1. Unwinding welding
Uncoiling: Stop uncoiling the coil and provide the strip needed for continuous operation. Two uncoilers are usually used.
Welding: Stop welding the tail of the front strip and the head of the back strip to ensure the continuous consumption of the unit.
2. Degreasing and cleaning
Cleaning section is to stop cleaning the appearance of strip steel, remove rolling oil and iron powder, in order to obtain good coating adhesion and appearance quality. Generally, cleaning section includes spraying, brushing, electrolytic cleaning, brushing, spraying, extrusion drying and hot air drying equipment. Cleaning section is comparatively important for hot galvanizing and is an important step to achieve good surface quality of strip steel.
The annealing furnace is usually composed of preheating, heating, soaking and cooling sections.
4. Zinc plating (aluminium)
Galvanizing: stop immersion galvanizing or other metallic zinc coating on strip steel。 One or more zinc pots can be set up according to the type of production。
Air Knife Zinc Layer Control: Air is injected into the strip surface after the air knife comes out of the zinc pot, usually air or pure nitrogen, to control the thickness of the coating on the strip surface.
Alloying disposal: The process of obtaining new ferroalloy zinc layer by stopping heating the galvanized strip, usually including heating, heat preservation and cooling.
Air cooling after plating: Air injection is used to stop cooling the galvanized strip to ensure that the coating is cooled when entering the top roll.
Water quenching cooling: further cooling of the strip after plating to ensure that the temperature of the strip before leveling meets the process requirements.
6. Flat stretching and straightening
Flatness: Stop rolling of small rolling force on strip, eliminate the yield platform of low carbon steel, improve the performance of strip, achieve the desired surface roughness of strip, improve the shape of strip, achieve good flatness, etc。
Straightening: Strip steel stop stretching and straightening, and further improve the shape of the plate.
7。 post disposal
To stop passivation or other chemical surface treatment of strip steel in order to obtain desired corrosion resistance, smoothness or other requirements, spray extrusion drying or roll coating drying is generally used.
According to the requirement, the strip is stopped trimming in order to obtain the appropriate width accuracy.
The strip steel is stopped oiling to obtain certain anti-rust and smooth properties.
The strip is coiled into a coil or sheet.
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