Galvannealed coil, this kind of steel plate is also made by hot dip method, but it is heated to about 500℃ immediately after coming out of the tank, so that it can form an alloy film of zinc and iron. This kind of galvanized coil has good paint adhesion and weldability.
Galvannealed coil coating classification
(1)Normal spangle coating
During the normal solidification process of the zinc layer, the zinc grains grow freely to form a coating with obvious zinc flower morphology.
(2)minimized spangle coating
During the solidification process of the zinc layer, the zinc grains are artificially restricted to form the tiniest possible zinc flower coating.
(3)Spangle-free coating
By adjusting the chemical composition of the plating solution, a coating with a uniform surface without visible spangles is obtained.
(4) zinc-iron alloy coating zinc-iron alloy coating
The steel strip after passing through the galvanizing bath is heat treated so that the entire coating forms an alloy layer of zinc and iron. This coating has a dark gray appearance with no metallic luster and is easily powdered during the intense forming process. It is suitable for use in addition to general A coating that can be painted directly without further processing other than cleaning.
(5) Differential coating differential coating
For both sides of galvanized steel sheets, coatings with different zinc layer weights are required.
(6)Skin pass
Finishing is a cold rolling process with slight deformation on galvanized steel sheets for one or more of the following purposes.
Improve the surface appearance of galvannealed coil or be suitable for decorative coating; temporarily minimize the slip lines (Lüders lines) or creases produced during processing of the finished product, etc.
GNEE STEEL galvannealed coil is divided into cold-rolled base plate galvanized and hot-rolled base plate galvanized.
Produced by continuous galvanizing of cold-rolled or hot-rolled steel for general use or structural use. The general scope of supply of Galvannealed coil: Thickness (0.3-3.5) Width (800-1830) Length (plate 1000-6000, coil inner diameter 610) unit mm
The thickness of cold-rolled galvanizing is generally less than 1.5MM (for example: the grade is ST01Z), the thickness of hot-rolled substrate galvanizing is 1.5MM, and the thickness is generally no more than 4.0MM. (Example: The grade is ST01ZR).
Note: (The grades using hot-rolled plates as base plates are ST01ZR, ST02ZR, HSA340ZR, and HSA410ZR)
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