GB/T 15675-2008 in English

《GB/T 15675-2008连续电镀锌、锌镍合金镀层钢板及钢带》由TC183（全国钢标准化技术委员会）归口，主管部门为中国钢铁工业协会。
本标准代替GB/T 15675-1995 《连续电镀锌冷轧钢板及钢带》。
本标准规定了连续电镀锌、锌镍合金镀层钢板及钢带的术语和定义、分类和代号、尺寸、外形、重量、技术要求、检验和试验、包装、标志和质量证明书等要求。
本标准适用于汽车、家电、电子等行业使用的电镀锌、锌镍合金镀层钢板及钢带。
本标准与GB/T 15675-1995 相比，对下列主要技术内容进行了修改：
―――标准名称修改为《连续电镀锌、锌镍合金镀层钢板及钢带》；
―――范围中增加了锌镍合金镀层的钢板及钢带；
―――新增了烘烤硬化钢、高强度无间隙原子钢和双相钢等基板的电镀产品；
―――新增了锌镍合金镀层、耐指纹处理的定义；
―――修改了牌号命名方式；
―――根据实际情况，将表面质量的要求区分为三种级别；
―――新增了无铬的环保表面处理方式；
―――成分和性能直接参考基板要求，并根据镀层重量不同，对锌镍镀层的钢板性能进行适当调整；
―――修改了镀层粘附性的规定；
―――修改了镀层重量的要求，并规定了单面单点值要求；
―――对于钢带状态交货的产品，其表面有缺陷的部分的长度由8%调整为6%。

1 Scope
This standard specifies requirements of terms and definitions, classification and code, dimension, appearance, weight, technical specifications, inspection and test, package, mark and certification of continuously electrolytically zinc/zinc-nickel alloy steel sheet and strip (hereinafter referred to as steel sheet and strip).
This standard is applicable to electrolytically zinc/zinc-nickel alloy steel sheets and strips used in automobile, home appliances, and electron industries, etc.

2 Normative References
The following standards contain provisions which, through reference in this standard ,constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 247 General provisions of Acceptance, Package, Mark and Certification for Steel sheets (Sheets) and Strips.
GB/T 708 Dimension, Shape, Weight and Tolerance for Cold-rolled Steel sheets and Sheets"
GB/T 1839 Test method for gravimetric determination of the mass per unit area of galvanized coatings of steel products.
GB/T 5213 Cold rolled carbon steel sheet and strip
GB/T 8170 Rules for Rounding off of Numberical Values
GB/T 17505 Steel and Steel Products: General Technical Delivery Requirements (GB/T 17505-1998, eqv ISO 404: 1992)
GB/T 20564.1 Continuously cold rolled high strength steel sheet and strip for automobile - Part 1: Bake hardening steel
GB/T 20564.2 Continuously cold rolled steel sheet and strip for automobile - Part 2: dual phase steel
GB/T 20564.3 Continuously cold rolled high strength steel sheet and strip for automobile - Part 3: High strength interstitial free steel

3 Terms and Definitions
The following terms and definitions are applicable to this standard.
3.1 Electrolytic Zinc Coating(ZE)
Coating produced by galvanography through production line of continuously electrolytically zinc and constituted by pure zinc; coating is free from any minor element harmful to the binding force or painting performance of binder.

3.2 Electrolytic Zinc-Nickel Coating (ZN)
Coating produced by galvanography through production line of continuously electrolytically zinc and constituted by pure zinc; the mass fraction range of nickel in coating is around 8%~15%, and the rest compositions are zinc.

3.3 Anti-Fingerprint Treatment
Carry out passivation to the surface of steel sheet and strip, and coat anti-fingerprint film to improve the stain–resistance of electronic or electric products.