Wuhan SiWeiZhongcheng Technology Co.. Ltd
Composite Deck
Cold-Rolled Thin Steel Sheet is the abbreviated term for cold-rolled sheets made of plain carbon structural steel. It is also referred to as cold-rolled sheet and commonly known as cold plate.
Cold rolling primarily uses low-carbon steel grades, with hot-rolled steel as the raw material. The final product is formed through a series of processes, including pickling to remove scale, cold rolling, annealing, coating/plating, and finishing. Compared to hot-rolled sheets, cold-rolled sheets exhibit superior surface quality, higher dimensional accuracy, and—owing to the annealing treatment—excellent mechanical properties. These include higher strength, lower yield limit, good ductility, and deep-drawing formability. Both the mechanical and processing properties of cold-rolled sheets surpass those of hot-rolled thin steel sheets. In many fields, particularly home appliance manufacturing, they are increasingly replacing hot-rolled thin steel sheets.
Cold-rolled sheets have a wide range of applications, including automobile manufacturing, electrical products, railway vehicles, aviation, precision instruments, and food cans.
Cold-rolled products include: cold-rolled sheets, coated/plated sheets, and silicon steel sheets.
The annealing of cold-rolled sheets is primarily conducted through two methods: batch annealing and continuous annealing.
Batch Annealing:
This method involves placing several steel coils together inside a bell-type furnace, where they simultaneously undergo heating, soaking, and cooling. Subsequent processes, such as leveling, are performed outside the furnace.
Advantages: High flexibility in adapting to changes in product specifications and output volume.
Disadvantages: Long production cycle, low efficiency, limited product variety, relatively poor surface quality, and inferior consistency (uniformity) of properties within the same coil.
Continuous Annealing:
In this process, the steel coil is uncoiled, welded, and then continuously passed through stages including cleaning, heating, cooling, leveling, and oiling.
Advantages: Short production cycle, high efficiency, wide product variety, good surface quality, and excellent consistency (uniformity) of properties within the same coil.
Disadvantages: Low flexibility in adapting to changes in product specifications and output volume.
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