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Standard For Inspection Of Galvanized Steel Coils
- Nov 04, 2017 -

The quality request of the fine grade galvanized sheet includes dimensions, surface, galvanizing quantity, chemical composition, flatness, machine function and packing.

1. Packaging
Divided into a fixed length of galvanized plate and coil galvanized sheet packaging two kinds. General metal packaging, lined with moisture-proof paper, outside of the iron kidney tie, tied firmly, in case of internal galvanized plate rubbing.

2. Specification size
The scale thickness, length and width of galvanized plate and its allowable defects are listed in the product scale (as described below). Otherwise, the width and length of the board, and the width of the volume can be determined by the user's request.

3. Surface
General situation: galvanized sheet because of the treatment of coating process differences, general situation also differences, such as ordinary zinc flower, zinc flower, flat zinc flower, zinc-free flower and the general situation of phosphating treatment. Cut the length of the galvanized sheet and galvanized coil should not have the disadvantage of the use of the impact (the following amplify), but the volume plate allows the welding site, such as the number of non-deformed departments.

4. Galvanized Quantity
Galvanized Scale Value: Zinc plating is a useful way to indicate the thickness of zinc coating. There are two sides of the same galvanized volume (that is, such as thick galvanized) and galvanized on both sides of the difference (that is, thick galvanized). The zinc-plated unit is g/㎡.

5. Machine function
(1) Tensile test: Generally speaking, as long as the layout, La and deep drawing with galvanized plate has a tensile function request.
(2) Bending experiment: It is the important denomination to weigh the process function of sheet metal. However, the scale of the various types of galvanized plate request is actually different. General request galvanized Sheet bending 180°, the external profile must not have the zinc layer to leave, the plate base shall not have cracks and fracture.

6. Chemical composition
For the chemical composition of galvanized substrates, the scale of the nations is divided. Generally do not make product inspection.

7. Flatness
Weigh the shape of black and white with two goals, i.e. straightness and sickle bend. The flatness of the plate and the maximum allowable value of the sickle bend must be delineated.