炉(经预加热)内燃烧后红外吸收法 GB／T 24174 钢 烘烤硬化值(BH2)的测定方法 GB／T 25052—2010 连续热浸镀层钢板和钢带尺寸、外形、重量及允许偏差 ISO 6892-1：2016 金属材料 拉伸试验 第1部分：室温试验方法(Metallic materials-Tensile testing-Part 1：Method of test at room temperature) 3 术语和定义 下列术语和定义适用于本文件。 3.1 热镀纯锌镀层 hot-dip zinc coating 连续热镀锌生产线上，将经过预处理的钢带浸入熔融锌液中所得到的纯锌镀层。 注：熔融锌液中锌含量不小于99％。 3.2 热镀锌铁合金镀层 hot-dip zinc-iron alloy coating 连续热镀锌生产线上，将经过预处理的钢带浸入熔融锌液中所得到的锌铁合金镀层。 注：熔融锌液中锌含量不小于99％。通过合金化处理工艺在整个镀层上形成锌铁合金层，合金镀层中铁含量通常为8％～15％。 3.3 热镀锌铝合金镀层 hot-dip zinc-aluminum alloy coating 连续热镀锌铝生产线上，将经过预处理的钢带浸入熔融锌铝合金溶液中所得到的镀层。 注：熔融锌铝合金溶液中铝的质量分数约为5％，含有少量稀土，其余成分为锌。 3.4 热镀铝锌合金镀层 hot-dip aluminum-zinc alloy coating 连续热镀铝锌生产线上，将经过预处理的钢带浸入熔融铝锌合金溶液中所得到的镀层。 注：熔融铝锌合金溶液中铝的质量分数约为55％，硅的质量分数约为1.6％，其余成分为锌。 3.5 无间隙原子钢 interstitial free steel 在超低碳钢中加入适量的钛或铌，使钢中的碳、氮间隙原子完全被固定成碳、氮化物，钢中没有间隙原子存在的一类钢。 3.6 高强度无间隙原子钢 high strength interstitial free steel 通过在无间隙原子钢中添加一定量的磷、锰、硅等强化元素，使具有较高强度且能保持良好的成形性能的钢。 3.7 烘烤硬化钢 bake hardening steel 保留一定量的固溶碳、氮原子，同时可通过添加磷、锰等强化元素来提高强度，加工成形并在一定温度下烘烤后，由于时效硬化使屈服强度进—步升高的一类钢。 3.8 低合金钢 low alloy steel 在低碳钢中，通过单—或复合添加铌、钛、钒等微合金元素，形成碳氮化合物粒子，析出进行强化，同时，通过微合金元素的细化晶粒作用以获得较高的强度的钢。 3.9 双相钢 dual phase steel 显微组织主要为铁素体和马氏体，也可能会有部分贝氏体组织的钢。 注：双相钢不仅具有较高的抗拉强度水平，而且具有较低的屈强比和较高的加工硬化率。 3.10 相变诱导塑性钢 transformation induced plasticity steel 显微组织为铁素体、贝氏体和残余奥氏体，在成形过程中，残余奥氏体可转变为马氏体组织的钢。 注：具有较高的加工硬化率、均匀伸长率和抗拉强度。与同等抗拉强度的双相钢水平相比，具有更高的延伸率。 3.11 复相钢 complex phase steel 显微组织是铁素体或贝氏体基体上分布少量马氏体、残余奥氏体或珠光体，通过微合金元素细晶强化或析出强化的钢。 注：与同等抗拉强度的双相钢相比，具有较高的屈服强度和良好弯曲性能。 3.12 增强成形性双相钢 dual phase steel with high formability 显微组织主要为铁素体、马氏体以及少量贝氏体或残余奥氏体的钢。 注：与同等抗拉强度的双相钢相比，具有更高的断后伸长率和加工硬化指数。适用于具有较高拉延需求的零件成形。 3.13 拉伸应变痕 stretcher strain marks 冷加工成形时，由于时效的原因导致钢板或钢带表面出现的滑移线、橘子皮等有损表面外观的缺陷。 3.14 镀层重量 coating mass 双面镀层的重量之和。 注：单位为克每平方米(g／m2)。 4 牌号表示方法及分类和代号 4.1 牌号表示方法 4.1.1 总则 钢板及钢带的牌号由产品用途代号、钢级代号(或序列号)、钢种特性(如有)、热镀代号(D)和镀层种类代号五部分构成，其中热镀代号(D)和镀层种类代号之间用加号“＋”连接。 4.1.2 用途代号 用途代号如下： a) DX：第一位字母D表示冷成形用扁平钢材；第二位字母如果为X，代表基板的轧制状态不规定；第二位字母如果为C，则代表基板规定为冷轧基板；第二位字母如果为D，则代表基板规定为热轧基板。 b) S：表示为结构用钢。 c) HX：第一位字母H代表冷成形用高强度扁平钢材；第二位字母如果为X，代表基板的轧制状态不规定；第二位字母如果为C，则代表基板规定为冷轧基板；第二位字母如果为D，则代表基板规定为热轧基板。 4.1.3 钢级代号(或序列号) 钢级代号如下： a) 51～57：2位数字，用以代表钢级序列号； b) 180～1180：3位～4位数字，用以代表钢级代号；根据牌号命名方法的不同，一般为规定的最小屈服强度或最小屈服强度和最小抗拉强度，单位为兆帕(MPa)。 4.1.4 钢种特性 钢种特性通常用1位～2位字母表示，特性代号如下： a) Y表示钢种类型为高强度无间隙原子钢； b) LA表示钢种类型为低合金钢； c) B表示钢种类型为烘烤硬化钢； d) DP表示钢种类型为双相钢； e) TR表示钢种类型为相变诱导塑性钢； f) CP表示钢种类型为复相钢； g) DH表示钢种类型为增强成形性双相钢； h) G表示钢种特性不规定。 4.1.5 热镀代号 热镀代号表示为D。 4.1.6 镀层代号 纯锌镀层表示为Z，锌铁合金镀层表示为ZF，锌铝合金镀层表示为ZA，铝锌合金镀层表示为AZ。 4.2 牌号示例 示例1 DC57D＋ZF 表示产品用途为冷成形用扁平钢材，规定基板为冷轧基板，钢级序列号为57，锌铁合金镀层热镀产品。 示例2 S350GD＋Z 表示产品用途为结构用，规定的最小屈服强度值为350MPa，钢种特性不规定，纯锌镀层热镀产品。 示例3 HX340LAD＋ZF 表示产品用途为冷成形用高强度扁平钢材，不规定基板状态，规定的最小屈服强度值为340MPa，钢种类型为低合金钢，锌铁合金镀层热镀产品。 示例4 HC330／590DPD＋Z 表示产品用途为冷成形用高强度扁平钢材，规定基板为冷轧基板，规定的最小屈服强度值为330MPa，规定的最小抗拉强度值为590 MPa，钢种类型为双相钢，纯锌镀层热镀产品。 4.3 牌号及钢种特性 4.3.1 钢板及钢带的牌号及钢种特性应符合表1的规定。