镀锌板质量检验标准

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优质镀锌板的质量要求包括规格尺寸、表面、锌含量、化学成分、板形、机械性能和包装。
1包装
它可分为两种：镀锌板定尺切割和镀锌带包装。一般情况下，铁皮包装内衬防潮纸，外部用铁皮腰扎起来，防止内部镀锌板之间的摩擦。
2规格和尺寸
有关产品的刻度（如下面和）列出了推荐的镀锌板厚度、长度和宽度及其允许缺陷。另外，还可以根据用户要求确定板的宽度和长度以及卷的宽度。
三。表面
概况：由于镀锌板涂装过程中的处理方法不同，一般情况也不同，如普通锌、细锌、扁锌、无锌、磷化等。切定长度的镀锌板和镀锌线圈不得有影响使用的缺陷（如下所述），但允许卷盘上有焊接件和其他不变形的零件。
4镀锌量
镀锌量标度值：镀锌量是表示镀锌板镀锌层厚度的一种广泛采用和有用的方法。两侧有两种相同的镀锌量（即等厚镀锌）和不同的镀锌量（即差厚镀锌）。镀锌量单位为g/m2。
5机器功能
（1） 拉伸试验：一般来说，只要布置、拉深和拉深镀锌板都有拉伸功能要求。
（2） 弯曲试验：是衡量薄板工艺性能的重要项目。然而，不同国家对不同类型镀锌板的要求不同。一般要求镀锌板弯曲180年后，其外部不得有锌层残留，板底应无裂纹和断裂。
6化学成分
对于镀锌层化学成分的要求，不同国家有不同的标准。如果日本不要求，美国也会。一般不需要产品检验。
7板形
衡量黑白的形状有两个目标，即直线度和镰刀弯曲度。确定了钢板的直线度和镰刀形弯曲的最大允许值。

The quality requirements of good grade galvanized sheet include specifications and dimensions, surface, zinc content, chemical composition, plate shape, machine function and packaging.

1. Packaging
It can be divided into two kinds: galvanized sheet cut into fixed length and galvanized strip package. Generally, iron sheet packing is lined with moisture-proof paper, and the outer part is tied with iron waist to prevent friction between galvanized sheets inside.
2. Specifications and dimensions
The scale of the product concerned (e.g. below and) lists the recommended gauge thickness, length and width of galvanized sheet and its allowable defects. In addition, the width and length of the board and the width of the roll can also be determined according to the user's request.
3. Surface
General situation: due to different treatment methods in the coating process of galvanized sheet, the general situation is also different, such as the general situation of common zinc, fine zinc, flat zinc, no zinc and phosphating. The galvanized sheet and galvanized coil cut into fixed length shall not have defects that affect the use (as described below), but the coil plate is allowed to have welding parts and other parts which are not deformed.
4. Galvanizing amount
Galvanizing quantity scale value: galvanizing amount is a widely adopted and useful method to indicate zinc coating thickness of galvanized sheet. There are two kinds of same galvanizing amount on both sides (i.e. equal thickness galvanizing) and different zinc plating amount (i.e. differential thickness galvanizing) on both sides. The unit of galvanizing amount is g / m2.
5. Machine function
(1) Tensile test: Generally speaking, as long as layout, drawing and deep drawing galvanized sheet have tensile function request.
(2) Bending experiment: it is an important item to weigh the technological function of thin plate. However, the requirements for various types of galvanized sheet are different in different countries. Generally, it is required that after the galvanized sheet is bent for 180 years, there shall be no zinc layer left on the outside, and the plate base shall be free from cracking and fracture.
6. Chemical composition
For the request of chemical composition of galvanized substrate, different countries have different standards. If Japan does not request, the United States does. Generally, no product inspection is required.
7. Plate shape
There are two goals to weigh the shape of black and white, namely straightness and sickle bend. The maximum allowable values of straightness and sickle bend of plates are defined.